Phys or Chem change
counting atoms
conservation of mass
exothermic and endothermic
miscellaneous
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
Endothermic reactions feel this way because they have absorbed energy
What is cold?
100
The full *word* chemical equation for photosynthesis
What is carbon dioxide + water + sunlight energy --> oxygen and glucose?
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
Exothermic reactions feel this way because they have released energy
What is hot?
200
the full word equation for cellular respiration
What is glucose and oxygen create energy, carbon dioxide, and water?
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
If something is burning, _____ is a reactant.
What is oxygen?
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, 8 H, 4O, 9Cl
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
Trees build their bodies from cellulose (C6H10O5). Using what you know about photosynthesis and cellular respiration, describe where you think trees get this carbon from to make the cellulose?
All the atoms that trees use to build their bodies comes from photosynthesis.