Clicker Questions

Clicker #1

To balance a chemical equation, it may be necessary to adjust the

A. coefficients.

B. subscripts.

C. formulas of the products.

D. number of products.

Clicker #2

Prefixes are used in what kind of compounds?

A. metallic.

B. ionic.

C. covalent.

D. acidic.

Clicker #3

What would be the correct formula for aluminum sulfate?

A. AlSO4

B. Al2SO4 3

C. Al3(SO4)2

D. Al2(SO4)3

Clicker #4

What would be the correct name for Al2S3?

A. Aluminum SulfideB. Aluminum (III) SulfideC. Diboron TrisulfideD. None of the above

Clicker #5

What is the formula mass for iron (III) hydroxide?

A. 73 amuB. 90 amuC. 107 amuD. 142 amu

Clicker #6

Which coefficients correctly balance the formula equation CaCO3(s) → CaO(s) + CO2(g)?

A. 1, 1, 1B. 1, 3, 1C. 2, 6, 3D. 3, 1, 2

Clicker #7

Which coefficients correctly balance the formula equation NH4NO2 → N2 + H2O?

A. 1, 2, 2B. 1, 1, 2C. 2, 1, 1D. 2, 2, 2

Clicker #8

Lead (III) chloride reacts with calcium hydroxide to form calcium chloride and lead (III) hydroxide. What are the coefficients for this reaction?

A. 3, 2, 2, 3B. 2, 3, 2,2C. 2, 3, 3, 2D. None of these

Clicker #9

What is the percent by mass of carbon in acetone, C3H6 O?

A.20.7%B.1.61%C.30.0%D.62.1%

Clicker #10

The lowest whole-number ratio of the elements in a compound is called the ____.

A.binary formulaB.molecular formulaC.empirical formulaD.representative formula

Clicker #11

What would be the best name for Cr(OH)3?

A.Mono Chromium trioxide trihydrideB.Chromium (III) hydroxideC.Chromium Trioxide TrihydrideD.Chromium Hydroxide

Clicker #12

Chemical equations must be balanced to satisfy ____.

A.the law of definite proportionsB.the law of multiple proportionsC.the law of conservation of massD.Avogadro’s principle

Clicker #13

Which of the following could be an empirical formula?

A.N2O5

B.N2O4

C.N2H6

D.More than one could be an empirical formula

Clicker #14

If a compound has an empirical formula of COH2, has a molecular weight equal to 60. g/mol, what is the molecular formula?

A.C3O1H6

B. C2O2H4

C.C1O2H16

D.C3O3H6

Clicker #15

What is the formula for tetraphosphorus hexoxide?

A.4P7O

B.P4O6

C.P3O7

D.P4O7

Clicker #16

What is the formula for magnesium iodide?

A.MgIB.MgI2

C.Mg2I

D.Mg2I2

Clicker #17

What would be the best name for K3PO4?

A.Potassium PhosphateB.Potassium (I) PhosphateC.Tripotassium PhosphateD.Potassium Phosphide Oxide

Clicker #18

In every balanced chemical equation, each side of the equation has the same number of ____.

A.coefficientsB.molesC.moleculesD.atoms of each element

Clicker #19

Which coefficients correctly balance the formula equation

Zn(OH)2 + CH3COOH → Zn(CH3COO)2 + H2O?

A.1, 2, 1, 1B.2, 1, 2, 1C.1, 2, 1, 2D.2, 1, 1, 2

Clicker #20

What is the balanced equation when aluminum reacts with copper(II) sulfate to produce aluminum sulfate and copper?

A.Al + Cu2S →Al2S + Cu

B.2Al + 3CuSO4 → Al2(SO4)3 + 3Cu

C.Al + CuSO4 → AlSO4 + Cu

D.2Al + Cu2SO4 → Al2SO4 + 2Cu

Clicker #21

The percent composition of aluminum in aluminum hydroxide is:

A.50%B.25%C.14%D.None of the answers are correct

Clicker #22

N2S3 is properly named:

A.nitrogen sulfide B.nitrogen (III) sulfide C.nitrogen (II) sulfide D.None of the answers are correct

Clicker #23 The red numbers in the image below represent

________

A.subscriptsB.CoefficientsC.I don’t know, and don’t want to tryD.None of the answers are correct

Clicker #24 The blue numbers in the image below represent

________

A.I don’t know, and don’t want to tryB.CoefficientsC.SubscriptsD.None of the answers are correct

Clicker #25In a reaction in which hydrogen reacts with oxygen

to produce water, which substances are the reactants?

A.hydrogen only B.oxygen only C.waterD.both hydrogen and oxygen

Clicker #2611. How many atoms of oxygen are represented in

2Ca(NO3)2?

A.4 B.6 C.10 D.12