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August 29, 2014

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Recent Homework Questions About Substance Abuse

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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

Chemistry
Pure water boils at 100ºC (212ºF). When a substance is added to the water the boiling point increases due to what is referred to as the boiling point elevation. (a) What is the molecular mass of sucrose (C₁₂H₂₂O₁&​#8321;)? (b) If ...
Sunday, March 18, 2012 at 9:47am

Science-Chemistry
In the following test for Sulfated Ash, ammonium carbonate solution was added. What is the purpose of adding ammonium carbonate solution? Heat a silica crucible to redness for 30 minutes, allow to cool in a desiccator and weigh. Place 1g of the substance in the crucible and ...
Sunday, March 18, 2012 at 5:51am

MATH!
The mass of a radioactive substance follows an exponential decay model, with a decay rate of 5% per day. A sample of this radioactive substance was taken six days ago. If the sample has a mass of 3 kg today, find the initial mass of the sample. Round your answer to two decimal...
Thursday, March 15, 2012 at 8:53pm

Living environment
acidic substance secreted by glands in the stomach wall is it pepsin enzyme that breaks down starch into maltose is it salivary amylase organ in which bile is stored is it gallbladder
Tuesday, March 13, 2012 at 7:39pm

Physics
A 500.0 g metal block absorbs 3.25 × 103 J of heat to raise its temperature by 50.0 K. What is the substance? Please show steps because I have several problems like this and then I can see where I am goibg wrong
Monday, March 12, 2012 at 2:37pm

Chemistry
After a Melting point determination, why can't you re-use the solidified substance and capllary tube for subsequent determination?
Sunday, March 11, 2012 at 2:15pm

Functions/Logarithims
Energy is needed to transport a substance from outside a living cell to inside the cell. This energy is measured in kilo calories per gram molecule, and is given by E = 1.4 log (C1) / (C2 where C1 represents the concentration of the substance outside the cell, and C2 ...
Thursday, March 8, 2012 at 8:35pm

Science
Radioactive substance decays so that after t years, the amount remaining, expressed as a percent of the original amount, is A(t)=100(1.6)^(-t). a) Determine the function A’, which represent the rate of decay of the substance. b) what is the half-life for this substance? c...
Tuesday, March 6, 2012 at 11:03pm

Calculus-derivatives
Verify if these are correct answers. 1. The derivative of f(x)=e^2x -e^-2x is f'(x)=2e^2x - 2e^-2x? 2.A certain radioactive substance is decaying so that at time t, measured in years, the amount of the substance, in grams, given by the function f(x)=3e^-3t. What is the ...
Tuesday, March 6, 2012 at 7:09pm

biology
Question 18 If a child was allergic to a substance scratched onto their skin, the area turned red and swollen within about 10 minutes. Which of the following would cause these symptoms? Answer Release of interleukin-10 Recruitment of B cells Release of histamine The presence ...
Sunday, March 4, 2012 at 11:36pm

biology
If a child was allergic to a substance scratched onto their skin, the area turned red and swollen within about 10 minutes. Which of the following would cause these symptoms?
Sunday, March 4, 2012 at 10:52pm

Physics
An unknown substance is found to require a very large amount of heat energy to raise its temperature a single degree. Does it have a high specific heat capacity or a samall specific capacity? Explain
Saturday, March 3, 2012 at 3:48pm

Chem
What stoichiometric concentration of the indicated substance is required to obtain an aqueous solution with the pH value shown below? a)aniline, C6H5NH2, for pH= 9.05 b)NH4Cl for pH= 5.22
Friday, March 2, 2012 at 8:41pm

Chemistry
What stoichiometric concentration of the indicated substance is required to obtain an aqueous solution with the pH value shown below? aniline (C6H5NH2) for PH of 9.05 I converted pH to pOH so pOH=4.98 [OH-] =1.122*20^-5 C6H5NH2 + H2O --------> C6H5NH3+ + OH- I: a N/A 0 0 C...
Friday, March 2, 2012 at 8:13pm

chemistry
A certain substance has a molar heat of vaporization of 54.2 kJ/mol. How much of the substance is in a sample that requires 80.0 kJ to vaporize? Answer in units of mol
Thursday, March 1, 2012 at 6:32pm

chemistry
Find the molar heat of vaporization for a substance, if 3.28mol of the substance absorbs 24.8 kJ of energy when it changes from a liquid to a gas. Answer in units of kJ/mol
Thursday, March 1, 2012 at 5:38pm

Physics
Calculate the net charge on a substance con- sisting of a combination of 7.2 × 1013 protons and 4.8 × 1013 electrons. Answer in units of C
Tuesday, February 28, 2012 at 1:14am

Chemistry
If you can show me an example of one problem, I have no idea how to approach this. Calculate where the number 40.67 came from. Use the Clapeyron-Clausisus equation. Assuming that delta H vap does not change with temperature, this equation relates the change in vapor pressure ...
Sunday, February 26, 2012 at 6:47pm

physics
Calculate the net charge on a substance consisting of a combination of 8.9 × 10 13 protons and 4.4 × 10 13 electrons. Answer in units of C
Sunday, February 26, 2012 at 2:04pm

physics
What are the factors that affect the quantity of heat needed to raise the temperature of a substance?
Friday, February 24, 2012 at 3:30am

life orientation
substance abuse of both legal and illegal drugs among the youth
Thursday, February 23, 2012 at 9:48am

chemistry
The initial concentration of the a substance was 1.95 M. After 27.72 hours the concentration was 0.9750 M. After anothers 55.44 hours the concentration was 0.4875 M (total time = 83.16 hours). If another experiment were conducted in which the initial concentration was 0.427 M...
Saturday, February 18, 2012 at 11:47pm

Chemistry
How do you calculate the mass in kilograms of 3.99 liters of acetic acid. The density of this substance is 1.05 g/mL.
Saturday, February 18, 2012 at 10:50pm

Help me please I dont know this quation
How to affect lattice energy,charge on the ion and radius of the ion, the solublity of the substance. please if it is possible with example
Friday, February 17, 2012 at 7:45am

chemistry
Can you determine the molecular formula of a substance from its percent composition?
Wednesday, February 15, 2012 at 1:51pm

college physics
calculate the specific heat of 200g of substance whose temperature is 30 degree celcius if it is mixed with 200g of water heated in a 300g iron container at 100 degree celcius. the final temperature of the mixture is 98 degree celcius.
Tuesday, February 14, 2012 at 9:06pm

college physics
calculate the specific heat of 200g of substance whose temperature is 30 degree celcius if it is mixed with 200g of water heated in a 300g iron container at 100 degree celcius. the final temperature of the mixture is 98 degree celcius.
Tuesday, February 14, 2012 at 9:06pm

5th grade science
A substance seems to completely fill a container, but more can be forced in. The substance is a
Tuesday, February 14, 2012 at 8:01pm

chemistry
Reactions in which a substance decomposes by losing CO are called decarbonylation reactions. The decarbonylation of acetic acid proceeds as follows: CH3COOH(l)= CH3OH(g)+ CO(g. By using data from Appendix C in the textbook, calculate the minimum temperature at which this ...
Tuesday, February 14, 2012 at 7:31pm

Chemistry(Please help, thank you)
For the equation: deltaHrxn = qrxn / mol substance to calculate deltaH per mole what does the mol substance mean? Does this mean that you use the mm of the substance or if you already calculated the # of moles of a substance do you use that?
Monday, February 13, 2012 at 9:31pm

Chemistry
For the equation: deltaHrxn = qrxn / mol substance to calculate deltaH per mole what does the mol substance mean? Does this mean that you use the mm of the substance or if you already calculated the # of moles of a substance do you use that?
Monday, February 13, 2012 at 8:00pm

Chemistry
I had to perform an experiment using a coffee-cup calorimeter to determine the enthalpies of two seperate reactions. For part 1 we worked with magnesium metal, and magnesium oxide. Data was collected and now I need to find the q, heat transferred for both magnesium and ...
Monday, February 13, 2012 at 7:18pm

Chemistry
1) The molecular mass of a substance was determined by the freezing point depression technique. The minimum data required for the determination are a. ƒ´Tf and Kf only. b. ƒ´Tf , Kf and mass of solute. c. ƒ´Tf , Kf , mass of solute and mass of ...
Monday, February 13, 2012 at 1:59pm

Chemistry(Please check)
1) The molecular mass of a substance was determined by the freezing point depression technique. The minimum data required for the determination are: a) delta T and Kf only b) delta T, Kf, and mass of solute c) delta T, Kf, mass of solute, and mass of solvent d) delta T, Kf, ...
Saturday, February 11, 2012 at 9:50am

Chemistry(Please check)
1) The molecular mass of a substance was determined by the freezing point depression technique. The minimum data required for the determination are: a) delta T and Kf only b) delta T, Kf, and mass of solute c) delta T, Kf, mass of solute, and mass of solvent d) delta T, Kf, ...
Friday, February 10, 2012 at 11:54pm

chm
An unknown radioactive substance has a half-life of 3.20 . If 34.8 of the substance is currently present, what mass was present 8.00 hours ago?
Friday, February 10, 2012 at 12:23am

Chemistry
The vapor pressure of an unknown substance is given at various temperatures. properties of the substance are: density of solid=1.375g/ml density of liquid= 1.150g/ml. freezing point= 275.0K boiling point=375.0 K How would i calculate the vapor pressure at 150.0K
Tuesday, February 7, 2012 at 8:51pm

Chemistry
The vapor pressure of an unknown substance is given at various temperatures. properties of the substance are: density of solid=1.375g/ml density of liquid= 1.150g/ml. freezing point= 275.0K boiling point=375.0 K How would i calculate the vapor pressure at 150.0K measured at ...
Tuesday, February 7, 2012 at 8:00pm

science
How is temperature related to the average kinetic energy of molecules that make up a substance?
Tuesday, February 7, 2012 at 3:22am

physics
The specific temperature at which a substance changes from a liquid to a gas is an example of a?
Monday, February 6, 2012 at 7:53am

science
Can you help me with these question(s) please??? What substance does a cell use to power active transport? Describe the movement of material during diffusion. Describe the movement of material during active transport. I would appreciate any help whatsoever. Thank you. kathy
Sunday, February 5, 2012 at 12:14pm

chemistry
A 40-year old man, at a prominent legal firm experiences abdominal pain post lunch. He takes several trips to the restroom, but continues to experience pain and cramps. He decides to go to the doctor and admits he consumed 2 bottles of beer @ lunch. The alcohol content (...
Sunday, February 5, 2012 at 8:26am

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