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April 20, 2014

Search: chemical

Number of results: 4,298

chemistry
Chemical property becomes evident AFTER a chemical reaction has occured. For example iron has the potential to rust given the right conditions. This is a chemical property. That is a chemical property. While a chemical reaction would be like: Iron rusted.
Wednesday, January 7, 2009 at 8:35pm by =)

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 ...
Thursday, April 15, 2010 at 11:40am 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 = ...
Monday, March 22, 2010 at 7:26pm 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
Wednesday, February 20, 2008 at 6:36pm by lizzie

science
The staement is correct. A new chemical compound is formed in a chemical reaction, and all chemical and physical properties change
Saturday, October 6, 2007 at 11:19pm by drwls

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...
Monday, February 13, 2012 at 7:06pm by student

science chemical changes
Two examples of helpful chemical changes and 2 examples of harmful chemical change. For each chemical change, an example of a "tell-tale" sign.
Monday, November 6, 2006 at 6:59pm by denean

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 ...
Tuesday, March 23, 2010 at 10:30pm by Sara

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?
Thursday, February 9, 2012 at 7:27pm by Shanna

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
Monday, March 22, 2010 at 7:16pm by Sara

chemistry
Physical changes are those that do not involve a change in chemical composition. Some examples are changing the shape of an object, the size of an object, changing its color, its volume, its mass, freezing or boiling water, changing water from liquid to gas, etc. Chemical ...
Wednesday, January 19, 2011 at 11:39am by DrBob222

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 ...
Friday, January 21, 2011 at 11:47pm by Jazmin

science chemical changes
What is the only way that a chemical change can be undone? With another chemical change?
Monday, November 6, 2006 at 6:59pm 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?
Wednesday, March 10, 2010 at 10:00pm by Ana

science
2 types of weathering: -physical (or mechanical)[he disintegration of rocks without changes in their chemical/mineralogic composition] -chemical [any process that changes a rock’s chemical composition]
Tuesday, December 4, 2007 at 7:05pm by Anonymous

science
Your definition is correct. Both physical and chemical changes alter appearance. Chemical changes alter the chemical makeup of the molecules.
Monday, September 17, 2012 at 10:57pm by drwls

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 (...
Wednesday, September 12, 2012 at 9:58pm by Reed

Chemistry
I'm thinking maybe the sparked it made would be a chemical change when it was being burned. Is that another a example of a chemical change? I need one more chemical change. So far I got: 1. Changed from Mg to MgO 2. Made spark when burning 3.
Thursday, January 29, 2009 at 4:45pm by Chopsticks

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. ...
Wednesday, February 14, 2007 at 7:32am by key

Chemistry
Chemical means of fighting oil spills are generally detergents which break up big blobs of oil into small liquid drops that are dispersed and eventually broken down by bacteria. This involves a whole sequence of physical and chemical changes. You can't write a simple chemical ...
Saturday, April 10, 2010 at 5:35pm by GK

chemistry
can you correct me if I am wronge 1.chemical 2.physical 3.chemical 4.chemical 5.physical
Tuesday, February 19, 2008 at 7:35pm by lizzie

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 ...
Tuesday, August 30, 2011 at 6:35pm by Anonymous

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 ...
Sunday, February 9, 2014 at 6:47pm by Steve

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...
Monday, January 23, 2012 at 7:11pm by Staci

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) ...
Tuesday, January 15, 2013 at 1:49pm by thad

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 ...
Monday, March 22, 2010 at 7:21pm by Sara

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 ...
Saturday, September 9, 2006 at 9:53pm by Joe

Chemistry
I wont to get concentartion by using A weight of chemical material and chemical formula.
Monday, July 18, 2011 at 4:07pm by Haider

biology
what is the difference between a chemical that is an irritant compared to a chemical that is corrosive?
Sunday, August 21, 2011 at 4:59pm by josh

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 ...
Monday, September 6, 2010 at 7:32pm by Jack

science
What kind of chemical bonding(chemical elemants) occurs in bricks, elastic, and rope
Thursday, March 15, 2012 at 10:09am by long

physical science
There are no pure chemical elements with those properties. It is most likely a chemical compound.
Tuesday, July 26, 2011 at 6:40pm by drwls

scince thanks
is a chemical reaction and chemical change the same if not what is the difference?
Saturday, October 6, 2007 at 9:02pm by bella

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 ...
Friday, December 2, 2011 at 10:46pm by Fizzylicous

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 ...
Thursday, August 1, 2013 at 11:57am by Kris

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 ...
Wednesday, January 12, 2011 at 3:23pm by candy

chemistry
Water vapor cooling is a physical change, not a chemical change. Does combusting gas to CO2 and H2O count as a chemical change although it isn't part of the paper clip. Did the paper clip change color upon heating? Isn't that a chemical change? What do you think the products ...
Monday, October 26, 2009 at 8:05pm by DrBob222

gr10 science
and how could I write the same equation again using the correct chemical formula for each chemical compound?
Monday, April 25, 2011 at 8:03pm by Rebecca

Science/English
I would look on a chemical supply house site. You can google chemical equipment suppliers
Monday, January 23, 2012 at 7:09pm by DrBob222

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?
Thursday, February 21, 2013 at 6:40pm 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 ...
Monday, May 28, 2012 at 6:20pm 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?
Tuesday, January 3, 2012 at 8:28pm 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?
Saturday, June 25, 2011 at 9:44pm by Penny

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?
Wednesday, January 4, 2012 at 7:13pm 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.
Thursday, April 19, 2007 at 8:40pm by Anonymous

Chemistry
The HF is attacking the glass and making a new compound(s). So it must be a chemical reaction; therefore, a chemical change.
Saturday, February 16, 2008 at 2:07pm by DrBob222

chemistry
how is a chemical mixture distinguished from a chemical compound?
Monday, March 3, 2008 at 7:26pm by anthony

biology
It is a chemical molecule which facilitates a chemical reaction.
Sunday, September 5, 2010 at 2:01pm by bobpursley

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 ...
Monday, September 20, 2010 at 12:32pm by Anonymous

chemistry
In terms of chemical bonds and electrons, what kinds of changes occur between atoms when substances undego chemical reactions?
Monday, November 24, 2008 at 4:29pm by Akshay

science
__________ rocks forms when a rock is changed by heart,pressure, or chemical reactions. a) Igneous b) Sedimentary c) Metamorphic d) Chemical
Wednesday, January 8, 2014 at 4:08am by Victoria

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?
Saturday, June 25, 2011 at 9:44pm 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?
Thursday, July 21, 2011 at 10:06am 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
Saturday, September 22, 2012 at 5:51pm 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
Friday, October 22, 2010 at 2:27am by Anonymous

Science
radiation and conduction are not chemical changes. One chemical change is combustion,fuel is burning in air to produce heat, carbon dioxide and water. The other chemical change is in the bbq itself. Heat is breaking down the protein bonds in the meat to make it tender, and ...
Wednesday, March 11, 2009 at 5:44pm by bobpursley

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 7:22pm by Rezu

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.
Thursday, October 8, 2009 at 1:24am by ana

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 ...
Wednesday, September 30, 2009 at 8:08pm 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?
Friday, April 5, 2013 at 4:38pm by Ann

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 property ...
Friday, April 23, 2010 at 5:59pm by Help1001

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 social...
Monday, November 23, 2009 at 9:06pm by anonymous

Science (8th grade)
in terms of chemical bonds anfd electrons, what kinds of changes occur between atoms when substances undergo chemical reactions?
Wednesday, October 22, 2008 at 7:04pm by lindsey

Science
If you cannot figure this out on your own then you do not need to be a Chemical Engineer. Pick a different major. Question 2.2.10 Basic Principles and Calculations In Chemical Engineering
Saturday, August 25, 2012 at 4:37pm by anonymous

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
Monday, May 6, 2013 at 5:45pm by Dave

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 ...
Thursday, May 17, 2007 at 9:41pm by Katie

Chemistry
Odor is a chemical property because it is related to chemical composition. When a material is mixed with other materials and/or heated, and a new odor is detected, that means a new substance has been formed. Any change that produces one or more new substances is a chemical ...
Thursday, May 28, 2009 at 6:40pm by GK

science
A physical change is the wax melting and a chemical change is when it lets out heat and light energy - I think.... The difference between a physical and a chemical change is that you can see the physical changes but but you can't really see the chemical changes. The reactants ...
Saturday, October 21, 2006 at 10:00am by duckwithnoname

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 ...
Thursday, September 10, 2009 at 3:48pm by muffy

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
Tuesday, February 5, 2008 at 6:09pm 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...
Thursday, November 30, 2006 at 8:14pm by Pretty in Pink

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 ...
Wednesday, October 15, 2008 at 8:33pm 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 ...
Tuesday, July 17, 2012 at 4:17pm by Hannah

Science help
6.)Table salt has the chemical formula NaCl. Table sugar has the chemical formula C12 H22 O11. Which of the following is true? a) Both compounds are held together by chemical bonds. ** b) Both compounds have the same density. c) Both compounds react with water. d) Both ...
Monday, March 10, 2014 at 2:11pm by #1Student

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!!
Friday, June 19, 2009 at 12:51am by Scott

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.
Thursday, December 19, 2013 at 9:59pm by Lily

Science
There may be many indicators of a chemical change. Here are a few although not all can categorically indicate a chemical change: •Gas or bubbles are formed •Heat, light, or sound is given off •Change in color •Different taste or smell (never taste or smell anything in a ...
Wednesday, January 18, 2012 at 8:25pm by Laruen

science
im stuck im 11 i have a twin she is more cleaver she told me that Their is a phisical change the phisical change is the wax starts to melt.The chemical change is the light and heat energy is produced .thier is a diffeence beetween a phisical and a chemical the difference is ...
Friday, October 20, 2006 at 2:34pm by Tia

Physics
i think it is chemical to mechanical. feel this when the battery is dying the chemical energy is converted to mechanical which help the watch to move
Tuesday, March 16, 2010 at 10:24am by Aanu

SCIENCE
Is a forest fire a natural chemical change? Please help me find some other natural chemical changes. Thank you!
Thursday, November 11, 2010 at 9:51pm by Pratigya

Science--Chemistry
URGENT!!! what is the chemical reaction of hyrodgen peroxide + NH3 ... The chemical formula and written formula!!
Thursday, October 2, 2008 at 11:02pm by tiffany

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 ...
Tuesday, January 7, 2014 at 1:27pm by Someone

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 ...
Tuesday, December 22, 2009 at 12:36am by Sarah

chemistry
URGENT!!! what is the chemical reaction of hyrodgen peroxide + NH3 ... The chemical formula and written formula!!
Thursday, October 2, 2008 at 11:23pm by tiffany

Chemistry
Also, is the white powder a chemical change? since color changing is a chemical change.
Thursday, January 29, 2009 at 7:06pm by Chopsticks

chemisty
when looking at a chemical equation what are the evidences that a chemical reaction has occured. Or what is the evidence that it has not occured thanks:):) <3
Wednesday, December 8, 2010 at 5:39pm by hannah

chemistry
The process that uses electricity to decompose chemical compounds/prepare new chemical compounds
Thursday, April 28, 2011 at 6:38am by Anonymous

SCIENCE
THE PROCESS THAT USES ELECTRICITY TO DECOMPOSE CHEMICAL COMPOUNDS/ PREPARE NEW CHEMICAL COMPOUNDS
Monday, May 2, 2011 at 9:05am 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 ...
Tuesday, January 7, 2014 at 12:37pm by Someone

College Chemistry
I am assuming its a liquid. My question is writing the chemical equation. What is the chemical equation? Is it C6H6 + O2 ---> CO2 + H2O? And if so how do I balance it?
Sunday, September 25, 2011 at 5:57pm by Jenny

science
This site gives you several clues about chemical changes -- odor changes, color changes, and more. http://www.ric.edu/faculty/ptiskus/chemical/
Tuesday, March 4, 2008 at 10:07pm by Ms. Sue

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 ...
Friday, January 10, 2014 at 12:31pm by Anonymous

science
List at least three physical properties of water which contain numerical values. Describe a chemical proterty of water which involves a chemical reaction.
Thursday, January 22, 2009 at 11:02am by Yasmin

Chemistry
Is this the right way to write the structual and the chemical formula for propane? P P P P P C C C C P P P P P Pretend that there are bonds in between each of the letters. Chemical Formula: C3P8. Thanks for checking this out.
Saturday, May 2, 2009 at 3:23pm by Hallie

science
Chemical fertilizers stimulate plant growth; but if the concentration is too high, they may damage roots. What precautions concerning chemical fertilizers must a gardener take?
Wednesday, January 18, 2012 at 9:46am by Valerie

science
Chemical fertilizers stimulate plant growth; but if the concentration is too high, they may damage roots. What precautions concerning chemical fertilizers must a gardener take?
Wednesday, September 19, 2012 at 3:27pm by Anonymous

9th grade
how can a egg be a chemical change? How can an antacid tablet be a physical and a chemical change?
Thursday, September 23, 2010 at 4:50pm by Nichole

Science
well i looked at the websites and i did not see any chemical properties. i am just looking for the chemical properties.
Thursday, November 7, 2013 at 4:15pm by Anonymous

Chemistry
Give three examples each of household items that have: a. different structures and exhibit different properties b. same chemical make-up composition but a different structure, hence, different properties c. the same properties but with different chemical composition (If ...
Thursday, July 11, 2013 at 5:45am by Eliza

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.
Wednesday, February 18, 2009 at 5:23pm by Anonymous

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