Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

Username is available taken
show password


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.

Remove ads
Don't know
remaining cards
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:
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

Chemistry Unit Rev.

Stack #113625

Science TermsDefinition
John Dalton Atoms were spherical in shape
Ernest Rutherford atoms were mostly space
Democritus First person to define an atom
Neils Bohr Atom has a nucleus with electrons orbitting it
Protons postively charged particle in nucleus
Neutrons neutral charge, in nucleus
Electron negatively charged particle, orbits nucleus
Isotope atom with more or less neutrons than normal
Ion an atom with a postive or negative charge
Charge When an atom is positive or negative due to loss or gain of electrons
# of protons equals atomic number
# of neutrons equals atomic mass - atomic number
# of electrons equals number of protons
valence electrons electrons in outermost shell
Valence shell outer shell where bonding takes place
diatomic molecule when 2 atoms of the same atom combine
physical change change that affects size, shape, or state of matter
chemical change creates a new substancen
Acid substance that produces positive hydrogen H+ ions
Base negative ions (usually OH-) in a solution
Neutral Substance Produces Salt and water, pH of 7
Created by: loddengaardj