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.

By signing up, I agree to StudyStack's Terms of Service and Privacy Policy.


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.

Remove ads
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




share
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

SCI-7 U2

All Words

TermDefinition
matter Anything around us that has mass and volume.
atom The smallest piece of matter that still has all of the properties of that matter.
molecule A group of atoms that are chemically joined together and act as a unit. Must contain at least two atoms, but they may be two atoms of the same element.
density The amount of mass in an object’s volume.
conductivity The physical property of matter that describes how well a substance conducts electricity.
flammability The chemical property of matter that describes the matter's ability to burn.
reactivity The chemical property of matter that describes the rate at which the matter will undergo a chemical change or chemical reaction.
pH The chemical property of matter that describes the acidity or basicity of that matter.
solid The phase of matter that has definite shape and definite volume, is incompressible, and the atoms or molecules are tightly packed and do not have much room between them.
liquid The phase of matter that has definite volume, but no definite shape, is incompressible, and the atoms or molecules are more spread out and have some room between them.
gas The phase of matter that has no definite shape or definite volume, is compressible, and the atoms or molecules spread very far apart and have the most space between them.
plasma The phase of matter that is a super-heated gas that has no definite shape or definite volume, is compressible, the atoms or molecules spread very far apart and have the most space between them, and electrons are lost from the atoms.
melting Occurs when heat energy is added to a solid, causing its atoms or molecules to move faster and faster, becoming a liquid.
freezing Occurs when the molecules or atoms of a liquid lose heat energy, making them slow down to form a solid.
vaporization Occurs when the molecules of a liquid are heated. The molecules move faster and further apart, becoming a gas.
condensation Occurs when the molecules of a gas lose heat energy. This makes them slow down and move closer together, forming a liquid.
deposition Occurs when a gas changes directly into a solid without ever going through the liquid phase. Only a few common substances do this.
sublimation Occurs when a solid changes directly into a gas without ever going through the liquid phase. Only a few common substances do this.
phase change The process of matter changing from one phase to another.
elements The simplest pure substances that are made up of only one kind of atom and have definite properties.
physical changes Changes in matter that only change the appearance of the matter.
chemical changes Changes in matter that involve changes in the atomic arrangement.
nuclear changes Changes in matter that involve a change in the number of protons in the nucleus itself.
chemical reaction Occurs when substances are mixed and a chemical change occurs.
compound A substance that contains 2 or more different elements combined as a result of a chemical change.
activation energy The energy required to be put into a chemical reaction in order to get it started.
reactants The materials or substances that react together during a chemical reaction.
products The substances that are formed during a chemical reaction.
catalyst A substance that speeds up the rate of a reaction but does not take part in a chemical reaction.
Created by: susanmason