Question 1

Which of the following best describes a chemical as defined in chemistry?

Accepted Answer

A substance that has the same composition and properties wherever it is found.

Question 2

A scientist observes that a plant grows faster in sunlight than in shade. She proposes, 'Plants need sunlight to grow quickly.' According to the scientific method, what is this statement?

Accepted Answer

A hypothesis

Question 3

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

Accepted Answer

Observation $$\rightarrow$$ Hypothesis $$\rightarrow$$ Experiment $$\rightarrow$$ Conclusion

Question 4

A student measures the mass of a rock as 12.34 g. Which of the following best describes this number?

Accepted Answer

A measured number

Question 5

What is the value of $$( -8 ) 	imes 3$$?

Accepted Answer

$$-24$$

Question 6

Which of the following best describes the place value of the digit 4 in the number 5,421?

Accepted Answer

Hundreds

Question 7

A sample contains 15 g of substance A in a total of 60 g. What percentage of the sample is substance A?

Accepted Answer

$$25\%$$

Question 8

Which of the following is the correct scientific notation for 0.00052?

Accepted Answer

$$5.2 	imes 10$$^{-4}$$

Question 9

Convert $$7.2 	imes 10$$^{4}$$ to standard notation.

Accepted Answer

$$72,000$$

Question 10

Which axis is the vertical axis on a graph?

Accepted Answer

Y-axis

Question 11

A student solves the equation $$2x + 6 = 14. $$What is the value of $$x$$?

Accepted Answer

$$4$$

Question 12

Which of the following best describes a direct relationship between two variables?

Accepted Answer

When one variable increases, the other variable also increases.

Question 13

Which of the following is the correct way to write 4,500 in scientific notation?

Accepted Answer

$$4.5 	imes 10$$^{3}$$

Question 14

A student subtracts $$12 - ( -5 ). $$Using the subtraction rule (Keep $$\rightarrow$$ Change $$\rightarrow$$ Add), what is the result?

Accepted Answer

$$17$$

Question 15

Which of the following is an example of an exact number?

Accepted Answer

The number of students in a classroom

Question 16

A nurse needs to calculate 20% of an 80 mg medication dose for a patient. What is the correct dose?

Accepted Answer

$$16 mg$$

Question 17

Which of the following is the correct coefficient in the scientific notation $$7.2 	imes 10$$^{4}$$?

Accepted Answer

$$7.2$$

Question 18

A student adds $$-7 + 12. $$According to the rules for addition with different signs, what is the result?

Accepted Answer

$$5$$

Question 19

Which of the following best describes the purpose of the scientific method?

Accepted Answer

To develop a conclusion or theory using observations, hypotheses, and experiments.

Question 20

A student converts $$8.6 	imes 10$$^{-4}$$ to standard notation. What is the correct answer?

Accepted Answer

$$0.00086$$

Chapter 1: Matter, Measurements, and Mathematical Operations in Chemistry

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