Question

1. use the word - bank to complete each sentence below. each word will only be used once. constant, control group, hypothesis, dependent variable, test group, independent variable

the variable that is measured in the experiment.
group in the experiment that is being experimented upon (has the iv).
a testable prediction about why an observation may have occurred.
group in the experiment that is used as a basis of comparison (no iv).
the variable that is changed in the experiment.
factors that are not changed between the control and experimental group because they are not being tested.

1. in order for a hypothesis to be testable, only one variable can be changed. a. true b. false
2. the diagram to the right is a beaker. a. true b. false
3. if a hypothesis is not supported by the data, the experiment must be conducted again until the results align with the original hypothesis. a. true b. false
4. if chemicals get in your eyes, you must rinse them for at least 15 minutes. a. true b. false
5. crucibles are used to grind up solid chemicals into a fine powder and crush solids into small pieces. a. true b. false
6. experimentation is not the only way for scientists to advance science and make discoveries. a. true b. false
7. no food or drink is allowed in the lab except for water. a. true b. false

Explanation:

1. The variable measured in an experiment is the dependent variable. It changes in response to the independent variable.
2. The group being experimented on with the independent - variable is the test group.
3. A testable prediction about an observation is a hypothesis.
4. The group used as a basis of comparison (no IV) is the control group.
5. The variable that is changed in an experiment is the independent variable.
6. Factors not changed between control and experimental groups are constants.
7. For a hypothesis to be testable, only one variable can be changed to accurately determine cause - and - effect relationships.
8. The diagram is of a beaker.
9. If a hypothesis is not supported by data, the experiment should not be repeated until it aligns with the original hypothesis. Science is about objective results, and hypotheses may need to be revised.
10. If chemicals get in eyes, rinsing for at least 15 minutes is a standard safety procedure.
11. Crucibles are used for heating substances, not for grinding. Mortars and pestles are used for grinding.
12. Experimentation is not the only way for scientists to advance science. Observational studies, theoretical work, etc., are also important.
13. In a lab, generally no food or drink is allowed, not even water in some strict labs.

Answer:

1. Dependent Variable
2. Test Group
3. Hypothesis
4. Control Group
5. Independent Variable
6. Constant
7. A. True
8. A. True
9. B. False
10. A. True
11. B. False
12. A. True
13. B. False