7th Advanced Quarter 2 Summative Exam Review

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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, freezing, and boiling.

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What is a chemical change?

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A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and the breaking and forming of bonds. Examples include rusting and toasting bread.

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What are reactants in a chemical equation?

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Reactants are the starting substances in a chemical reaction, found on the left side of the equation. They undergo a change to form products.

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What are products in a chemical equation?

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Products are the substances formed as a result of a chemical reaction, found on the right side of the equation.

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What does the arrow in a chemical equation represent?

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The arrow in a chemical equation represents the direction of the reaction, indicating that reactants are transformed into products.

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How do you identify the number of atoms in a chemical formula?

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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. The total mass of reactants equals the total mass of products.

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What is the difference between an endothermic and exothermic reaction?

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An endothermic reaction absorbs energy (heat) from its surroundings, while an exothermic reaction releases energy (heat) to its surroundings.

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What is a balanced chemical equation?

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A balanced chemical equation has the same number of each type of atom on both sides of the equation, ensuring the law of conservation of mass is followed.

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What is the significance of coefficients in a chemical equation?

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Coefficients indicate the number of molecules or moles of a substance involved in a reaction. They are used to balance chemical equations.