HOMS Review: Changes in Matter

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What is a compound?

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A compound is a substance formed when two or more elements are chemically bonded together. For example, water (H2O) is a compound made of hydrogen and oxygen.

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What is the difference between an element and a compound?

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An element is a pure substance that cannot be broken down into simpler substances, while a compound is made up of two or more elements that are chemically combined.

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What is a mixture?

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A mixture is a combination of two or more substances that are not chemically bonded. The individual components retain their own properties.

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What is a homogeneous mixture?

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A homogeneous mixture is a mixture that has a uniform composition throughout, such as saltwater.

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What is a heterogeneous mixture?

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A heterogeneous mixture is a mixture where the components are not uniform and can be easily distinguished, such as a salad.

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What is a reactant in a chemical reaction?

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A reactant is a substance that undergoes change during a chemical reaction. For example, in the reaction of acetic acid and baking soda, both are reactants.

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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. For example, carbon dioxide and water are products of the reaction between acetic acid and baking soda.

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How do you balance a chemical equation?

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To balance a chemical equation, you adjust the coefficients of the reactants and products so that the number of atoms of each element is the same on both sides of the 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 a chemical formula?

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A chemical formula is a way of expressing the composition of a compound using symbols for the elements and numbers to indicate the ratio of atoms.