Chem exam review 150+ (Latest Edition) 100% Verified Q&A + Answer Key Solutions

Chem exam review
(Latest 2025-2026 Edition) 100% Verified Q&A + Answer
150+
Key Solutions


VERIFIED ANSWERS


Question 1
The measurement 0.0000043m, expressed correctly using scientifc notation, is __________.
Correct Answer
4.3 x 10^-6 m


Question 2
which of the following numbers contains the designated CORRECT number of significant figures?
A) 0.04300 = 5 significant figures
B) 0.00302 = 2 significant figures
C) 156,000 = 3 significant figures
D) 1.04 = 2 significant figures
E) 3.0650 = 4 significant figures

Correct Answer
C) 156,000 = 3 significant figures


Question 3
Which one of the following substances will float in gasoline, which has a density of 0.66 g/mL?
A) table salt (density = 2.16 g/mL)
B) balsa wood (density = 0.16 g/mL)
C) sugar (density = 1.59 g/mL)
D) aluminum (density = 2.70 g/mL)
E) mercury (density = 13.6 g/mL)

Correct Answer
B) balsa wood (less dense)


Question 4
what type of measurement uses milliliter as a unit?
Correct Answer
volume




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,Question 5
what type of measurement uses mm as a unit?
Correct Answer
distance


Question 6
what type of measurement uses gram as a unit?
Correct Answer
mass


Question 7
what type of measurement uses 125 K as a unit?
Correct Answer
temperature


Question 8
what type of measurement uses kilometer as a unit?

Correct Answer
distance


Question 9
what type of measurement uses milligram as a unit?
Correct Answer
mass


Question 10
When a solid is converted directly to a gas, the change of state is called _________
Correct Answer
sublimation (ex: dry ice)


Question 11
When a liquid is converted directly to a solid, the change of state is called _________
Correct Answer
freezing


Question 12
When a solid is converted directly to a liquid, the change of state is called _________
Correct Answer
melting




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, Question 13
When a liquid is converted directly to a gas, the change of state is called _________
Correct Answer
boiling


Question 14
When a gas is converted directly to a liquid, the change of state is called _________
Correct Answer
condensation


Question 15
In a gas, the distance between the particles is __________.
Correct Answer
very large relative to the size of the molecules


Question 16
what is multiple elements chemically combined in a specific ratio?
Correct Answer
compound


Question 17
what type of mixture allows you to see different parts?
Correct Answer
heterogeneous mixtures


Question 18
what type of mixture does not allow you to see different parts?
Correct Answer
homogeneous mixture


Question 19
Helium is a(n)
A) compound.
B) heterogeneous mixture.
C) element.
D) homogeneous mixture.
E) electron.
Correct Answer
C) element




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