Year 9 Science · Unit 4 · Lesson 2

Identifying Scientifically Testable Claims

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Learning Goals

Rewrite vague or untestable claims so they become scientifically testable.
Turn a claim into an if-then hypothesis that names a change and a measurement.
Decide when one investigation is enough and when a series is needed.

Warm Up

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.

A claim is scientifically testable as long as it sounds confident and uses science words.

Correct it:

A hypothesis is a testable prediction that links a change you make to a result you can measure.

Correct it:

A broad claim such as "this fertiliser helps every vegetable" can be fully tested with one experiment on tomatoes.

Correct it:

A claim that no possible evidence could ever prove false is not scientifically testable.

Correct it:

Your Turn

Make it testable

Each claim below is too vague to test. Rewrite each one so it names something you could observe and measure, then write an if-then hypothesis for it.

Untestable claim	Rewrite as a testable claim	If-then hypothesis
This tonic boosts your inner energy.
This study lamp helps seedlings grow.
This stain remover gets out grass stains well.

Show What You Know

Scenario

An advertisement says: "This new plant food makes every kind of vegetable in your garden grow bigger and faster." A Year 9 student wants to test whether the advertisement is true.

1. Turn the advertisement's claim into one clear if-then hypothesis you could test on a single vegetable. Name what you would change and what you would measure.

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2. The student grows tomatoes with and without the plant food and the tomatoes do grow bigger. Explain why this single experiment is not enough to support the full advertisement, and what series of investigations would be needed.

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Wrap Up

In one sentence, what was the main idea of this lesson?