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

$0.00845 \text{ g} / \text{cm}^3$

Q: Which of the following is the correct conversion factor to change kilometers to centimeters?

$1 \text{ km} = 10^5 \text{ cm}$

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

$\text{Density} = \frac{\text{Mass}}{\text{Volume}}$

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

$2.11 	imes 10^{27}$ moles

Question 2

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

Accepted Answer

$0.00845 	ext{ g} / 	ext{cm}^3$

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

$67.8 	ext{ mL}$

Question 4

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

Accepted Answer

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

Question 5

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

Accepted Answer

$10.5 	ext{ cm}^3$

Question 6

Which of the following is the correct conversion factor to change kilometers to centimeters?

Accepted Answer

$1 	ext{ km} = 10^5 	ext{ cm}$

Question 7

If a chemist identifies an unknown liquid with a density of $1.26 	ext{ g} / 	ext{cm}^3$, which of the following substances is it most likely to be?

Accepted Answer

carbon tetrachloride

Question 8

A student measures the mass of a sample as $0.056 	ext{ kg}$. How many grams is this?

Accepted Answer

$56 	ext{ g}$

Question 9

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

Accepted Answer

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

Question 10

A student needs to convert $2.54 	ext{ cm}$ to inches. What is the correct value?

Accepted Answer

$1 	ext{ in}$

Question 11

If the density of ethanol is $0.789 	ext{ g} / 	ext{cm}^3$, what is the mass of $250 	ext{ mL}$ of ethanol?

Accepted Answer

$197.25 	ext{ g}$

Question 12

A chemist has $1.609 	ext{ km}$ of wire. How many meters of wire does the chemist have?

Accepted Answer

$1609 	ext{ m}$

Question 13

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

Accepted Answer

$6.022 	imes 10^{23}$

Question 14

A student wants to convert $1.2 	ext{ in}$ to centimeters. What is the correct value?

Accepted Answer

$3.05 	ext{ cm}$

Question 15

If a liquid has a density of $1.6 	ext{ g} / 	ext{cm}^3$ and a volume of $250 	ext{ mL}$, what is its mass?

Accepted Answer

$400 	ext{ g}$

Question 16

A sample contains $2.66 	imes 10^{-26}$ g per atom. How many atoms are in $1 	ext{ g}$ of the sample?

Accepted Answer

$3.76 	imes 10^{25}$ atoms

Question 17

Which of the following is the correct formula for density?

Accepted Answer

$	ext{Density} = \frac{	ext{Mass}}{	ext{Volume}}$

Question 18

A student has $0.583 	ext{ L}$ of a liquid. How many $	ext{cm}^3$ is this?

Accepted Answer

$583 	ext{ cm}^3$

Question 19

If a student needs $250 	ext{ mL}$ of water, how many liters is this?

Accepted Answer

$0.25 	ext{ L}$

General Chemistry Study Notes: Units, Density, and Moles

Study Guide - Practice Questions

Study Guide - Flashcards