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October 2, 2014

Homework Help: Health: Substance Abuse

Recent Homework Questions About Substance Abuse

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Chem
3.297 g of a substance (containing only C, H, and O) is burned in a combustion analysis apparatus. The mass of CO2 produced is 3.626 g, and the mass of H2O produced is 9.897×10-1 g. What is the empirical formula of the compound?
Wednesday, October 1, 2014 at 7:26pm

chemistry
How many milliliters of a substance with a specific gravity of 0.88 would be needed to have 0.75 pounds of it?
Wednesday, October 1, 2014 at 6:49pm

Chemistry
Silicon carbide, commonly known as carborundum, is a very hard and abrasive substance. The compound is prepared by heating silicon dioxide in the presence of graphitic carbon: SiO2(s) + 2C(s) --> SiC(s) + CO2(g) How many grams of silicon carbide can be formed from 20.0 g of...
Tuesday, September 30, 2014 at 9:50pm

Social Studies Help
1.) how were the farms of new England colonies similar to the farms of the up country? a.)They grew rice **** b.)they were plantations c.)they had short growing seasons d.)they were small substance farms 2.)rice grew successfully in south Carolina because slaves ______? a.)...
Monday, September 29, 2014 at 11:50am

Chemistry II
Dr.Bob222 please help given the following table of thermodynamic data substance delta HofF S PCl3 -288.07 kJ/mol 311.7 J/mol-k PCl3 -319.6 kJ/mol 217 J/mol- k determine the normal boiling point (C)of PCl3
Monday, September 29, 2014 at 1:43am

Life orientation
Provide five or more ways in which you critically discuss how lifestyle on substance abuse impact on the teenagers
Sunday, September 28, 2014 at 8:00am

Redox equation
ZnOH4^2- --> ZnO2^2- + 2H2O What is the oxidation agent, reducing agent, substance oxidized, and substance reduced? Well, Zn isn't changed either way, so the OH is the only factor left here... I simplified ZnOH4^-2 --> ZnO2^2- and 2HOH, but still I'm not quite ...
Sunday, September 28, 2014 at 12:46am

chemistry
The complete combustion of salicylic acid releases 21.90 kJ of energy per gram of salicylic acid. In a particular bomb calorimeter (initially at room temperature), the combustion of 0.1182 g of salicylic acid, in the presence of excess oxygen, causes the temperature of the ...
Saturday, September 27, 2014 at 10:00pm

chemistry
The complete combustion of salicylic acid releases 21.90 kJ of energy per gram of salicylic acid. In a particular bomb calorimeter (initially at room temperature), the combustion of 0.1182 g of salicylic acid, in the presence of excess oxygen, causes the temperature of the ...
Thursday, September 25, 2014 at 4:55pm

chemistry
Would a substance with a density of 7.89 kg/dm^3 float on a substance that has a density of 14.2 g/ml?
Tuesday, September 23, 2014 at 9:56pm

Chemistry
Hydrogen cyanide is produced in the following balanced reaction. 2NH3 (g) + 3O2 (g) + 2CH4 (g) → 2HCN (g) + 6H2O (g) Given the following standard heats of formation, calculate the approximate ΔH°rxn of this reaction. Substance ΔHf°(kJ/mol) NH3 -46 CH4 -...
Sunday, September 21, 2014 at 2:38pm

chemistry
At 25∘C the reaction from Part A has a composition as shown in the table below. Substance Pressure (atm) C2H2(g) 4.65 H2(g) 3.85 C2H6(g) 5.25×10−2 What is the free energy change, ΔG, in kilojoules for the reaction under these conditions?
Sunday, September 21, 2014 at 12:53pm

Fluid Mechanics
A cylinder with internal diameter of 5cm and 15 cm high is filled up with an unknown substance. The mass of the cylinder is 4.6 kg which is 300% of the unknown substance mass. Determine the density and the specific gravity of the unknown substance.
Sunday, September 21, 2014 at 7:13am

chemistry
the temperature of a substance ____ as its heat of fusion is added to melt the substance A. increases B. decreases C. remains constant D. fluctuates from rapid increases and decreases I think it's C
Tuesday, September 16, 2014 at 7:34pm

chemistry
25. Which of the two reactions, A or B is a neutralization reaction? Explain why. A. HBr + H2O = Br- = H3O+ B. HClO + NaOH = NaClO + H2O 26. A. Look at the reaction again. when this reaction is reversed. Br- + H3O+ = HBr = H2O what substance is the acid, what is the base. B. ...
Tuesday, September 16, 2014 at 8:15am

Grade 9 Science
In each situation s below , it seems that a new substance may have been produced. Explain why each situation represents a physical change. a) A tailor makes a new suit out of a piece of fabric. b) A chef makes a salad out of lettuce, tomatoes and cucumbers. I really need ...
Sunday, September 14, 2014 at 6:32pm

chemistry
The temperature of a substance ____ as its heat of fusion is added to melt the substance A. increases B. decreases C. remains constant D. fluctuates from rapid increases and decreases
Sunday, September 14, 2014 at 3:51pm

Veterinarian assisted
1. In the __________, an animal patient's hair is clipped and its skin is scrubbed to prepare for surgery.  A. hospital ward  B. surgical suite  C. treatment area  D. grooming area  2. Supervision of the treatment area is usually the responsibility...
Friday, September 12, 2014 at 6:17pm

Physical science
Give one word or term of the following descriptions 1. A reaction that results in the formation of an insoluble salt 2.the process in which ions whithin an ionic substance are separated 3.the positive ion 4.a proton acceptor
Wednesday, September 10, 2014 at 4:13pm

Math
1. If one wishes to accumulate a Php 30,000-fund in 5 years, how much should he deposit now at 18% compounded quarterly? 2. If a bank offers a rate of 4.5% compounded semiannually, how much should you deposit to accumulate Php 50,000 in 15 years 3. Suppose that a particular ...
Tuesday, September 9, 2014 at 9:37pm

chemistry
Use chemical formulas to generate the stoichiometric factor needed to express the results of a gravimetric analysis in terms of the substance on the left if the weighting form is the substance on the right: Sought Weighted I Mg Mg2P2O7 II UO2 U3O6
Tuesday, September 9, 2014 at 12:26pm

chemistry
at a temperature of 5 celsius, 21.5 mg of a non electrolyte is dissolved in enough water to make a 150.0 ml solution. the osmotic pressure of the solution is 0.200 atm. what is the molar mass of the substance dissolved
Monday, September 8, 2014 at 12:05pm

chemistry
calculate the density of a solid if a cube meassuring 2.04cm on one side has a mass of 124g ......................g/cm3 calculate the mass of a cube the same substance measuring 7.97cm on one side enter your answer in scientific notaation ..................x10 g
Sunday, September 7, 2014 at 8:38pm

Exponential decay
Show that if a radioactive substance has a half life of T, then the corresponding exponential decay function can be written as y=y0e^kt
Thursday, September 4, 2014 at 8:39pm

math
Show that if a radioactive substance has a half life of T, then the corresponding constant k in the exponential decay function is given by k=-ln(2)/T I'm confused about how to show that that is true.
Thursday, September 4, 2014 at 7:33pm

chemistry
An unknown substance has a mass of 53.9 g and occupies a volume of 35.4 mL. What is its density in g/mL?
Wednesday, September 3, 2014 at 10:15am

Physics
A 0.250-kg block of a pure material is heated from 20.0°C to 65.0°C by the addition of 4.35 kJ of energy. Calculate its specific heat and identify the substance of which it is most likely composed.
Saturday, August 30, 2014 at 11:02am

algebra
Two Questions: 1) A certain radioactive isotope has leaked into a small stream. 100 days later after the leak 10% of the original amount of the substance. Determine the half-life of this radioactive isotope. 2) During a research experiment, it was found that the number of ...
Thursday, August 28, 2014 at 8:54am

science
Suppose you were balancing a chemical equation that contained the substance sodium nitrate, NaNO3, composed of a sodium ion, Na+1, and a nitrate ion, (NO3)-1. Could you change any of these numbers in order to balance the equation?
Monday, August 25, 2014 at 2:16pm

chemistry
a radioactive substance decays 10% in 5 days. The amount remains after 20 days?
Friday, August 15, 2014 at 9:22am

english
Letter to a Citizen of Kentucky, an excerpt Executive Mansion, Washington, April 4, 1864. A. G. Hodges, Esq., Frankfort, Ky. My Dear Sir: You ask me to put in writing the substance of what I verbally stated the other day, in your presence, to Governor Bramlette and Senator ...
Thursday, August 14, 2014 at 4:36am

physics 2
- Matter is made of charged particles - The motion of charged particles produces electromagnetic waves - Since light is an electromagnetic wave, the color of a substance is ultimately related to the way that charged particles in that substance can move around. Quantum ...
Thursday, August 7, 2014 at 10:56pm

physics 2
- Matter is made of charged particles - The motion of charged particles produces electromagnetic waves - Since light is an electromagnetic wave, the color of a substance is ultimately related to the way that charged particles in that substance can move around. Quantum ...
Thursday, August 7, 2014 at 1:47pm

Biology/Help
Which of the following is the purpose of the waxy substance that builds up in the ear canal? A. Insulating the ear canal B. Trapping and removing debris C. Promoting sound conduction D. Cushioning and stabilizing the pinna I thinks it is B
Wednesday, July 30, 2014 at 12:57pm

Biology
A scientist has noted a possible relationship between a certain chemical substance found in fish and the occurrence of kidney failure in humans. Which of the following preliminary steps should the scientist take before conducting a controlled experiment? A. Establish a cause ...
Sunday, July 27, 2014 at 5:04pm

Physics
The melting point of substance X is -20 degrees Celsius and the boiling point is 90 degrees Celsius. How many Celsius degrees are there between the melting point and the boiling point? 20 degrees Celsius 70 degrees Celsius 90 degrees Celsius 110 degrees Celsius
Thursday, July 17, 2014 at 9:45am

Chemistry
A saturated solution is made by dissolving 0.252 g of a polypeptide (a substance formed by joining together in a chainlike fashion some number of amino acids) in water to give 1.92 L of solution. The solution has an osmotic pressure of 3.69 torr at 25 °C. What is the ...
Tuesday, July 15, 2014 at 11:37am

Chemistry
A saturated solution is made by dissolving 0.325 g of a polypeptide (a substance formed by joining together in a chainlike fashion some number of amino acids) in water to give 1.37 L of solution. The solution has an osmotic pressure of 4.13 torr at 28 °C. What is the ...
Monday, July 14, 2014 at 1:50pm

CHEMISTRY
Can a substance made of zinc be coated by nickel , using nickel nitrate solution ? How ?
Thursday, July 10, 2014 at 6:42am

CHEMISTRY
How many oxidation states Should a substance have at least to undergo Disproportionation reaction ? thanks
Wednesday, July 9, 2014 at 9:31am

CHEMISTRY
A substance contains an element at its probable maximum oxidation number , does this substance have a maximum chance to be an oxidizing agent or have a minimum chance to be a reducing agent ? thank you
Wednesday, July 9, 2014 at 9:26am

statistics
Twelve different video games showing substance use were observed and the duration times of game play (in seconds) are listed below. The design of the study justifies the assumption that the sample can be treated as a simple random sample. Use the sample data to construct and ...
Monday, July 7, 2014 at 3:59pm

CHEMISTRY
The solubility of a substance is 12 g per 100 g water at 20 degree , and is 18 g per 100 g water at 60 degree , what is the mass of the substance can be crystallized in a saturated solution that contain 200 g of water , if the solution cooled from 60 to 20 degree ?
Thursday, July 3, 2014 at 9:12pm

Chemistry
13) Mercury is an environmental pollutant because it can be converted by certain bacteria into the very poisonous substance dimethyl mercury, (CH3)2Hg. This compound ends up in the food chain and accumulates in the tissues of aquatic organisms, particularly fish, which renders...
Tuesday, July 1, 2014 at 1:08pm

Chemistry
Balanced equations..done? Is each reaction a redox reaction? For those reactions that are redox reactions, I must identify the substance being oxidized and the substance being reduced... (a) Zn(s) + CoCl2 (aq) ---> ZnCl2 (aq) + Co(s) (b) HI(aq) + NaOH(aq) ---> H2 O(l) + ...
Sunday, June 29, 2014 at 9:57pm

NEED HELP WITH CALC
Suppose strontium-90 decays at a rate of 2 percent per year. (a) Write the fraction P of strontium remaining, as function of t, measured in years. (Assume that at time t=0 there is 100 % remaining.) Answer: P(t) = (b) Estimate the half-life of strontium. Answer: Hint: Use your...
Friday, June 27, 2014 at 3:17pm

calculus
Suppose strontium-90 decays at a rate of 2 percent per year. (a) Write the fraction P of strontium remaining, as function of t, measured in years. (Assume that at time t=0 there is 100 % remaining.) Answer: P(t) = (b) Estimate the half-life of strontium. Answer: Hint: Use your...
Friday, June 27, 2014 at 2:53pm

Math
Suppose strontium-90 decays at a rate of 2 percent per year. (a) Write the fraction P of strontium remaining, as function of t, measured in years. (Assume that at time t=0 there is 100 % remaining.) Answer: P(t) = (b) Estimate the half-life of strontium. Answer: Hint: Use your...
Friday, June 27, 2014 at 11:11am

Chemistry
When 4.76 g of a solid mixture composed of NH4Cl and CaCl2 was dissolved in 100.0 mL of water, the temperature of the water rose by 4.73°C. How many grams of each substance was in the mixture?
Thursday, June 26, 2014 at 8:11pm

Maths
A radioactive substance decays exponentially in such a way that after 50 years, 60% of the initial amount remains. Find an expression for the quantity remaining after t years.
Sunday, June 15, 2014 at 7:34am

physical sciences
Which substance has the weakest intermolecular force between ethanol,nail polish remover and methylated spirits?
Sunday, June 8, 2014 at 2:19am

English! - Help!
Can someone help me with these? My answer has a "***" next to it. 1. What do you think the narrator of “The Gift of the Magi” considers as having real value? (1 point) the protagonists' hard work the protagonists' wisdom the protagonists' ...
Tuesday, June 3, 2014 at 10:36am

science
what is a form of energy that is always transferred from a warmer substance to a cooler one?
Wednesday, May 28, 2014 at 12:32am

English III
Letter to a Citizen of Kentucky, an excerpt Executive Mansion, Washington, April 4, 1864. A. G. Hodges, Esq., Frankfort, Ky. My Dear Sir: You ask me to put in writing the substance of what I verbally stated the other day, in your presence, to Governor Bramlette and Senator ...
Saturday, May 24, 2014 at 8:26pm

Science(chemistry)
Give one word/term for the following descriptions during this type of reaction,the appearance,colour or shape of a substance is changed
Wednesday, May 21, 2014 at 2:58pm

Chemistry
What is the specific heat of a substance if 2100 J is required to raise a 312 g sample by 15 degrees Celsius? So I use the q = mcΔT formula 2100J = (312 g)c(85 °C - 15 °C) I'm not sure if I did it right.
Tuesday, May 20, 2014 at 7:11pm

Chemistry
1. Sugar can be dissolved in water because of the presence of bonds between _______ in its molecule. 2. If the maximum amount of a compound that can dissolve in 100 mL of water is 22 g, then a solution of 20 g of that substance in 100 mL of water is said to be _______. 3. A ...
Tuesday, May 20, 2014 at 5:38pm

Chemistry
1. Sugar can be dissolved in water because of the presence of bonds between _______ in its molecule. 2. If the maximum amount of a compound that can dissolve in 100 mL of water is 22 g, then a solution of 20 g of that substance in 100 mL of water is said to be _______. 3. A ...
Tuesday, May 20, 2014 at 4:38pm

science
Ions are electrically charged particles that are formed when certain compounds are dissolved in water. These solutions will conduct electricity. The Swedish scientist Svante Arrhenius coined the term ion (which means wanderer) to explain why solutions of electrolytes will ...
Thursday, May 15, 2014 at 8:45pm

SCI 275
Resource: Chapter 18 Select one case study or an example, from Chapter 18 that describes the impacts of a toxic substance on human health. Answer the following questions based on the risk assessment principles presented in Ch. 18, and in Figure 18-10 in section 18.7 Risk and ...
Thursday, May 15, 2014 at 1:44am

SCI 275
Resource: Chapter 18 Select one case study or an example, from Chapter 18 that describes the impacts of a toxic substance on human health. Answer the following questions based on the risk assessment principles presented in Ch. 18, and in Figure 18-10 in section 18.7 Risk and ...
Thursday, May 15, 2014 at 1:25am

Math-Exponential Decay
A lab technician had 58 grams of a radioactive substance. Ten days later, only 52 grams remained. Find the half-life of the radioactive substance.
Monday, May 12, 2014 at 1:45am

Chemistry
So I am trying to understand in molecular terms the solubility of NaCl in water. So there are intramolecular forces that are mostly ionic between the ions, creating this partial positive, partial negative substance. And the intermolecular forces are also ionic. Ionic forces ...
Thursday, May 8, 2014 at 7:54pm

URGENT Physics help
An attractive force of 7.2 N occurs between two point charges that are 0.10 m apart. If one charge is 4.0 µC, what is the other charge? (µC = 1.0 × 106 C) (Points : 3) 1.0 µC 2.0 µC +1.0 µC +2.0 µC Which substance is most easily ...
Wednesday, May 7, 2014 at 11:09am

Calculus
Poli 761 (a fictitious substance) decays by about 7% every day. How much of a 88 pound sample remains after 9 days?
Tuesday, May 6, 2014 at 2:22pm

physics
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 substance have very different melting temperatures and densities. The unknown substance is most likely a
Tuesday, May 6, 2014 at 11:34am

chemistry
Some of the substance commonly used in stomach antiacid are MGO,MG(OH)2,AL(OH)3. Which of these substance will neutralize thr greatest amount of 0.10M HCl per gram?
Monday, May 5, 2014 at 1:19pm

Chemistry
Which substance has the higher entropy? a.) a sample of pure silicon (to be used in a computer chip)or a piece of silicon containing a trace of another element such as boron or phosphorus b.) O2(g) at 0 degrees C or O2(g) at -50 degrees C c.) I2(s) or I2(g), both at room ...
Wednesday, April 30, 2014 at 2:35pm

Chemistry
what is the specific heat of an unknown substance of 2000 j of energy required to raise the temperature of 4 grams of substances 5 degrees celsius
Wednesday, April 30, 2014 at 11:54am

Chemistry
1) In the reaction NaOH + H2O --> Na+ + OH-, sodium hydroxide is the: A) Lewis acid B) Brønsted-Lowry acid C) Arrhenius base D) Amphoteric substance E) None of the above (I think it's C) 2) The conjugate acid of the sulfide ion is: A) S^2- B) HS- C) H2S D) H3S+ E...
Tuesday, April 29, 2014 at 9:21pm

Chemistry
What is the specific heat of an unknown substance if a 2.45g samples releases 12.9 cal as its temperature changes from 25.1 degrees C to 20.1 degrees C?
Sunday, April 27, 2014 at 8:15pm

Chemistry
Predict how the entropy of the substance is affected in the following processes: a) O2 (g,200 kPa, 300k) --> O2 (g, 100, 300k) b)Br2 (l, 1 bar, 25 degree C) --> Br2 (g, 1 bar, 25 degree C) C)Fe (s, 1 bar, 250 degree C)--> Fe(s, 1 bar, 25 degree C) will entropy either ...
Sunday, April 20, 2014 at 12:47am

chemistry
a 0.0500 mol sample of a nutrient substance is burned in a bomb calorimeter containing 2.00 x 10^2g H2O. If the formula weight of this nutrient substance is 114g/mol, what is the fuel value (in nutrient Cal) if the temperature of the water increased 5.70C
Tuesday, April 15, 2014 at 11:40pm

chemistry
Determine the mole fraction of each substance in a solution containing 36.0g H2O and 46g glycerin, C3H5(OH)3
Tuesday, April 15, 2014 at 3:36pm

accounting
Wendell Corporation exchanged an old truck and $25,500 cash for a new truck. The old truck had a book value of $6,000 (original cost of $25,000 less $19,000 in accumulated depreciation) and a fair value of $7,700. Required: 1. Prepare the journal entry to record the exchange. ...
Monday, April 14, 2014 at 9:40pm

English III
Lesson 6.07 Letter to a Citizen of Kentucky, an excerpt Executive Mansion, Washington, April 4, 1864. A. G. Hodges, Esq., Frankfort, Ky. My Dear Sir: You ask me to put in writing the substance of what I verbally stated the other day, in your presence, to Governor Bramlette and...
Thursday, April 10, 2014 at 12:37pm

Calculus Help Please!!!
A radioactive substance has a half-life of 4 days. Suppose we have 800 mg of this substance. a) Find the equation of the mass remaining after t days. Use the exact value for k not a decimal approximation. b) Rounding your answer to the nearest tenth of a mg, find the mass ...
Wednesday, April 9, 2014 at 12:23pm

Chemistry Help Please!!!
A radioactive substance has a half-life of 4 days. Suppose we have 800 mg of this substance. a) Find the equation of the mass remaining after t days. Use the exact value for k not a decimal approximation. b) Rounding your answer to the nearest tenth of a mg, find the mass ...
Monday, April 7, 2014 at 11:26pm

Math
Phosphorus-32 (P-32) has a half-life of 14.2 days. If 200 g of this substance are present initially, find the amount Q(t) present after t days. (Round your growth constant to four decimal places.) How fast is the P-32 decaying when t = 21.5? (Round your answer to three decimal...
Monday, April 7, 2014 at 7:49pm

math
Phosphorus-32 (P-32) has a half-life of 14.2 days. If 200 g of this substance are present initially, find the amount Q(t) present after t days. (Round your growth constant to four decimal places.) How fast is the P-32 decaying when t = 21.5? (Round your answer to three decimal...
Monday, April 7, 2014 at 5:15pm

Math
Phosphorus-32 (P-32) has a half-life of 14.2 days. If 200 g of this substance are present initially, find the amount Q(t) present after t days. (Round your growth constant to four decimal places.) How fast is the P-32 decaying when t = 21.5? (Round your answer to three decimal...
Sunday, April 6, 2014 at 8:59pm

Math
A radioactive substance decays according to the formula Q(t) = Q0e−kt where Q(t) denotes the amount of the substance present at time t (measured in years), Q0 denotes the amount of the substance present initially, and k (a positive constant) is the decay constant. (a) ...
Sunday, April 6, 2014 at 8:54pm

Math
A radioactive substance decays according to the formula Q(t) = Q0e−kt where Q(t) denotes the amount of the substance present at time t (measured in years), Q0 denotes the amount of the substance present initially, and k (a positive constant) is the decay constant. (a) ...
Saturday, April 5, 2014 at 10:05pm

math
Phosphorus-32 (P-32) has a half-life of 14.2 days. If 200 g of this substance are present initially, find the amount Q(t) present after t days. (Round your growth constant to four decimal places.) How fast is the P-32 decaying when t = 21.5? (Round your answer to three decimal...
Saturday, April 5, 2014 at 9:58pm

science
The type of heat transfer called convection happens as a result of: a. electromagnetic waves b. the direct contact of particles in a substance c. the actual motion of a fluid in the form of currents d. All of the above I think it's C.
Thursday, April 3, 2014 at 9:36pm

chemistry
Based upon the intermolecular forces present, rank the following substances according to the expected boiling point for the substance: MgF2, H2O, HCl, N2
Thursday, April 3, 2014 at 1:59pm

science
PLEASE HELP GUYS An ideal gas for which Cv = 3R/2 is the working substance of a Carnot engine. During the isothermal expansion, the volume doubles. The ratio of the final volume to the initial volume in the adiabatic expansion is 5.7. The work output of the engine is 9 x 105 J...
Thursday, April 3, 2014 at 9:44am

science
An ideal gas for which Cv = 3R/2 is the working substance of a Carnot engine. During the isothermal expansion, the volume doubles. The ratio of the final volume to the initial volume in the adiabatic expansion is 5.7. The work output of the engine is 9 x 105 J in each cycle. ...
Thursday, April 3, 2014 at 9:43am

science
1.   Use the diagram to answer question 1. description: particles have enough energy to break free from each other and can move around freely; particles spread out in different directions  sketch: What kind of substance is described?  (1 point) solid ...
Monday, March 31, 2014 at 2:24pm

Biology (fetal pig)
What substance passes through the glottis? [Is it Air??] What substances passes through the esophagus? [I don't know if this is food] please help. thanks
Friday, March 28, 2014 at 10:11pm

Chemistry
I got think I got the following questions almost figured, but I just want someone to make sure that I am correct. 1) The whole experiment involves using the ideal gas law to predict the molar mass of an unknown liquid. The formula is molar mass of liquid = gR(0.0821)T(...
Friday, March 28, 2014 at 1:42pm

chemistry
A solution is made with 2.0 g of substance that cause the temperature of 75.0 g of water to decrease from 23.1 C to 18.7 C. The specific heat of water is 4.18 J/g C.
Wednesday, March 26, 2014 at 9:56pm

Science asap thankies :)
What would a permanently magnetic substance be called? I cant remember what my teacher called it, it was a short first word then magnet.. sorry and thanks!
Tuesday, March 25, 2014 at 10:39pm

Statistics
Twelve different video games showing substance use were observed and the duration times of game play ( in seconds) are listed below. The design of the study justifies the assumption that the sample can be treated as a simple random sample. use the data to construct a 95% ...
Monday, March 24, 2014 at 8:34am

science
what is the substance that melts at 10°C?
Saturday, March 22, 2014 at 3:37pm

scholarship essay edit
can someone edit this? Throughout my life’s journey, I have come to attain two true passions - the first one being English studies. Since the very dawn of childhood, I have been known to bleed the calligraphic content of Gary Soto's brilliant poetry and breathe the ...
Friday, March 21, 2014 at 1:23pm

TO: DrBob222 science
1. Write the chemical formula for each of the following acids: a.) hydrocyanic acid b.) oxalic acid c.) chlorous acid d.) nitric acid 2. Write the acid name or chemical formula for each of the following: a.) HBr b.) sulfurous acid c.) HClO4 D.) phosphoric acid 3. First ...
Thursday, March 20, 2014 at 4:55pm

Physical Science
When 8 kcal of heat is added to 2.4 kg of a substance, its temperature increases 23 C°. What is the specific heat of the substance?
Monday, March 17, 2014 at 12:30pm

Physical Science 9
a substance made of two or more elements chemically combined in a set ratio or proportion is called what
Sunday, March 16, 2014 at 2:41pm

Science
a substance made of two or more elements chemically combined in a set ratio or proportion is called what
Sunday, March 16, 2014 at 1:14pm

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