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Solubility Investigation Planning

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Solubility Investigation Planning

A baseball team wants to mix a clear drink for a hot game. Your job is to plan a fair test of how different substances dissolve in water. Use the evidence and planning tools on this page. Do not taste any lab materials.

Plan a fair test

Soluble substances dissolve in a liquid to form a mixture that looks uniform. Insoluble substances do not dissolve completely; they may settle, float, or remain visible. Hiroshi and Jamal will compare table salt, sugar, and sand in water.

1.Which statement best describes a soluble substance?

It dissolves in a liquid to form a uniform mixture.
It always floats on top of a liquid.
It changes into a new substance every time it is stirred.
It disappears because it evaporates.

2.Before testing, predict which of these will dissolve in water: table salt, sugar, or sand. Explain one reason for your prediction.

3.Jamal tests one teaspoon of salt in 100 mL of water and two teaspoons of sugar in 200 mL of water. Why is this not a fair comparison?

4.Choose the best independent variable for comparing salt, sugar, and sand.

The type of solid added
The volume of water in each cup
The number of times each cup is stirred
The temperature of the water

5.Fill in the investigation plan: Independent variable: . Dependent variable (what you observe or record): . Name two factors to keep the same.

6.Put the steps in a sensible order by writing 1–4 beside each: ___ Stir each cup for the same amount of time. ___ Add the same measured amount of a solid to each cup. ___ Observe and record whether solid remains. ___ Pour the same volume of water into three labeled cups.

7.Write a testable hypothesis for the comparison. Use an “If…, then…, because…” format.

8.Which observation is the strongest evidence that a solid dissolved?

The solid is no longer visible after stirring, and the liquid looks uniform.
The cup feels heavier than before.
The solid is still in a pile at the bottom.
The liquid was stirred quickly.

9.Make an observation table for the test. Include a row for each solid and columns for the amount added, stirring time, and what you observe.

10.True or false: The team should taste the mixtures to check whether a solid dissolved.

TrueFalse

11.Elijah wants to find out whether warmer water affects how quickly sugar dissolves. Name the factor he should change and two factors he should keep the same.

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More Science Worksheets

7th Grade

Solubility Investigation Planning

Solubility Investigation Planning

Plan a fair test

2 printable pages

About This Worksheet

Free in Kuraplan

Print-Ready

AI-Generated

For Teachers & Parents

Need a custom version of this worksheet?

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