Question 1

A patient is given a medication that is a homogeneous mixture dissolved in water. Which of the following best describes this medication?

Accepted Answer

A homogeneous mixture because it is uniform throughout

Question 2

A chemist measures the mass of a sample as 12.345 g, 12.347 g, and 12.346 g in three trials. The true mass is 12.400 g. Which statement best describes the measurements?

Accepted Answer

The measurements are precise but not accurate

Question 3

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

Accepted Answer

Burning wood in a fireplace

Question 4

A student needs to convert 250.0 mL of a solution to liters using dimensional analysis. Which of the following is the correct answer?

Accepted Answer

0.2500 L

Question 5

Which property is intensive and can be used to help identify a substance regardless of sample size?

Accepted Answer

Density

Question 6

A scientist observes a color change and gas formation when two clear solutions are mixed. According to the scientific method, what is the next logical step?

Accepted Answer

Formulate a hypothesis to explain the observations

Question 7

Which of the following best illustrates the symbolic domain of chemistry?

Accepted Answer

Writing H2O to represent water

Question 8

A 50.0 g sample of a metal is heated and its temperature increases from 20.0°C to 45.0°C. Which of the following is an extensive property involved in this scenario?

Accepted Answer

Mass

Question 9

Which statement correctly distinguishes between mass and weight?

Accepted Answer

Mass is constant regardless of location, while weight depends on gravity

Question 10

A sample of gas occupies 2.50 L at room temperature. What is this volume in cubic centimeters (cm³)? (1 L = 1000 cm³)

Accepted Answer

2500 cm³

Question 11

A student records the following measurements: 3.45 g, 3.4 g, and 3.456 g. According to significant figure rules, what is the correct sum of these values?

Accepted Answer

10.3 g

Question 12

Which of the following is a derived SI unit?

Accepted Answer

Liter

Question 13

A nurse needs to convert a patient’s temperature from 102.2°F to Celsius. Which is the correct value? (TF = 9/5 TC + 32)

Accepted Answer

39.0°C

Question 14

Which of the following best describes plasma?

Accepted Answer

An ionized gas found in stars and lightning

Question 15

Which scenario best demonstrates the law of conservation of matter?

Accepted Answer

A log burning and producing ash, smoke, and gases with total mass equal to the original log

Question 16

Which of the following is an example of a physical property?

Accepted Answer

Melting point

Question 17

A solution is prepared by mixing 10.0 g of NaCl with 90.0 g of water. Which statement is true?

Accepted Answer

The solution is a homogeneous mixture

Question 18

Which of the following is an exact number?

Accepted Answer

The number of students in a classroom

Question 19

A chemist needs to prepare 0.500 kg of a solution. How many grams is this?

Accepted Answer

500 g

Question 20

Which of the following best describes a molecule?

Accepted Answer

Two or more atoms bonded together

Essential Concepts of Chemistry: Matter, Measurement, and Scientific Method

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