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Pure Substances and Mixtures Quiz

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Questions and Answers

What is a mixture?

A chemical compound

An element in solid form

A single pure substance

Two or more pure substances combined (correct)

All substances encountered in daily life are pure substances.

False (B)

What are the components of a soft drink?

Liquid water, solid sugar, and carbon dioxide gas.

Breads are mixtures of yeast, flour, sugar, water, air, and other __________.

chemicals Signup and view all the answers

Match the following substances with their classification:

Soft drink = Mixture Table salt = Pure substance Air = Mixture Gold = Pure substance Signup and view all the answers

Why can the properties of mixtures differ in different samples?

They contain different amounts of substances. (D) Signup and view all the answers

Ink is considered a mixture.

True (A) Signup and view all the answers

What happens during the ink test with filter paper?

The water soaks into the filter paper, spreading the ink. Signup and view all the answers

What defines a pure substance?

A substance that contains only one kind of particle (A) Signup and view all the answers

Pure water can be easily found in nature.

False (B) Signup and view all the answers

Give an example of a pure substance.

Diamond Signup and view all the answers

All samples of a pure substance have the same properties, regardless of their ______.

size Signup and view all the answers

Match the following examples with their classification:

Diamond = Pure Substance Water = Mixture Table Sugar = Pure Substance Spring Water = Mixture Signup and view all the answers

Which of the following is an example of refining to create a pure substance?

Extracting aluminum from ore (D) Signup and view all the answers

All pure substances have different properties depending on their origin.

False (B) Signup and view all the answers

Why are reference lists of pure substances important for scientists?

They provide standardized properties for comparison. Signup and view all the answers

Study Notes

Pure Substances and Mixtures

Matter is made of particles. Different substances have different properties due to different particle types.
A pure substance contains only one type of particle. Many pure substances exist, but few are naturally found pure in nature.
Water is a pure substance, but even the clearest spring water contains dissolved minerals.
Diamonds are a pure substance, formed deep within the Earth.
Most pure substances encountered daily are refined (e.g., aluminum foil, table sugar).
Pure substances have consistent properties regardless of their size or location. They have fixed melting and boiling points, density, and other properties.
Scientists use reference lists of pure substances and their properties to identify unknown substances.

Mixtures

Almost all natural substances and manufactured products are mixtures of pure substances.
Mixtures contain two or more pure substances.
Mixtures can be combinations of solids, liquids, and gases.
Examples include soft drinks (water, sugar, carbon dioxide), bread (yeast, flour, sugar, water, etc).
The properties of mixtures can vary depending on the relative amounts of different substances in the sample.

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Description

Test your knowledge on the differences between pure substances and mixtures. Understand the properties of matter and how they are classified. This quiz covers the concept of purity in substances and the nature of mixtures with practical examples.