$$185 \div 2.205 = 83.9 \text{ kg}$$

$$1.05 \times 15.0 = 15.75 \text{ g}$$

Question 1

Which of the following best describes a chemical change?

Accepted Answer

Burning a candle

Question 2

A scientist observes that a metal tool left outside has rusted. Which property is being demonstrated?

Accepted Answer

Chemical property

Question 3

Which phase change requires energy input and is reversible?

Accepted Answer

Melting

Question 4

According to the Law of Conservation of Energy, which statement is correct?

Accepted Answer

Energy can only be transferred or transformed

Question 5

Which step in the scientific method involves testing a proposed explanation?

Accepted Answer

Experiment

Question 6

A balance displays a mass of 10.0 g. How many significant figures are in this measurement?

Accepted Answer

3

Question 7

Which of the following is an exact number?

Accepted Answer

The number of quarters in a dollar (4)

Question 8

Convert 0.000000505 meters to scientific notation.

Accepted Answer

$$5.05 	imes 10$$^{-7}$$

Question 9

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

Accepted Answer

Micro (\mu)

Question 10

A patient weighs 185 lbs. What is their weight in kilograms? (Use $$1 	ext{ kg} = 2.205 	ext{ lbs})$$

Accepted Answer

$$185 \div 2.205 = 83.9 	ext{ kg}$$

Question 11

Which of the following is the correct relationship for converting Celsius to Kelvin?

Accepted Answer

$$K = ^\circ C + 273.15$$

Question 12

How many significant figures are in the number 0.01704?

Accepted Answer

4

Question 13

Round 102.56070 to four significant figures and write in scientific notation.

Accepted Answer

$$1.026 	imes 10$$^{2}$$

Question 14

A child is prescribed 45 mg amoxicillin every 12 hours. The available suspension contains 125 mg per 5.0 mL. How many mL should be given?

Accepted Answer

1.8 mL

Question 15

Which of the following best describes precision?

Accepted Answer

How close successive measurements are to each other

Question 16

A saline solution has a density of $$1.05 	ext{ g/mL}. $$What is the mass of 15.0 mL of this solution?

Accepted Answer

$$1.05 	imes 15.0 = 15.75 	ext{ g}$$

Question 17

Which of the following is a physical property?

Accepted Answer

Boiling point

Question 18

Which of the following is NOT a base quantity in the SI system?

Accepted Answer

Volume

Question 19

A patient is prescribed 2.8 mL of medicine. If 1 tsp = 5 mL, how many teaspoons should be given?

Accepted Answer

0.56 tsp

Question 20

Which of the following best describes a scientific law?

Accepted Answer

A description of observations without explanation

Chapter 1: Science & Measurements – Foundations of Chemistry

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