Chemistry Review

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What is a coefficient in a chemical equation?

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A coefficient is a number placed in front of a chemical formula to indicate how many molecules or moles of that substance are involved in the reaction.

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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 different substances with different properties, such as iron rusting.

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Where are the most reactive elements located on the periodic table?

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The most reactive elements are located on the left side of the periodic table, particularly in Group 1 (alkali metals).

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What is the law of conservation of mass?

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The law of conservation of mass states that in a closed system, the mass of the reactants is equal to the mass of the products in a chemical reaction.

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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, such as breaking a mirror.

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What is an example of a chemical change?

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An example of a chemical change is iron rusting, where iron reacts with oxygen to form iron oxide.

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What is the difference between a physical change and a chemical change?

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A physical change does not change the substance's chemical identity, while a chemical change results in the formation of new substances.

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What are reactants in a chemical reaction?

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Reactants are the starting substances that undergo a chemical change in a reaction.

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What are products in a chemical reaction?

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Products are the substances that are formed as a result of a chemical reaction.

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What is the significance of balancing chemical equations?

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Balancing chemical equations ensures that the law of conservation of mass is obeyed, meaning the number of atoms of each element is the same on both sides of the equation.