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March 25, 2017

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Homework Help: Health: Substance Abuse

Recent Homework Questions About Substance Abuse

science
The small structures in the cell that carry out the cell's activities are known as?   The ____ can be described as the basic unit of life The jelly-like substance that fills the cell is called Mitochondria are responsible for
Friday, March 24, 2017 by Delisha

Physics-Heat
Calculate and compare the temperature changes of copper (specific heat of 0.09c/gC) to glass (Specific heat of 0.20 c/gC) when 535 g of each substance are given 1,500c of thermal energy.
Friday, March 24, 2017 by Anonymous

Calculus
A tank contains 100 grams of a substance dissolved in a large amount of water. The tank is filtered in such a way that water drains from the tank, leaving the substance behind in the tank. Consider the volume of the dissolved substance to be negligible. At what rate is the ...
Tuesday, March 21, 2017 by jau

Calculus
A tank contains 100 grams of a substance dissolved in a large amount of water. The tank is filtered in such a way that water drains from the tank, leaving the substance behind in the tank. Consider the volume of the dissolved substance to be negligible. At what rate is the ...
Tuesday, March 21, 2017 by jau

science
What property must a substance have if you want to use the substance to make aqueous solution
Tuesday, March 21, 2017 by phil

Math
There was a sample of 550 milligrams of a radioactive substance to start a study. Since then, the sample has decayed by 5.2% each year. Let t be the number of years since the start of the study. Let y be the mass of the sample in milligrams. Write an exponential function ...
Sunday, March 19, 2017 by Anonymous

advance physics
A carnot’s engine with air as working substance is initially at 3270C and pressure of 12 atmospheres. The volume is one litre to start with. The expansion or compression ratio is 1:6. Find the lowest temperature and efficiency. (γ= 1.4)
Saturday, March 18, 2017 by anil

Chemistry
Can someone check my answer and let me know me if the are right or wrong. 1. What is the maximum amount of KCl that can dissolve in 600 g of water? (The solubility of KCl is 34 g/100 g H₂O at 20°C.) * 34 g 204 g ***** 2040 g 3. (1 point) If the solubility of a gas in water ...
Monday, March 13, 2017 by Lydia

Science
When a silvery powdery substance was added to boiling beans,the beans get cooked quicker than normal. what may this be?
Friday, March 10, 2017 by Jonathan

Chemistry
Can someone check my answer and let me know me if the are right or wrong. If I wrong can you give me the right answer plz. 1. What is the maximum amount of KCl that can dissolve in 600 g of water? (The solubility of KCl is 34 g/100 g H₂O at 20°C.) * 34 g 204 g 56 g******* ...
Friday, March 10, 2017 by Lydia

Chemistry
Which of these will have a volume of 22.4 L at STP? A) 12.01 g of C(s) B) 16.4 g of CH4(g) C) 36.46 g of HCl(aq) D) 32.05 g of CH3OH(l) E) 22.00 g of CO2(g) I am not really sure how to verify that a particular substance will be at these conditions.
Thursday, March 9, 2017 by Anonymous

Science
1. The current atomic model would be revised if 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. Melinda...
Friday, March 3, 2017 by Homework help

Science
1. In paper chromatography, is the substance being tested the solute or solvent? Explain your answer.  I think the substance being tested is a solvent. I think this because it is being dissolved to form the ink on the filter paper.  2. A bucket of paint spills on your ...
Friday, March 3, 2017 by David

science
1. In paper chromatography, is the substance being tested the solute or solvent? Explain your answer. I think the substance being tested is a solvent. I think this because it is being dissolved to form the ink on the filter paper. 2. A bucket of paint spills on your classroom ...
Thursday, March 2, 2017 by Anonymous

Math
The percent P of a radioactive substance remaining after time t weeks is given by the formula p = 100.(0.5)^1/20 the percent to the nearest whole number of radioactive substance remaining after 30 weeks is?
Wednesday, March 1, 2017 by Help

Chemistry
A scientist studying the reaction between decaborane (B10H18) and oxygen mixed 1.00 x 10^2 grams of decaborane with 2.75 x 10^2 grams of oxygen. Compute the masses of all substance present after the reaction went ot completion, generating B2O2 and water as the only products.
Monday, February 27, 2017 by Scott

Chemistry
A sample of a substance (containing only C, H, and N) is burned in oxygen. 7.961 g of CO2, 1.164 g of H2O and 1.551 g of NO are the sole products of combustion. What is the empirical formula of the compound?
Sunday, February 26, 2017 by Cindy

Chem
A sample of a substance (containing only C, H, and N) is burned in oxygen. 7.961 g of CO2, 1.164 g of H2O and 1.551 g of NO are the sole products of combustion. What is the empirical formula of the compound?
Sunday, February 26, 2017 by Tiffany

Chemistry
A forensic scientist is given a white substance that is thought to be cocaine. The substance is found to have a percent composition: 49.48% C, 5.19% H, 28.85% N, and 16.48% O. What is the empirical formula for this substance? Is it cocaine?
Sunday, February 26, 2017 by Yo

EMpirical and Molecular Formula
A forensic scientist is given a white substance that is thought to be cocaine. The substance is found to have a percent composition: 49.48% H, 5.19% H, 28.85% N, and 16.48% O. What is the empirical formula for this substance? Is it cocaine?
Sunday, February 26, 2017 by Yo

Algebra/Math
How much dry substance is there if we have 150g of 8% of a solution of this substance.
Monday, February 20, 2017 by GeniusTigeress

Chemistry
Is the following a properly written thermochemical equation? 2C8H18 + 25O2 → 16CO2 + 18H2O, ΔH = –5,471 kJ/mol No, the equation does not list the enthalpy of reaction. Yes, the equation is correct. No, the equation does not list the states of each substance. No, the ...
Wednesday, February 15, 2017 by AM

chemistry
one of the ingredients in detergent making, lauryl alcohol is extracted from coconut oil. A 5.00 g of this substance is added to 100 g of benzene and the solution boils at 80.78° C. what is the molar mass of lauryl alcohol?
Sunday, February 12, 2017 by elmer iscal

Science
What effect does observing a substance's physical properties have on the substance?
Thursday, February 9, 2017 by Stepfanie

Science
1) If you let all of the liquid evaporate out of the pitcher, would you be able to see the solid particles of the drink mix? Explain. 2)Compare what happens when a geyser erupts to what happens when a tea kettle whistles. 3)Name something made of aluminum and explain why ...
Wednesday, February 8, 2017 by Stepfanie

science
if a strong odour is smelt continuously for some time the sensation ofsmell of that substance weakness why?
Sunday, February 5, 2017 by adma

Check answers please: Health
1. When reading a recipe's ingredients, which substance makes the recipe an unhealthy choice if it is present in a high amount? A. Fiber B. Protein C. Trans fat*** D. Unsaturated fat 2. Of the five food groups, which one should be consumed in the smallest amount? A. Dairy*** B...
Thursday, February 2, 2017 by ThatOneLoaf

science
The orbits of planets being elliptical was one the planetary laws developed by ==A. Kepler. B. Brahe. C. Ptolemy. D. Copernicus. If a car travels from Town A to Town B on one road at different speeds and stops at red lights, knowing the distance between the towns and the ...
Tuesday, January 31, 2017 by Check answers please

Chemistry
What substance will have the lowest surface tension? A) HOCH2CH2OH B) CH2F2 C) CH3CH2F D) CH3CH2OH E) CH3CH2CH CH3CH3
Friday, January 27, 2017 by KO

Physical Sciences
Is a diamond a pure substance, homogeneous or heterogeneous mixture?
Wednesday, January 25, 2017 by Kgosana Terence

PE
When reading a recipe ingredients, which substance makes the recipe an unhealthy choice if it is present in a high amount? Parentheses are the ones i answered. 1.fiber 2.protein 3.trans fat 4.(unsaturated fat)
Wednesday, January 18, 2017 by Help I need somebody not just anybody

chemistry
which characteristics of solid, a liquid, and a gas are exhibited by each of the following substances? how would you classify each substance? A. a bowl of pudding will be solid and B. a bucketful of sand wiil be solid
Wednesday, January 18, 2017 by eunice

Language Arts
I am having a trouble with a few questions. 4. Which of the following sentences from “Poor Fish” does not support the story’s theme of self-loathing and inferiority? A. “But I looked upon myself as being as fragile as glass, as the thinnest glass, in fact, and that was...
Friday, January 13, 2017 by Abby

math check please
Newton’s law of cooling states that for a cooling substance with initial temperature T0 T 0 , the temperature T(t) T ( t ) after t minutes can be modeled by the equation T(t)=Ts+(T0−Ts)e−kt T ( t ) = T s + ( T 0 − T s ) e − k t , where Ts T s is the surrounding ...
Friday, January 13, 2017 by satan

Chemistry
Label the following changes as CHEMICAL or PHYSICAL change 1. Fat reacting with sodium hydroxide 2. Chemical A originally is buoyant in water; after it mixed with HCI, the new substance now sinks in water Label the following reactions as exothermic or endothermic 1. Ammonium ...
Friday, January 13, 2017 by Megan

Science
Fat reacting with sodium hydroxide Is this a chemical or physical change My answer is chemical is this right answer Chemical A originally is buoyant in water; after it mixed with HCI, the new substance now sinks in water. My answer is physical change. Is this right?
Thursday, January 12, 2017 by PLEASE CHECK MY ANSWER!!!!!!

Health
1. To eat more healthful and decrease your calorie intake, MyPlate recommends that you eat breakfast, lunch, and dinner with no snacks in between meals. eliminate starchy vegetables like potatoes, corn, and lima beans that are high in carbohydrates. drink fruit juice for extra...
Wednesday, January 11, 2017 by Help

science questions please answer at least 45minutes
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. Melinda...
Monday, January 9, 2017 by please answer all this within 45 minutes

Chemistry
CuCO3=CuO +CO2. Find the mass of 1mole of each substance taking part in the reaction. (Ar:Cu=64,C=12,O=16). When 31g of CuCO3 is used; 1)how many grams of CO2 is formed. 2) what mass of solid remains after heating.
Sunday, January 8, 2017 by Busola

Physics
A 100 grams mass of a substance has a volume of 150 centmetre cube.Calculate the relative density of the substanc. [density of water pw=1.0gcm^-3]
Sunday, January 8, 2017 by Angela

chemistry
a sample of gaseous substance at 25 degrees Celsius and 0.862atm has a density of 2.6g/l. what is the molecular weight of the substance?
Friday, December 30, 2016 by Goodness

Calculus
A chemical substance is draining from a conical filtering system at a rate of 100 cubic centimeters per minute into a cylindrical storage tank below. The conical filter and cylindrical tank each have a diameter of 60 centimeters, and the height of the cone also measures 60 ...
Monday, December 19, 2016 by Luke

Chemistry
What is the likely identity of a substance (see Table 10-1) if a sample has a mass of 16.0 g when measured in air and an apparent mass of 15.2 g when submerged in water? Which of the following is it? -copper -gold -lead -aluminum -iron or steal -concrete (Note: Can only select...
Thursday, December 15, 2016 by Dominick

Math algebra
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 15, 2016 by Emily

science
53.94 g of a substance of molecular mass 182 is dissolved in 1000g of water at this temperature.the vapour presser of water is 17.5 mmhg .calculate the vapour presser of this dilute solution
Wednesday, December 14, 2016 by calculate the vapour presser of dilute solution

Physics
A carnot’s engine with air as working substance is initially at 3270C and pressure of 12 atmospheres. The volume is one litre to start with. The expansion or compression ratio is 1:6. Find the lowest temperature and efficiency. (γ= 1.4)
Monday, December 12, 2016 by Avaneesh Narayan Singh

Physics
arnot’s engine with air as working substance is initially at 3270C and pressure of 12 atmospheres. The volume is one litre to start with. The expansion or compression ratio is 1:6. Find the lowest temperature and efficiency. (γ= 1.4)
Sunday, December 11, 2016 by Avaneesh Narayan Singh

Chemistry
This same substance is a gas with a density of 1.25 g/L at 127o C and a pressure of 400 torr. What is its molar mass ?
Sunday, December 11, 2016 by KC

Chemistry
A certain substance has a heat of vaporization of 62.08 kJ/mol. At what Kelvin temperature will the vapor pressure be 4.50 times higher than it was at 361 K? I've gotten it to the point of: ln(4.50)=7466.47423176378616 K (1/361 - 1/T2) Solving for T2 but I don't know where to ...
Wednesday, December 7, 2016 by Anonymous

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/m2...
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. How much heat ...
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 ΔH∘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 ...
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 a ...
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 a ...
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) What substance is...
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

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