Law of mass /
Balancing
Balancing
Reactions
Review
Density
Mixtures /
changes
changes
100
What does the Law of Conservation of Mass tell you? During a Chemical reaction Matter can’t be _____________or _________________
created or destroyed
100
What do you call the substances that react with each other in a chemical reaction?
Reactants
100
Atomic mass is calculated by
_____________________________________
Adding protons and neutrons.
100
When Marissa blows up a balloon what happens to the gas inside?
The air particles are spread out and fill up all of the space
100
3 ways to recognize a physical change
change in state of matter
no new substances created
easily reversed
200
Which of the pictures below illustrates that the law of Conservation says the products and reactants must be the same? Circle the correct answer.
the top one
200
What do you call the substance that comes out of a chemical reaction?
Product
200
The outside layer of electrons are called ___________
_________________________
Valence Electrons
200
Describe in detail what happens when you add heat to a solid.
The molecules/atoms start moving faster, spread out, and turn into a liquid (melt)
200
3 ways to recognize a chemical change
color change.
A new product was created.
light, sound, heat, or precipitate created.
not easily reversible.
300
is this equation balanced
show your work
Reactants - Iron - 3 Hydrogen 4 Oxygen 2
Products - Iron - 3 Hydrogen - 4 Oxygen -4
300
What are the reactants?
300
What type of elements are malleable, ductile, and brittle?
Metals
300
Define density
Density is a property of a substance that describes the relationship between the mass and volume of a substance. it is expressed as grams per ML, or grams per cm3
300
What happens when you mix vinegar and baking soda?
and how do you know?
Chemical reaction - a gas (CO2) is Created.
400
How many total atoms?
72
400
.What are the reactants
6CO2 - Carbon dioxide
6H2O - Water
400
When 2 atoms of the same element bonded together it's called ____________
Diatomic
400
If you had heat to a solid it turns to a _________and if you add heat you get a _______
liquid, gas
400
In a cup, you mix water and salt. What is the water? Solvent or Solute?
Solvent.
500
In a chemical reaction, the Mass of the Reactants is equal to __________________________________________________.
The mass of the products.
500
Balanced or not - Show your work 
No
C - 1 C - 1
H - 2 H - 2
O - 4 O - 3
500
What are these called
Erlenmeyer flask
500
How does popcorn pop?
( use google )
As the kernel heats up, the water expands, building pressure against the hard starch surface. Eventually, this outer layer gives way, causing the popcorn to explode. As it explodes, the soft starch inside the popcorn becomes inflated and bursts, turning the kernel inside out.
500
In a cup, you mix water and salt. what is the salt? Solvent or Solute?
Solute.
600
Balanced or not - Show your work.
Nope 
600
What are the products?
600
What lab tool do you use to measure mass?
Ballance.
600
What do each of the variables mean?
D - Density
M - Mass
V - Volume
600
What 2 things can cause a change in state of matter?
changes in heat or pressure