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August 28, 2015

Homework Help: Health: Substance Abuse

Recent Homework Questions About Substance Abuse

AP Chemistry
Calculate ∆G0 for the following reaction. 4XY + 3Z2−→2Z3X2+ 2Y2 Substance ∆H0f S0kJ/mol J/mol·K XY 205.0 75.0 Y2 −82.0 37.0 Z2 −25.0 78.0 Z3X2 −245.0 137.0 Answer in units of kJ/mol
Tuesday, October 29, 2013 by Gabriella

Organic Chemistry
I want to confirm some things on solubility and boiling points(they might be right or wrong): - If a substance is soluble in water then it also has a high boiling point - If a substance has a high intermolecular force then it also has a high boiling point - Shorter ...
Tuesday, October 29, 2013 by rinchan

Science
Please help !!! A student wanted to determine the density of an object made of an unknown substance. She found the mass of the object was 335g. Then she did water displacement to determine the objects volume. The initial volume of the water was 50.0 mL. With the object ...
Sunday, October 27, 2013 by Cherie

chemistry
A solid sample is 81.0 g sodium per 1,000,000. g substance, and contains 1.92 × 10 ^21 sodium atoms, calculate the mass (g) of the sample.
Sunday, October 27, 2013 by Ale

Science
What is a substance that cannot be separated into simpler substances by physical or mechanical methods such as filtering, boiling, or sifting?
Friday, October 25, 2013 by Jeff

science
I am still new to physics, so I'm having a rough time. When a 1kg metal pan containing 1kg of cold water is removed from a refrigerator onto a table which absorbs more heat from the room, the pan or the water? I thought it was the water, because I thought I read that water...
Friday, October 25, 2013 by bbragg

Chemistry
what's the density of a cube of an unknown substance if mass is 45.2g and the side of a cube is 3.2cm?
Thursday, October 24, 2013 by Nick

Biology
What happens when a substance dissolves in the watery solution outside of a cell and equilibrium is disrupted. a. Water from the cell will move into the solution b. water from the solution will move into the cell c. the pores in the cell membrane will become clogged with the ...
Thursday, October 24, 2013 by David

Science
Suppose that 9 grams of a certain substance lost 17.5 calories of heat when the temperature decreased from 70 degrees Celsius to 62 degrees Celsius. What is the Cp
Wednesday, October 23, 2013 by Wyatt

Calculus
Romat 421 (a fictitious substance) decays by about 1.5% every day. How much of a 80 pound sample remains after 5days?
Wednesday, October 23, 2013 by Migena

ap chemistry
A sample of 1.67 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 25.594◦C to 26.041◦C. What is Hsolution for substance Z? Assume no heat is lost/gained by the cup itself...
Tuesday, October 22, 2013 by gabriella

science
A substance that has a mass of 20g and volume of 10cm3. How much mass does one cm3 of this substance have? A substance with a mass of 125g and a volume of 25cm3. How much mass does one cm3 of this substance have? Please tell me how to do this.
Tuesday, October 22, 2013 by Mi

cor biology
Substance X has a molar extinction coefficient (E) of 4725 l.mol-1. How many moles of X are needed to produce an absorbance of 1.0 in a 1 ml cuvette?
Wednesday, October 16, 2013 by Turki

Chemistry
Is boron trichloride a Giant covalent or Simple molecular substance?
Monday, October 14, 2013 by Hao

college essay
can someone help me edit this My Song My existence thus far has been a musical performance. The world is my stage, the platform upon which I express myself creatively. My life is the reputable melody that I play on my guitar, and the notes are my memories and life experiences...
Sunday, October 13, 2013 by chhristine

Chemistry
1)Which substance ( Ar or F2 ) has the higher boiling point? Select the two most important reasons below to justify your choice should have the higher boiling point *Both substances are nonpolar but the higher boiling includes hydrogen bonding *Both substances are nonpolar but...
Sunday, October 13, 2013 by walter white

Chemistry
Which substance ( HI or Xe ) has the higher boiling point? Its HI but chose one of the most appropriate reason. 1. Both substances are nonpolar but the higher boiling includes hydrogen bonding 2. Both substances are nonpolar but the higher boiling is more polarizable 3. The ...
Saturday, October 12, 2013 by ss01

Chemistry
Which substance ( HBr or HF ) has the higher boiling point? Its HF but chose one of the most appropriate reason. 1. Both substances are nonpolar but the higher boiling includes hydrogen bonding 2. Both substances are nonpolar but the higher boiling is more polarizable 3. The ...
Saturday, October 12, 2013 by ss01

CHEMISTRY
A solution contains 10.05 grams of an unknown covalent substance in 50.0 grams of water. The freezing point of this solution is (-) 3.16o C. What is the formula weight of the unknown compound?
Friday, October 11, 2013 by NEHE

chemistry
A solution contains 10.05 grams of an unknown covalent substance in 50.0 grams of water. The freezing point of this solution is (-) 3.16o C. What is the formula weight of the unknown compound? Below is what I tried, but don't know what to do next. Please explain step-by-...
Friday, October 11, 2013 by Anonymous

math
the half life of the carbon isotope C14 is about 5700 years. A. about how many years does it take 1000 grams of this substance to decay to 500 grams? B. about what percent of the original amount would you expect to find after 1000 years?
Wednesday, October 9, 2013 by becky

Found. Addict & Substance Abuse
What are the components of an effective aftercare plan for alcohol/drug abusers?
Thursday, October 3, 2013 by Chrissie

Basic Chemistry
2) Which of the following is a pure substance? (1point) Chocolate milk Orange juice Seawater*** Hydrogen peroxide (H2O2)
Thursday, October 3, 2013 by Gabby

Science
1) A(n)_________ is made up of two or more different atoms that are chemically combined.(1point) Compound Molecule*** Element Atom 2) Which of the following is a pure substance? (1point) Chocolate milk Orange juice Seawater Hydrogen peroxide (H2O2)*** 3) Which of the following...
Thursday, October 3, 2013 by Gabby

Chemistry
1. Which of the following is one way to prevent the corrosion of iron? A. Paint exposed iron parts with protective paint. B. Protect the iron from polluted air. C. Add carbon to the iron. D. Let the iron develop a natural coat of carbonate. 2. The source of the sun's heat ...
Thursday, October 3, 2013 by StarBuddy

phusics
At the end of most landing runways in airports, an extension of the runway is constructed using a special substance called formcrete. Formcrete can support the weight of cars, but crumbles under the weight of airplanes to slow them down if they run off the end of a runway. ...
Monday, September 30, 2013 by joe

Chemistry
Calculate the density of a substance in pennyweights that has a volume of 0.287hogsheads and a mass of 55.25kg. 1 pennyweight= 1.55g 1 hogshead=238.5 liters 1 peck=9.091 liters Answer in pw/pk.
Saturday, September 28, 2013 by Kacie

physics
the substance which allows heat radiations to pass through is.a)iron b)water vapour c)wood d)dry air
Saturday, September 28, 2013 by sweety.

science
An object with a mass of 70g and a volume of 100ml is most likely what substance
Thursday, September 26, 2013 by amanda

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 by bb

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 by John

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 by Princess

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 by Jenny

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 by Talan

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 by Talan

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 by Sarah

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 by Sarah

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 by Holley

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 by Miley

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 by Sam

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 by Tyler

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 by Emily

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 by Sozy

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 by loli

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 by Alice

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 by Alice

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 by Alice

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 by ODU

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 by Anonymous

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 by Amy

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 by nyikiwe

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 by Macy

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 by Jennifer Han

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 by Kris

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 by Sara

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 by Kristen

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 by Sara

life orientation
critically discuss 5 ways in which substance abuse can have an impact on human & environmental factor?
Monday, June 17, 2013 by noluthando zwane

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 by K

chemistry
for each pair of substance listed below identify one with lower boiling point
Friday, May 31, 2013 by himani.

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 by ady

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 by Steve

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 by Janaiby

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 by louisa

L.o
Human or environmental problem under substance abuse. The impacts
Sunday, May 26, 2013 by Amanda

life orientation
provide recommendations on how to address substance abuse
Tuesday, May 21, 2013 by june

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 by yani

life orientation
in 10-15 lines critically discuss 5 ways in which substance abuse impacts on the community.
Tuesday, May 14, 2013 by lerato

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 by Rabelani

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 by Kevin

science
A form of energy that is always transferred from a warmer substance to a cooler one.
Sunday, May 12, 2013 by john

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 by Tristan

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 by Annabelle Hartz

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 by Anonymous

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 by Joyce

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 by mmathapelo

substance
10-15 lines critically discuss 5 ways in which the human problem impacts on the community
Friday, May 3, 2013 by gloria

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 by Erica

Life orientation
Recommendations on how to address substance abuse
Thursday, May 2, 2013 by Promise

Life orientation
Five ways in wich substance abuse problem impact on the communities
Thursday, May 2, 2013 by Promise

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 by m

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 by Anonymous

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 by K

Physics
A bullet is made up of what substance?
Monday, April 29, 2013 by Ziphelele

Physics
A bullet is made up of what substance?
Monday, April 29, 2013 by Ziphelele

Physics
A bullet is made up of what substance?
Monday, April 29, 2013 by Ziphelele

Physics
A bullet is made up of what substance?
Monday, April 29, 2013 by Ziphelele

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 by Anonymous

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 by Rebecca

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 by Selby

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 by Anonymous

life orientation
Substance abuse of both legal and illegal drugs among the youth
Tuesday, April 23, 2013 by vukosi

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 by Millicent

sew
A chemical substance that causes dyes to set is called?
Sunday, April 21, 2013 by brianna

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 by sean

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 by ching chong

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 by Maupa Dimpho

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 by buyie

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 by Julia

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 by Grace

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