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October 21, 2014

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Recent Homework Questions About Substance Abuse

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chemistry
In a chemical reaction, exactly 2 mol of substance A react to produce exactly 3 mol of substance B. How many molecules of substance B are produced when 26.5 g of substance A reacts? The molar mass of substance A is 21.9 g/mol. Step 1: Convert the mass of A to moles. Step 2: ...
Tuesday, September 24, 2013 at 10:07pm

Chemistry
A sample of 2.08 grams of Z is dissolved into 500 grams of water which is in a styrofoam coffee cup. The temperature is monitored and is found to rise from 25.682◦C to 25.899◦C. What is ∆Hsolution for substance Z? Assume no heat is lost/gained by the ...
Saturday, September 21, 2013 at 12:13pm

Chemistry
A solution containing 0.750g of an unknown substance in 30.0g of cyclohexane was found to freeze at 3.1 degree Celsius. What is the molar mass of the unknown substance?
Thursday, September 19, 2013 at 12:42pm

Chemisty
Given the data in the table below, ∆Horxn for the reaction 3NO2(g) + H2O(l) → 2HNO3(aq) + 3NO(g) is __________ kJ. Substance ∆Horxn (kJ/mol) H2O(l)= -286 NO(g)= 90.0 NO2(g)= 34.0 HNO3(aq)= -207 NH3(g)= -46.0 A) -140 B) -508 C) -64 D) 140 E) 64
Tuesday, September 17, 2013 at 12:59am

Science/ Biol PLEASE HELP
microscopic examination of a tissue reveals an open framework of fibers with a large volume of fluid ground substance and elastic fibers. this tissue would most likely have come from the? A. Inner wall of blood vessel B. lungs C. Spleen D. Tissue E. bony socket of eye
Monday, September 16, 2013 at 5:08pm

BIOL HELP PLEASE!
microscopic examination of a tissue reveals an open framework of fibers with a large volume of fluid ground substance and elastic fibers. this tissue would most likely have come from the? A. Inner wall of blood vessel B. lungs C. Spleen D. Tissue E. bony socket of eye
Monday, September 16, 2013 at 3:41pm

Science
Helium doesn't react with any other substance. Is it accurate to say that helium has no chemical properties? Explain. Please help because I'm not sure of the answer. Thank you.
Friday, September 13, 2013 at 11:15pm

History
Helium doesn't react with any other substance. Is it accurate to say that helium has no chemical properties? Explain. Please help because I'm not sure of the answer. Thank you.
Friday, September 13, 2013 at 11:13pm

Life Science
Im doing 7th grade life science. (im 13.) I need to make sure my answers are right because my homework is being graded. I think i have most of them right but we'll see. I DO NOT want you to tell me the answer to my homework. I just want you to tell me if its wrong or not. ...
Friday, September 13, 2013 at 8:42pm

Chemistry
Convert 6.42x10^23 atoms a pure substance to moles of that substance. That is all it says. Please help. Thank you.
Thursday, September 12, 2013 at 3:26pm

Math, science
assume the substance has a half-life of 12 years and the initial amount is 133 grams. How long will it be until only 40 % remains?
Tuesday, September 10, 2013 at 8:36pm

Physical Science
a student is given a 10 gram sample of gold that has a density of 19.32g/cm3. The student is then given a 5 gram sample of an unknown substance and told the density of the unknown substance is 19.32g/cm3. What is the unknown substance
Tuesday, September 10, 2013 at 6:19pm

Physics 2
An unknown substance has a mass of 0.125 kg and an initial temperature of 98.0°C. The substance is then dropped into a calorimeter made of aluminum containing 0.285 kg of water initially at 30.0°C. The mass of the aluminum container is 0.150 kg, and the temperature of ...
Monday, September 9, 2013 at 11:40pm

algebra
Julie has 250 grams of a radioactive substance. The substance decays every hour. How long will it take until she has 20 grams of the substance left?
Monday, September 9, 2013 at 4:15pm

biology
Methyl mercury is a toxic substance that can harm the nervous system. Some fish are contaminated with high levels of methyl mercury. In many places, these fish are an important food source. Experiments are being conducted to determine how many meals of contaminated fish can be...
Friday, September 6, 2013 at 6:07pm

Physics
A radioactive substance decays from 2.0kg to 1.6kg in 156 days. How long would it take to decay to 1.1kg?
Wednesday, August 7, 2013 at 9:46am

Physics
A radioactive substance decays from 2.0kg to 1.6kg in 156 days. How much will be left after 201 days?
Wednesday, August 7, 2013 at 9:45am

Physics
A radioactive substance decays from 2.0kg to 1.6kg in 156 days. What is the decay constant and the half life of the substance?
Tuesday, August 6, 2013 at 11:28pm

physics
Two bars of identical mass are at 30 °C. One is made from glass and the other from another substance. The specific heat capacity of glass is 840 J/(kg · C°). When identical amounts of heat are supplied to each, the glass bar reaches a temperature of 95 °C, ...
Thursday, July 25, 2013 at 1:59pm

science
a substance was found to have a renal clearance that was lower than the glomerular filtration rate. In reguards to this substance what major processes of urine formation are certain to have occured. Explain 3 major urine formation processes either occurred or not
Tuesday, July 23, 2013 at 4:55pm

SCIENCE
The size, mass, and arrangement of atoms affect the density of a substance. If a substance has a low density, what can you guess about the size, mass and arrangement of the atoms that make up that substance?
Tuesday, July 16, 2013 at 8:46pm

life orientation
substance abuse in 10-15 lines critically discss 5 ways in which the human or environmental problem impacts on the community.
Sunday, July 14, 2013 at 6:58am

Biology
Will you please check my answers? 1. Single-celled organisms that do not have a membrane-bound nucleus are called A. organelles. B. prokaryotes. C. Golgi bodies. D. eukaryotes. 2. In cells, a form of active transport is A. a sodium-potassium pump. B. osmosis. C. facilitated ...
Friday, July 12, 2013 at 6:40pm

English
1.The psychology of children coping with sexual abuse 2.Adolescents who commit suicide 3.Self-inflicted pain as a response to grief/abuse Throughout the years, many young women have always struggled for freedom to deal with the problems they have. Such difficulties, including ...
Friday, July 5, 2013 at 8:27pm

Chemistry!!!
1.)The silica that makes up the stationary phase in TLC chromatophraphy is more polar than the mobile phase. What then might the relative positions of the analgesics on the developed TLC plate tell you about the polarity of these molecules? Does this match the expectations ...
Monday, July 1, 2013 at 10:33am

Chemistry
The half-life for the second-order reaction of a substance A is 58.2 s when A0 = 0.63 mol L-1 Calculate the time needed for the concentration of A to decrease to the following values. (a) one-third of its original value (b) one-sixth of its original value (c) one-seventh of ...
Friday, June 28, 2013 at 4:30pm

math
A researchr assistant made 160mg of a radioactive, and found that there was only 20mg left after 45hours. a) What is the half-life of this substance? b) Write a function to represent the amount of substance left after x hours c) If the researcher kew he needed 100mg of the ...
Sunday, June 23, 2013 at 12:30pm

Chemistry
A total charge of 96.5 kC is passed through an electrolytic cell. Determine the quantity of substance produced in each of the following cases. (a) the mass (in grams) of silver metal from a silver nitrate solution (b) the volume (in liters at 273 K and 1.00 atm) of chlorine ...
Friday, June 21, 2013 at 8:59pm

life orientation
critically discuss 5 ways in which substance abuse can have an impact on human & environmental factor?
Monday, June 17, 2013 at 2:36pm

chemistry
Ok, so using Le Chatelier's Principle If you add heat to an exothermic reaction, the equilibrium will shift to the left. If you remove heat to an exothermic reaction, the equilibrium will shift to the right. What is it for an ENDOTHERMIC reaction? If you add a substance, ...
Tuesday, June 4, 2013 at 11:56pm

chemistry
for each pair of substance listed below identify one with lower boiling point
Friday, May 31, 2013 at 9:56am

hernandez
find the molar enthalpy of vaporization for a substance, given that 3.21 mol of the substance absolve 28.4 kj of energy as heat when the substance changes from liquid to gas? show the work
Thursday, May 30, 2013 at 9:38pm

Chemistry
BaSO4(s)__><--- Ba2+(aq) + SO42−(aq) Adding what substance produces more SO4^2-??? This was a question, that had options of 1. SO4^2- 2. Ba2+ 3. BaSO4(s) 4. and i think a compound with NH in it Thank you
Wednesday, May 29, 2013 at 11:03pm

Physics
A substance is heated from –12.0oF to 150.0oF. What is its change in temperature on (a) the Celsius scales,(b) the Kelvin scales
Tuesday, May 28, 2013 at 6:25am

science
A chemical reaction in which to or more substance undergo a chemical union to form more complex substance is a what reaction?
Monday, May 27, 2013 at 6:28pm

L.o
Human or environmental problem under substance abuse. The impacts
Sunday, May 26, 2013 at 2:23pm

life orientation
provide recommendations on how to address substance abuse
Tuesday, May 21, 2013 at 12:27pm

TEACHER AIDE,CHILDREN, FAMILIES, SOCIETE
1. Larry is a very aggressive four-year-old child. He watches many television programs that contain violence. It’s most likely that A. he will become overactive. C. his behavior won’t change. B. he will become depressed. D. his behavior will become more aggressive. 2...
Saturday, May 18, 2013 at 5:00pm

life orientation
in 10-15 lines critically discuss 5 ways in which substance abuse impacts on the community.
Tuesday, May 14, 2013 at 9:55am

life orientation
describe the substance abuse of both legal and illegal drogs among the youth and explain the the factors that contribute to the disease.
Monday, May 13, 2013 at 9:24am

Chemistry
If I used 100% larger sample mass of an unknown substance what effect would that have on the empirical formula that would be obtained?
Monday, May 13, 2013 at 2:20am

science
A form of energy that is always transferred from a warmer substance to a cooler one.
Sunday, May 12, 2013 at 9:04pm

Algebra 2
A 14 gram sample of a substance that's used to preserve fruit and vegetables has a k-value of 0.1092. Find the substance's half-life, in days. Round your answer to the nearest tenth.
Tuesday, May 7, 2013 at 2:11pm

Science
Please check my answers (at the bottom) with these questions. 1. An apple quickly changes color when exposed to air. This demonstrates a ________. (1 point) physical property chemical property physical change all of the above 2. When a chunk of dry ice is at room temperature, ...
Tuesday, May 7, 2013 at 12:22pm

Chemistry
A substance releases 496kJ of heat as 2.60 moles condense from a gas into a liquid. What is the molar heat of vaporization of the substance?
Tuesday, May 7, 2013 at 12:14pm

Pre-Algebra
Tempurature of substance increases by 10°C in 5 minutes. Write it as a unit rate. Then convert it to degrees Fahrenheit per hour.
Monday, May 6, 2013 at 7:46pm

life orientation
In 10-15 lines critically discuss 5 ways in which the human or environmental problem impact on the community in related to substance abuse
Monday, May 6, 2013 at 6:00pm

substance
10-15 lines critically discuss 5 ways in which the human problem impacts on the community
Friday, May 3, 2013 at 2:52am

PHYSICS!
The quantity of heat that changes the temperature of a mass of a substance is given by , where is the specific heat capacity of the substance. For example, for , . And for a change of phase, the quantity of heat that changes the phase of a mass is , where is the heat of fusion...
Thursday, May 2, 2013 at 2:25pm

Life orientation
Recommendations on how to address substance abuse
Thursday, May 2, 2013 at 12:15pm

Life orientation
Five ways in wich substance abuse problem impact on the communities
Thursday, May 2, 2013 at 12:10pm

Chemistry
I just to know how to identify the substance that is reduced, the substance that is oxidized, the oxidizing agent and the reducing agent in each reaction. As (s) + ClO3-(aq) → H3AsO3 (aq) + HClO(aq) CN-(aq) + MnO4-(aq) → CNO-(aq) + MnO2(s) C2H5OH + MnO4- → ...
Tuesday, April 30, 2013 at 11:01pm

chemistry: please check answers.
1. How many valence electrons does a carbon atom have? A) 1 B) 2 C) 3 D) 4<<my answer 2. How many double covalent bonds are in an alkane? A) 0<<my answer B) 1 C) 2 D) 3 3. What is the general formula for a straight-chain alkane? A) CnHn B) CnHn+2 C) CnH2n D) CnH2n+...
Tuesday, April 30, 2013 at 10:30am

chemistry
Pipette 3 drops of oil into a test tube of water and shake. Describe what takes place and why? - Would it be the oil settles at the top of the water, because the oil is less dense, and its a non-polar substance, so it doesn't mix with a polar substance (water). Add 1 scoop...
Tuesday, April 30, 2013 at 12:28am

Physics
A bullet is made up of what substance?
Monday, April 29, 2013 at 5:52am

Physics
A bullet is made up of what substance?
Monday, April 29, 2013 at 5:51am

Physics
A bullet is made up of what substance?
Monday, April 29, 2013 at 5:51am

Physics
A bullet is made up of what substance?
Monday, April 29, 2013 at 5:20am

algebra
Andrew measures they 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. use your equation...
Friday, April 26, 2013 at 11:11pm

Science
During an experiment, you find that you can dissolve 3.6 g of a substance in 300 mL of water at 25°C. How much of the substance would you predict that you could dissolve in 600 mL of water at the same temperature? Can somebody help me with this? I don't get it.
Thursday, April 25, 2013 at 11:26am

Life orientation
Describe the life style disease/behaviour and explain 5 or more factors that contribute to the disease of substance abuse of both legal and illegal drugs among the youth
Thursday, April 25, 2013 at 10:00am

physics
Objects A and B have the same mass of 3.4 kg and are at their melting points. They melt when 4.9 × 104 J of heat is added to A and when 11 × 104 J is added to B. (a), (b) Determine the latent heat of fusion for the substance from which each object is made. (c) Find...
Wednesday, April 24, 2013 at 1:25pm

life orientation
Substance abuse of both legal and illegal drugs among the youth
Tuesday, April 23, 2013 at 3:13am

Life Orientation
Explain 5(or more)factors that contribute to the substance abuse of both Legal and Illegal drugs among the youth
Sunday, April 21, 2013 at 11:10am

sew
A chemical substance that causes dyes to set is called?
Sunday, April 21, 2013 at 10:40am

ELECTROLYSIS OF ZnI2
ELECTROLYSIS OF ZnI2 if you have done this experiment Please help me answer these questions as i missed the last half of my chem lab today. 1. What color change occurred when the wire is first heated. -next question is... What is the identity of the liberated metal? 2. what ...
Thursday, April 18, 2013 at 7:09pm

chemistry
What is the specific heat of an unknown substance if a 2.53 g sample releases 13.1 cal as its temperature changes from 25.5°C to 21.3°C?
Wednesday, April 17, 2013 at 4:08pm

Grd 12 life orientation
Describe the life style behaviour and explain 5 factors that contribute to the substance abuse of both legal and illegal drugs among the youth
Wednesday, April 17, 2013 at 2:39pm

life orientation
in 15 lines critically discuss 5 ways in which the human or environmental problem impacts on the community in substance abuse
Wednesday, April 17, 2013 at 11:09am

chemistry
What is the specific heat of an unknown substance if a 2.31 g sample releases 12.5 cal as its temperature changes from 24.9°C to 20.7°C? Please explain ans show steps.
Tuesday, April 16, 2013 at 7:26pm

Chemistry
Substance X (MW=356gm) is a weak acid. Its Ka is 1.7x10^-3. Calculate pH of725ml of the following solutions: a)Containing 0.187 mol of substance x b)containing 127gm of Substance x I have been trying to figure this problem out for hours now and do not get it. Please help me ...
Tuesday, April 16, 2013 at 11:54am

science
Why is it difficult to distinguish between some pure substances and solutions? What methods can overcome this to define if either it is a pure substance or solution?
Sunday, April 14, 2013 at 10:56pm

Chemistry
how to find the mass of the substance if the only given is the molar mass???
Sunday, April 14, 2013 at 1:11pm

Life orientation
Which institution or organisation involved in supporting or giving redress to substance abuse?
Sunday, April 14, 2013 at 9:52am

AP CHEM HELP
When NH3 is added to solid Hg2Cl2, some of the mercury ions are oxidized and some are reduced. A reaction where the same substance is both oxidized and reduced is called a disproportionation reaction. Write equations for each of these half-reactions. HELP
Tuesday, April 9, 2013 at 7:03pm

science
1. _____ is the process by which food is broken down so that nutrients can be used by the body. (1 point) Absorption Digestion Elimination Ingestion 2. What type of digestion takes place in the mouth? (1 point) chemical mechanical chemical and mechanical neither chemical nor ...
Monday, April 8, 2013 at 7:51pm

Chemistry
H2C2O4.2H2O(s) is primary standard substance. 2.3688g of oxalic acid hydrate were completely neutralized by 42.56ml of NaOH solution. Calculate the molar concentration of the NaOH solution. Write the balanced equation for the reaction.
Monday, April 1, 2013 at 8:08pm

Grade 12 Life orientation
Critically discuss 5 ways in which lifestyle/behaviour substance of both legal and illegal drugs impact on the teenagers?
Saturday, March 30, 2013 at 12:26pm

7th Grade Sience
1. A person's belief that he or she needs a drug to feel good or function normally (1 point) addiction psychological dependence emphysema tolerance 2. A large, dome-shaped muscle below the lungs (1 point) trachea alveoli diaphragm emphysema 3. Smoke that is inhaled and ...
Thursday, March 28, 2013 at 2:46pm

science
Monique heated the black substance with some corbon. Copper was formed. what are all the elements in the blue crystals ?
Tuesday, March 26, 2013 at 5:56am

Biology
Eutrophication refers to 1. the concentration of a toxic substance in the tissues of organisms. 2. depletion of mineral resources as a result of leaching. 3. the warming of the earth’s surface. 4. the damage to the ozone layer that protects the earth from UV light. 5. ...
Tuesday, March 19, 2013 at 6:24pm

calculus
assume that during the first 3 minutes after a foreign substance is introduced into the blood,the rate R'(t) at which new antibodies are produced(in thousands of antibodies per minute) is given by R'(t)=t/(t^2+1) where t is in minutes.find the total quantity of new ...
Tuesday, March 19, 2013 at 3:06am

science
A substance is added to the solution of Barium sulphate,yellow precipitate is formed.What is that substance?
Wednesday, March 13, 2013 at 4:57am

chemistry
Plastic articles can be chromium-plated by coating them with thin layer of graphite paste,placing them in a bath of aqueous chromium(III) sulphate and electroplating. a)Suggest a reason why the article is first coated with graphite. b)what substance could be used for the other...
Sunday, March 10, 2013 at 6:39am

Chemistry
Recall that all aqueoous solutions contain_____. Water can also undergo ____. This process is called the ______of water. The reaction can be written as: Notice the double arrow in the reaction. This indicates that the reaction is_____. However, only a tiny fraction of water ...
Thursday, March 7, 2013 at 9:53pm

Chemistry
These blanks I REALLLY need your help. Our teacher gave the teaching job to this other I think coop student who wants to be a teacher to teach for a day but I| seriously don't understand anything she said..in short I don't have anyyy clue about this. So please help me...
Thursday, March 7, 2013 at 9:08pm

Chemistry
Can someone check my answers please? I had specific trouble with 7, 13, and 27 (I'm pretty sure my other answers are correct; some reassurance would be nice though). And I have a small question about 8. 1. The ΔHf of an element in its standard state is defined to be 0...
Sunday, March 3, 2013 at 6:05pm

science
A substance has a mass of 12.5 grams and a volume of 9.8 ml.Will the object sink or float in water?
Friday, March 1, 2013 at 11:51am

Chemistry
A 1.065-g sample of an unknown substance is dissolved in 30.00 g of benzene; the freezing point of the solution is 4.25 degrees C. The compound is 50.69% C, 4.23% H, and 45.08% O by mass. Info you might need on benzene: Normal Freezing point,degrees C: 5.53 Kf, degrees m^1: 5....
Monday, February 25, 2013 at 2:19am

Chemistry
I need help in solving this problem: A certain substance has a heat of vaporization of 42.46 kJ/mol. At what Kelvin temperature will the vapor pressure be 5.00 times higher than it was at 291 K? I know that I have to use the Clausius-Clapeyron equation, but what would I be ...
Sunday, February 24, 2013 at 3:27pm

chemistry
sometimes,instead of percentage composition, you will have the composition of a mass sample. using the actual mass of the sample, determine the empirical formula for compounds that have the following analyses. b. a 13.07g sample of an unknown substance is composed of 9.48g of ...
Saturday, February 23, 2013 at 7:34pm

chemistry
difference between solution and pure substance
Thursday, February 21, 2013 at 10:47pm

English
This is a chemistry lab report, but I was wondering if someone could edit the grammar and look at the sentence structure, etc. I know it's really long and boring, but even if you just look over a bit of it, I would really appreciate it. And I'm assuming you don't ...
Thursday, February 21, 2013 at 6:16pm

Physics2
"The heat engine uses 1.00x10^-2 mol of a diatomic gas as the working substance. Determine the temperatures at the 3 points." From 1-2, it's an adiabatic process and the constants are (P)(V^(7/5)) or (T)(V^(2/5)). From 2-3, it's an isobaric process with V/T ...
Thursday, February 21, 2013 at 2:09am

gen. chemistry
an unknown solid substance weighs 121g. calculate the specific heat if 425.2 cal raise the temperature of the solid from 24.0 degrees C to 55.7 degrees C.
Wednesday, February 20, 2013 at 4:36pm

Chemistry (DrBob222)
Hi, here's my (almost) 2-paged lab report introduction (hopefully you remember it from yesterday). I went to class today, and actually a lot of my other classmates' introductions were over 2 pages! Now I'm feeling kind of insecure about mine, and I'm not even ...
Tuesday, February 19, 2013 at 5:39pm

science
A 10g sample of radioactive substances is lift to decay for five half-lives. How much of the radioactive substance remains?
Tuesday, February 19, 2013 at 3:51pm

Chemistry
If I have 50 mL of Lead(II) Nitrate, it is possible for me to calculate how many mole is 1 mL of the substance? Thanks
Sunday, February 17, 2013 at 7:19pm

Physics
Calculate the net charge on a substance consisting of a combination of 7.5 multiplied by 1013 protons and 3.5 multiplied by 1013 electrons. Answer in units of C
Sunday, February 17, 2013 at 10:39am

Physics
A certain substance has a dielectric constant of 2.8 and a dielectric strength of 18.0 MV/m. If it is used as the dielectric material in a parallel-plate capacitor, what minimum area should the plates of the capacitor have to obtain a capacitance of 7.00×10-8 F and to ...
Thursday, February 14, 2013 at 9:44pm

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