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

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