Chemical Formulas and Reactions

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What is a chemical formula?

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A chemical formula is a way of expressing the elements in a compound and the number of atoms of each element.

Front

What does a subscript in a chemical formula indicate?

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A subscript indicates the number of atoms of the element that are present in the molecule.

Front

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.

Front

How do you determine if a chemical equation is balanced?

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A chemical equation is balanced when the number of atoms of each element is the same on both sides of the equation.

Front

What is the purpose of a chemical reaction?

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The purpose of a chemical reaction is to transform reactants into products through the breaking and forming of chemical bonds.

Front

What does the term 'reactants' refer to in a chemical equation?

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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 the atomic number in a chemical formula?

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The atomic number indicates the number of protons in an atom, which determines the element's identity.

Front

How many total atoms are in the formula 2H2O?

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There are 6 total atoms in the formula 2H2O (2 hydrogen atoms and 1 oxygen atom per molecule, multiplied by 2).

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What does the chemical symbol 'Cu' represent?

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The chemical symbol 'Cu' represents the element Copper.