Unit 1: What Is Chemistry? Matter

1. A mixture can contain two or more substances ______________

A mixture can contain two or more substances because a mixture is a combination of different substances that are physically combined but not chemically bonded. This means that the substances in a mixture can be separated by physical means, such as filtration or evaporation, without undergoing any chemical reactions. Therefore, it is possible for a mixture to contain two or more substances.

Explanation

A mixture can contain two or more substances because a mixture is a combination of different substances that are physically combined but not chemically bonded. This means that the substances in a mixture can be separated by physical means, such as filtration or evaporation, without undergoing any chemical reactions. Therefore, it is possible for a mixture to contain two or more substances.

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2. Air is a pure substance _________________

The given question is incomplete and does not provide any information or options to choose from. Therefore, it is not possible to provide an explanation for the correct answer.

Explanation

The given question is incomplete and does not provide any information or options to choose from. Therefore, it is not possible to provide an explanation for the correct answer.

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3. Filtration and distillation are processes of combining substances ________________

Filtration and distillation are processes of separating substances based on their physical properties, such as size or boiling point. Filtration is used to separate solid particles from a liquid or gas, while distillation is used to separate two or more liquids with different boiling points. These processes are not used for combining substances, but rather for separating them.

Explanation

Filtration and distillation are processes of separating substances based on their physical properties, such as size or boiling point. Filtration is used to separate solid particles from a liquid or gas, while distillation is used to separate two or more liquids with different boiling points. These processes are not used for combining substances, but rather for separating them.

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4. A substance's colour, density and melting point are physical properties _________

The statement "A substance's color, density, and melting point are physical properties" is true. Physical properties are characteristics or attributes of a substance that can be observed or measured without changing the substance's chemical composition. Color, density, and melting point are examples of physical properties because they can be determined through observation or measurement and do not involve any chemical changes in the substance.

Explanation

The statement "A substance's color, density, and melting point are physical properties" is true. Physical properties are characteristics or attributes of a substance that can be observed or measured without changing the substance's chemical composition. Color, density, and melting point are examples of physical properties because they can be determined through observation or measurement and do not involve any chemical changes in the substance.

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5. Physical changes do not affect the composition of a substance ______________

Physical changes do not affect the composition of a substance. This means that even though the substance may undergo a physical change, such as a change in shape, size, or state of matter, the chemical composition of the substance remains the same. The arrangement and bonding of the atoms or molecules within the substance do not change during a physical change. Therefore, the substance can be reverted back to its original form without any alteration in its chemical makeup.

Explanation

Physical changes do not affect the composition of a substance. This means that even though the substance may undergo a physical change, such as a change in shape, size, or state of matter, the chemical composition of the substance remains the same. The arrangement and bonding of the atoms or molecules within the substance do not change during a physical change. Therefore, the substance can be reverted back to its original form without any alteration in its chemical makeup.

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8. A mixture has non-uniform composition _______________

A mixture has non-uniform composition because it is made up of different substances that are not evenly distributed throughout. The components of a mixture can vary in their proportions and can be physically separated from each other. This results in different regions or parts of the mixture having different compositions, leading to a non-uniform distribution of the substances within the mixture.

Explanation

A mixture has non-uniform composition because it is made up of different substances that are not evenly distributed throughout. The components of a mixture can vary in their proportions and can be physically separated from each other. This results in different regions or parts of the mixture having different compositions, leading to a non-uniform distribution of the substances within the mixture.

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10. A solid takes shape of its container _______.

The given answer "F" is incorrect as a solid does not take the shape of its container. Solids have a fixed shape and volume, and they do not change their shape to fit the container they are placed in.

Explanation

The given answer "F" is incorrect as a solid does not take the shape of its container. Solids have a fixed shape and volume, and they do not change their shape to fit the container they are placed in.

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