Chemical Reactions - Assessment

1.

Multiple Choice

1 min

1 pt

Which of the following is NOT a chemical property?

state of matter

photosensitivity

combustability

flammability

2.

Multiple Choice

1 min

1 pt

_______ 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

1 min

1 pt

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

1 min

1 pt

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

1 min

1 pt

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

1 min

1 pt

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

1 min

1 pt

How many reactants are shown in the following chemical equation?

2H₃PO₄ + 3CaCO₃ --> Ca₃(PO₄)₂ + 3H₂O + 3CO₂

3

7

2

5

8.

Multiple Choice

1 min

1 pt

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

1 min

1 pt

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

1 min

1 pt

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

1 min

1 pt

In a chemical reaction, the _______ is used up first, usually because it is expensive.

precipitate

catalyst

limiting reactant

excess reactant

12.

Multiple Choice

1 min

1 pt

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

1 min

1 pt

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

1 min

1 pt

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

1 min

1 pt

Evidence of an endothermic reaction is that it:

gets hot

gets cold

gives off sounds

gives off light

16.

Multiple Choice

1 min

1 pt

Cu(OH)2 --> CuO + H2O

decomposition

synthesis

single replacement

double replacement

17.

Multiple Choice

1 min

1 pt

Al + CuSO4 --> Al2(SO4)3 + Cu

single replacement

decomposition

synthesis

double replacement

18.

Multiple Choice

1 min

1 pt

N2 + H2 --> NH3

synthesis

single replacement

double replacement

combustion

19.

Multiple Choice

1 min

1 pt

C3H8 + O2 --> CO2 + H2O

single replacement

combustion

double replacement

synthesis

20.

Multiple Choice

30 sec

1 pt

Cellular Respiration in your "mighty"chondria is a physical or chemical change?

physical change

chemical change

21.

Multiple Choice

30 sec

1 pt

Digesting your breakfast is a physical or chemical change?

physical change

chemical change

22.

Multiple Choice

30 sec

1 pt

Tarnishing silver is a physical or chemical change?

physical change

chemical change

23.

Multiple Choice

30 sec

1 pt

Dissolving something a physical or chemical change?

physical change

chemical change

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