Question 1

Which law states that all samples of a given compound have the same proportions of their constituent elements?

Accepted Answer

Law of Constant Composition

Question 2

What is the correct name for the compound Ca(NO\_3)\_2?

Accepted Answer

Calcium Nitrate

Question 3

Which formula represents the greatest total number of atoms?

Accepted Answer

Al(C\_2H\_3O\_2)\_3

Question 4

Which of the following is a molecular element?

Accepted Answer

Oxygen Molecule

Question 5

Which substance is a molecular compound?

Accepted Answer

Carbon Dioxide

Question 6

Which substance is an ionic compound?

Accepted Answer

Sodium chloride

Question 7

What is the correct formula for strontium bromide?

Accepted Answer

SrBr\_2

Question 8

Name the ionic compound Zn\_3N\_2.

Accepted Answer

Zinc Nitride

Question 9

Which formula is Potassium Nitrite?

Accepted Answer

KNO\_2

Question 10

Calculate the molar mass of H\_2O. Use the atomic masses: H = 1.01 g/mol, O = 16.00 g/mol.

Accepted Answer

$$18.02\ \mathrm{g/mol}$$

Question 11

Which of the following is evidence that a chemical reaction has occurred?

Accepted Answer

All of the Above

Question 12

Which compound is soluble in water?

Accepted Answer

KOH

Question 13

Which of the following is a weak acid?

Accepted Answer

HF

Question 14

Which of the following is a strong base?

Accepted Answer

NaOH

Question 15

Professor Giggles finds 50.0 g of isopropyl alcohol (C\_3H\_8O). What is the number of moles present? (Molar mass = 60.10 g/mol)

Accepted Answer

$$0.832\ \mathrm{mol}$$

Question 16

How many molecules of isopropyl alcohol are in 50.0 g? (Moles calculated as $$0.832\ \mathrm{mol}$$, Avogadro's number $$= 6.022 	imes 10$$^{23}$$)

Accepted Answer

$$5.01 	imes 10$$^{23}$$

Question 17

Write the net ionic equation for the reaction between sodium hydroxide and hydrochloric acid.

Accepted Answer

$$\mathrm{OH^-} + \mathrm{H^+} \rightarrow \mathrm{H_2O}$$

Question 18

A bile sample has a total mass of 200.0 g and contains 10.5 g of sulfur-rich compounds. What is the percentage of sulfur-rich compounds in the sample?

Accepted Answer

$$5.25\%$$

Question 19

A witch's potion contains 40.00% C, 6.71% H, and 53.29% O by mass. What is the empirical formula of the compound?

Accepted Answer

C\_2H\_4O

Question 20

Based on the empirical formula C\_2H\_4O and a molar mass of 180.18 g/mol, what is the molecular formula of the compound?

Accepted Answer

C\_6H\_12O\_6

Chemistry 101: Introduction to Chemistry – Study Guide and Practice Exam Notes

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