Save
Busy. Please wait.
Log in with Clever
or
show password
Forgot Password?
Don't have an account?  Sign up 
Sign up using Clever
or
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. Your email address is only used to allow you to reset your password. See 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.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't Know
Remaining cards (0)
Know
0:00
edit
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

Science Unit 2

TermDefinition
Valence Electrons an electron is one of outer shells of an atom that can participate in forming chemical bonds with other atoms
Periodic Table arranges all known elements from left to right by mass.
Properties of Metals solid at room temperature shiny luster malleable good conductors of electricity higher density+melting point metals at bottom left are most reactive
Properties of Non-metals no luster poor conductors lower melting points not malleable less reactive brittle lower density
Metalloids elements on both sides of the zig-zag line have properties of both metals and non-metals
Periods rows 1-7 on left side atomic number increases left to right same number of energy levels chemical properties are not the same.
Groups numbered 1-18 all have the same number of valence electrons Group 1 is most reactive; group 18 is most stable
Reactivity the ability of atoms to combine or separate with other atoms to create new substances.
"Happy" atoms when an atoms has 8 electrons on the outer energy level and/or has a complete set
Covalent Bond a bond formed by atoms sharing electrons.
Polar Covalent Bonds a covalent bond in which the two atoms have different electronegativities causing a separation in charges.
Non-polar Covalent Bonds a covalent bond in which two atoms have identical or very similar electronegativities so the charges are distributed evenly.
Polarity seperation of charges
Chemical Bonds attractions between either atoms or molecules.
Electronegativity the ability of an atom to attract shared electrons; how much you want electrons.
Ionic Bond a bond formed by the transfer of electrons from one atom to another.
Bond length the distance between two nuclei at the point of minimum energy; where attractive and repulsive cancel out
Combustion when oxygen combines with a substance and releases energy in the form of heat and light
Synthesis when two or more reactants combine to produce a single product.
Decomposition a single compound breaks down into two or more elements or new compounds.
Single replacement when one element replaces with another element in a compound.
double replacement when the cations and antions of two compounds switch places, forming two entirely new different compounds.
Created by: kannon12
Popular Physical Science sets

 

 



Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
"Know" box contains:
Time elapsed:
Retries:
restart all cards