Sunday
March 26, 2017

Number of results: 4,057

algebra (urgent help needed)
1. a chemical compound requires 8 ounces of chemical a and 12 ounces of chemical b. a mixture contains 24 ounces of chemical a and 30 ounces of chemical b. how can you fix the mixture to make the chemical compound?
April 20, 2015 by jasp

algebra
1. a chemical compound requires 8 ounces of chemical a and 12 ounces of chemical b. a mixture contains 24 ounces of chemical a and 30 ounces of chemical b. how can you fix the mixture to make the chemical compound? 2. in an animal shelter, the ratio of cats to dogs is 5 to 3. ...
April 17, 2015 by leya

biology
Which of the following is true about the relationship between energy and chemical reactions? Activation energy is required for a chemical reaction to occur. Activitation energy is not necessary in a chemical reaction which releases energy. Chemical bonds are always broken by ...
April 15, 2010 by ballamoney1

Changes in Matter
Which of the following geological changes are physical changes and which are chemical changes? a)formation of a limestone cave b)creation of a canyon by a river c)wearing of rocks by wave action d)destruction of lakes by acid rain e)heaving of the ground by ice formation a = ...
March 22, 2010 by Sara

chemistry
Classify the following properties of ozones as physical or chemical: 1.bluish color 2.pungent odor 3.reactive towards oxygen 4.decomposes to oxygen on exposure to ultraviolet light 5.it is a gas Is this correct? 1.chemical 2.physical 3.chemical 4.chemical 5.phsical
February 20, 2008 by lizzie

environmental engineering
A lake receives 8 m3/s of inflow containing 0.3 mol/m3 of a chemical. The chemical reacts with a first order rate constant of 0.01 h-1. The outflow from the lake is also 8 m3/s. Assume there was no chemical in the lake at the beginning and volume of the lake is 106 m3. What ...
February 10, 2016 by Sam

chemistry
You react chemical A with chemical B to make one product. It takes 100 grams of chemical A to react completely with 20 grams of chemical B. What is true about the chemical properties of the product? a. the properties are more like those of chemical A b. the properties are more...
February 13, 2012 by student

cost finance
1. X is the manufacture of Mumbai purchased three chemicals A, B and C from U.P.The bill gave the following information: Chemical A: 6000 kgs @ Rs. 4.20 per kg Rs 25,200 Chemical B: 10000 kgs @ Rs. 3.80 per kg 38,000 Chemical C: 4000 kgs @ Rs. 4.75 per kg 19,000 VAT 2,055 ...
August 30, 2011 by Anonymous

Math Lit
One 250mg tablet is made up of chemical A , B, ,C in a ratio 3:2:5. The Pharmacist Has 60mg of chemical B left. How much of Chemical A and C does she need if she uses 60mg of B?
February 9, 2012 by Shanna

Science
We did a experiment in class to recognize chemical change. I don't really get this question: Identify the combinations of chemicals in which chemical changes occurred. If the chemical changes occured in all of the combinations, then what would be a good answer? I get the ...
March 23, 2010 by Sara

Changes in Matter
Which of the following kitchen activities are physical changes, and which are chemical changes? a)cooking bacon-chemical b)making icing-physical c)baking a cake-chemical d)using oven cleaner-chemical e)making whipped cream-physical Please correct me if I'm wrong, thanks
March 22, 2010 by Sara

chemistry
What is the difference between biochemical, pharmaceutical, and diagnostic chemical reactions in healthcare? What is a specific example that exists for each of these chemical reaction types above and why might it be of importance to healthcare professionals? List a balanced ...
May 16, 2014 by slomomo

chemistry
A chemical is placed in a beaker containing 20 g of soil and 500 mL of water. At equilibrium, the chemical is found in the soil at a concentration of 100 mg/kg of soil. The equilibrium concentration of this same chemical in the water is 250 µg/L. Calculate the partition ...
January 21, 2011 by Jazmin

science chemical changes
What is the only way that a chemical change can be undone? With another chemical change?
November 6, 2006 by bob

Chemistry
In stoichiometry, chemists are mainly concerned with a. types of bonds found in compounds b. energy changes occuring in chemical reactions c. mass relationships in chemical reactions d. speed with which chemical reactions occur i thought c?
March 10, 2010 by Ana

Chemistry
What is the difference between a chemical change and a chemical reaction?? My answer: A chemical change leads to a solidifed chemical reaction but more or less they are the same thing because it's a change in which one or more pure substances are converted into diffeent pure ...
September 6, 2015 by Sam

Science
A chemical element with the symbol X has the electron arrangement 2,8,6 (electron configuration 1s2 2s2 2p6 3s2 3p4). Which chemical species is this chemical element most likely to form?
October 7, 2016 by Blsh

science
Will you please check a few more? Physical change, chemical change or both kinds of change? 1. Sodium hydroxide dissolves in water (both) 2. Hydrochloric acid reacts with sodium hydroxide to produce a salt, water and heat (chemical) 3. A pellet of sodium is sliced in two (...
September 12, 2012 by Reed

math
A scientist is mixing a chemical solution for an experiment. The solution contains 3/8oz of chemical and 1/6 ounce saline solution. What is the rate of chemical to saline?
December 18, 2014 by Eli

chemistry
what are some the different types of chemical reactions that occur on a daily basis our lives? wouldnt there be many? eating, taking medications, would emotion be or cause chemical reaction? All of the above. Add breathing. Don't forget the cars we drive, the clothes we wear. ...
February 14, 2007 by key

Physics- Energy Released In Chemical Reaction
The reaction between two hydrogen isotopes is shown below: 2H + 3H → 4He + n + energy released The energy released in this reaction is: a.equal to that in a fission reaction b.equal to that in a chemical reaction. c.less than that in a chemical reaction. d.greater than that ...
December 15, 2016 by MM

Science
Which of the following is true about chemical energy? A. Chemical energy can be stored more efficiently as glucose than it can be as ATP B. Chemical energy is stored when bonds in ATP are broken to form ADP C. Chemical energy is released when bonds in ADP are broken to form ...
April 12, 2016 by Jae

Chemistry-help
How does a "chemical for synthesis" compare with the same chemical(ACS grade)when used in analytical testing? Posted by candy on Tuesday, January 11, 2011 at 2:10pm. Chemicals are supplied in different grades,e.g. ACS,AR...etc.What do we mean when we say that the chemical is ...
January 12, 2011 by candy

Science
What did Antoine Lavoisier’s experiments demonstrate? a- Atoms always split into pairs during a chemical change. b- Mass is neither lost nor gained during a chemical change. c- Matter can be created during a chemical change. d- Energy is neither lost nor gained during a ...
February 9, 2014 by Steve

math
scientist is mixing a chemical solution for an experiment solution contains 3/8 of chemical solution 1/6 ounce saline solution what is the unit rate of chemical to saline solution? 3/8 x 1/6 + 3/48 divided by 3 + 1/16 is this right
March 16, 2015 by Joshiah

Chemistry
You have a chemical sealed in a glass container filled with air. The glass container has a mass of 200.0 grams and the chemical has a mass of 850 grams. The total mass of the setup is 1050 grams. The chemical is ignited by means of a magnifying glass focusing sunlight onto the...
January 23, 2012 by Staci

chemistry
You have a chemical sealed in a glass container filled with air. The glass container has a mass of 200.0 grams and the chemical has a mass of 800 grams. The total mass of the set-up is 1000 grams. The chemical is ignited by means of a magnifying glass focusing sunlight onto ...
August 1, 2013 by Kris

chem help
i just don't know where to begin/how a) Write a balanced chemical equation for: potassium carbonate + magnesium chloride b) Write a balanced chemical equation for: sulfuric acid + calcium carbonate c) Write a balanced chemical equation for: sodium sulfate + calcium nitrate d) ...

Changes in Matter
Which of the following everyday activities are physical changes, and which are chemical changes? a)salting ice on a driveway b)burning leaves c)mixing sand with soil d)composting cut vegetation e)using a glue gun a = physical b = chemical c = ? d = ? e = chemical Please ...
March 22, 2010 by Sara

chemistry
Which of the following properties is a chemical property of phosphorus? Answer a) it burns in air b) it is a white waxy solid c) it melts to form a viscous liquid at 44.1 oC d) Both a and c are both examples of chemical properties. e) a, b, and c are examples of chemical ...
September 6, 2010 by Jack

Chemistry
Are the following physical or chemical: a. dew is dried by the sun a dark cloth is faded by the sunlight c. grape juice is converted to wine d. soap is dissolved in water a.physical b.physical c.chemical d.chemical Physical changes are those in which the substance is not ...
September 9, 2006 by Joe

Chemistry
I wont to get concentartion by using A weight of chemical material and chemical formula.
July 18, 2011 by Haider

biology
what is the difference between a chemical that is an irritant compared to a chemical that is corrosive?
August 21, 2011 by josh

Science
True or False Another name for chemical change is chemical bond
January 22, 2015 by M

science
What kind of chemical bonding(chemical elemants) occurs in bricks, elastic, and rope
March 15, 2012 by long

chemistry
What is the balanced chemical equation of Shampoo? And what is the chemical reaction of it? Please i need a help ASAP! Thank you!
November 26, 2014 by krisha

Chemistry
Give a chemical test for carbon(2) oxide and illustrate your answer with chemical equation
May 20, 2015 by Yaseerah

Chemical Equations
Starting with nitrogen and hydrogen, millions of kilograms of ammonia are produced every year for use as a fertilizer. Use this info to answer the next 3 questions. Communicate the balanced chemical equation using molecular models. Communicate the balanced chemical equation ...
December 2, 2011 by Fizzylicous

Physical science
Is a chemical reaction the same as a chemical change i need to know so that i can plug it in to answer a question
January 18, 2015 by Sonnie

scince thanks
is a chemical reaction and chemical change the same if not what is the difference?
October 6, 2007 by bella

college chemistry
how to make a 1:8 dilution of chemical Y. You have 350 mililiters of chemical Y. how much diluent do you need?
February 21, 2013 by chuck

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 a chemical ...
May 28, 2012 by Jude

General chemistry
Discuss in detail the healthcare applications of chemical reactions. Which chemical reactions would you consider to be of importance to healthcare professionals? Why? In which situations are these chemical reactions useful to healthcare professionals?
January 3, 2012 by Norma

general chemistry
Discuss in detail the healthcare applications of chemical reactions. Which chemical reactions would you consider to be of importance to healthcare professionals? Why? In which situations are these chemical reactions useful to healthcare professionals?
January 4, 2012 by Norma

Chemistry
The ripening of a banana in which the skin turns yellow and it tastes sweet is an example of what change??? physical or chemical????? Chemical.
April 19, 2007 by Anonymous

chemistry
Suppose 100 moles of a chemical is spilled into a lake. After 15.0 days, the total amount of the chemical in the lake 3.50 moles. Assuming that the reaction followed first order kinetics and no chemical was lost due to advection or volatilization, then what is the rate ...
February 14, 2015 by danny

chemistry
how is a chemical mixture distinguished from a chemical compound?
March 3, 2008 by anthony

physics
We use many chemicals in our daily lives. How can these chemicals affect you and what can you do to minimize these effects? The chemical industry is enormous in the industrialized world. How has society benefitted from advances in the chemical industry? What negative effects ...
September 20, 2010 by Anonymous

Science 6
When you turn on a battery powered flashlight, you transform... A:heat energy into light and chemical energy. B:chemical energy into electrical energy and light. C:heat energy into chemical energy and light. D:eletrical energy and light energy into chemical energy. I think B ...

chemistry
In terms of chemical bonds and electrons, what kinds of changes occur between atoms when substances undego chemical reactions?
November 24, 2008 by Akshay

science
__________ rocks forms when a rock is changed by heart,pressure, or chemical reactions. a) Igneous b) Sedimentary c) Metamorphic d) Chemical
January 8, 2014 by Victoria

Calculus
Write a differential equation equivalent to "A chemical decomposition proceeds at a rate equal to the square of the amount of chemical present"
May 18, 2016 by Arie

chemistry
Discuss in detail the healthcare applications of chemical reactions. Which chemical reactions would you consider to be of importance to healthcare professionals? Why? In which situations are these chemical reactions useful to healthcare professionals?
June 25, 2011 by mema

CHEMISTRY
Discuss in detail the healthcare applications of chemical reactions. Which chemical reactions would you consider to be of importance to healthcare professionals? Why? In which situations are these chemical reactions useful to healthcare professionals?
July 21, 2011 by anne

chemistry
Discuss in detail the healthcare applications of chemical reactions. Which chemical reactions would you consider to be of importance to healthcare professionals? Why? In which situations are these chemical reactions useful to healthcare professionals
September 22, 2012 by sonwia

Biology
Which process may not reduce the toxicity of a chemical in the body? Sequestration Chemical bond formation Elimination Blood flow to tissue/organ
October 22, 2010 by Anonymous

science
__________ rocks forms when a rock is changed by heart,pressure, or chemical reactions. a) Igneous b) Sedimentary c) Metamorphic d) Chemical i think its c

integrated physics and chem
Element A and element B have bonded and formed compound AB. Which of the following statements is true? A. Compound AB has chemical and physical properties that are completely different from those of A and B. B. Compound AB has chemical and physical properties that are a blend ...
January 10, 2014 by Anonymous

Economics-HELP!
1. Consider testing of chemicals for potential carcinogens. To properly test each chemical costs \$10 million. If Q chemicals are tested a typical household places value \$(1 - 0.01×Q) on each chemical tested. There are 100 million households in the U.S. (a) Calculate the ...
November 23, 2009 by anonymous

Chemistry-Dr.Bob
Since most chemical reactions are conducted in containers open to the armisphere, why is the energy transfer associated with a chemical reaction generally expressed as the change in enthalpy? Is it because the enthalpy of reaction measures the change in energy of a chemical ...
January 10, 2016 by Sanaya

chemistry
I did an experiment where i used straws and water to simulate a chemical equilibrium. what other differences are there between a real chemical equilibirum and my exeriemtal one.
October 8, 2009 by ana

Chemical engineeing
Can someone help me with online exam ( fundamental of chemical engineering class ) ? Please eamil me ( davd_jo(at)(ya h o o )dot (com ) I'll offer money
May 6, 2013 by Dave

science
What properties of carbon explain carbon's ability to form many different macromolecules? What happens to chemical bonds during chemical reactions? Describe the role of energy in chemical reactions what are enzymes, and how are they important to living things? describe how ...
September 30, 2009 by alec

Math
A scientist is mixing a chemical solution for an experiment. The solution contains 3/8 ounce of a chemical and 1/6 ounce saline solution. What is the unit rate of chemical to saline solution?
April 5, 2013 by Ann

science
I did a hydrate lab in school and these were my results and at the end we have to write the correc formula for the hydrate but I know the answer at the end is supposed to be 5H2O so why do I keep getting 4H2O? Can someone double check my work Mass of evaporating dish 35.88 ...
April 1, 2009 by cara

Chem Lab
Am I right? Classify the following properties of sodium metal as physical or chemical: •Silver metallic color—physical property •Turns gray in air—physical property •Melts at 98º C-melting point is physical property •Reacts explosively with chlorine gas—chemical...
April 23, 2010 by Help1001

chem
what occurs when an atom of clorine and an atom of hydrogen become a molecule of hydrogen chloride? a a chemical bond is broken and energy is released b a chemical bond is formed and energy is absorbed c a chemical bond is formed and energry is released d a chemical bond is ...
May 17, 2007 by Katie

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?

IPC
Element A and element B have bonded and formed compound AB. Which of the following statements is true? A) Compound AB has chemical and physical properties that are completely different from those of A and B. B) Compound AB has chemical and physical properties that are a blend ...
November 4, 2010 by Kaitlin

biology
I have some questions that relate to table 2.1 which lists the chemical elements that occur naturally in the human body. Similar percentages of these elements are found in most living organisms. a. In what abiotic (non-life) chemical forms are these elements often found in ...
September 10, 2009 by muffy

Biology(Anatomy&Physiology)
1)Which organelle makes most ATP 2)The chemical reaction that joins two amino acids is called 3)In a single molecule of water which type of bond holds the H to the O? 4)Which type of chemical bond results from the transfer of an electron from one atom to another 5)A chemical ...
October 15, 2008 by Stephanie

Chemistry
Describe what hard water is and how a water softening unit works. Provide balanced chemical equations to show how sodium sulphate can remove these ions (Magnesium and Calcium). The first was no problem, but I am having trouble trying to get through the second part balancing ...
July 17, 2012 by Hannah

OChem
Calculate the amount (volume) of 5.25% (wt./vol.) NaOCl solution (commercial bleach) required to oxidize 100 mg of 9-fluorenol to 9-fluorenone. Whenever appropriate, use balanced chemical equations as a part of your calculation. I know that I need to start off with the ...
December 22, 2009 by Sarah

Science
When you boil an egg, the egg "white" changes from clear to white. The egg also becomes "hard boiled." What type of changes are occurring in the egg? A.Chemical B.Neither physical nor chemical C.Physical D.Physical and Chemical
February 5, 2008 by jika

Chemistry
What are charateristic of a ionic bond and a chemical bond? Answered below for characteristics of ionic bonds. I don't understand characteristics of chemical bond since an ionic bond is a chemical bond. Perhaps you can rephrase your question. For my partial answer look on this...
November 30, 2006 by Pretty in Pink

Physical Science
Which of the following statements are true about chemical reactions? Check all that apply. A. Reactants are on the right when writing a chemical reaction. B. Products are produced in a reaction. C. Reactants are present at the end of a reaction. D. Products are on the right ...
January 27, 2015 by jen

Chemistry
when heated, sulfuric acid will decompose into sulfur trioxide and water. Write a chemical equation, using words, to represent this chemical reaction. Identify reactants and products. (I'm having trouble identifying the reactants and products & writing the chemical equation in...
September 6, 2015 by Sam

I am extremely confused on how to balance a chemical equation. I have an exam tomorrow and I'm lost. In the book it says Chemical Equation: CH4 + O2 > CO2 + H2O Balanced Chemical Equation: CH2 + 2O2 > CO2 + 2H2O How did this happen? Thanks. Oh and what is the main rule ...
January 23, 2017 by :)

Science
Table salt has the chemical formula NaCl. Table sugar has the chemical formula C12H22O11. Which of the following is true? (1 point) Both compounds are held together by chemical bonds. Both compounds have the same density. Both compounds react with water. Both compounds contain...
January 28, 2016 by Vanessa

Science
Table salt has the chemical formula NaCl. Table sugar has the chemical formula C12H22O11. Which of the following is true? (1 point) Both compounds are held together by chemical bonds. Both compounds have the same density. Both compounds react with water. Both compounds contain...
January 28, 2016 by Del Rey

Science
Plz Correct me!! Table salt has the chemical formula NaCl. Table sugar has the chemical formula C12H22O11. Which of the following is true? (1 point) Both compounds are held together by chemical bonds. Both compounds have the same density. Both compounds react with water. Both ...
January 28, 2016 by Vanessa

physics
You set your stationary bike on a high 80 N friction like resistive force and cycle for 30 min at speed of 8 m/s. Your body is 10% efficient at converting chemical energy in your body into mechanical work. What is your internal chemical energy change? How long must you bike to...
January 20, 2015 by bill

Science
A persistent organic pollutant is estimated to have a half-life of 30y. If 3 tonnes of the chemical exists in a polluted area today, how much of the chemical will remain after 120y.
December 19, 2013 by Lily

chemistry
Which statement best describes what must occur for two atoms to combine to form a chemical bond? A. The electrons of one nucleus must transfer to the nucleus of the second atom for a chemical bond to form. B. The repulsive forces of both nuclei must overcome their attractive ...
December 15, 2014 by Morgan

chemistry
If the molecular mass for a chemical is 64.10 g/mol and the enthalpy of formation is -63 kJ/mol, the heat change will be _____kJ when 10.0 g of this chemical is formed.
February 23, 2009 by tweety

SCIENCE
Is a forest fire a natural chemical change? Please help me find some other natural chemical changes. Thank you!
November 11, 2010 by Pratigya

Biology
Q1. What enzyme could you use to break down the major chemical in the cell wall? A: EDTA but it's not an enzyme Q2. What chemical would you use to break down the major chemical in the cell membrane? A: something like lipases? Please help!!
June 19, 2009 by Scott

Chemistry
f the molecular mass for a chemical is 153.82 g/mol and the enthalpy of formation is -135 kJ/mol, the heat change will be kJ when 10.0 g of this chemical is formed.
February 22, 2010 by Taylor

Chem
f the molecular mass for a chemical is 352.04 g/mol and the enthalpy of formation is -2137 kJ/mol, the heat change will be kJ when 10.0 g of this chemical is formed.
May 17, 2010 by Andrew

Chemistry
If the molecular mass for a chemical is 153.82 g/mol and the enthalpy of formation is -135 kJ/mol, the heat change will be ____kJ when 10.0 g of this chemical is formed.
February 18, 2009 by Anonymous

Chemistry
If the molecular mass for a chemical is 153.82 g/mol and the enthalpy of formation is -135 kJ/mol, the heat change will be_______kJ when 10.0 g of this chemical is formed.
May 14, 2009 by Linda

Chemistry
If the molecular mass for a chemical is 153.82 g/mol and the enthalpy of formation is -135 kJ/mol, the heat change will be _____ kJ when 10.0 g of this chemical is formed.
February 20, 2010 by Stuck

Chem
f the molecular mass for a chemical is 352.04 g/mol and the enthalpy of formation is -2137 kJ/mol, the heat change will be ______ kJ when 10.0 g of this chemical is formed.
May 17, 2010 by Andrew

Chemistry
If the molecular mass for a chemical is 151.97 g/mol and the enthalpy of formation is -1128 kJ/mol, the heat change will be _______kJ when 10.0 g of this chemical is formed.
February 18, 2011 by HELP!

chemistry-chemical equations
How do I write the balanced chemical equation for Copper +nitric acid -> copper(II)nitrate+ nitrogen dioxide + water
November 30, 2014 by Anonymous

SCIENCE HELP PLZZZZZ! ONLY ONE QUESTION!
Which of the following correctly describes how nerve impulses move throughout the body? A. Electrical transmission through neurons and elecrical transmission between neurons. B. Chemical transmission through neutrons and chemical transmission between neutons. C. Chemical ...
January 7, 2014 by Someone

chemistry
URGENT!!! what is the chemical reaction of hyrodgen peroxide + NH3 ... The chemical formula and written formula!!
October 2, 2008 by tiffany

chemistry
The process that uses electricity to decompose chemical compounds/prepare new chemical compounds
April 28, 2011 by Anonymous

SCIENCE
THE PROCESS THAT USES ELECTRICITY TO DECOMPOSE CHEMICAL COMPOUNDS/ PREPARE NEW CHEMICAL COMPOUNDS
May 2, 2011 by SEKAMOTHO

SCIENCE HELP! ONLY ONE QUESTION!
Which of the following correctly describes how nerve impulses move throughout the body? A. Electrical transmission through neurons and elecrical transmission between neurons. B. Chemical transmission through neutrons and chemical transmission between neutons. C. Chemical ...
January 7, 2014 by Someone

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