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Atomic Structure And Chemical Reactions
Test Description: Practice
Instructions: Answer all questions to get your test result.
1) A substance containing two or more elements chemically bonded together:
A
Alloy
B
Mixture
C
Atom
D
Compound
2) When a chemical change occurs:
A
The law of conservation of mass is always obeyed
B
Atoms are rearranged
C
The chemical properties of new substances are different from the ones you started with
D
All of the above
3) The principle of conservation of mass is satisfied in a chemical equation when:
A
The same number of each type of atom appears in the reactants and products
B
Each atom on the product side has the same subscript that it had on the reactant side
C
The same number of each type of molecule appears in the reactants and products
D
The sum of the coefficients on the reactant side is the same as the product side
4) What is the coefficient for sodium hydroxide: 2NaOH
A
0
B
2
C
4
D
1
5) Where is the subscript located?
A
Before a compound's formula
B
Below an element symbol
C
After a compound's formula
D
Above an element symbol
6) Where are the reactants located?
A
Right side of the equation
B
The arrow represents reactants
C
Below each element symbol
D
Left side of the equation
7) Where are the products located?
A
The right side of the equation
B
The left side of the equation
C
The arrow represents the products
D
Before each compound's formula
8) What compound is represented as C6H12O6
A
Salt
B
Sand
C
Sugar or glucose
D
Water
9) A reaction is exothermic if forming new bonds:
A
Takes the same amount of energy as was needed to break the old bonds
B
Requires more energy than it tool to break the old bonds
C
Releases more energy than it took to break the old bonds
D
Absorbs energy from the system, causing a temperature drop
10) When you activate an instant cold pack, water mixes with a chemical and the pack gets very cold. This is an example of an:
A
A physical change
B
Exothermic reaction
C
Endothermic reaction
D
Combustion reaction
*select an answer for all questions
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