Quiz about Chemistry CIA 2 Review A

Question 1

What is the correct coefficient for Fe in:
Fe + H2O----->Fe3O4 + H2?

Accepted Answer

3

Answer

4

Answer

2

Answer

1

Question 2

Which is NOT a sign of a chemical reaction?

Accepted Answer

Phase change

Answer

Temperature change

Answer

Color change

Answer

Gas formation

Question 3

How many atoms of hydrogen are in 3H2(SO4)?

Accepted Answer

6

Answer

3

Answer

4

Answer

12

Question 4

Which of the following represents a balanced chemical equation?

Accepted Answer

2H2 + O2 --->2H2O

Answer

H2 + O2 --->2H2O

Answer

2H2 + O2 --->H2O

Answer

2H2 + 2O2 --->2H2O

Question 5

What mass of NaCl contains 3 moles?

Accepted Answer

175.3 g

Answer

117 g

Answer

58.5 g

Answer

152.5 g

Question 6

A compound is composed of 70% iron and 30% oxygen by mass. What is its empirical formula?

Accepted Answer

Fe2O3

Answer

FeO

Answer

FeO2

Answer

Fe3O4

Question 7

If the empirical formula of a compound is NH2 and its molecular mass is 32 g/mol, what is the molecular formula?

Accepted Answer

N2H4

Answer

N3H6

Answer

NH3

Answer

NH2

Question 8

A compound has an empirical formula of C2H5 and a molecular mass of 58 g/mol. What is its molecular formula?

Accepted Answer

C4H10

Answer

C3H8

Answer

C5H12

Answer

C2H5

Question 9

How do you know a chemical reaction has taken place?

Accepted Answer

Observable changes such as color change, gas production, or temperature change.

Answer

Chemical equations require a catalyst to occur.

Answer

Chemical equations can only be identified by smell.

Answer

Chemical equations are always balanced.

Question 10

Why might a chemical reaction cause a loss of mass?

Accepted Answer

A chemical reaction can cause a loss of mass due to the release of gases.

Answer

A chemical reaction can cause a loss of mass if it does not obey the Law of Conservation

Answer

Chemical reactions always gain mass due to energy release.

Answer

Loss of mass is only due to temperature changes during a reaction.

Question 11

The activity series of metals is:

Accepted Answer

The activity series of metals ranks metals from most reactive to least reactive.

Answer

The activity series of metals ranks metals by their density.

Answer

The activity series of metals is a chart of metals based on their color.

Answer

The activity series of metals lists metals by their atomic mass.

Question 12

Formula mass is:

Accepted Answer

the sum of the atomic masses of all atoms in a chemical formula

(molar mass)

Answer

the volume of a chemical compound

Answer

the density of a substance

Answer

the weight of a single atom

Question 13

What is a binary compound?

Accepted Answer

A binary compound is a chemical compound made up of two different elements.

Answer

A binary compound consists of three or more elements.

Answer

A binary compound is a mixture of two gases.

Answer

A binary compound is a type of organic compound.

Question 14

What is IUPAC nomenclature?

Accepted Answer

IUPAC nomenclature is the standardized system for naming chemical compounds.

Answer

A method for measuring chemical reactions.

Answer

A technique for synthesizing organic compounds.

Answer

A classification system for chemical elements.

Question 15

What is the name for FeO

Accepted Answer

Iron (II) oxide

Answer

Iron oxide

Answer

Iron (I) oxide

Answer

Iron (III) oxide

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