Q: A beaker contains 0.056 kg of water. If an oxygen atom has a mass of $$2.66 \times 10$$^{-26}$$ g, how many moles of oxygen atoms have a mass equal to the water in the beaker?

$$2.11 \times 10$$^{22}$$ moles

Q: Convert $$8.45 \text{ kg}^3 / \text{m}^2 to$$ $$\text{g}^3 / \text{cm}^2.$$

$$8.45 \times 10$$^{12}$$ \text{ g}^3 / \text{cm}^2$$

Q: If $$1 \text{ m} = 2.54 \text{ cm}$$ and $$1 \text{ mi} = 1.609 \text{ km}$$, how many centimeters are in $$2.5$$ miles?

$$4.02 \times 10$$^{5}$$ \text{ cm}$$

Q: Which of the following is the correct formula for calculating density?

$$\text{Density} = \dfrac{\text{mass}}{\text{volume}}$$

Question 1

A beaker contains 0.056 kg of water. If an oxygen atom has a mass of $$2.66 	imes 10$$^{-26}$$ g, how many moles of oxygen atoms have a mass equal to the water in the beaker?

Accepted Answer

$$2.11 	imes 10$$^{22}$$ moles

Question 2

Convert $$8.45 	ext{ kg}^3 / 	ext{m}^2 to$$ $$	ext{g}^3 / 	ext{cm}^2.$$

Accepted Answer

$$8.45 	imes 10$$^{12}$$ 	ext{ g}^3 / 	ext{cm}^2$$

Question 3

You want to fill a square cup all the way to the top with water. How many milliliters of water will you need if the cup has the dimensions $$1.2 	ext{ in} 	imes 1.3 	ext{ in} 	imes 2.1 	ext{ in}$$?

Accepted Answer

$$53.8 	ext{ mL}$$

Question 4

A chemist measures the volume of an unknown liquid as $$0.583 L $$and its mass as $$900 g. $$What is the density of the liquid in $$	ext{g}/	ext{cm}^3$$?

Accepted Answer

$$1.54 	ext{ g}/	ext{cm}^3$$

Question 5

Given the density table below, which liquid is most likely to be the unknown sample with a density of $$1.54 	ext{ g}/	ext{cm}^3$$?

Densities:
- diethylamine: $$0.71 	ext{ g}/	ext{cm}^3
- $$glycerol: $$1.26 	ext{ g}/	ext{cm}^3
- $$ethanolamine: $$1.02 	ext{ g}/	ext{cm}^3
- $$carbon tetrachloride: $$1.59 	ext{ g}/	ext{cm}^3
- $$octane: $$0.70 	ext{ g}/	ext{cm}^3$$

Accepted Answer

carbon tetrachloride

Question 6

A chemistry student needs $$6.6 g of $$pentane for an experiment. The density of pentane is $$0.626 	ext{ g}/	ext{cm}^3. $$What volume of pentane should the student measure out?

Accepted Answer

$$10.5 	ext{ mL}$$

Question 7

If $$1 	ext{ m} = 2.54 	ext{ cm}$$ and $$1 	ext{ mi} = 1.609 	ext{ km}$$, how many centimeters are in $$2.5$$ miles?

Accepted Answer

$$4.02 	imes 10$$^{5}$$ 	ext{ cm}$$

Question 8

Which of the following best describes the process of identifying an unknown liquid using density measurements?

Accepted Answer

Compare the measured density to known values from a reference table.

Question 9

A student measures the mass of a liquid as $$250 g $$and its volume as $$200 mL. $$What is the density of the liquid in $$	ext{g}/	ext{cm}^3$$?

Accepted Answer

$$1.25 	ext{ g}/	ext{cm}^3$$

Question 10

Which of the following is the correct formula for calculating density?

Accepted Answer

$$	ext{Density} = \dfrac{	ext{mass}}{	ext{volume}}$$

Question 11

A chemist has a sample of carbon tetrachloride with a mass of $$50 g. $$What is the volume of the sample if the density is $$1.59 	ext{ g}/	ext{cm}^3$$?

Accepted Answer

$$31.4 	ext{ cm}^3$$

Question 12

If a student incorrectly uses $$1 	ext{ m} = 100 	ext{ cm}$$ instead of $$1 	ext{ m} = 2.54 	ext{ cm} in a $$calculation, what is the likely result?

Accepted Answer

The answer will be much larger than the correct value.

Question 13

A student needs to convert $$5.0 L of $$water to cubic centimeters. What is the correct conversion?

Accepted Answer

$$5000 	ext{ cm}^3$$

Question 14

Which of the following is the correct value for Avogadro's number?

Accepted Answer

$$6.022 	imes 10$$^{23}$$

Question 15

A student is asked to measure $$1.2 L of $$ethanolamine. If the density is $$1.02 	ext{ g}/	ext{cm}^3$$, what is the mass of ethanolamine in grams?

Accepted Answer

$$1224 	ext{ g}$$

Question 16

Which of the following is NOT a correct unit for density?

Accepted Answer

$$	ext{cm}/	ext{g}^3$$

Question 17

A sample of octane has a mass of $$35 g $$and a density of $$0.70 	ext{ g}/	ext{cm}^3. $$What is the volume of the sample?

Accepted Answer

$$50 	ext{ cm}^3$$

Question 18

A student wants to convert $$2.0 kg to $$grams. What is the correct answer?

Accepted Answer

$$2000 	ext{ g}$$

Question 19

Which of the following statements about significant figures is correct?

Accepted Answer

Zeros between nonzero digits are always significant.

General Chemistry Study Notes: Units, Density, and Dimensional Analysis

Study Guide - Practice Questions

Study Guide - Flashcards