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October 30, 2014

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Recent Homework Questions About Substance Abuse

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chemistry
Which solvent is more preferential? Solubility of a substance: water- 2.0g/100ml or ether- 6.3g/100ml
Monday, October 15, 2012 at 8:17pm

science
substance a has a boiling point of 80% C and a density of 3.5 g/cc what is it and why
Thursday, October 11, 2012 at 5:57pm

AP Environmental Science
Consider the following heats, copper: 0.384J/g degrees, glass:0.502J/g degrees, water: 4.18J/g degrees, and lead:0.159J/g. Which substance once warmed, would be more likely to maintain its heat and keep you warm through a long party on a cold night?
Wednesday, October 10, 2012 at 4:31pm

Chemistry
An unknown substance has a mass of 16.3 g. The temperature of the substance increases by 20.1 degrees Celsius when 126 J of heat is added to the substance. What is the most likely identity of the substance? The table lists the specific heat capacities of select substances. ...
Tuesday, October 9, 2012 at 11:18pm

chemistry
A 0.0230 g sample of an unknown was dissolved in 2.260 g of benzene. The molality of this solution, determined by freezing point depression, was 0.0408 m. What is the molecular weight of the unknow substance?
Thursday, October 4, 2012 at 11:23pm

chemistry
Why is gas a chemical reaction not detectable by sight? Explain? my answer is because the atoms or molecules of matter in the gaseous state move freely among each other, and are, in most instances, packed more loosely than the molecules of the same substance in the solid or ...
Thursday, October 4, 2012 at 4:47pm

Organic chemistry recrystallization
Say you have a substance X will .5 g of X dissolve in 5.0 ml of water if boiled at 80 degrees? And at what temperature will crystals begin to form?
Thursday, October 4, 2012 at 1:01am

General Chemistry
Change these word equations into formula equations and balance them. Be sure to use the proper symbols to indicate the state of each substance as given. (a) Magnesium metal is placed into hydrobromic acid solution, forming hydrogen gas and aqueous magnesium bromide. (b) When ...
Wednesday, October 3, 2012 at 10:11am

Physical Science
8 letter word for a substance that can be broken down into two or more simpler substances?
Tuesday, October 2, 2012 at 11:45pm

Chemistry
A 5.00L reaction vessel contains hydrogen at a partial pressure of 0.588atm and oxygen gas at a partial pressure of 0.302atm. The equation is 2H2(g)+O2(g)-> 2H2O(g). Suppose the gas mixture is ignited and the reaction produces the theoretical yield of the product. What ...
Tuesday, October 2, 2012 at 7:50pm

chemistry
A compound has the empirical formula CH2O. When 0.0866 g is dissolved in 1.0 g of ether, the solution’s boiling pint is 36.5oC. Determine the molecular formula of this substance
Monday, October 1, 2012 at 7:04am

chemistry
Calculate the molar mass of a non-electrolyte that lowers the freezing point of 25.0 g of water to - 3.9 oC when 4.27 g of the substance is dissolved in the water.
Monday, October 1, 2012 at 7:02am

chemistry
1.) a buffer is a substance which: a) donates H+ in acidic solutions b) accepts H+ in basic solutions c) accepts OH- in basic solution d) donates H+ in basic solution e) donates OH- in acidic solution f) accepts H+ in acid solution g) accepts OH- in acid solution h) donates OH...
Sunday, September 30, 2012 at 8:25pm

chemistry
a substance has a vapor pressure of 35.0 mmHg at 52.0 degrees Celsius and 70.0 mm Hg at 77.0 degrees Celsius. What is the heat of vaporization for this substance?
Sunday, September 30, 2012 at 5:57pm

Biology
1. How is both the external adn internal stimuli involved in doing this: You are hungry so you reach for an apple in a fruit bowl. 2. Why is a hypothesis important to controlled experiments? Is it becasue you are trying to explain the effect that it would have to a substance ...
Thursday, September 27, 2012 at 8:45pm

education
During the middle of the twentieth century, North American psychology was dominated by A. evolutionary theory. C. neuroscience. B. cognitive development. D. behaviorism. 8. What is a major limitation of the psychophysiological method? A. Investigators can’t be sure that ...
Thursday, September 27, 2012 at 6:32pm

Chemistry
Calculate the density of a substance in pennyweights per peck that has a volume of 0.371 hogsheads and a mass of 41.6 kg. 1 pennyweight = 1.55 grams 1 hogshead = 238.5 liters 1 peck = 9.091 liters. Answer in units of pw/pk.
Thursday, September 27, 2012 at 11:23am

chemistry
a buffer is a substance which? a) accepts OH- in basic solution b) accepts H+ in acid solutions
Wednesday, September 26, 2012 at 9:40pm

Chemistry
Which cannot be broken down chemically or physically into a simpler substance between sugar, salt, seawater, and copper?
Thursday, September 20, 2012 at 2:07pm

Chemistry
Which cannot be broken down chemically or physically into a simpler substance between sugar, salt, seawater, and copper?
Thursday, September 20, 2012 at 2:03pm

Chemistry
2) To the solution in problem 1 (d) at 100 degrees celsius, 10g of water are added, and the solution is cooled to 0 degrees celsius... (problem 1d: the number of grams of water required to dissolve a mixture containing 15 g KNO3 and 3.5 g CuSO4 * 5 H20, assuming that the ...
Tuesday, September 18, 2012 at 9:50pm

science
I need a little assistance. Can you help? The question which seems to be simple enough is What is a physical change? My son answered - A physical change is any change that alters the form or appearance of matter into a different substance. I do not agree. He is missing ...
Monday, September 17, 2012 at 10:57pm

statistics
Each year, approximately 160 colleges compete in the National Concrete Canoe Competition. Each team must design a seaworthy canoe from a substance not know for it's capacity to float. The canoes must weigh between 100 and 350 pounds. Find the midrange weight.
Sunday, September 16, 2012 at 9:44am

Chemistry
How can you predict the heat of combustion for a substance with no carbon atoms?
Thursday, September 13, 2012 at 8:37pm

chemistry
Ethanethiol (CH3CH2SH, pKa=10.6) was named the smelliest substance in existence. Draw the equilibrium that forms when ethanethiol is added to a solution buffered at pH 9, and show the relative proportions of all organic species.
Wednesday, September 12, 2012 at 11:39pm

chemistry
The speed of a substance is 13.056 m/s. What is the speed in cm/Ms??
Tuesday, September 11, 2012 at 12:47pm

CHEMISTRY HELP ASAP!
is it possible for one molecule of salicylic acid to form an ester with a second molecule of the same substance? Use equations and/or structures. Please help, i am pretty sure it couldn't because of steric hindrance, however i am not sure how to explain this further and ...
Tuesday, September 11, 2012 at 6:23am

chemistry (need asap!)
is it possible for one molecule of salicylic acid to form an ester with a second molecule of the same substance? Use equations and/or structures. Please help, i am pretty sure it couldn't because of steric hindrance, however i am not sure how to explain this further and ...
Tuesday, September 11, 2012 at 4:13am

Science
What is the substance inside the guard cells?
Monday, September 10, 2012 at 5:46pm

chemistry
what is the density of a substance if a 2.50 ml sample has a mass of 0.880g at room temperature? what is the specific gravity of the substance?
Sunday, September 9, 2012 at 11:25pm

chemistry
c= q/m*(delta)T q= heat or energy, measured in joules (J) c= specific heat of the substance m= mass of substance (delta)T= change in temperature It requires 14,749 J to heat 75.0 g of water from 20.0 degrees C to 67.0 degrees C?
Sunday, September 9, 2012 at 4:59pm

chemistry
What is the density of a substance that weighs 500g and fills a container that is 1/2 liter in size?
Thursday, September 6, 2012 at 7:57am

POl
An inactive substance or simulated medical procedure is called a
Sunday, September 2, 2012 at 6:39pm

substance abuse couseling
Process 1.Prewrite about your field of study and create a specific job for which you might want to apply at a particular business or organization in your area.Outline what that position would look like.Brainstorm details,names,titles,and facts to provide depth to your ...
Wednesday, August 29, 2012 at 5:17pm

Math
Find the half-life (in hours) of a radioactive substance that is reduced by 10 percent in 5 hours.
Tuesday, August 28, 2012 at 6:58pm

Chemisty
The average human body has 1.4x10^2 g of total K within it. Calculate the activity in disintegration/year of the potassium-40 in the average human body using your value of t1/2 (or K) of this substance
Thursday, August 23, 2012 at 7:18pm

chemistry
The average human body has 1.4x10^2 g of total K within it. Calculate the activity in disintegration/year of the potassium-40 in the average human body using your value of t1/2 (or K) of this substance
Wednesday, August 22, 2012 at 11:41pm

chemistry
On the pH scale, any substance with a value between 8 and 14 is considered _________.
Tuesday, August 14, 2012 at 2:58pm

chemistry
Calculate the following quantities. (See the periodic table.) (a) mass, in grams, of 2.54 10-2 mol of CdS g (b) number of moles of NH4Cl in 90.0 g of this substance mol (c) number of molecules in 5.081 10-2 mol C6H6 molecules (d) number of O atoms in 4.72 10-3 mol Al(NO3)3
Thursday, August 2, 2012 at 12:17am

science
what shows that the sea water is a mixture and not a pure substance? a. it has a sharp boiling point b. it has definite composition c. it consist of a single phase d. the components lose their individual properties
Tuesday, July 24, 2012 at 8:07pm

chemistry
i had 2 question left to finish but i cant really undersdand how to do it 9)design an elextrochemical cell using Pb(s) and Mn(s) and theire solutions and answer the following questions: i answerd a-i all that is left is j which is: indicate the substance oxidise,substance ...
Tuesday, July 24, 2012 at 6:09pm

Chem
suppose you could not tell whether a material was insoluble or slightly soluble in water form the appearance of the misture. Explain what you would do to determine whether this substance is slightly soluble.
Monday, July 23, 2012 at 4:32pm

chemistry
3) The melting point range of an unknown substance was determined to be 120-180 degree celcius. what can you tell about the purity of the unknown
Wednesday, July 18, 2012 at 6:29am

Science
What fraction of the original activity of a radioactive substance will remain at the end of half-life?
Monday, July 16, 2012 at 4:50am

science
what substance is being reduced in the following redox reaction? HgCl2 + Sn^2 = Sn^4 + Hg2Cl2 + Cl-
Friday, June 29, 2012 at 9:20pm

Chemistry
An impure sample of substance X melts at about 113 degress. Which of the substances could be X and state y Resorcinal 111 degrees Catechol 105 Nitrophenol 114 Butanamide 115 I think it is either catechol or resorcinol because as stated the higher the percentage of impurity the...
Tuesday, June 26, 2012 at 7:41pm

Physics
The pressure-volume graph shows an engine cycle where the working substance is an ideal monatomic gas (γ = 5/3). The process A-B is adiabatic. At point A, the pressure is 2.70×105 Pa and the volume is 0.0180 m3. At point B, the volume is 0.0450 m3. During a cycle, ...
Monday, June 25, 2012 at 11:18am

Chemistry(check)
Please check for me. 1. For the reaction CH3COOH--->CH3COO + H+, which of the following statements is true? CH3COOH is a Brønsted-Lowry acid.<--- CH3COO is an Arrhenius base. CH3COO is a Lewis base. CH3COOH is a Brønsted-Lowry base. 2. Of the metals Pb, Mg...
Friday, June 22, 2012 at 5:29pm

Chemistry
A calorimeter contains 30.0 mL of water at 11.0 degrees C. When 1.50 g of X (a substance with a molar mass of 65.0 g/mol) is added, it dissolves via the reaction: X (s)+H2O (l) ---> X (aq) and the temperature of the solution increases to 26.0 degrees C. Calculate the ...
Thursday, June 21, 2012 at 9:00pm

Chemistry(Please Respond)
Willsomeone, please check my answers? (<-----) indicates my answer. 1.A student increases the temperature of a 556 cm³ balloon from 278 K to 308 K. Assuming constant pressure, what should the new volume of the balloon be? 320 cm3 501 cm3 1232 cm3 616 cm3<------ 2. ...
Thursday, June 21, 2012 at 8:10am

Chem(Check Please)
Will someone please check my answers for me? I put arrows(<----) to indicate my answer. Thank you in advance. 1.A student increases the temperature of a 556 cm³ balloon from 278 K to 308 K. Assuming constant pressure, what should the new volume of the balloon be? 320 ...
Thursday, June 21, 2012 at 1:32am

english
I'm writing an essay on Substance Abuse. Its an informative essay and I am having trouble coming up with a topic. Can you please give me some suggestions? I am leaning towards something to do with marijuana possibly...
Friday, June 15, 2012 at 12:28pm

chemistry
A substance placed in a container has a fixed volume and takes up the shape of the container. In which state does this substance exist?
Wednesday, June 13, 2012 at 11:50am

Art
Thank you, Writeacher. Here is the last part of the same summary. Could you please check it? 1) The names of the ingredients are reported using an international code, INCI which is the same for all EU countries though it is also used in other countries, for example USA, Russia...
Saturday, June 9, 2012 at 5:09pm

Chemistry
Iodine pentafluoride is an incendiary agent, a substance that ignites combustible materials. This compound is usually made by passing fluorine gas over solid iodine, but it also forms when iodine monofluoride changes into the element iodine and iodine pentafluoride. (a) Write ...
Saturday, June 9, 2012 at 2:08pm

PHYSICS
1. 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?
Tuesday, June 5, 2012 at 9:31pm

Math
A radio substance has a half-life of 10 years. What is its annual decay rate?
Tuesday, June 5, 2012 at 3:46am

physics
A building has become accidentally contaminated with radioactivity. The longest-lived material in the building is strontium-90. (The atomic mass of Sr is 89.9077 u.) If the building initially contained 4.8 kg of this substance and the safe level is less than 10.0 counts/min, ...
Sunday, June 3, 2012 at 9:02pm

Science
Could you please check these sentences on LSD? Thank you, Writeacher. 1) LSD is a psychoactive substance capable of generating perceptual alterations. It was synthesized for the first time in 1938 by Albert Hoffman of Sandoz laboratories in Basel. 2) The full name of that ...
Wednesday, May 30, 2012 at 6:53pm

chemistry
What is the specific heat of an unknown substance if 2000 J of energy are required to raise the temperature of 4 grams of the substance 5 degrees Celsius?
Wednesday, May 30, 2012 at 9:22am

chemistry
What chemical substance is in red cabbage which serves as an indicator for acids and bases?
Monday, May 28, 2012 at 6:33pm

Minoxidil
So, I'm doing a research project for my chemistry class, and one of the parts that I have to answer is the chemical reaction of the substance that I'm researching. But there's a problem. I've searched every single website regarding minoxidil, but I cannot find ...
Monday, May 28, 2012 at 6:20pm

physical sciences
Diamond is the hardest substance known while graphite is one of the softest. Both are made only of carbon atoms. What is the most likely reason why this is true? A. Both are bonded ionically. B. Both are bonded covalently. C. The carbon atoms are arranged differently in ...
Friday, May 25, 2012 at 9:28pm

Life orientation
Recommendations on how to address substance abuses
Tuesday, May 22, 2012 at 1:58pm

Life orientation
In which ways can human/environment can affected by substance abuses?
Tuesday, May 22, 2012 at 1:51pm

life orientation
Two Institution that are involved in supporting or reddresing substance abuse r
Sunday, May 20, 2012 at 4:13pm

CHEMISTRY
Here is what my lab was about: Properties of alcohols: First, I wrapped the bulb of a thermometer with a tissue secured with a wire. Then I squeeze enough methanol onto the tissue to completely saturate. At the same time, another person starts the stopwatch, reads the ...
Wednesday, May 16, 2012 at 7:20am

english
Please read the following excerpt from an essay, and answer the question that follows. Biologically, adolescence is marked by hormonal changes that produce secondary sexual characteristics. These include breast development in females and beard growth in males. (Psychologically...
Thursday, May 10, 2012 at 12:41am

chemistry
Subject – equilibria Pure ethanoic acid (25.0cm3, CH3COOH), pure ethanol (35.0 cm3, C2H5OH) and pure water (20.0cm3, H2O) were mixed in a sealed flask at room temperature. The flask was placed in a heated water bath and maintained at 323K until equilibrium was established...
Monday, May 7, 2012 at 4:39pm

Physics!!
Green light is emitted when electrons in a substance make a particular energy-level transition. If blue light were instead emitted from the same substance, would it correspond to a greater or lesser change of energy in the atom? and why?
Wednesday, May 2, 2012 at 2:03am

Alegbra
Andrew measures the amount of a very unstable substance to be 100 moles. The half-life of this substance is 3 days (after 3 days, half is gone). Write an exponential function that models this situation where y is the amount of substance and x is time in days. Thank you for ...
Tuesday, May 1, 2012 at 6:58pm

life orientation
explain 5 factors that contribute to the substance abuse
Sunday, April 29, 2012 at 5:03pm

chemistry
Substance X has a molar extinction coefficient (E) of 4725 l.mol-1 cm-1. How many micromoles of X are needed to produce an absorbance of 1.0 in a 1 ml cuvette?
Sunday, April 29, 2012 at 2:02am

Chemistry
I can't seem to get this problem, i really dont understand it Chemical reactions can also be coupled. The decreasing free energy of a spontaneous change can be stored in substance whose formation would not ordinarily be spontaneous. Living organisms have a remarkable ...
Saturday, April 28, 2012 at 2:28pm

Chemistry
assume equal masses of the following substances, all of them at 20.0 degrees C and exposed to the same source of heat simultaneously. Which substance will reach a temp of 35.0 degress faster? aluminium sp 0.900 lead sp 0.128 titanium sp 0.523 tin sp 0.222
Saturday, April 28, 2012 at 11:07am

physics
The thermal capacity of 10g of a substance is 8 calories. the specific heat is in J/kg-K options : 1.3360 2.3630
Saturday, April 28, 2012 at 2:19am

organic chemistry
If 5 grams of diphenylacetylene is dissolved in 40 ml cyclohexene, calculate the pressure change needed to completely hydrogenate this substance at room temperature and 50 degrees celcius.
Thursday, April 26, 2012 at 11:38am

chem
Which statement is wrong? 1. Adding the same amount of heat to two different objects will produce the same increase in temperature. 2. When the same amount of heat produces different changes in temperature in two substances of the same mass, we say that they have different ...
Wednesday, April 25, 2012 at 7:08pm

Maphokwane high school
Discuss 5 ways in which the substance abuse human or environmental problem impacts on the community.
Wednesday, April 25, 2012 at 1:16pm

Maphokwane high school
Discuss 5 ways in which the substance abuse human or environmental problem impacts on the community.
Wednesday, April 25, 2012 at 1:13pm

Savannah park Secondary.grade 12 l.o
Describe the life style disease/behaviour and explain 5 factor that contribute to substance abuse
Monday, April 23, 2012 at 7:11pm

science 3
11. The freezing point of a substance is ____ the melting point of the same substance. (1 point)greater than less than equal to unrelated to 12. For most substances, the distance between particles is smallest when the substance ____. (1 point)exists as a gas exists as a liquid...
Tuesday, April 17, 2012 at 1:34pm

physics
calculate the net charge on a substance consisting of a combination of 3.0X10^13 protons and 8.6X10^13 electrons.
Monday, April 16, 2012 at 2:22pm

Chemistry
Do the following parameters indicate how stable a substance is? 1) Viscosity of a substance 2) Optical rotation of a substance
Sunday, April 15, 2012 at 12:52am

Chemistry help
A substance with pH of 3 is 10 times as Acidic as a substance with a pH of 4. *****or******* A substance with a pH 3 is twice as acidic as a substance with a pH of 4.
Saturday, April 14, 2012 at 4:42pm

Chemistry
Are the following parameters stability indicating? 1) Viscosity of a substance 2) Optical rotation of a substance
Friday, April 13, 2012 at 9:07pm

Chemistry
Which of the following is correct? A)A substance with pH of 3 is 10 times as Acidic as a substance with a pH of 4. B)A substance with a pH 3 is twice as acidic as a substance with a pH of 4.
Thursday, April 12, 2012 at 11:21am

sCIENCE PLZZZZZZZZ HELP
1. The surface tension in a cup of water is caused by ____. (1 point)attractive forces between the water and its container attractive forces between water molecules adhesive forces between water molecules adhesive forces between the water and its container 2. The measure of ...
Wednesday, April 11, 2012 at 12:04pm

Science
1. The surface tension in a cup of water is caused by ____. (1 point)attractive forces between the water and its container attractive forces between water molecules adhesive forces between water molecules adhesive forces between the water and its container 2. The measure of ...
Wednesday, April 11, 2012 at 11:29am

physics
Calculate the net charge on a substance consisting of a combination of 4.3 multiplied by 1013 protons and 2.5 multiplied by 1013 electrons.
Tuesday, April 10, 2012 at 7:59pm

physics
To say a substance is electrically polarized is to say that its net charge is ____________________. A) either negative or positive, but relatively weak.B) weakly positive in sign.C) None of these.D) is normally zero with opposite charges on opposite ends.E) weakly negative in ...
Tuesday, April 10, 2012 at 5:46pm

scientist
Pretend you are a scientist and you just found a solid substance in the ground where you were digging. What types of tests would you do on this substance? How would you determine if it is a rock or a mineral? Describe your substance (yes you can make something up here that ...
Monday, April 9, 2012 at 9:46pm

Life orientation
Substance abuse.5 ways in which the human or environmental problem impact on the community only in south africa
Sunday, April 8, 2012 at 1:53pm

Chemistry
A substance (CD) decomposes into C and D At the temperature of the experiment, 15.0% of CD is decomposed when equilibrium is established. a) if the initial concentration of CD is 0.200mol/L, what are the equilibrium concentrations of CD, C and D? I got 0.17 for CD and I got 0....
Wednesday, April 4, 2012 at 10:11pm

Chemistry
A calorimeter contains 22.0 mL of water at 14.0 C. When 2.50 g of X (a substance with a molar mass of 66.0 g/mol) is added, it dissolves via the reaction X(s)+H_2O(l)--------> X(aq) and the temperature of the solution increases to 25.5 C. Calculate the enthalpy change, ...
Monday, April 2, 2012 at 2:24pm

English
i please need help with two short stories today. i write the first one here it be called Chicken-Hips. The women of the household clucked disapprovingly when they saw me. It was the first time I had worn African clothes since my arrival in tiny, dusty Gambia, and evidently ...
Tuesday, March 27, 2012 at 7:47pm

Chemistry
Find the amount of themal energy needed to raise the temperature of 5 g of a substance from 20 c to 30 c if the specific heat of the substance is 20.1 j/g c
Tuesday, March 20, 2012 at 3:15pm

chemistry
water has one of the largest specific heats of any substance. why is it important for human body?
Monday, March 19, 2012 at 1:30pm

calculus
The rate at which an amount of a radioactive substance decays is modeled by the differential equation dA/dt = kA, where A is the mass in grams, t is the time in years, and k is a constant. Answer the following. a) If a 100-gram sample of the radioactive substance decays to 95 ...
Monday, March 19, 2012 at 12:43pm

Chemistry
The solubility of a substance is 12.0 g per 100.0 g of water at 60 C. How many grams of the substance can crystallize from a saturated solution that contains 200.0 g of water at 60 C if the solution is cooled to 20 C?
Sunday, March 18, 2012 at 10:27pm

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