Tuesday
December 6, 2016

Homework Help: Health: Substance Abuse

Recent Homework Questions About Substance Abuse

math
When a chemist dilutes pure acid with another substance, the resulting mixture is no longer pure acid. Consistent with the words, pure acid is 100% acid. So, there are 20 grams of pure acid in 20 grams of a pure-acid solution. Laura, a chemist, has 20 grams of a solution that ...
Sunday, December 4, 2016 by Julia

math
The radioactive decay of a substance is expressed by A=A^0 e^ -kt, where the initial amount A^0, decays to an amount A after t years. The positive constant k differs for each substance. Strontium 90 decays such that k=.028. Find out how much of 1,000 mg of strontium 90 remains...
Thursday, December 1, 2016 by sara

Physics
A cylindrically shaped piece of collagen (a substance found in the body in connective tissue) is being stretched by a force that increases from 0 to 0.0436 N. The length and radius of the collagen are, respectively, 2.90 cm and 0.0815 cm, and Young's modulus is 3.1 x 106 N...
Monday, November 28, 2016 by BrookeNeed

Science
What is a substance that absorbs and reflects diffrent wavelenghts of light?
Monday, November 28, 2016 by Emma R.

Science
What is a substance that absorbs and reflects diffrent wavelenghts of light?
Monday, November 28, 2016 by Gracie K.

Math
A radioactive substance decays to the formula N=8e^-0.6t , where N is the number of milligrams present after t hours. Determine the initial amount of the substance to the nearest 10th of an hour, determine the half life of the substance, and determine the number of hours for 0...
Sunday, November 27, 2016 by pypski

Physics
A substance has the following properties; Boiling Point = 140 °C, Freezing Point = -10 °C, specific heat as a gas, liquid and solid, 0.3 cal/g.C°, 1.8 cal/g.C° and 0.8 cal/g.C° respectively. Heat of fusion =100 cal/g and heat of vaporization = 480 cal/g. ...
Sunday, November 27, 2016 by Clarity

pre calc
You have a sample of a certain radioactive substance. After two days, thirty percent of the sample has decayed. What is the half-life of the material and how much will have decayed after a week?
Tuesday, November 22, 2016 by math

Philosophy
Section I: Answer the questions below about this brief passage: During the nineteenth century, many women died from what was then called “childbed fever”. A Viennese physician, Ignaz Semmelweis, concluded (diagnosed) that the cause of this disease was a “germ&#...
Thursday, November 17, 2016 by Jessica

Chemistry
Sample A: Solid appearance:crystals, solids, white Solid Conductivity:no Solubility: soluble Solution appearance:substance disappears slowly Solution Conductivity: yes Relative melting point:2nd Sample B: Solid appearance:brown, tiny solids, dirt appearance Solid Conductivity...
Wednesday, November 16, 2016 by Sarah

Chemistry
Calculate the standard enthalpy change for the reaction 2A+B?2C+2D Use the following data: Substance ?H?f (kJ/mol) A -247 B -375 C 191 D -483 Express your answer to three significant figures and include the appropriate units. My answer was 285 kJ/mol but mastering Chemistry ...
Wednesday, November 16, 2016 by Marquel

health
During the exchange of air in your lungs, oxygen is being taken into your bloodstream while this substance is being released. microorganisms carbon dioxide plasma mucus
Wednesday, November 16, 2016 by Gaganjyot Bhatti

College Calculus
A radioactive substance has a half-life of 27 years. Find an expression for the amount of the substance at time t if 20 grams were present initially.
Monday, November 14, 2016 by Jaken

science
Sodium react with chlorine to form sodium chloride a substance used in all households 1.Household name of sodium chloride
Sunday, November 13, 2016 by sbonga

College algebra
Sample of 500gms radioactive substance decays according to the function A(t)-500-0.044t where t is the time in years. How much of the substance will be left in the sample after 20 years?round to the nearest whole gram
Saturday, November 12, 2016 by Deborah

pre calc
You have a sample of a certain radioactive substance. After two days, thirty percent of the sample has decayed. What is the half-life of the material and how much will have decayed after a week?
Tuesday, November 8, 2016 by mathhh

pre-calc.
Problem 1. You ingest a certain dangerous bacteria at dinner by accident. When more than 1,000,000 of these organisms are in your gut, you will become violently ill. Their population doubles every 20 minutes. You ate dinner at 7pm and by 5am you are sick. At least how many of ...
Tuesday, November 8, 2016 by cool

Chemistry
Elements A and B combine to form two different compounds. The first compound contains 15.0 grams of substance A, and 8.60 grams of substance B. It can be represented by the formula A2B (subscript 2). The second compound contains 5.0 grams of substance A, and 4.30 grams of ...
Wednesday, November 2, 2016 by N

Chemistry
A 2.35 g sample of a substance suspected of being pure gold is warmed to 72.2 ∘C and submerged into 15.5 g of water initially at 24.1 ∘C. The final temperature of the mixture is 26.5 ∘C. Part A What is the heat capacity of the unknown substance? Part B Could ...
Sunday, October 30, 2016 by Jo n

Chemistry
A gallon of isopropanol (IPA) weighs 6,55 lbs. Since 1 lb=453.6 grams, calculate how many moles of ethanol (MM=60.1 grams per mole) are in a gallon of this substance.
Wednesday, October 26, 2016 by Anonymous

science
the volume of 50gram of a substance is 20centimetercube if the density of water is 1gram/centicentimetercube will the object float or sink
Wednesday, October 26, 2016 by rahul sharma

Physical Science
1. which of the following should be classified as a suspension? A. soda** B. sand in water C. glass D. milk 2. Which of the following is an of example of a chemical property? A. density B. flammability C. hardness** D. melting point 3. Which state of matter has a definite ...
Thursday, October 20, 2016 by Becky

Physics
An unknown substance at a temperature of 20 degrees Celsius is warmed up to 50 degrees when water at 80 degrees is added to it. Can I post this question. There is more information I have and the point is to find the specific heat of the unknown substance.
Tuesday, October 11, 2016 by Victor

Science
chemical property mixture heatcapasity homogeneous viscosity sublimitation physicalproperty compound chemicalformula substance density mass tempurature pressure heterogenerous A _________ property of matter describes its ability to change into different substances.unsure The ...
Wednesday, October 5, 2016 by Katie

differential equation
suppose you start with 75 grams of the substance after 2.5 min you have grams left. how much longer will it take you have half remaining
Sunday, October 2, 2016 by meynard

Physics
A carnot refrigerator uses an ideal carnot cycle to cool its interior. The outside air has a temp of 304K and the refrigerator is kept at a temp of 279K. 1) what is the coefficient of performance of this refrigerator? 2) if the refrigerator does 1500J of work on the working ...
Thursday, September 29, 2016 by physics struggles

Physics
A carnot refrigerator uses an ideal carnot cycle to cool its interior. The outside air has a temp of 304K and the refrigerator is kept at a temp of 279K. 1) what is the coefficient of performance of this refrigerator? 2) if the refrigerator does 1500J of work on the working ...
Thursday, September 29, 2016 by physics struggles

Science
What would the density of 8 g of the unknown substance from Zarkon be
Wednesday, September 28, 2016 by Jennifer

Science
A substance has melting point of 0 Celius and a boiling point of 100 Celius. The substance is most likely * water * hydrogen * gold * table salt
Monday, September 26, 2016 by Plurp

Math
Suppose f(t) = P0e^-0.3t grams of radioactive substance are present after t seconds. If 200 grams of substance are present initially, how much is present after 4 seconds? What is the half-life of the substance?
Friday, September 23, 2016 by Freud Mark

chemistry
is this statement true? More heat is needed for vaporization of a liquid compared with melting a solid of the same substance.
Friday, September 23, 2016 by laura

AP Chemistry
(DrBob222 please help me) A sample of 1.97 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 25.015◦C to 25.484◦C. What is ∆Hsolution for substance Z? Assume no heat is ...
Thursday, September 22, 2016 by Rachel

Chemistry
The density of an unknown gas is 1.23 g/L in 330K and temperature 25.5 pressure kPa. What is the molar mass of the substance?
Friday, September 9, 2016 by MONICA

chemistry
a) What is fellesioneffekten?   Veronal is a barbiturate (structure see above). Barbiturates is a substance class which occur in a variety of drug classes, including sleep medications (hypnotikasedativa), in painkillers (anesthetics) and anticonvulsants. A barbiturate is ...
Friday, September 9, 2016 by Maria

chemistry
a) What is fellesioneffekten?   Veronal is a barbiturate (structure see above). Barbiturates is a substance class which occur in a variety of drug classes, including sleep medications (hypnotikasedativa), in painkillers (anesthetics) and anticonvulsants. A barbiturate is ...
Friday, September 9, 2016 by Maria

Chemistry
What substance is acting as the Brønsted-Lowry base in the forward reaction below? H2O + NH3 yields NH4+ + OH-
Saturday, September 3, 2016 by MONICA

Science
Which of the following is not a postulate of the kinetic molecular theory? A. The collisions between gas molecules are elastic. B. The energy of a gas molecule is determined by quantum mechanics. C. Gas molecules travel in random, straight paths. D. The absolute temperature of...
Thursday, August 18, 2016 by Science

Chemistry
Calculate how many grams of the substance and how many grams of water is in a solution of 400g with a concentration of a 30%
Monday, August 15, 2016 by David

Chem
Doing which of the following generally increases the entropy of a substance? A. freezing it B. dissolving it in water C. condensing it D. all of the above My answer: D, all of the above.
Monday, August 15, 2016 by Cherry

physics
A substance has a melting point of 800ºC and a boiling point of 1465ºC. The substance is most likely A. water. B. hydrogen. C. gold. D. table salt. D?
Tuesday, August 9, 2016 by quick help needed

physics
The stiffness of an elastic substance is 700N/m calculate the extension of the substance when the load of 25 kg hang on it (g is 9.8m/s squred)
Monday, August 8, 2016 by oluwabunmi

Math
Suppose that the half-life of a substance is 250 yrs. .If there were initially 100 g of substance .How much will remain after 500 years??with solution please
Monday, August 8, 2016 by Queen

Chemistry
What is Anta basic substance?
Sunday, July 31, 2016 by Utsav

Chemistry
How do you determine the polarity of a substance? Example?
Friday, July 29, 2016 by George

life orientation
examine how each of following are responsible for road accident and propose the potential solution by community 1.1 competence of the driver 1.2 substance abuse 1.3 pedestrian 1.4 cyclists 1.5 live stock
Thursday, July 28, 2016 by phumudzo

Chemistry
For two questions below, first write and balance the equation for the chemical reaction.  Please, also review the material in Chapter 8, if you will feel you might need it in order to answer the questions.  Next, please answer the following questions: (a) ...
Wednesday, July 20, 2016 by Chem&Society

phy
The thermal capacity of 10g of a substance is 8 calories. the specific heat is in J/kg-K
Monday, July 18, 2016 by yogeg

chemistry
Solubility (g/100gH2O) Substance 20∘C 50∘C KCl 34.0 42.6 NaNO3 88.0 114.0 C12H22O11 (sugar) 203.9 260.4 Using the above table, determine whether each of the following solutions will be saturated or unsaturated at 50 ∘C. 1.) Adding 19.7 g KCl to 35.0 g H2O 2.)...
Sunday, July 17, 2016 by maria

Chemistry
For the following reaction, identify the substance being oxidized and reduced CH4 + 2 O2 = CO2 + 2 H2O
Wednesday, July 6, 2016 by Dylan

Chemistry
What is the oxidized substance in the following reaction? Fe + 2HCl → FeCl2 + H2
Wednesday, July 6, 2016 by Dylan

Physics
An unknown mass of a certain solid, initially at 60⁰C, is heated at a uniform at a uniform rate. After 4.0 min the solid reaches its melting point of 80⁰C, and it remains at that temperature for 3.0 min until completely melted. After a further 6.0 min of heating, ...
Monday, July 4, 2016 by John Carlo

Chemistry
I had to do a lab and had to calculate the molar mass for a substance with this equation MM=Mrt/pv but we had to calculate the mass of the substance and its temperature experimently. My question is why did we have to boil the liquide in a water containing becker. Why did we ...
Monday, June 27, 2016 by Gabby

CALCULUS
Let y(t) denote the mass of a radioactive substance at time t.t. Suppose this substance obeys the equation y′(t)=−14y(t). Assume that, initially, the mass of the substance is y(0)=M>0. At what time does half of the mass remain? (Round your answer to 3 decimal ...
Monday, June 20, 2016 by Sarah

english
give the substance of the poem daybreak.
Saturday, June 18, 2016 by sarbottam sau

physics
one cubic meter of water hass a mass of 1.0x10^-3. (a) determine the mass of 1.0 m^3. (b) assu!ing biological substance are 98% water, estimate the mass of cell with a 1.0 micrometer dia!eter, a human kidney and a fly. assume a kidney is roughly a sphere with radius of 4.0 cm...
Saturday, June 18, 2016 by Michael

physics
The horizontal door of a substance at a depth of 500m has an area of 0.4m^2 . Calculate the force exerted by the sea water on the door at this depth.
Tuesday, June 14, 2016 by somay

chemistry
Suppose a substance has been prepared that is composed of carbon, hydrogen, and nitrogen. When 0.1156 gram of this compound is reacted with oxygen, 0.1638 gram of carbon dioxide (CO2) and 0.1676 gram of water (H2O) are collected. Assuming that all the carbon in the compound ...
Friday, June 3, 2016 by Chansa

Physical Science
Diamond is a covalently bonded substance made of pure carbon. Each carbon atom has six total electrons so this means carbon shares ________ electron(s) with other carbon atoms. A) one B) two C) four D) six Help Please!
Wednesday, June 1, 2016 by Ben Dover

SCIENCE HELP
CAN SOMEONE CHECK THESE!! 1. Which of the following is a reason why a person might want to wear snowshoes if walking a distance in deep snow? (1 point) snowshoes spread the person’s weight out snowshoes reduce the amount of pressure on a given spot snowshoes keep the ...
Saturday, May 28, 2016 by gabby

physical science
Name the intermolecular forces in each of the above mentioned substance and water
Saturday, May 28, 2016 by lesego mosweu

ordinary differential equation
A contains 200 liters of solution in which is dissolved 40 kg of salt. Tank B contains 400 liters of solution in which are dissolved 80 kg of salt. Pure water flows into tank A at rate of 10 liters per second. There is a drain at the bottom of tank A. Solution leaves tank A ...
Saturday, May 21, 2016 by thigan

chemistry
calculate the masses of each substance formed when 10g of CaCO3 reacts with excess HCl so far I've found the ratio between the substances but from then on, I'm lost
Wednesday, May 18, 2016 by struggle

Chemistry
What does the symbol ∆H stand for? one Calorie given off by a reaction the heat capacity of a substance*** the heat of a reaction for a chemical reaction the specific heat of a substance
Monday, May 16, 2016 by Ben

Math
If a substance has a half life of 600 seconds. If a scientist begins with an initial amount of 1kg complete the following problems: create an exponential equation using proper variables?
Wednesday, May 11, 2016 by Cali

Algebra
A radioactive kind of nitrogen has a half life of 10 minutes. If you start with 64 grams of the substance, how much will be left after 20 minutes?
Friday, May 6, 2016 by Ana Y

Science test review
Here are all the word you can use I need help chemical property mixture heat capasity homogeneous viscosity sublimitation physical property compound chemical formula substance density mass tempurature pressure heterogenerous 14. A property of matter describes its ability to ...
Monday, May 2, 2016 by jj

Exponential Modeling
The half-life of a radioactive substance is one day, meaning that every day half of the substance has decayed. Suppose you have 100 grams of this substance. How many grams of the substance would be left after a week?
Sunday, May 1, 2016 by Anonymous

Physics
What is the maximum mass of a rubber block that can be pulled by a rope whose maximum tension is 3500N? The block is sitting on dry asphalt. (By the way, 1.2 would be used as the coefficient of static friction and 0.8 is the coefficient of kinetic friction for rubber substance...
Wednesday, April 27, 2016 by Kid

Calculus
The rate of decay is proportional to the mass for radioactive material. For a certain radioactive isotope, this rate of decay is given by the differential equation dm/dt = -.022m, where m is the mass of the isotope in mg and t is the time in years. A. If m(0)=20, write a ...
Saturday, April 23, 2016 by Anonymous

life orientation
Examine how each of the following are responsible for road accident and propose practical solutions by community: substance abuse, pedestrian,cyclists and livestock
Thursday, April 21, 2016 by afata

life orientation
Examine how livestock and substance abuse are responsible for road accident and propose practical solutions by community
Thursday, April 21, 2016 by afata

Advanced Chemistry
he vapor pressures of several solutions of water-propanol(Ch3Ch2Ch2OH) were determined at various compositions, with thefollowing data collected at 45C: XH2O Vapor pressure (torr) 0 74.0 .15 77.3 .37 80.2 .54 81.6 .69 80.6 .83 78.2 1.00 71.9 a.) Are solutions of water and ...
Wednesday, April 20, 2016 by Anonymous

science
the solubility of an unknown substance is 120 grams of water at 70 degrees celsius. What is it?
Wednesday, April 20, 2016 by Justin

Chemistry
The molar solubility of a generic substance, Mg(OH)2 ksp = (1.2x10^-11) in 0.10 M NH3 Kb = 1.8 x 10^-5 help me please =)
Monday, April 18, 2016 by Damon

Chemistry
What is the molecular mass of a substance X if 1.00 L of a solution containing 4, 5 g of X has an osmolality of 0.337 mmHg the 30° C?
Thursday, April 14, 2016 by Caline

science
Which of the following is true? Choose all that apply. a. When molecular kinetic energy transferred to a substance, the motion of the molecules in the substance increases. b. When molecular kinetic energy is transferred away from a substance, the temperature of the substance ...
Tuesday, April 12, 2016 by jai

science
Which of the following is true? Choose all that apply. a. When molecular kinetic energy transferred to a substance, the motion of the molecules in the substance increases. b. When molecular kinetic energy is transferred away from a substance, the temperature of the substance ...
Tuesday, April 12, 2016 by jai

science
Here are all the word you can use chemical property mixture heatcapasity homogeneous viscosity sublimitation physicalproperty compound chemicalformula substance density mass tempurature pressure heterogenerous A _________ property of matter describes its ability to change into...
Monday, April 11, 2016 by jacob

math
In a science experiment, the temperature of a substance is changed from 42 degrees Fahrenheit to -54 degrees Fahrenheit at an average rate of -12 degrees per hour. Over how many hours does the change take place?
Wednesday, April 6, 2016 by Anonymous

chemistry
When water freezes and becomes solid ice, the hydrogen bonds create a crystal structure and there is fixed space between each water molecule. This causes ice to? a.become more dense than liquid water because it is a solid* b.become less dense than liquid water and therefore ...
Tuesday, April 5, 2016 by Boberto

specialized patient record
You are the director of health information services in a major medical center that maintains both a psychiatric unit and a substance abuse unit in addition to general medical and surgical units. Your facility plans to join a computer network with fifteen hospitals throughout ...
Monday, March 28, 2016 by Anonymous

Science
13.)How can substance A and B be compared? Choose all that apply. A.)The particles of substance A have more energy than the particles of substance B.*** B.)The particles of substance A are more tightly held together than the particles of substance B. C.)The particles of ...
Wednesday, March 16, 2016 by #FreeGucci

science
1. What would happen to an object if the force of gravity on Earth was decreased by half? (1 point) Its mass would decrease. Its weight would decrease.* Its density would decrease. Its volume would decrease. 2. Which of the following represents a heterogeneous mixture? (1 ...
Wednesday, March 16, 2016 by jai

chemestry
In which of the following physical states does a given substance have the highest entropy? A. solid B. gas C. liquid D. all of the above would this be A?
Tuesday, March 15, 2016 by louren

Chemistry-DrBob222
I know I pored this already, but I for it to mention the assumption. See below. A calorimeter contains 30.0 mL of water at 15.0 C. When 1.50 g of X (a substance with a molar mas of 46.0g/ mol is added, it dissolves via the reaction X (s) + H2O (l) ----> X (aq) and the ...
Friday, March 11, 2016 by Student

Chemistry
A calorimeter contains 30.0 mL of water at 15.0 C. When 1.50 g of X (a substance with a molar mas of 46.0g/ mol is added, it dissolves via the reaction X (s) + H2O (l) ----> X (aq) and the temperature of the solution increases to 26.5 C. Calculate the enthalpy change for ...
Friday, March 11, 2016 by Student

math
The equation for the pH of a substance is pH = –log[H+], where H+ is the concentration of hydrogen ions. A basic solution has a pH of 11.2. An acidic solution has a pH of 2.4. What is the approximate difference in the concentration of hydrogen ions between the two ...
Wednesday, March 9, 2016 by Anonymous

Chemistry
Calculate the molarity of a solution which contains 0.40 mol of a substance dissolved in 1.6 L of a solution.
Tuesday, March 8, 2016 by Jasmine

science
1. The current atomic model would be revised if (1 point) better microscopes were being used to study its structure. better microscopes are invented in the future. new information about an atom’s structure is discovered. a new element is discovered in the future. 2. ...
Thursday, March 3, 2016 by Anonymous

Physics
3/2/2016 An unknown substance at a temperature of 20 degrees Celsius is warmed up to 50 degrees when water at 80 degrees is added to it. The sum of the masses of the unknown substance and water is equal to 1000grams. In another experiment, the same substance at 20 degrees is ...
Wednesday, March 2, 2016 by Marilynn on behalf of Victor Hopman

Chemistry
what is the concentration of each substance if a solution is prepared by mixing 5.00g of NaC2H3O2 with 15.0 ml of 1.45M acetic acid and then bringing the total volume to 250.0 ml?
Monday, February 29, 2016 by Ali

Science
4.)When two or more atoms of the same of the same element are in a chemical bond, the substance is called a(n)________ A.)Compound B.)Molecule C.)Nucleus D.)Particle*** Am I'm correct? BUT My mom disagree's and says C?, isn't she wrong?
Wednesday, February 24, 2016 by #FreeGucci

Chemistry
Pyridine, a substance used as a catalyst in some synthetic reactions is a very weak base its degree of ionization is equal to 0.03% in solution 0.02 mol L -¹. Determine the ionization constant.
Tuesday, February 23, 2016 by Michael

Chemistry1
The questions asks to write a word equation and a balanced chemical equation for a reaction between aqueous copper (ii) sulfate and solid iron. Assume that iron forms the Fe2+ ion.) Include proper states of matter after each substance (s, l, g, aq). Here is what I got ANSWER: ...
Monday, February 22, 2016 by Dina

Health (can someone plz check my answers??)
1. The functions of the respiratory system are... (there are two answers) A. To pump blood to the body B. To deliver oxygen to the body*** C. To remove carbon dioxide from the body*** D. To absorb nutrients 2. The dome-shaped muscle that lies below the lungs and is important ...
Monday, February 22, 2016 by Anonymous

Health
1. The exchange of carbon dioxide and oxygen takes place in the A. alveoli** B. asthma C. bronchi D. diaphragm 2. ________ is a substance in tobacco smoke that reduces the blood ability to carry oxygen A. Tar B. Nicotine C. Asthma D. Carbon monoxide** Check
Friday, February 19, 2016 by Carmen

Health
1. The functions of the respiratory system are (choose 2) A. to pump blood to the body** B. to deliver oxygen to the body** C. to remove carbon dioxide from the body D. to absorb nutrients 2. ______ is a substance in tobacco products that causes stained teeth and skin A. ...
Friday, February 19, 2016 by Hanna

Health and Physical Ed
If you choose to smoke, your body will use this substance less efficiently. 1:microorganisms 2:carbon dioxide 3:plasma 3:oxygen I think it is #3
Friday, February 19, 2016 by Gabby

science
a 54-gram sample of an unknown material has a volume equal to 20cm3 what is the identity of the substance
Thursday, February 18, 2016 by kyle

Math
An unknown radioactive substance has a half-life of 124 years. How long will it take a 67 grams sample to degrade to 18 grams?
Wednesday, February 17, 2016 by Maria

  1. Pages:
  2. 1
  3. 2
  4. 3
  5. 4
  6. 5
  7. 6
  8. 7
  9. 8
  10. 9
  11. 10
  12. 11
  13. 12
  14. 13
  15. 14
  16. 15
  17. Next>>

Homework Help: Health