Q: Which of the following best illustrates the use of scientific notation?

$$0.0000003 cm $$written as $$3 \times 10$$^{-7}$$ cm

Question 1

Which of the following best describes the difference between a scientific theory and a natural law?

Accepted Answer

A law describes a measurable relationship, while a theory explains why that relationship exists.

Question 2

A student observes that a plant is not growing well and hypothesizes that it needs more sunlight. According to the scientific method, what should the student do next?

Accepted Answer

Test the hypothesis by conducting an experiment.

Question 3

Which of the following is an example of a hypothesis?

Accepted Answer

If salt is added to water, then the water will boil at a higher temperature.

Question 4

Which branch of chemistry focuses on the study of substances containing carbon?

Accepted Answer

Organic chemistry

Question 5

A scientist measures the mass of a sample as 0.00450 g. How many significant figures does this measurement have?

Accepted Answer

3

Question 6

Round the number 62.556 to three significant figures according to the rules provided.

Accepted Answer

62.6

Question 7

Which of the following numbers has four significant figures?

Accepted Answer

1002

Question 8

When multiplying $$6.038 by$$ $$2.57$$, what is the correct answer with the proper number of significant figures?

Accepted Answer

$$15.5$$

Question 9

Which of the following best illustrates the use of scientific notation?

Accepted Answer

$$0.0000003 cm $$written as $$3 	imes 10$$^{-7}$$ cm

Question 10

A gas is compressed from $$V_1 to$$ $$V_2 at $$constant temperature. According to Boyle's Law, what happens to the pressure?

Accepted Answer

It increases as volume decreases.

Question 11

Which of the following is NOT a branch of chemistry?

Accepted Answer

Astrochemistry

Question 12

Which of the following statements about significant figures is correct?

Accepted Answer

Zeroes at the end of a number are significant if there is a decimal point.

Question 13

A measurement is recorded as $$2.030 	imes 10^3$ m. How many significant figures does this value have?

Accepted Answer

4

Question 14

Which of the following is the correct scientific notation for the number $$0.00086$$?

Accepted Answer

$$8.6 	imes 10$$^{-4}$$

Question 15

Which of the following is a real-world application of green chemistry?

Accepted Answer

Designing chemical processes that minimize hazardous waste.

Question 16

When adding $$347$$, $$2.03$$, and $$23.6$$, what is the correct answer with the proper number of significant figures?

Accepted Answer

$$373$$

Question 17

Which of the following is an example of a testable hypothesis?

Accepted Answer

If a plant receives more sunlight, then it will grow taller.

Question 18

Which of the following best describes the role of chemistry in society?

Accepted Answer

Chemistry is central to understanding many aspects of the world, including medicine, technology, and the environment.

Question 19

Which of the following is the correct way to round $$62.450 to $$three significant figures?

Accepted Answer

62.4

Question 20

Which of the following statements about the Greeks' view of matter is correct?

Accepted Answer

They believed all substances were combinations of air, fire, water, and earth.

Introduction to Chemistry: Foundations, Methods, and Measurement

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