Question

snc2p chemistry unit
questions: true or false
name:
if the answer is true, write \true\ on the line. if the answer is false, replace the underlined word or phrase with one that will make the sentence correct. write the new word(s) on the line.

1. forming a hypothesis is the first step of the scientific method.
2. in order for a hypothesis to be testable, scientists need to be able to carry out investigations that will either support or disprove it.
3. the experimental group is the group that is left alone during the experiment.
4. the manipulated variable is the same thing as the independent variable.

matching: match the word to the definition. write the letter on the line.

1. scientific inquiry
2. hypothesis
3. control group
4. experimental group
5. independent variable
6. dependent variable
7. scientific theory
8. scientific law

variable - something that is changed.
in scientific experiments there are two variables: one that you control and one that is the result.

1. the independent variable

\the cause\
the one thing that is changed in an experiment
this variable makes one test \independent\ of another test
on a graph it is on the x - axis (along the bottom)

1. the dependent variable

\the effect\
the result of the experiment
what is measured
this \depends\ on what you changed
on a graph, it is on the y - axis (along the vertical side)

Explanation:

1. The first step of the scientific method is making an observation, not forming a hypothesis, so it's false.
2. For a hypothesis to be testable, scientists must be able to conduct investigations to support or disprove it, so it's true.
3. The control group is left alone during the experiment, not the experimental group, so it's false.
4. The manipulated variable is indeed the same as the independent variable, so it's true.

For matching:

1. Scientific inquiry is the many ways scientists study the natural world (D).
2. Hypothesis is a possible answer to a scientific question (E).
3. Control group is left alone and not experimented on (G).
4. Experimental group shows the effect of the variable being tested (A).
5. Independent variable is the one variable that is changed (B).
6. Dependent variable is the variable that gets measured (H).
7. Scientific theory is a well - tested explanation for experimental results (C).
8. Scientific law describes an observed pattern in nature (F).

Answer:

1. False, Making an observation
2. True
3. False, Control group
4. True
5. D
6. E
7. G
8. A
9. B
10. H
11. C
12. F