Q: Which of the following statements about positive and negative numbers is correct?

$$(-x) \times (-y) is $$positive.

Question 1

Which of the following best describes the focus of chemistry as a scientific discipline?

Accepted Answer

The study of composition, structure, properties, and reactions of matter.

Question 2

A student observes that a balloon expands as it is heated. Which step of the scientific method does this represent?

Accepted Answer

Observation

Question 3

Which of the following is an example of a chemical, as defined in chemistry?

Accepted Answer

Oxygen gas ($$\mathrm{O_2$})$$

Question 4

A scientist proposes that 'I may be allergic to cats' after noticing itchy eyes near cats. Which step of the scientific method is this?

Accepted Answer

Hypothesis

Question 5

Which of the following is the correct scientific notation for 0.000021?

Accepted Answer

$$2.1 	imes 10$$^{-5}$$

Question 6

If you have 325 mg of aspirin in a 545 mg tablet, what percentage of the tablet is aspirin? Use the formula $$	ext{Percentage} = \frac{	ext{Part}}{	ext{Whole}} 	imes 100.$$

Accepted Answer

$$59.6\%$$

Question 7

Which of the following statements about positive and negative numbers is correct?

Accepted Answer

$$(-x) 	imes (-y) is $$positive.

Question 8

A researcher rearranges the equation $$2x + 5 = 13 to $$solve for $$x. $$What is the value of $$x$$?

Accepted Answer

$$x = 4$$

Question 9

Which of the following is NOT a key question that chemistry asks?

Accepted Answer

How much does it cost?

Question 10

A student writes $$72,000,000 in $$scientific notation. Which is the correct representation?

Accepted Answer

$$7.2 	imes 10$$^{7}$$

Question 11

Which of the following is the correct order of steps in the scientific method?

Accepted Answer

Observation → Hypothesis → Experiment

Question 12

A mixture of milk and fruit is best classified as:

Accepted Answer

A mixture

Question 13

Which of the following is a correct example of writing a number in scientific notation?

Accepted Answer

$$8.0 	imes 10$$^{-6}$$

Question 14

A scientist tests a hypothesis by leaving the house and visiting another cat. Which step of the scientific method is this?

Accepted Answer

Experiment

Question 15

Which of the following is true about the format for scientific notation?

Accepted Answer

The coefficient must be $$\geq 1$$ and $$\u003c 10.$$

Question 16

If you subtract $$-7$$ from $$3$$, what is the result?

Accepted Answer

$$10$$

Question 17

Which of the following is an example of a property that chemistry investigates?

Accepted Answer

The color of a substance

Question 18

A student multiplies $$-2$$ and $$+5. $$What is the sign of the result?

Accepted Answer

Negative

Question 19

Which of the following is a correct example of using place value to identify the digit in the tenths place in $$15.24$$?

Accepted Answer

2

Question 20

A scientist confirms a cat allergy after repeated experiments and observations. What is this process called?

Accepted Answer

Drawing a conclusion

Foundations of Chemistry: Matter, Scientific Method, and Mathematical Skills

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