Chemical Reactions

Front

What is a Coefficient in a chemical formula?

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A coefficient is a number placed in front of a chemical formula to indicate how many molecules of that substance are present.

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What does a balanced chemical equation represent?

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A balanced chemical equation shows that the number of atoms of each element is the same on both sides of the equation, indicating that mass is conserved.

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What does the Law of Conservation of Mass state?

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The Law of Conservation of Mass states that matter cannot be created or destroyed; the mass of the products must equal the mass of the reactants.

Front

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 getting a haircut.

Front

What is a chemical change?

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A chemical change is a change that results in the formation of new chemical substances, such as a copper penny turning green due to oxidation.

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What is an Atom?

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An atom is the smallest unit of an element that retains the properties of that element.

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What is a Molecule?

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A molecule is a group of two or more atoms bonded together, representing the smallest fundamental unit of a chemical compound.

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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.

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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.

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What is Oxidation?

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Oxidation is a chemical reaction that involves the loss of electrons or an increase in oxidation state by a molecule, atom, or ion.