Understanding Substances and Mixtures

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Questions and Answers

What primarily determines the properties of a substance?

The color of the molecules
The size of the substance
The temperature of the environment
The properties of its atoms (correct)

All molecules of a substance are different from each other.

False (B)

What happens to the molecules of a solid when they are mixed with a liquid and are attracted to the liquid molecules?

They attach and spread together evenly.

Some solids do not dissolve in water because their molecules are not ______ to the molecules of the liquid.

<p>attracted</p> Signup and view all the answers

Match the following substances with their behavior when mixed with water:

<p>Sugar = Dissolves in water Sand = Does not dissolve in water Salt = Dissolves in water Oil = Does not mix evenly with water</p> Signup and view all the answers

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Study Notes

What Makes Substances Different?

All molecules of the same substance are identical.
Different substances have different molecules.
The properties of a substance are determined by its molecules.
Different molecules have different properties.

Mixing Solids and Liquids

Some solids dissolve in water, while others do not.
When solids dissolve in a liquid, the solid molecules attach to the liquid molecules, spreading evenly.
When solids do not dissolve in a liquid, the solid molecules remain clustered together.