6th Grade Science Summer School Pre-Test

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What is a chemical change?

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A chemical change is a process where one or more substances are transformed into new substances with different properties. Examples include burning wood, rusting iron, and baking a cake.

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What is a physical change?

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A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include melting ice, breaking glass, and dissolving sugar in water.

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What indicates that a chemical reaction has occurred?

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Signs of a chemical reaction include color change, temperature change, gas production (bubbles), and the formation of a precipitate.

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What happens to temperature during an exothermic reaction?

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In an exothermic reaction, the temperature of the surroundings increases because heat is released.

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What happens to temperature during an endothermic reaction?

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In an endothermic reaction, the temperature of the surroundings decreases because heat is absorbed.

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What is solubility?

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Solubility is the ability of a substance to dissolve in a solvent, such as water. It is often expressed in terms of concentration.

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What is a reactant?

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A reactant is a substance that undergoes a chemical change in a reaction. Reactants are found on the left side of a chemical equation.

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What is a product in a chemical reaction?

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A product is a substance that is formed as a result of a chemical reaction. Products are found on the right side of a chemical equation.

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What is the law of conservation of mass?

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The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; it is conserved.

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What is an example of a physical change?

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An example of a physical change is breaking a glass bottle. The glass is still glass, just in smaller pieces.