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April 18, 2014

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Recent Homework Questions About Substance Abuse

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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
1) LSD is a psychoactive substance (I'd call it a psychedelic drug; it had hideous consequences.) 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 7:06pm

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
the chemical substance called flavin (an anthocyanin) is it write?
Monday, May 28, 2012 at 9:15pm

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

substance drug addiction
Can someone help me with the consequences of this human factor
Sunday, May 27, 2012 at 1:31pm

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

chemistry
Here is a general scheme for any temperature range. heat WITHIN a phase is q = mass substance x specific heat in that phase (Tfinal-Tinitial) heat at a phase change. q = mass x heat fusion at freezing(melting point) q = mass x heat vaporization at boiling point. So you go ...
Thursday, May 24, 2012 at 11:54am

chemistry
recall that one mole of any substance is equal to Avogadro's number, which is 6.02 x 10^23 this number can be atoms, molecules, ions, etc. to get the number of moles, we just divide the given by the Avogadro's number: 2.8 x 10^20 / 6.02 x 10^23 = ?
Wednesday, May 23, 2012 at 11:01am

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
substance abuse
Monday, May 21, 2012 at 3:04pm

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

Drug addiction substance
It may lead to death at s0me stages
Thursday, May 10, 2012 at 2:49pm

substance drug addiction
Drug abuse is the c0nsumpti0n of a substance : wìtout medcl supervsn....
Thursday, May 10, 2012 at 2:06pm

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

Environmental Chemistry
This is a strong acid/base titration. Balance your equation for the reaction and calculate if you have excess H30+ or OH- Remember that pH=-log[H30+] and pOH = -log[OH-] pOH = 14 - pH Where [H30+] and [OH-] is the concentration of each substance in moles/liter
Tuesday, May 8, 2012 at 11:57am

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
http://www.medindia.net/patients/patient​info/DrugAbuse_Causes.htm http://www.emedicinehealth.com/substance​_abuse/page2_em.htm#Substance Abuse Causes http://www.medicinenet.com/drug_abuse/pa​ge3.htm#causes
Sunday, April 29, 2012 at 5:15pm

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

Life orientation
five ways in which the environmental substance abuse problem impacts on the community.
Saturday, April 28, 2012 at 4:00am

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

life orientation
critically discuss 5 ways in which substance abuse impacts on the community and provide relevant sources to support your claims
Thursday, April 26, 2012 at 12:10pm

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
http://www.google.com/#hl=en&sclient=psy​-ab&q=substance+abuse+causes&oq=substanc​e+abuse+ca&aq=1&aqi=g10&aql=1&gs_nf=1&gs​_l=serp.1.1.0l10.579449.593752.2.597151.​18.18.0.0.0.0.175.1606.16j2.18.0.cqn%2Cc​conf%3D0-95%2Cmin_length%3D2.1.mrefd8gcq&#...
Monday, April 23, 2012 at 7:19pm

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

Chemistry
Heat energy is the amount of heat used or available; heat capacity is the ability of a substance to absorb heat. Heat energy is measured in J or kJ and heat capacity is measured in J/g*K.
Saturday, April 21, 2012 at 4:18pm

Physical Science
A chemical change is a change in which something new is formed Physical change is a change in which the substance changes form but keeps its same chemical composition In ice, each of the molecules is connected to the molecules next to it, making it hard. Freezing is a change ...
Thursday, April 19, 2012 at 7:28pm

Biology
The main function of the stomach is digestion.other functions are 1)storing the food we eat. 2)breaking down of food into simpler substance into a liquidly mixture called chyme. 3)slowly empties that liquidly mixture into the small intestine ect...
Tuesday, April 17, 2012 at 1:40pm

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

Chemistry
When you are moving within a phase (for example, liquid water at one T to liquid water at another T OR ice at one T to ice at another T OR steam at one T to steam at another T), the equation to use is q = mass x specific heat of the substance in that phase x (Tfinal-Tintial). ...
Tuesday, April 10, 2012 at 3:45pm

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

Physics (12th Grade)
Internal energy may be expressed as U = ν•R•T/(γ-1), and U = ν• (i/2) •R•T, where ν is the amount of substance, i is the degrees of freedom (i1 =3, i2 =5), γ =Cp/Cv -adiabatic index. From p• V = ν•R•T, if V1...
Monday, April 9, 2012 at 10:25am

physics
Heat of fusion is the amount of heat energy required to change the state of a substance from solid to liquid. λ = 335000 J/kg is heat of fusion of water-ice c = 4185.5 J/(kg•K) is heat capacity of water Q1 = λ•m1 Q2 =c•m1 •(t-t1) =c•m1•t...
Monday, April 9, 2012 at 8:49am

Science
B (we determine the inner volume) C (we determine the total volume, i.e. the inner volume + the volume of shell substance)
Monday, April 9, 2012 at 6:15am

Life orientation
http://www.google.com/#hl=en&sclient=psy​-ab&q=substance+abuse+South+Africa&oq=su​bstance+abuse+South+Africa&aq=f&aqi=g-v4​&aql=1&gs_l=hp.3..0i15l4.5492l13982l0l14​200l28l27l0l0l0l0l303l3173l14j12j0j1l27l​0.cqn.1.&pbx=1&bav=on.2,or.r_gc.r_pw.r_q&#...
Sunday, April 8, 2012 at 1:55pm

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 2
The oxidizing agent is the substance that is reduced. I assume you made an typo in C and it should be Cr2O7^2-.
Friday, April 6, 2012 at 12:11am

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
c. 12OH^- + Cl2 ==> 2ClO3^- + 10e + 6H2O (Note: This is twice what you will need when you balance the entire equation so you just divide all of the coefficients by 2. That will leave just Cl (and not Cl2 but when you add it to the other half cell--likewise divided by 2--the...
Tuesday, April 3, 2012 at 2:54pm

Science
Thermal energy is generated and measured by heat of any kind. It is caused by the increased activity or velocity of molecules in a substance, which in turn causes temperature to rise accordingly.
Monday, April 2, 2012 at 6:05pm

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

TLC purity
@ Johnny: TLC stands for thin layer chromatography. TLC is used for monitoring the process of a reaction, identifying compounds, and determining the purity of a substance. When conducting an experiment on TLC, you can determine the purity of an unknown analgesic by examining ...
Sunday, March 25, 2012 at 11:39pm

TLC purity
@ Johnny: TLC stands for thin layer chromatography. TLC is used for monitoring the process of a reaction, identifying compounds, and determining the purity of a substance. When conducting an experiment on TLC, you can determine the purity of an unknown analgesic by examining ...
Sunday, March 25, 2012 at 11:38pm

English
Hello Zakkiya! I have made some corrections and alterations in your writing. There were a few points where I was unclear as to what you had intended to say, so I wrote comments in brackets. Some of your own words are in square brackets, and my comments are in regular brackets...
Friday, March 23, 2012 at 1:41am

Life orientation
Drugs generally work by interacting with receptors on the surface of cells or enzymes (which regulate the rate of chemical reactions) within cells. Receptor and enzyme molecules have a specific three-dimensional structure which allows only substances that fit precisely to ...
Tuesday, March 20, 2012 at 11:56pm

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

Chemistry
I have just what you need. There are four rules that will help although it won' cover everything. There are oxidation-reduction reactions that are not covered here although some are included here. Those are are another issue but will be covered when you cover redox ...
Friday, March 16, 2012 at 9:55pm

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
In reality you probably could, however it is not good science as it has been considered to be contamined or already used and a new substance or solution should be obtained. I know this is wasteful but, that is just how it is.
Sunday, March 11, 2012 at 2:25pm

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

chemistri
Copy & Paste I copied and pasted this off of another site. "It is important to remember that van der Waals' forces are forces that exist between MOLECULES of the same substance. They are quite different from the forces that make up the molecule. For example, a water ...
Saturday, March 10, 2012 at 4:32pm

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? Answer Release of interleukin-10 Recruitment of B cells Release of histamine The presence of flatworms...
Sunday, March 4, 2012 at 11:35pm

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

chemistry
I think a straight Ne light is red unless the inside of the tube has been coated with a substance that changes the color.
Wednesday, February 29, 2012 at 8:48pm

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
Technically it really makes no difference which we call the solute and which the solvent. By convention, we usually say the solid is the solute and the liquid is the solvent. In liquid/liquid solutions, we usually call the smaller amount of substance the solute and the higher ...
Tuesday, February 21, 2012 at 9:19pm

physics/chemistry
Electrical conductivity is a physical property. A chemical property involves a change that occurs. However, when electricity passes through an object or substance, no change occurs.
Tuesday, February 21, 2012 at 11:49am

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

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