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- 1. Multiple Choice
Which of the following is NOT a chemical property?
state of matter
photosensitivity
combustability
flammability
- 2. Multiple Choice
_______ is a characteristic of a material that can be observed without actually changing the identity of the substance.
a chemical property
a physical property
Activation Energy
decomposition
- 3. Multiple Choice
Which of the following would NOT necessarily be considered evidence of a chemical change?
one or more substances change state (liquid to gas, etc)
a mixture bubbles and foams without a heat source
a mixture forms a precipitate
a mixture becomes hot without a heat source
- 4. Multiple Choice
According to _______, matter is neither destroyed nor created during a chemical reaction. This is why we have to balance equations.
the Law of Conservation of Mass
Newton’s Law
the Law of Chemical Reactions
the Law of Conservation of Energy
- 5. Multiple Choice
In a chemical reaction, (aq) written after a compound means that:
the compound is flammable.
the compound is dissolved in water.
the compound will melt.
the compound is unstable.
- 6. Multiple Choice
The smallest amount of energy needed for a chemical reaction to begin is called its _______.
activation energy
excess reactant
endothermicity
limiting reactant
- 7. Multiple Choice
How many reactants are shown in the following chemical equation?
2H3PO4 + 3CaCO3 --> Ca3(PO4)2 + 3H2O + 3CO2
3
7
2
5
- 8. Multiple Choice
Changing the subscript in a chemical formula changes _______.
nothing
the identify of the substance so that it becomes a different compound
the electrical charge on the atoms of that substance
the amount of that substance
- 9. Multiple Choice
What CAN a chemical equation tell you?
The conditions necessary, such as sunlight.
The ratio of the substances involved in the reaction.
If the reaction will occur.
How fast the reaction will occur.
- 10. Multiple Choice
A solid compound that forms and settles out of a solution during a double displacement reaction is called _______.
an aqueduct
a catalyst
a precipitate
a reactant
- 11. Multiple Choice
In a chemical reaction, the _______ is used up first, usually because it is expensive.
precipitate
catalyst
limiting reactant
excess reactant
- 12. Multiple Choice
During a _______ reaction, the first element in two different compounds swap places to form two completely new compounds.
synthesis
decomposition
double displacement
single displacement
- 13. Multiple Choice
Which of the following is an example of an exothermic reaction?
all of the examples given are correct
fireworks
campfires
glow sticks
- 14. Multiple Choice
Substances that are used to help speed up a reaction (without actually becoming a part of it) are called _______.
limiting reactants
inhibitors
precipitates
catalysts
- 15. Multiple Choice
Evidence of an endothermic reaction is that it:
gets hot
gets cold
gives off sounds
gives off light
- 16. Multiple Choice
Cu(OH)2 --> CuO + H2O
decomposition
synthesis
single replacement
double replacement
- 17. Multiple Choice
Al + CuSO4 --> Al2(SO4)3 + Cu
single replacement
decomposition
synthesis
double replacement
- 18. Multiple Choice
N2 + H2 --> NH3
synthesis
single replacement
double replacement
combustion
- 19. Multiple Choice
C3H8 + O2 --> CO2 + H2O
single replacement
combustion
double replacement
synthesis
- 20. Multiple Choice
Cellular Respiration in your "mighty"chondria is a physical or chemical change?
physical change
chemical change
- 21. Multiple Choice
Digesting your breakfast is a physical or chemical change?
physical change
chemical change
- 22. Multiple Choice
Tarnishing silver is a physical or chemical change?
physical change
chemical change
- 23. Multiple Choice
Dissolving something a physical or chemical change?
physical change
chemical change
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