Scientific Knowledge

Evolution is one example of a theory. From what you know about the scientific method, what can you conclude about this biological theory?

• It's been tested many times.

• Scientists don't need to test it anymore.

• No one is allowed to test whether it's true or not.

• There is very little evidence to support it.

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Which of the following is a testable hypothesis?

• Roses are more beautiful than violets.

• A plant needs at least five hours of sunlight per day to grow.

• Ice cream is delicious.

• Humans will someday land on Mars.

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What happens if you test a hypothesis multiple times and the data doesn't support your prediction?

• Change the data to support your prediction

• Run the experiment again until you get the results you're looking for

• Conclude that your hypothesis cannot be proven

• Re-think your hypothesis

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Which of these answers best describes a scientific theory?

• an explanation based on the opinion of a scientist

• a well-supported and widely accepted explanation of nature

• a description of a specific relationship under given conditions

• a statement describing what always happens under certain conditions

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Which of these claims best describes how scientific idea change?

• New evidence leads to modification of ideas

• Scientific ideas rarely change, because they are based on extensive evidence

• As a scientific idea changes, it eventually becomes a scientific theory and then a law

• Scientists form opinions based on evidence and decide how the idea should change

The figure illustrates evidence supporting kinetic theory of matter, which describes the behavior of gases based on the motions of the particles. Which claim best describes how evidence in the example supports kinetic theory?

• The balloon gets bigger as the temperature of the gas inside it increases

• The balloon gets bigger as the temperature of the gas inside it increases because the gas particles move faster and get farther apart

• The balloon gets smaller as the temperature of the gas inside it increases

• The balloon gets smaller as the temperature of the gas inside it increases because the gas particles move more slowly and get closer together

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Which of these scientists would most likely engage in fieldwork to observe organisms?

• chemist

• biologist

• physicist

• mathematician

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A statement that describes the way the world works under certain conditions

• empirical evidence

• scientific theory

• scientific law

• scientific method

An explanationof nature that is well-supported and widely accepted

• empirical evidence

• scientific theory

• scientific law

• scientific method

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A chemist wants to examine specific chemical reactions and isolate certain products using a controlled experiment. How would the chemist perform this experiment?

• in a laboratory

• out in the field

• by performing a survey

• by using scientific laws

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