AnswersCR SS Chemistry S2 201819 2026Scientific Notation and Significant Figures

Hypotheses, Laws, and Theories Answers

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Ava’s best friend has an indoor cat. Ava notices that she sneezes every time that she visits her friend. Ava suspects that she is allergic to cats but is unsure. What is the best thing for Ava to do next?

A
Stop visiting her friend.
B
Conclude that she is allergic to cats, and avoid them completely.
C
Test her suspicion by going to see an allergist to diagnose the allergy.
D
Assume that the sneezing has another cause, and reject her original idea.
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When may a hypothesis be revised?

A
never
B
after experimental data is collected
C
after it has been proven to be correct
D
after at least one year from when it was first tested
3

Which is least likely to occur after an experiment is conducted to test a hypothesis?

A
The data is analyzed to see if it supports or refutes the hypothesis.
B
The same experiment is conducted again to see if the data are reliable.
C
The hypothesis becomes a theory if the results support it.
D
A new experiment is designed to provide additional data about the hypothesis.
4

What is the primary difference between a hypothesis and a theory?

A
A theory is supported by more data and observations than a hypothesis is.
B
A hypothesis is falsifiable, but a theory has been proven to be correct.
C
A theory is a prediction, but a hypothesis is an explanation.
D
A hypothesis is more reliable than a theory.
5

Jia observes that adding a solution of sodium hydroxide to a clear liquid turns the liquid pink. She makes a hypothesis about why the liquid changed color. Which characteristic is least important for her hypothesis to have?

A
ability to be tested
B
based on the opinion of her classmates
C
ability to be proven incorrect
D
based on her current knowledge
6

A student is trying to create a table that compares hypotheses, theories, and laws. HypothesisTheoryLawDo scientific researchers formulate it?YesYesYesDoes it explain why things happen?YesYesNo____YesYesYesIs it used to make predictions?NoYesYesWhich of the following questions would most likely fill the blank in the table?

A
Is it an intelligent guess?
B
Is it newly formulated?
C
Is it based on observations?
D
Has it been proved?
7

Jenna is a scientist in a chemistry lab. Her experiment did not support her current theory. What should she do next?

A
Revise her theory because it must be incorrect.
B
Disregard the data because they must be inaccurate.
C
Verify the data by running the experiment several more times.
D
Publish a paper that explains the data.
8

When scientists say that a theory can never be proven, what are they actually saying?

A
There is no way to test the accuracy of a theory.
B
Theories should not be used to make predictions.
C
Theories do not need to be tested or challenged.
D
It is always possible for new data to contradict a theory.
9

Which statement correctly compares a law and a theory?

A
A law provides an explanation, while a theory simply describes observations.
B
A law is supported by data, while a theory is merely a guess.
C
Neither a law nor a theory can be proved false.
D
Both a law and a theory can be tested.
10

When a theory is disproved by further evidence, which of the following occurs?

A
It should be considered a failure.
B
It adds to scientific knowledge.
C
It becomes a law.
D
New data must be found to support it.

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