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 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

Changes in Matter

Chapter 2 Section 3 Physical Science

questionanswer
Physical Change A change in a substance that does not change its identity.
Chemical Change A change in which one or more substances combine or break apart to form new substances.
Law of Conservation of Mass The principle that the total amount of matter is neither created or destroyed during a chemical or physical change.
Energy The ability to do work or cause change.
Temperature A measure of the average energy of motion of particles of a substance.
Thermal Energy The total potential and kinetic energy of the particles in an object.
Endothermic Change A change in which energy is taken in.
Exothermic Change A change in which energy is given off.
Why is the melting of an ice cube called a physical change? When an ice cube melts, it is still water.
Why is combustion classified as a chemical change? Combustion involves the rapid combination of a fuel with oxygen to produce new substances.
Identify three different kinds of physical change that could happen to a plastic spoon. bend the spoon, break it in pieces, and melt it.
Which of the following processes is not a physical change; drying wet clothes, cutting snowflakes out of paper, lighting a match from a matchbook? lighting a match is not a physical change.
What evidence would you look for to determine whether a chemical change has occurred? If a new substance is formed, a chemical change has occurred.
Why is the electrolysis of water classified as a chemical change but the freezing of water is not? in electrolysis, water is broken down into hydrogen and oxygen ,two different substances. When water freezes, it is the same substance, but in a different form.
Explain why the mass of a rusted nail would be greater than the mass of the nail before it rusted. Assume that all the rust is still attached to the nail. During rusting, oxygen in the air combines with iron in the nail. The rusted nail has atoms of oxygen that the nail did not have before it ruted.
What is thermal energy? Thermal energy is the total energy of all the particles in an object.
How can you tell whether one glass of water has more thermal energy than another, identical glass of water? If the temperatures are different, the glass of water with the higher temperature has the greater thermal energy.
How might you cause an endothermic chemical change to begin and keep going? You have to add thermal energy.
Created by: Tom Radeke