Grade 9 Chemistry

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What is an element?

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An element is a pure substance that cannot be broken down into simpler substances by chemical means. It consists of only one type of atom.

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What is a chemical change?

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A chemical change is a process where substances combine or break apart to form new substances with different properties. Example: Copper metal turning green.

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What is a mixture?

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A mixture is a combination of two or more substances that retain their individual properties. Examples include air, salad, and saltwater.

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What is a compound?

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A compound is a substance formed when two or more elements chemically bond together in fixed proportions. Example: Water (H2O) is a compound made of hydrogen and oxygen.

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What does ductile mean?

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Ductile refers to a material's ability to be stretched into a wire without breaking. Example: Copper is ductile.

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What does malleable mean?

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Malleable refers to a material's ability to be hammered or pressed into thin sheets without breaking. Example: Gold is malleable.

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What is filtration?

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Filtration is a separation technique used to separate solids from liquids or gases using a filter. Example: Using a coffee filter to separate coffee grounds from liquid.

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What is evaporation?

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Evaporation is the process where liquid turns into vapor, usually when heated. Example: Water evaporating from a puddle on a sunny day.

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What is a solution?

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A solution is a homogeneous mixture where one substance (solute) is dissolved in another (solvent). Example: Saltwater is a solution of salt in water.

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What is a colloid?

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A colloid is a mixture where tiny particles of one substance are evenly distributed throughout another substance. Example: Milk is a colloid.