Q: A graduated cylinder contains water at the 17.2 mL mark. If you add 2.8 mL of another liquid, what is the total volume, and how many significant figures should your answer have?

$$20.0\ \text{mL}$$, 3 significant figures

Q: What is the correct conversion factor to convert inches to centimeters?

$$1\ \text{in} = 2.54\ \text{cm}$$

Q: Which of the following is the correct formula for calculating heat energy required to raise the temperature of a substance?

$$\text{Heat} = \text{SH} \times \text{mass} \times \Delta T$$

Question 1

Which of the following is an example of a chemical change?

Accepted Answer

Burning wood in a campfire

Question 2

A sample of matter is uniform throughout and cannot be separated into simpler substances by physical means. Which classification best describes this sample?

Accepted Answer

Pure substance

Question 3

Which of the following statements about physical properties is TRUE?

Accepted Answer

Physical properties include color, melting point, and density.

Question 4

A graduated cylinder contains water at the 17.2 mL mark. If you add 2.8 mL of another liquid, what is the total volume, and how many significant figures should your answer have?

Accepted Answer

$$20.0\ 	ext{mL}$$, 3 significant figures

Question 5

Which of the following is the correct chemical formula for laughing gas?

Accepted Answer

$$N_2O$$

Question 6

A patient weighs 85 kg. What is the patient’s weight in pounds? (Use $$1\ 	ext{kg} = 2.205\ 	ext{lb})$$

Accepted Answer

$$187\ 	ext{lb}$$

Question 7

Which prefix represents $$10^{-6} in $$the metric system?

Accepted Answer

micro-

Question 8

A cube of lithium metal measures $$0.82\ 	ext{cm} 	imes 1.45\ 	ext{cm} 	imes 1.25\ 	ext{cm}$$ and has a mass of $$0.794\ 	ext{g}. $$What is the density of lithium in $$	ext{g/cm}^3$$?

Accepted Answer

$$0.53\ 	ext{g/cm}^3$$

Question 9

Which of the following is an example of a homogeneous mixture?

Accepted Answer

Salt water

Question 10

What is the correct conversion factor to convert inches to centimeters?

Accepted Answer

$$1\ 	ext{in} = 2.54\ 	ext{cm}$$

Question 11

A dialysis unit requires $$75,000\ 	ext{mL} of $$distilled water. How many gallons are needed? (Given: $$1\ 	ext{gal} = 4\ 	ext{qt}$$, $$1\ 	ext{L} = 1.057\ 	ext{qt}$$, $$1\ 	ext{L} = 1000\ 	ext{mL})$$

Accepted Answer

$$19.8\ 	ext{gal}$$

Question 12

Which of the following is the correct formula for calculating heat energy required to raise the temperature of a substance?

Accepted Answer

$$	ext{Heat} = 	ext{SH} 	imes 	ext{mass} 	imes \Delta T$$

Question 13

Convert $$25.0\ ^\circ	ext{C} to $$Kelvin.

Accepted Answer

$$298.2\ 	ext{K}$$

Question 14

Which of the following is an exact number?

Accepted Answer

The number of students in a classroom

Question 15

A doctor orders 4 tablets of amoxicillin per day for 10 days. Each tablet contains $$250\ 	ext{mg} of $$amoxicillin. How many ounces of medication are given in 10 days? ($$1\ 	ext{oz} = 28,350\ 	ext{mg})$$

Accepted Answer

$$0.35\ 	ext{oz}$$

Question 16

Which of the following statements about significant figures is correct?

Accepted Answer

Zeros between nonzero digits are significant.

Question 17

The density of blood is $$1.027\ 	ext{g/mL} at$$ $$25\ ^\circ	ext{C}. $$What is the mass of $$12.6\ 	ext{mL} of $$blood?

Accepted Answer

$$12.9\ 	ext{g}$$

Question 18

Which of the following is the correct definition of specific gravity?

Accepted Answer

Specific gravity = density of substance / density of water

Question 19

Which of the following is NOT a physical property?

Accepted Answer

Reactivity with acid

Chapter 1: Matter & Measurement – Foundations of Chemistry

Guida di studio - Domande di pratica

Study guide - Flashcard