7th Grade Science Review

What is an element?

• A substance that cannot be broken down into simpler substances by chemical means.

• A substance that can be broken down into simpler substances by physical means.

• A substance that is composed of only one type of atom.

• A substance that can be broken down into simpler substances by chemical means.

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112.25.

Give an example of an element.

• Oxygen

• Hydrogen

• Carbon

• Nitrogen

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What is a compound?

• A compound is a substance formed by the physical combination of two or more elements.

• A compound is a substance formed by the chemical combination of two or more elements in random proportions.

• A compound is a substance formed by the chemical combination of two or more elements in indefinite proportions.

• A compound is a substance formed by the chemical combination of two or more elements in definite proportions.

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112.25.

Provide an example of a compound.

• water

• fire

• air

• rock

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Define physical change.

• A physical change is a change in which the substance's physical properties remain the same.

• A physical change is a change in which the substance's chemical composition is altered.

• A physical change is a change in which the substance's physical properties are altered, and its chemical composition remains the same.

• A physical change is a change in which the substance's physical properties, such as shape, size, or state of matter, are altered, but its chemical composition remains the same.

Tags

112.25.

Give an example of a physical change.

• Melting ice

• Mixing salt and water

• Burning wood

• Boiling water

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What is a chemical change?

• A chemical change is a process that results in the formation of new substances with opposite properties from the original substances.

• A chemical change is a process that results in the formation of new substances with no properties.

• A chemical change is a process that results in the formation of new substances with different properties from the original substances.

• A chemical change is a process that results in the formation of new substances with the same properties as the original substances.

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112.25.

Provide an example of a chemical change.

• Cutting a piece of paper

• Mixing of salt and water

• Burning of wood

• Melting of ice

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112.25.

What is an aqueous solution?

• A solution where water is the solvent.

• A solution where water is the solute.

• A type of mathematical equation.

• A temporary fix that does not fully solve the problem.

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112.25.

What are the two parts of an aqueous solution?

• Solute

• Solvent

• solution

• radiation

Tags

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