Year 7 Science · Unit 2 · Lesson 19
Foundation Worksheet
Learning Goals
True or False? Fix the false ones
Circle T or F for each statement. If the statement is false, rewrite it correctly on the line below.
The dependent variable is what you change in a fair test.
Correct it:
Repeating trials three times and averaging the results improves the validity of an experiment.
Correct it:
In a fair test, you should only change ONE variable at a time.
Correct it:
Controlled variables are things you deliberately change during an experiment.
Correct it:
An experiment can be reliable but still not valid if you measure the wrong thing consistently.
Correct it:
Match each term to its definition
Draw a line connecting each term on the left to its correct definition on the right. Or write the matching letter next to each term.
| Term | Your answer | Definition |
|---|---|---|
| Independent variable | A. Getting similar results each time you repeat an experiment | |
| Dependent variable | B. The one thing you deliberately change in a fair test | |
| Controlled variable | C. A testable prediction written as "If… then… because…" | |
| Reliability | D. What you measure — the result that depends on the IV | |
| Validity | E. Something kept the same throughout the experiment | |
| Hypothesis | F. Measuring exactly what you intend to measure; only the IV changes |
1. A student investigates whether stirring speed affects how fast sugar dissolves. Name the independent variable and one controlled variable in this experiment.
2. Write a hypothesis for this investigation: "Does the amount of salt affect how quickly it dissolves in water?" Use the "If… then… because…" format.
Wrap Up
In one sentence, what was the main idea of this lesson?