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.
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


Chapter four

Democritus called nature's basic particle an atom, meaning indivisible. It physically resembled the matter it made (furry atoms)
Aristotle was much more influential and his opinion that matter could be infinitely divided prevailed for almost 2000 years: all matter was made of some combinations of 4 elements (earth, water, fire, air)
Aristotle and Democritus was a only a theory because... there was no scientific testing; only opinions.
Dalton's Atomic Theory John Dalton proposed that the elements were composed of atoms and only whole numbers of atoms can combine and form compounds
Modern Atomic theory was a modification of Dalton's theory. stated that atoms are divisible and an element can have atoms with different masses
Dalton's Theory ideas 1. element are composed of tiny indivisible particles called atoms 2. atoms of the same element are identical. Atoms of different elements are different. no dip.
Dalton's ideas con't 3. different elements can physically mix together or combine. they can combine in whole-number ratio 4. chem. reactions occur when atoms separate, join, rearranged in a different combination
Created by: anegrich14