Homework Help: Health: Substance Abuse

Recent Homework Questions About Substance Abuse

science
what entropy changes occur whin a substance melts?
Thursday, June 9, 2011 at 7:35pm

med term
In theses 2 scenarios im suppose to find 15 med words and define them, now I have found more then 15 am I correct that there is more then 15? Dont want to know what they are just want to know that there is more then 15 I. AMBULATORY CARE FACE SHEET Admit Date: 7/8/20XX @ 20:22...
Thursday, June 9, 2011 at 4:53pm

physics
A 500.0 g metal block absorbs 1.125 × 104 J of heat to raise its temperature by 50.0 K. What is the substance? Specific Heats of Selected Substances ______________________________________ Substance C [J/(kg•K)] Water (ice-)2,060 Iron-450 Aluminum-897 Gold- 130 ...
Wednesday, June 8, 2011 at 9:56am

TEACHER AIDES
16. Which of the following sets of factors is most influential in contributing to violence? A. Child abuse and poor nutrition B. Persistent poverty and poor nutrition C. Media violence and poor-quality schools D. Persistent poverty and widespread substance abuse . I think its D.
Monday, June 6, 2011 at 8:51pm

Health
What are the short term effects of Cocaine: When someone consumes this substance what effect will it have on their body, mind, and behavior? Please answer ASAP I really need the answer... and please don't give the website for me to find the info, I don't have enough ...
Saturday, June 4, 2011 at 9:47pm

life orientation
substance abuse in (10-15)lines critically discuss 5 ways in which the human or environmental problem impact on the community?
Thursday, June 2, 2011 at 2:37pm

Life Orientation
Institutions/community organizations that are involved in supporting or giving redress to substance abuse.
Monday, May 30, 2011 at 3:00pm

substance
How alcoholism is a human factor that may cause ill health ,accidents,crises or disasters
Monday, May 30, 2011 at 9:31am

chem.
What is an ionic substance made from?
Sunday, May 22, 2011 at 9:06pm

substance drug addiction
A clear explanation of drug addiction how human factor that may cause ill health, accidents, crises or disaster.
Saturday, May 21, 2011 at 4:13pm

chemistry
in 1807 the English chemist Humphrey Davy passed an electric current through molten potassium hydroxide and isolated a bright, shiny reactive substance. He claimed the discovery of a new element, which he names potassium. In those days, before the advent of modern instruments...
Saturday, May 21, 2011 at 3:40pm

chemistry
which substance , glucosa or sodium chloride, will produce more freezing point depreccion whent added to equal amounts of water
Tuesday, May 17, 2011 at 1:15pm

chem
Two hundred grams of a substance requires 0.52 kJ of heat to raise its temperature from 25°C to 45°C. q = mCT. Mass (m) is in grams. Temperature is in degrees Celsius.
Tuesday, May 17, 2011 at 7:08am

chem
draw a titration curve for strong acid that indicates the starting substance had a pH of 1.5 And the base being used to titrate it had a pH of 13.
Monday, May 16, 2011 at 8:48pm

science
whats the physical form in which a substance exists?
Monday, May 16, 2011 at 8:44pm

Drug addiction substance
Human factors that cause ill health.accidents,crises/disaster and an appropriate way to deal with these
Monday, May 16, 2011 at 8:31am

Chem
which substance cannot be decomposed by a chemical change? carbon dioxide, methane, carbon monoxide, or carbon
Wednesday, May 11, 2011 at 3:49pm

Chemistry
Identify the acid or base behavior of each substance in this reaction: H2PO4 + H2O <----> H3O+ + HPO4-
Wednesday, May 11, 2011 at 12:59am

life orientation
substance abuse that cause ill health ,accident,crises and disaster in south africa 5 ways in which the human problem impacts on the environment
Sunday, May 8, 2011 at 2:17pm

maths
The mass of a particular substance is known to grow exponentially at a rate of 0.5% per hour. Its initial mass was 25 grams and, after t hours, it weighed 31 grams. The equation modelling this growth is 25×1.005 t =196; 31. Use the ...
Sunday, May 8, 2011 at 10:34am

Chemistry
If 609.5 grams of vanadium (II) oxide, VO, and 832 grams of iron(III) oxide, Fe2O3, are put into a container and allowed to react according to the equation above, which substance(s) and how many grams of each would be present in the container after the reaction is complete?
Thursday, May 5, 2011 at 10:41am

chemistry
The compound X2C is a very hard substance commonly used to coat metal cutting tools to make them sharper and more resilient. Carbon repersents 3.2% of the compound. what is the element represented by X.
Wednesday, May 4, 2011 at 6:41pm

Chemistry
A student places 5.77 grams of wex (a mythical substance often burned for light on other planets) in a test tube and then melts it. When the wex starts to freeze, the test tube (with the wex) is put into 237.6 g of water at 34.7oC. If the final temperature of the water is 51....
Tuesday, May 3, 2011 at 7:33pm

life orientation
in 15 lines critically discuss 5 ways in which the substance abuse impacts on the community. Provide relevant sources to support your claims.
Tuesday, May 3, 2011 at 4:00pm

Science (Asap)
Compare and contrast: When you combine two or more different substances,you get a mixture.The substance aren't mixed evenly.Their properties don't change.The substance can be separated from the mixture.For example,sand is a mixture that can be separated into rocks and ...
Monday, May 2, 2011 at 7:43pm

English 102
Can someone give me feedback on this please. Introduction Is same-sex marriage going to create issues in our society? Same-sex marriages will most likely produce issues in many political agendas. Religious leadership of Abrahamic faith everywhere will also be confrontational ...
Friday, April 29, 2011 at 7:13pm

Statistics
Among companies doing highway or bridge construction, 80% test employees for substance abuse. A study involves the random selection of 10 such companies. Find the probability that exactly 5 of the 10 companies test for substance abuse.
Wednesday, April 27, 2011 at 12:35pm

allied health part2-19
of the following types of information, which one has the strictest rules regarding the release of informationg? a. substance abuse information b. mental illness information c. genetic information d. adoption information
Wednesday, April 13, 2011 at 7:15pm

allied health part 2-17
if an institutional review board is involved in a request for information, the information is likely sought by a a. health care facility b. researcher c. court d. substance abuse center
Wednesday, April 13, 2011 at 7:14pm

physics
Lead is a very dense substance. 12 cm^3 of lead has a mass of 136.8g. Wgat is the density of the lead?
Monday, April 11, 2011 at 10:12am

Calculus
In a chemical reaction, substance A combines with substance B to form subtance Y. At the start of the reaction, the quantity of A present is a grams, and the quantity of B present is b grams. Assume a is less than b. At time t seconds after the start of the reaction, the ...
Sunday, April 10, 2011 at 7:00pm

chemistry
iron+sulphur together are a mixture of small grains yellow and dark grey.Its chemical symbol is 'Fe + S'.When it reacts with oxygen they create a new chemical substance; Iron Sulphide. What do you put for 'explain the reaction using the Big Idea of Energy? :S HELP xxx
Sunday, April 10, 2011 at 3:20pm

Physics
Calculate the net charge on a substance con- sisting of a combination of 3.5 × 1013 protons and 6.3 × 1013 electrons. Answer in units of C.
Friday, April 8, 2011 at 7:38pm

math
The decay of 333 mg of a radioactive substance is given by A(t) = 333e-0.024t, where t is time in years. Find the amount left after 17 years.
Friday, April 8, 2011 at 7:17pm

Math
the concentration of a certain substance in our organism is given by the model Q9t) = Q(subscript 0) e^-0.1960t a) what quantity of substance is present in the organism of this individual 3 hours after ingestion? b) after how many hours will there only be 10% of this substance...
Thursday, April 7, 2011 at 12:51am

English
Select the answer that contains the correct punctuation for the following sentence. A diamond is the hardest natural substance it can scratch any other stone. A. The sentence is correct. B. ... substance, it can... C. ... substance; it can... D. ... substance; and, it can... I...
Wednesday, April 6, 2011 at 5:51pm

physics
calculate the net charge on a substance consisting of a combination of 2.6e13 protons and 6.0e13 electrons. answer in units of C.
Wednesday, April 6, 2011 at 4:55pm

science
if we mix 2 substance A and B of 30 degrees celsius and 70 degrees celsius respectively.what will be the temp of the mixture
Wednesday, April 6, 2011 at 12:50pm

chemistry
What substance is produced at the cathode during the electrolysis of molten calcium bromide, CaBr2? Assume standard conditions.
Tuesday, April 5, 2011 at 7:02pm

Chemistry(HELP)
Can you check this answer? 1. Heat of combustion is the heat released by the complete combustion of one mole of a substance. a.) True b.) False Answer: b.) False Is this right?
Tuesday, April 5, 2011 at 11:42am

Chemistry: Answer check please!
1. Reactions follow the law of conservation of mass. a.) True b.) False Answer: True 2. Reactants are the materials used in a chemical reaction. a.) True b.) False Answer: True 3. In a chemical equation, the mass on the left of the arrow equals the mass on the right. a.) True ...
Saturday, April 2, 2011 at 7:32pm

chemistry
what is the specific heat capacity of substance X when 34.80 g of X is heated from a starting temperature of 20.5 C to 40.9 C by 2.54 kJ of energy
Thursday, March 31, 2011 at 6:46pm

Biology
Which substance does not leave the nephrons by active transport? a)Potassium ions b)Water c)Calcium ions d)Phosphate ions e)glucose I think its either water or glucose... Another question.. Two strategies- negative feedback and antagonistic hormones- have evolved to maintain a...
Thursday, March 31, 2011 at 6:32pm

Chemistry
Iron(III) oxide can be reduced by carbon monoxide. Fe2O3(s) + 3CO(g) 2Fe(s) + 3CO2(g) Use the following thermodynamic data at 298 K to determine the equilibrium constant at this temperature. Substance: Fe2O3(s) CO(g) Fe(s) CO2(g) ΔH° f (kJ/mol): -824.2 -110.5 0 -393.5...
Thursday, March 31, 2011 at 5:56pm

Chemistry
On the basis of the solubility curve for KNO3 what type of substance would you expect KNO3 to be?
Wednesday, March 30, 2011 at 2:27pm

chemistry
A 79.9-L sample of a gaseous hydrocarbon, measured at 1.00 atm pressure and 25.0°C, is burned in excess oxygen, liberating 4.24 × 10^3 kJ of heat at constant pressure. What is the identity of the hydrocarbon? (R = 0.0821 L · atm/(K · mol)) Substance H&...
Wednesday, March 30, 2011 at 12:09am

Chemistry
Suppose that 0.650 mol of methane, CH4(g), is reacted with 0.800 mol of fluorine, F2(g), forming CF4(g) and HF(g) as sole products. Assuming that the reaction occurs at constant pressure, how much heat is released? Substance & Enthalpy of Form. (kJ/mol) C(g) 718.4 CF4(g) -679....
Monday, March 28, 2011 at 10:02pm

chemistry
Substance x has a molar mass of 107.6 g/mol. when 2.50 g of substance x burns in an iron calorimeter the temp. of calorimeter and water (2.000Kg)increases from 25.8 d Celsius to 38.7 d celsius. What is the molar heat of combustion of substance x in kJ/mol. the heat capacity of...
Sunday, March 27, 2011 at 3:14pm

chemistry
there are __ reprensentative particles in a mole of any substance
Sunday, March 27, 2011 at 12:42pm

chemistry
substance X has a molar mass of 107.6 g/mol. When 2.50 g of substance x burns in an iron calorimeter, the temp. of the calorimeter and the water (2.000 Kg) increases from 25.8 deg. C to 38.7 deg. C. What is the molar heat of combustion of substance X in KJ/Mole. Heat capacity ...
Sunday, March 27, 2011 at 10:42am

Chemistry
H2C2O4 * 2H2O (s) is a primary standard substance. 2.3688 grams of oxalic acid dihydrate were completely neutralized by 42.56 milliliters of NaOH solution. Calculate the molar concentration of the NaOH solution.
Saturday, March 26, 2011 at 11:39pm

CHEMISTRY
The equilibrium constant for the reaction, SO2(g)+ NO2(g) <----> NO(g)+ SO3(g) has been experimentally determined as a function of temperature. The results are presented in the table below. T (°F) KC 285 662 752 156 842 93.4 932 59.6 1022 40.2 If 0.0791 ft3 SO2, 0....
Thursday, March 24, 2011 at 11:39pm

Chemistry
If the cyclohexane is initially contaminated with a soluble non-reactive, non-volatile substance, will the change in freezing point, delta Tf, be a. Higher b. Lower c. The same as the uncontaminated cyclohexane? There will be no change hence delta Tf will be the same as the ...
Tuesday, March 22, 2011 at 2:30am

Chemistry
A: A student must make a five-fold dilution of a 2.15 M HCl solution. If the student wishes to make 75.0 mL of the diluted solution, what volume of the 2.15 M solution will he need to dilute? B: What is the concentration of the diluted substance?
Monday, March 21, 2011 at 2:16pm

chemistry
in stoichiometry, after you have balanced the formula, how do you know which substance is the one you use to convert all 4 times to get the wanted reults
Wednesday, March 16, 2011 at 4:07pm

Chemistry
the specific heat of a substance is the energy (Joules) required to raise one gram of substance by one degree celsius (units J/g°C). Heating 225.0° cm3 of a solid from 36.1° to 74.3°C takes 35850 J of energy. The density of the solid at 36.1°C is 1.75 g/cm3...
Tuesday, March 15, 2011 at 11:27pm

chemistry
In a chemical reaction, substance A combines with substance B to form substance Y. At the start of the reaction, the quantity of A present is a grams, and the quantity of B present is b grams. Assume a> and <img src=. At time t seconds after the start of the reaction, ...
Monday, March 14, 2011 at 2:50am

science
how many half-lives have passed if 87.5% of a substance has decomposed? how many if 99.999% has decomposed?
Monday, March 14, 2011 at 12:42am

physics
Find the density of a substance whose mass is 28 grams and whose volume is 4 cubic centimeters
Thursday, March 10, 2011 at 7:13pm

chemistry
what is the molarity of 40g in 0.5L of solution. Molecular weight of substance is 100.09g/mole.
Thursday, March 10, 2011 at 10:36am

chemistry
if you have 1000g of a substance at -20 degrees celsius with a specific heat of .110 c/1 degree celsius and you add 12 kilojoules to it what is the resulting temperature?
Tuesday, March 8, 2011 at 9:41am

Physics
Calculate the net charge on a substance con- sisting of a combination of 1.9 × 10^13 protons and 3.9 × 10^13 electrons. Answer in units of C.
Monday, March 7, 2011 at 9:37pm

Physics
Calculate the net charge on a substance con- sisting of a combination of 1.9 × 10^13 protons and 3.9 × 10^13 electrons. Answer in units of C.
Monday, March 7, 2011 at 9:36pm

Physics
Calculate the net charge on a substance con- sisting of a combination of 1.9 × 10^13 protons and 3.9 × 10^13 electrons. Answer in units of C.
Monday, March 7, 2011 at 9:34pm

Chemisty
The Specific heat of a substance is the energy (joules) required to raise one gram of substance by one degree celsius (units J/g °C). Heating 225.0 cm3 of a solid from 36.1 °C to 74.3 °c takes 35850 J of energy. The density of the solid at 36.1 °C is 1.75 g/cm3...
Sunday, March 6, 2011 at 2:59am

chemistry
Find the volume in liters. 6.5kg of a substance with a density of 7.96g/mL Im confused about how it would come out in liters.. if the mass is in kg and the density is in g/mL
Saturday, March 5, 2011 at 1:45am

precalculus
Twenty percent of a radioactive substance decays in ten years. By what percent does the substance decay each year?
Thursday, March 3, 2011 at 5:40pm

medical
I. AMBULATORY CARE FACE SHEET Admit Date: 7/8/20XX @ 20:22 Discharge Date/Time: 7/9/20XX @ 10:10 Sex: M Age: 47 Disposition: Home Admitting Diagnosis: Possible esophageal foreign body. Discharge Diagnosis: Esophageal foreign body. Procedures: EGD with foreign body removal. ...
Monday, February 28, 2011 at 3:21pm

chemistry
The simple rule “Like dissolves like” is often used to describe the solubility of a substance in different solvents. Write a short paragraph discussing your evidence for this rule. Include in your discussion where you think this rule works best and where it seems to ...
Sunday, February 27, 2011 at 2:21pm

chemistry
When 1.70 mol CO2 and 1.70 mol H2 are placed in a 0.850 L container at 395 C, the following equilibrium is achieved: CO2(g) + H2(g) = CO(g) + H2(g) If Kc = 0.802, what are the concentrations of each substance in the equilibrium mixture?
Friday, February 25, 2011 at 2:31am

Chemistry
which substance has the greatest intermolecular forces of attraction between molecules ? 1)propanone 2)ethanol 3)water 4)ethanoic acid dont really understand, please help
Thursday, February 24, 2011 at 10:57pm

chemistry
if 50 grams of a substance with temperature of 20 degrees C and a specific heat of 2 is mixed with 200 grams of water at 40 degrees C, what will be the equilibrium temperature of the mixture?
Thursday, February 24, 2011 at 2:02pm

bio (plasma membrane)
I understand that the plasma membrane is composed of a polar head and non polar tail. I read in my textbook that small non-polar molecules readily pass through and that polar and non-polar repel. so how do non-polar substance pass the the polar head? please explain.
Saturday, February 19, 2011 at 3:14pm

chemistry
The molar heat of solution of a substance is found to be +35.34 kJ/mol. The addition of 0.20 moles of this substance to 1.5 L water initially at 55. °C results in a temperature decrease. Assume the specific heat of the resulting solution to be equal to that of pure water. ...
Wednesday, February 16, 2011 at 5:17pm

Art Appreciation
Thematic Substance: Tintoretto’s and da Vinci’s Last Supper. Contrast Tintoretto’s The Last Supper with Leonardo’s Last Supper. In your post, include the differences in media as well as thematic substance.
Wednesday, February 16, 2011 at 11:18am

chemistry
A 6.50 g piece of substance B was rolled out into a thin sheet measuring 24.0 cm x 18.0 cm. a.) Calculate the volume of the sheet of metal. Show work; use labels. [I also had to look at a graph, here is some information about substance B: y=mx+b m(slope): 8.52 g/cm^3 b(Y-...
Tuesday, February 15, 2011 at 11:41am

toxicology
a) Generally speaking, the ability of a substance to move across a membrane by passive diffusion is enhanced by decreasing size and by an increasing octanol/water coefficient. T or F
Sunday, February 13, 2011 at 10:19pm

Chemistry
what is an example of a substance that has both ionic &covalent bonds & where are these bonds formed.
Sunday, February 13, 2011 at 9:42pm

chemistry
22. Choose the best description for a solid held together by London forces. A. This substance melts at -30 °C to give a liquid that does not conduct electricity. B. This substance melts at 650 °C and both the solid and liquid phases conduct electricity. C. This ...
Sunday, February 13, 2011 at 3:32pm

chemistry
If 14.8 kJ of heat is given off when 1.6 g of HCl condesses from vapor to liquid, what is the delta Hcond. for this substance?
Thursday, February 10, 2011 at 10:30am

chemistry
Given: hexane- -density at 25 degrees Celsius (.660g/ml) -Vapor pressure of pure substance at 25 degrees Celsius (150 torr) -heat if vaporization (21.0 kj/mol) -55 mL What mass of hexane vaporizes at 25 degrees Celsius?
Tuesday, February 8, 2011 at 7:11pm

integrated science
explain the difference between the following three substance carbon (c) carbon dixoide (co2) and oxygen (o2)
Monday, February 7, 2011 at 4:07pm

science
What is the route(s) of entry for the toxic substance to the bodyfollowing: A hiker becomes violently ill after being bitten by a rattlesnake
Sunday, February 6, 2011 at 8:55pm

Phys
Charged particles #1 and #2 are 0.4 cm apart in air and exert a 100 Nt on force each other. If the 2 charges (at the same distance) exert a 25 Nt for on each other in substance "blox", then "blox" has a dielectric constant of: 0, 4, 2, 2500, more info needed
Saturday, February 5, 2011 at 3:48pm

chemistry
How many grams of each substance are needed to prepare th e following solutions? 50.0 ml of 8.0%(w/v)KCL
Wednesday, January 26, 2011 at 11:39am

health records law
Of the following types of information, which one has the strictest rules regarding the release of information? A. substance abuse B.mental illness C.genetic information D.Adoption information
Tuesday, January 25, 2011 at 4:03pm

Chemistry
C2H2(g) + 2 H2(g)--> C2H6(g) Information about the substances involved in the reaction represented above is summarized in the following tables. Substance/ So (J/mol∙K) /∆Hºf (kJ/mol) C2H2(g) / 200.9 / 226.7 H2(g) / 130.7 / 0 C2H6(g)/ ?? / -84.7 Bond Bond ...
Tuesday, January 25, 2011 at 2:30pm

microbiology
In a solution, the substance present in the largest amount is referred to as the solvent. Consider adding one ounce of oil to one gallon of water. Using terms, such as solute, solvent, polar, non-pola
Tuesday, January 25, 2011 at 7:07am

Chemistry-pH
If you are given a colored substance as a sample, how would you measure the pH of a sample?
Tuesday, January 25, 2011 at 5:12am

chemistry
The pH of a solution is 6.0. Explain how the addition of the following substance would alter (or not alter) the pH of the solution. a. HCl b. NaOH c. H20
Monday, January 24, 2011 at 10:58pm

ap chem
how would each error affect the molar mass of antifreeze ( too high, too low, no effect. a) the thermometer used actually read 1.4 too high b) after measuring the 50 of distilled water to make an antifreeze solution you spilled some. c)you lost some of you antifreeze solution ...
Monday, January 24, 2011 at 7:38pm

biology
a biologist prepared a strip of agar (a gelatin- like substance) as shown in the figure below. at position 7, he placed a concentrated sample of amino acid A and at position 1, a concentrated sample of enzyme E. E is known to catalyze the conversion of A to a product P. Assume...
Sunday, January 23, 2011 at 8:42pm

Chemistry
Substance A has a density of 4.0 g/mL and substance B has a density of 2.0 g/mL. If we have equal-mass samples of each, which has the greatest volume?
Sunday, January 23, 2011 at 7:47pm

Chemistry
When an unknown substance weighing 2.386g is heated for 5 minutes and cooled to room temperature, it's new weight is 3.183g. No smoke rose for the sample while it was heated and it turned from white to a slight yellow. Were the students performing this experiment ...
Sunday, January 23, 2011 at 4:58pm

Chemistry Help Please!
A kilogram of aluminum metal and a kilogram of water are each warmed to 75 oC and placed in two identical insulated containers. One hour later, the two containers are opened and the temperature of each substance is measured. The aluminum has cooled to 35 oC while the water has...
Sunday, January 23, 2011 at 12:31pm

Chemistry
In a chemical reaction, exactly 2 mol of substance A react to produce exactly 3 mol of substance B 2A ---> 3B How many molecules of substance B are produced when 27.9 g of substance A reacts? the molar mass of substance A is 24.7 g/mol STEP 1: convert the mass of A to moles...
Saturday, January 22, 2011 at 5:10pm

chemistry
What substance could be used to test if a sample of petrol contains any water as an impurity?
Saturday, January 22, 2011 at 4:33pm

ALLIED HEALTH
A mutual consent registry is relevant to obtaining medical information about A. substance abuse. B. psychological conditions that endanger the public. C. genetic information for research purposes. D. a party to an adoption. I THINK: D
Thursday, January 20, 2011 at 5:44am

english 3
A wind began to blow, and he shivered. With all his strength he tried to hold and to understand the mood that had come upon him. In that high place in the darkness the two oddly sensitive human atoms held each other tightly and waited. In the mind of each was the same thought...
Wednesday, January 19, 2011 at 6:37pm

Chemistry Help!!
a kilogram of aluminum metal and a kilogram of water are each warmed to 75 degree Celsius and placed in two identical insulated containers. one hour later, the two containers are opened and the temperature of each substance is measured. the aluminum has cooled to 35 degree ...
Wednesday, January 19, 2011 at 11:32am

Chemistry
I have a couple of questions I need a hand with: 1. Oxygen has a melting point of -218 degrees celcius and a boiling point of -183 degrees celcius. This means that oxygen would be a liquid at...? Please do not tell me the answer, but tell me the relation between the melting ...
Tuesday, January 18, 2011 at 10:49am

chemistry
The heat of vaporization of a substance is 2900 J/g at its boiling point of 313C. How much of this substance can be vaporized if 58700 J of energy are available?
Monday, January 17, 2011 at 5:36pm

chemistry
Carbon disulfide,CS2, is a volatile, flammable liquid. It has a vapor pressure of 426.6 mmHg at 29.8C and 760.0 mmHg at 46.5C. What is the heat of vaporization of this substance?
Monday, January 17, 2011 at 2:57pm

chemistry help
a kilogram of aluminum metal and a kilogram of water are each warmed to 75 degree celisus and placed in two identical insulated containers. one hour later, the two containers are opened and the temperture of each substance is measured. the aluminum has cooled to 35 degree ...
Monday, January 17, 2011 at 1:42pm

chemistry
a kilogram of aluminum metal and a kilogram of water are each warmed to 75 degree celisus and placed in two identical insulated containers. one hour later, the two containers are opened and the temperture of each substance is measured. the aluminum has cooled to 35 degree ...
Monday, January 17, 2011 at 1:33pm

Chemistry
C2H2(g) + 2 H2(g)--> C2H6(g) Information about the substances involved in the reaction represented above is summarized in the following tables. Substance/ So (J/mol∙K) /∆Hºf (kJ/mol) C2H2(g) / 200.9 / 226.7 H2(g)/ 130.7 / 0 C2H6(g)/ ?? / -84.7 Bond Bond ...
Saturday, January 15, 2011 at 8:43pm

Chemistry
C2H2(g) + 2 H2(g)--> C2H6(g) Information about the substances involved in the reaction represented above is summarized in the following tables. Substance So (J/mol∙K) ∆Hºf (kJ/mol) C2H2(g) 200.9 226.7 H2(g) 130.7 0 C2H6(g) - - -84.7 Bond Bond Energy (kJ/mol...
Saturday, January 15, 2011 at 2:35pm

chemistry
C2H2(g) + 2 H2(g)--> C2H6(g) Substance So (J/mol∙K) ∆Hºf (kJ/mol) C2H2(g 200.9 226.7 H2(g) 130.7 0 C2H6(g) -- -84.7 Bond Bond Energy (kJ/mol) C-C 347 C=C 611 C-H 414 H-H 436 If the value of the standard entropy change, ∆Sº for the reaction is -...
Thursday, January 13, 2011 at 1:13pm

Chemistry
C2H2(g) + 2 H2(g)--> C2H6(g) Substance So (J/mol∙K) ∆Hºf (kJ/mol) C2H2(g 200.9 226.7 H2(g) 130.7 0 C2H6(g) -- -84.7 Bond Bond Energy (kJ/mol) C-C 347 C=C 611 C-H 414 H-H 436 If the value of the standard entropy change, ∆Sº for the reaction is -...
Wednesday, January 12, 2011 at 7:31am

Thermodynamic
N2 is described by its state properties of temperature @ - 100 Degree C, and pressure @10.0 MPa. Determine if it is reasonable to assume that the given substance behaves as an ideal gas at the specified state. If the substance is determined as a real gas or non-ideal substance...
Monday, January 10, 2011 at 1:19pm

Chemistry
which substance takes the shape of and fills the volume of any container into which it is placed ? (1)H2O (l) (2)CO2(g) (3)I2(s) (4)Hg(l)
Sunday, January 9, 2011 at 10:27pm

Science
What occurs when a substance melts? 1) It changes from solid to liquid, and heat is absorbed. 2) It changes from solid to liquid, and heat is released. 3) It changes from liquid to solid, and heat is absorbed. 4) It changes from liquid to solid, and heat is released.
Sunday, January 9, 2011 at 10:19pm

adv pre algebra
the temperature of a substance increases by 10 degrees celsius in 5 minutes. write this as a unit rate. then convert into degrees fahrenheit per hour.
Sunday, January 9, 2011 at 10:06pm

Chemistry
As a substance changes from liquid to gas, the average distance between molecules (1) decreases (2)increases (3) remains the same
Sunday, January 9, 2011 at 7:12pm

Chemistry
which substance has a definite shape and a definite volume at STP ? (1)NaCl(aq) (2)Cl2(g) (3)CCl4(l) (4)AlCl3(s) is it 4 because its a solid? Am i right ?
Sunday, January 9, 2011 at 7:03pm

chemistry
what would be a diagram that we can use to idenitify an unknown substance using electrochemical data. we have a reduction table and ksp values and we also that the substance is either bromine or iodine
Sunday, January 9, 2011 at 2:54pm

science
how do we determine the identification of an unknown substance using a thermochemical test ??? i mean the procedure
Sunday, January 9, 2011 at 2:15pm

Chemistry
When 2.50g of an unknown solute is dissolved in 40.0g of ethanol the solution boils at 79.4C. The normal boiling point of this substance is 78.4C and it has a kb of 1.22C/m. (a) What is the molality of this solution? (b) What is the molecular weight of the solute?
Sunday, January 9, 2011 at 12:10pm

thermodynamic
N2 is described by its state properties of temperature @ -100 degree C, and Pressure @ 10.0 MPa. Determine if it is reasonable to assume that the given substances behaves as a real or non-ideal substance determine its compressibility factory Z.
Saturday, January 8, 2011 at 5:02pm

Physics
Does the frequency of light change as it enters a different substance? I know that the speed changes. The question might seem easy, but I have contradicting notes, so I'm confused.
Thursday, January 6, 2011 at 5:15pm

physical
Suppose an unknown substance has a melting temperature of 1,200 degrees Celsius and a density of 16.7 g/cm3. However, the different individual atoms that make up the element have very different melting temperatures and densities. Which is the unknown substance most likely
Tuesday, January 4, 2011 at 10:27am

chemistry
Combustion reactions involve reacting a substance with oxygen. When compounds containing carbon and hydrogen are combusted, carbon dioxide and water are the products. Using the enthalpies of combustion for C4H4 (-2341 kJ/mol), C4H8 (-2766 kJ/mol) and H2 (-286 kJ/mol), ...
Tuesday, December 28, 2010 at 1:34pm

Chemistry
A student mixes two water solutions with an initial temperature of 25 degrees C to form a final substance with a mass of 65 grams at 30 degrees C. What is the heat change in kJ?
Tuesday, December 14, 2010 at 11:05pm

Physics
How does the index of refraction relate to the speed of light in a substance?
Tuesday, December 14, 2010 at 10:40pm

chemistry
how do you determine whether a substance is ionic or molecular
Tuesday, December 14, 2010 at 6:53pm

chemistry
How many moles of antifreeze (a molecular substance) must be added per liter of water to protect the cooling system of a motocar to -30 degrees F.
Tuesday, December 14, 2010 at 4:28pm

Physics and chemistry
Chapter 1 & 2 Review Questions 1. Compare and Contrast the two main branches of physical science. 2. Distinguish between scientific laws and scientific theories. 3. Describe the steps of the scientific method. 4. Explain the objective of a consistent system of units, and ...
Monday, December 13, 2010 at 5:39pm

Science
I have posted this question before and I have waited for 3 hours and no one is helping me. Please help me. I have 2 questions. 1.state whether each substance is a mechanical mixture, a suspension, or a solution. My answers are at the bottom. a)green relish b)soda pop in a ...
Sunday, December 12, 2010 at 8:32pm

Gen Chemistry
The following absorption data of a solution was collected in a cell with 1 cm path length. The absorption of the same substance in a solution with unknown concentration was 0.197. What is the concentration of the unknown substance? c (M) A 1.00x10-3 0.119 2.00x10-3 0.243 3....
Sunday, December 12, 2010 at 8:00pm

Science (please help me)
I have 2 question on science 7. please help me. 1.state whether each substance is a mechanical mixture, a suspension, or a solution. My answers are at the bottom. a)green relish b)soda pop in a glass c)bubble tea d)traditional Aborigial paint made of red orchre and grease my ...
Sunday, December 12, 2010 at 7:56pm

Science HELP
state whether each substance is a mechanical mixture, a suspension, or a solution. My answers are at the bottom. a)green relish b)soda pop in a glass c)bubble tea d)traditional Aborigial paint made of red orchre and grease my answers= a)suspension b)solution c)suspension d)...
Sunday, December 12, 2010 at 6:48pm

Chemistry
The normal boiling point of a liquid is A. the temperature at which all three phases are in equilibrium. B. the only temperature at which there can be equilibrium between the liquid and gas states. C. the temperature at which the vapor pressure equals 760 mmHg. D. the ...
Thursday, December 9, 2010 at 4:10pm

Chemistry
An aqueous mixture containing starch (a colloid), NaCl, glucose, and albumin (a colloid) is placed in a dialyzing bag and immersed in distilled water. Which of the following correctly describes the location of the indicated substance after dialysis? A-albumin, inside B-starch ...
Sunday, December 5, 2010 at 12:55pm

Chemistry
Why is graphite such a good conductor of electricity? Why is diamond the hardest naturally occurring substance?
Sunday, December 5, 2010 at 9:31am

Chemistry
Which substance is a conductor of electricity ? (1)NaCl(s) (2)NaCl (l) (3)C6H12O6(s) (4) C6H12O6 (l) thanks for any help !
Thursday, December 2, 2010 at 5:18pm

chemistry
From the following information, determine ΔH°f of malonic acid, CH2(COOH)2(s). CH2(COOH)2(s) + 2O2(g) → 3CO2(g) + 2H2O(l); ΔH° = –861.0 kJ Substance ΔH°f (kJ/mol) CO2(g) –393.5 H2O(l) –285.8 A. 2613.1 kJ B. –1540.3 kJ C. &#...
Thursday, December 2, 2010 at 3:48pm

Chemistry
How will the boiling point of a substance be affected by increasing the atmospheric pressure? How will the boiling point of a substance be affected by decreasing the atmospheric pressure?
Wednesday, December 1, 2010 at 12:07pm

Chemistry/Science - please help!
An aqueous mixture containing starch (a colloid), NaCl, glucose, and albumin (a colloid) is placed in a dialyzing bag and immersed in distilled water. Which of the following correctly describes the location of the indicated substance after dialysis? A-albumin, inside B-starch ...
Tuesday, November 30, 2010 at 11:39am

Chemistry
An aqueous mixture containing starch, NaCl, glucose and albumin is placed in a dialyzing bag and immersed in distilled water. Which of the following, correctly describes the location of the indicated substance after dialysis? A. albumin, inside B. starch outside C. albumin ...
Monday, November 29, 2010 at 12:18pm

Substance Abuse
only certain people can become alcoholics? True or False. I think Its False?
Tuesday, November 23, 2010 at 9:23pm

Biology
The half -life of carbon-14 is 5,730 years.how much of an initial amount of this substance would remain after 17,190 years(3 Half-lifes
Tuesday, November 23, 2010 at 5:30pm

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