Q: Which of the following is the correct formula for specific gravity?

$\text{Specific gravity} = \frac{\text{density of sample}}{\text{density of water}}$

Q: Which of the following is the correct formula for calculating percent by mass?

$\text{Percent} = \frac{\text{part}}{\text{whole}} \times 100$

Question 1

A solution contains 24% HCl by mass. If you have 15.5 grams of this solution, how many grams of HCl are present?

Accepted Answer

$3.72 	ext{ g}$

Question 2

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture in which the composition is uniform throughout

Question 3

What is the percent by mass of carbon in carbon dioxide ($CO_2$) if the mass of carbon is $12 	ext{ g}$ and the mass of oxygen is $32 	ext{ g}$?

Accepted Answer

$27\%$

Question 4

A salt and water solution is $33.0\%$ salt by mass. If the solution contains $7.50 	ext{ g}$ of salt, what is the total mass of the solution?

Accepted Answer

$22.7 	ext{ g}$

Question 5

Which of the following statements about density is correct?

Accepted Answer

Density is a ratio of mass to volume and is constant for a substance at a given temperature.

Question 6

A brick of 14-karat gold has a mass of $1100 	ext{ g}$ and a volume of $85 	ext{ mL}$. What is its density?

Accepted Answer

$12.9 	ext{ g/mL}$

Question 7

Which of the following is the correct formula for specific gravity?

Accepted Answer

$	ext{Specific gravity} = \frac{	ext{density of sample}}{	ext{density of water}}$

Question 8

A patient is prescribed $7.5 	ext{ mg}$ of acetaminophen per kg of body weight. If the patient weighs $42 	ext{ kg}$, how many milligrams should be given in a dose?

Accepted Answer

$315 	ext{ mg}$

Question 9

Which of the following is NOT a physical property of matter?

Accepted Answer

Ability to react with acid

Question 10

Convert $220$ nutritional Calories (Cal) to joules. ($1 	ext{ Cal} = 4184 	ext{ J}$)

Accepted Answer

$920,480 	ext{ J}$

Question 11

Which temperature conversion formula is correct for converting Celsius to Kelvin?

Accepted Answer

$K = ^\circ C + 273$

Question 12

A liquid has a density of $0.85 	ext{ g/mL}$. Will a $10 	ext{ mL}$ sample of this liquid float or sink in water?

Accepted Answer

It will float because its density is less than water.

Question 13

Which of the following best describes a compound?

Accepted Answer

A pure substance made of two or more elements chemically combined in a fixed ratio

Question 14

Which of the following is the correct formula for calculating percent by mass?

Accepted Answer

$	ext{Percent} = \frac{	ext{part}}{	ext{whole}} 	imes 100$

Question 15

Which of the following statements about the states of matter is true?

Accepted Answer

Liquids have a definite volume but take the shape of their container.

Question 16

A $5.00 	ext{ mL}$ sample of a substance has a mass of $6.45 	ext{ g}$. What is its density?

Accepted Answer

$1.29 	ext{ g/mL}$

Question 17

Which of the following is a correct statement about energy?

Accepted Answer

Energy cannot be created or destroyed, only transformed.

Question 18

Which of the following is the SI unit for energy?

Accepted Answer

Joule ($J$)

Question 19

A patient receives a prescription for $10 	ext{ mg/kg}$ of pain medicine. If the patient weighs $75 	ext{ kg}$, how many milligrams should be administered?

Accepted Answer

$750 	ext{ mg}$

Chapter 1: Measuring Matter – Foundations of GOB Chemistry

Study Guide - Practice Questions

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