Question 1

Which of the following best describes a scientific law?

Accepted Answer

A statement that predicts behavior and is always true based on repeated observations.

Question 2

A scientist notices that a certain chemical reaction always produces the same amount of product under identical conditions. What step of the scientific method does this represent?

Accepted Answer

Observation

Question 3

Which of the following is an example of a hypothesis?

Accepted Answer

If I water my plants more, they will grow faster.

Question 4

A student wants to test if drinking coffee at night affects sleep. She decides to drink coffee only in the morning for a week and records her sleep quality. Which part of the scientific method is she performing?

Accepted Answer

Experiment

Question 5

After conducting several experiments, a scientist finds that the results do not support her hypothesis. What should she do next according to the scientific method?

Accepted Answer

Modify the hypothesis and test again.

Question 6

Which of the following scenarios best illustrates the use of the scientific method in a real-world context?

Accepted Answer

A doctor suspects a patient’s symptoms are due to a food allergy, tests the patient with different foods, and concludes the allergy is to peanuts.

Question 7

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

Accepted Answer

Observation → Hypothesis → Experiment → Conclusion

Question 8

A researcher observes that a certain medication lowers blood pressure in patients. She proposes that the medication works by relaxing blood vessels. What is her proposal called?

Accepted Answer

Hypothesis

Question 9

If an observation is always true and measurable, what can it become according to the scientific method?

Accepted Answer

A law

Question 10

Which of the following best describes the difference between a hypothesis and a conclusion?

Accepted Answer

A hypothesis is a proposed explanation; a conclusion is a decision based on experimental results.

Question 11

A patient claims that drinking decaffeinated coffee helps her sleep better at night. She decides to drink only decaffeinated coffee for a week and records her sleep quality. What is the independent variable in her experiment?

Accepted Answer

Type of coffee (decaffeinated vs. regular)

Question 12

Which of the following statements is an example of a conclusion in the scientific method?

Accepted Answer

I sleep better at night because I stopped drinking caffeinated coffee.

Question 13

A scientist performs an experiment to test whether a new fertilizer increases plant growth. She finds that plants with the new fertilizer grow taller than those without. What should she do next?

Accepted Answer

Draw a conclusion based on the results.

Question 14

Which of the following best illustrates the concept of modifying a hypothesis?

Accepted Answer

After experiments do not support the original hypothesis, the scientist proposes a new explanation and tests it.

Question 15

In the context of the scientific method, what is the primary purpose of performing experiments?

Accepted Answer

To test the validity of a hypothesis.

Question 16

A researcher observes that people who exercise regularly have lower blood pressure. She hypothesizes that exercise causes this effect. She then designs a study to compare blood pressure in people who exercise and those who do not. What is the dependent variable in her study?

Accepted Answer

Blood pressure

Question 17

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

Accepted Answer

Guessing the outcome without testing

Question 18

A scientist finds that her experimental results do not match her hypothesis. According to the scientific method, what is the next logical step?

Accepted Answer

Revise the hypothesis and conduct new experiments.

Question 19

Which of the following best describes the role of experiments in the scientific method?

Accepted Answer

Experiments are used to test the relationship between a hypothesis and observations.

Question 20

A student observes that she sneezes every time she visits a friend with a cat. She hypothesizes that she is allergic to cats and tests this by visiting other friends with cats. She sneezes each time. What is the most reasonable conclusion?

Accepted Answer

She is likely allergic to cats.

Chapter 1: Chemistry in Our Lives – The Scientific Method

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