Question 1

Which area of chemistry focuses on the study of all chemicals containing carbon, and why is this area particularly important in biological sciences?

Accepted Answer

Organic chemistry; because most biomolecules, such as proteins and DNA, are carbon-based

Question 2

Early alchemists contributed to modern chemistry by developing practical laboratory procedures. Which of the following is an example of such a procedure still used today?

Accepted Answer

Distillation

Question 3

A scientist measures the mass of a sample as 12.34 g and its volume as 4.2 mL. What is the density of the sample, and which property does density represent?

Accepted Answer

Density $$= \frac{12.34}{4.2} = 2.94\ \mathrm{g/mL}$$; density is an intensive property

Question 4

Which of the following best describes a physical property?

Accepted Answer

A property that can be observed or measured without changing the substance's composition

Question 5

A student records the boiling point of water as 99.8°C. The accepted value is 100.0°C. What is the accuracy of the student's measurement?

Accepted Answer

The measurement is accurate because it is close to the accepted value

Question 6

Which of the following is an example of an exact number in scientific measurements?

Accepted Answer

The number of students in a classroom

Question 7

A measurement is recorded as 0.00450 m. How many significant figures does this measurement have?

Accepted Answer

3

Question 8

Which statement correctly describes the relationship between temperature and the density of a substance?

Accepted Answer

As temperature increases, density generally decreases because volume increases while mass remains the same

Question 9

A scientist uses the scientific method to investigate a chemical reaction. Which step comes immediately after formulating a hypothesis?

Accepted Answer

Experimenting

Question 10

Which of the following measurements is expressed in scientific notation and has three significant figures?

Accepted Answer

$$5.19 	imes 10$$^{-14}$$

Question 11

Which of the following is NOT a reason to study chemistry according to the provided materials?

Accepted Answer

To create new elements in the laboratory

Question 12

Which of the following statements about solids is correct?

Accepted Answer

Solids have a definite shape and volume, and their shape does not depend on the container

Question 13

A student measures the mass of a block as 250 g and its volume as 100 cm³. What is the density of the block?

Accepted Answer

$$\frac{250}{100} = 2.5\ \mathrm{g/cm^3$}$$

Question 14

Which of the following is a qualitative observation?

Accepted Answer

The solution turned blue after the reaction

Question 15

Which area of chemistry would most likely be involved in determining the concentration of lead in drinking water?

Accepted Answer

Analytical chemistry

Question 16

If the pressure on a gas sample increases while its mass remains constant, what happens to its density?

Accepted Answer

Density increases because volume decreases

Question 17

Which of the following is a correct statement about significant figures in measurements?

Accepted Answer

All nonzero digits are always significant

Question 18

Which of the following best describes the difference between mass and volume?

Accepted Answer

Mass is the amount of matter an object contains, while volume is the space it occupies

Question 19

Which of the following is NOT a step in the scientific method?

Accepted Answer

Ignoring data that does not fit the hypothesis

Introduction to Chemistry and Matter: Foundations for General Biology

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