Answers26-27 CFISD TX-Chemistry A CRScientific Methods

Scientific Methods Answers

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Use the drop-down menus to complete the statements.

Answers:
Ais a factual statement about how something will behave.:law
Ais a well-tested explanation of a set of observations.:theory
Ais a possible explanation of a scientific question that is testable.:hypothesis
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For which of these questions could a testable hypothesis be developed? Check all that apply.

A
Does the width of a rubber band affect how far it will stretch?
B
How does the thickness of a material affect insulation?
C
Which of Nikola Tesla’s inventions was the coolest?
D
Do all objects fall to the ground at the same speed?
E
Which laboratory experiment is the most fun?
5

Which statements describe a good hypothesis? Check all that apply.

A
A good hypothesis is based on one’s personal opinion.
B
A good hypothesis can be tested.
C
A good hypothesis leads to a test with measureable results.
D
A good hypothesis does not always have to be based on prior knowledge or research.
E
A good hypothesis provides a possible explanation to answer a scientific question.
6

Identify the variables in this hypothesis.

Answers:
The independent variable is.:mass
The dependent variable is.:acceleration
7

Yosef is playing with different kinds of rubber bands. Some are very narrow, and some are quite wide. Yosef is curious about the rubber bands and develops this scientific question: Does the width of a rubber band affect how easily it can be stretched?He decides to develop a hypothesis to test this scientific question. What could Yosef’s hypothesis be?

Answer:

PENDING

8

Explain why and how theories may be changed or replaced over time.

Answer:

Theories may change as new information and technologies lead to improved experimental methods and new evidence. If the evidence supports an existing theory, it may be updated. If reliable, relevant evidence does not support it, the theory may be replaced.

9

What happens when an experiment with new information or new technology produces results that support an existing theory?

A
The theory is considered proven.
B
The theory is revised or updated.
C
The theory becomes a law.
D
The evidence is ignored and thrown away.
10

Explain why a law is accepted as fact, but a theory is not.

Answer:

PENDING

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Which facts did you include in your response? Check all that apply.

A
If the width of a rubber band is increased, then it will be more difficult to stretch.
B
A wide rubber band is more difficult to stretch because it takes more force to stretch it.
C
If the width of a rubber band is decreased, then it will be easier to stretch.
D
A narrow rubber band is easier to stretch because it takes less force to stretch it.
13

Which points did you include in your response? Check all that apply.

A
New information and technology may be developed.
B
New experimental methods provide new information.
C
The theory may or may not be supported by new information.
D
The theory may be changed or replaced.
14

Which points did you include in your response? Check all that apply.

A
A theory may be incomplete or incorrect.
B
A theory may change due to new knowledge provided by new information or technology.
C
A law is a factual statement.
D
No exceptions to laws have been found.

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