Pure And Impure Substances

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| By Manjubrijesh2014

Manjubrijesh2014

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1/5 Questions

Substances with only one type of atom is called
- Element
- Compound
- Mixture

About This Quiz

Explore the basics of pure and impure substances in this quiz. Understand elements, compounds, and mixtures, and learn how impurities affect boiling points. Ideal for learners interested in fundamental chemistry concepts.

2.

Carbon di oxide is an example of
- Element
- Compound
- Mixture
Correct Answer

A. Compound

Explanation

Carbon dioxide (CO2) is an example of a compound. Compounds are substances that are made up of two or more different elements chemically combined in a fixed ratio. Carbon dioxide is composed of one carbon atom bonded to two oxygen atoms. It is formed through the chemical reaction between carbon and oxygen. Compounds have properties different from their constituent elements and can only be separated into their individual elements through chemical reactions.

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7
3.

Pure substances have .........boiling point
- Fixed
- Changing
Correct Answer

A. Fixed

Explanation

Pure substances have a fixed boiling point because they consist of only one type of molecule or element. The intermolecular forces between the particles in a pure substance are consistent, resulting in a specific temperature at which the substance transitions from a liquid to a gas. This fixed boiling point allows for the identification and characterization of pure substances based on their boiling points. Impurities or mixtures, on the other hand, can cause variations in boiling points due to the presence of different molecules with different intermolecular forces.

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4
4.

Boiling point ...........when we add impurity
- Stays the same
- Decreases
- Increases
Correct Answer

A. Increases

Explanation

When we add impurities to a substance, it disrupts the regular arrangement of its molecules. This disruption weakens the intermolecular forces between the molecules, making it easier for them to escape into the gas phase. As a result, the boiling point of the substance increases because it requires more energy to break these weaker intermolecular forces and convert the substance from a liquid to a gas.

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3
5.

Substances which can be separated easily ......................
- Mixture
- Elements
- Compounds
Correct Answer

A. Mixture

Explanation

A mixture refers to a combination of substances that can be easily separated from each other. Unlike elements and compounds, which are pure substances, mixtures are made up of two or more components that retain their individual properties. Mixtures can be separated through physical methods such as filtration, distillation, or evaporation, as the different components have different physical properties. Therefore, the correct answer is mixture.

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8

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Mar 25, 2025

Quiz Edited by
ProProfs Editorial Team
Sep 13, 2020

Quiz Created by
Manjubrijesh2014

Pure And Impure Substances

Substances with only one type of atom is called

Quiz Preview

Carbon di oxide is an example of

Pure substances have .........boiling point

Boiling point ...........when we add impurity

Substances which can be separated easily ......................