Question 1

Which of the following best defines chemistry?

Accepted Answer

The study of matter—its properties, composition, and the changes it undergoes.

Question 2

Which of the following is NOT considered matter?

Accepted Answer

Sunlight

Question 3

A scientist observes that a patient’s blood pressure is high. According to the scientific method, what is the next logical step?

Accepted Answer

Formulate a hypothesis

Question 4

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

Accepted Answer

If the patient reduces sodium intake, their blood pressure will decrease.

Question 5

Which of the following best describes a scientific theory?

Accepted Answer

A testable and broad explanation supported by a large body of evidence.

Question 6

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

Accepted Answer

Observation → Hypothesis → Experiment → Data Analysis → Conclusion → Peer Review & Publish

Question 7

Which of the following statements represents an observation?

Accepted Answer

A nurse records the patient’s resting pulse as 32 beats per minute.

Question 8

Which of the following is written in correct scientific notation?

Accepted Answer

$$5.220 x 10^3$$

Question 9

Convert $$1.25 	imes 10$$^{-4}$$ to standard notation.

Accepted Answer

0.0000125

Question 10

Convert 377,000 to scientific notation.

Accepted Answer

$$3.77 	imes 10$$^{5}$$

Question 11

Which component of the scientific method is best represented by the statement: “Gravity is the reason that an object tossed into the air comes back down”?

Accepted Answer

Theory

Question 12

A student converts $$0.0000145 to $$scientific notation. What is the correct answer?

Accepted Answer

$$1.45 	imes 10$$^{-5}$$

Question 13

Which of the following is a real-world example of applying the scientific method in medicine?

Accepted Answer

A nurse records patient data, forms a hypothesis about a treatment, tests it, and analyzes the results.

Question 14

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

Accepted Answer

Ignoring data that does not fit the hypothesis

Question 15

A value is written as $$3.20 	imes 10$$^{-9}$$. What is its standard notation?

Accepted Answer

0.0000000032

Question 16

Which of the following best describes a scientific law?

Accepted Answer

A testable phenomenon that is always true.

Question 17

If a number in scientific notation has a negative exponent, what does this indicate?

Accepted Answer

The coefficient value should be made smaller.

Question 18

Which of the following is a correct conversion of $$1.6100 	imes 10$$^{4}$$ to standard notation?

Accepted Answer

16,100

Question 19

A patient’s blood pressure is measured as 120/80 mmHg. Which type of data is this?

Accepted Answer

Quantitative

Question 20

Which of the following is a plausible but incorrect scientific notation for 707.82?

Accepted Answer

$$7.0782 	imes 10$$^{3}$$

Ch.1 Chemistry in Our Lives: Foundations, Scientific Method, and Scientific Notation

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