Phys or Chem change
counting atoms
conservation of mass
Balancing Chemical Equations
Vocabulary
100
1) Bubbles forming
2) Energy released or absorbed
3) Formation of a new substance
4) Odor
5) difficult or impossible to reverse
What are signs of a chemical change?
100
number of atoms in H2O
What is three
100
The oxidation of iron (aka rust) is represented by the equation:
4Fe + 3O2 --> ????
How many atoms must be on the other side of the equation?
What is 10 atoms?
100
CO2 + H2O → C6H12O6 + O2
5g 10g 8g ?
What is the mass of the product O2?
7g or 7 grams
100
What does the R in the acronym "RAP" stand for?
Reactants
200
Boiling water or melting an ice cube is an example of this.
What is a physical change?
200
number of atoms in glucose, C6H12O6
What is 24?
200
Which of the following equation is impossible?
a) 2H2 + O2 --> 2H2O
b) Na + Cl --> MgCl
c) CaO + CO2 --> CaCO3
What is b?
200
SiCl4 + H2O → H4SiO4 + HCl
12g ? 10g 10g
What is the mass of H2O?
Is H2O a reactant or a product?
What is 8 g or 8 grams?
What is a reactant?
200
This is what we call the ending substances of a chemical reaction. (It is the creation of NEW substances.)
Products
300
This image describes... 
What is water evaporating or a physical change?
300
Number AND type of atoms in 2C8ClF15O
What is 50 total:
- 16 Carbon
- 2 Chlorine
- 30 Fluorine
- 2 Oxygen
300
If you react something on a scale, and the products measure more mass than the reactants, what must be true?
Hint: Think open/closed systems
What is "the system was open"
300
Exothermic or endothermic:
A bundle of sticks reacts with oxygen to create ash, carbon dioxide gas, and water.
What is exothermic, the bundle of sticks burned and released energy to the air around them
300
A chemical equation uses ______________ and ____________ to show how substances interact with each other and transform into new substances during a chemical reaction.
What is numbers and symbols?
400
This image shows...
What is a chemical reaction?
What is something burning/combusting (the products are CO2 and water)?
400
Number and type of atoms in C8H(NO2)7
What is 30?
8 carbon, 1 H, 7N, 14O
400
What is always true about the mass of the products in a chemical reaction?
What is the mass always equal the mass of the reactants.
400
Why is photosynthesis endothermic?
What is glucose has more potential energy stored within its bonds than the carbon dioxide and water that went into it?
400
When you light a candle, physical and chemical changes take place. List one of each.
Wax melting = physical
Wick burning = chemical
500
A student is trying to determine what a clear liquid is. She determines that its density is 0.789 g/cm3 and it is flammable.Which test that she performed took advantage of this liquid's physical properties?
What is density?
500
number of atoms in [Cr(H2O)4Cl2]Cl 2(H2O)
What is 22?
1 Cr, 12 H, 6O, 3Cl
500
Cassidy filled a flask with 5 grams of water, and left it on a scale. A day later the scale read three grams. How could this be true?
What is Cassidy didn't cap/put a lid on the flask
500
What is an example of an exothermic chemical reaction that is happening in every cell of your body right now?
What is cellular respiration?
500
Using elements in the periodic table, create a molecule (chemical formula) that represents a substance that has:
1. 3 different types of elements
2. A coefficient
3. Shows at least 2 of the elements with a subscript
Examples:
2 Na2Cl4O Coefficient is 2, Na=2, Cl=4
4 Fe3O3H Coefficient is 4, Fe=3, O=3
6 C6H12O6 Coefficient is 6, C=6, H=12, o=6