During a physical change, what happens to the matter?
It does not change
100
Name the 4 type of chemical reactions
Synthesis; Decomposition; Single replacement; and Double replacement
100
What are the electrons in the outermost energy shell called?
Valence electrons
100
Draw the Lewis Dot structure for Li.
Li.
200
What is the weakest universal force?
Gravitational
200
During a chemical change, what happens to the matter?
It's composition changes
200
Tell me which type of chemical reaction is happening...
A + B --> AB
Synthesis
200
Why would atoms want to fill their outer energy level?
To become more stable and behave like a noble gas
200
How do we know there are 7 enerygy shells by just looking at the periodic table?
Because there are 7 periods
300
What is the strongest universal force?
Strong Nuclear
300
Give 2 examples of a chemical change
and 2 examples of a physical change (make sure you label which is which)
Burning wood, cooking etc.- chemical
tearing paper, sawing wood etc. - physical
300
Tell me what type of chemical reaction is happening...
AB + CD --> AC + BD
Double replacement
300
What groups have the most reactive elements? (there are 2)
Group 1 and 7
300
Elements in groups 1, 2, and 3 tend to _______ electrons and become _________.
Lose/ cations
400
Nuclear reactions occur ________ the nucleus and only involve the subatomic particles ____________________________.
Protons and neutrons
400
Sometimes, during a _________ change, a solid that has separated out from a liquid mixture. What change does this occur in and what is the solid that separates from the liquid called.
Chemical; precipitate
400
Tell me what type of chemical reation is happening...
AB --> A + B
Decomposition
400
What type of bond shares electrons?
Covalent
400
Element in groups 5, 6, and 7 tend to _________ electrons and become __________.
Gain/ anion
500
Chemical reactions occur ________ the nucleus and only involve the subatomic particles ________________________.
Electrons
500
There are 3 things we look for to identify a chemical change, what are they? (evidences for a chemical change)
Production of a gas; Change of color; Formation of a precipitate
500
Tell me what type of reaction is happening...
AB + C --> AC + B
Single replacement
500
What is the octet rule?
atoms want to have 8 electrons in their outer shell so it will be full and they will be more stable.
500
The number of elements in each period is equal to the shell's capicity for ____________.