Busy. Please wait.
or
show password
Forgot Password?
Don't have an account?  Sign up 
or
Username is available taken
show password

why


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account. We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
Don't know
Know
remaining cards
Save
0:01
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
Retries:
restart all cards
<embed>
apps
export
edit
print
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Chemical Reaction

Science

TermDefinition
Chemistry the study of the properties of matter and how matter changes.
element a substance that cannot be broken down into any other substances by chemical or physical means.
compound a substance made of two or more elements chemically combined in a specific ratio, or proportion.
mixture made from two or more pure substances - elements, compounds, or both - that are in the same place but not combined as a new material.
solution a well-mixed mixture
physical change a change that alters the form or appearance of a material but does not make the material into another substance.
chemical change a change in matter that produces new substances.
precipitate a solid that forms from solution during a chemical reaction.
atom the smallest particle of an element.
molecule a combination of two or more atoms.
chemical bond the force that holds atoms together.
chemical equation a shorter, easier way to show chemical reactions, using symbols instead of words.
symbol a one-letter or two-letter representation of an element.
chemical formula a 'word' representing a compound which shows the ratio of elements in the compound.
subscript shows the number of atoms of an element in a molecule.
reactants the materials you have at the beginning of a chemical reaction
products the different materials formed when a reaction is complete
conservation of matter the principle that matter is not created or destroyed during a chemical reaction.
coefficient a number in front of a chemical formula in the equation.
synthesis when two or more substances (elements or compounds) combine to make a more complex substance.
decomposition reaction breaks down compounds into simpler products.
replacement reaction a reaction in which one element replaces another in a compound or in which two elements in different compounds trade places.
exothermic reaction a reaction that releases energy in the form of heat.
endothermic reaction a reaction that absorbs energy.
activation energy the minimum amount of energy that has to be added to start a reaction.
concentration the amount of one material in a given volume of another material.
catalyst a material that increases the rate of a reaction by lowering the activation energy.
enzymes provide a surface on which reactions take place.
combustion a rapid reaction between oxygen and a substance called a fuel.
fuel a material that releases energy when it burn.
Created by: lhummingbird