Chemical Equations Quiz

The general format of a chemical equation is:

• Reactants ← Products

• Products → Reactants

• Reactants → Products

• Reactants = Products

The arrow (→) in a chemical equation can be read as:

• Equals

• “Produces” or “Forms”

• Combines with

• Multiplies

Reactants in a chemical reaction are:

• Substances formed after the reaction

• Substances that start the reaction

• The same as products

• Always gases

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The Law of Conservation of Mass states that matter cannot be:

• Rearranged or changed

• Measured or calculated

• Created or destroyed

• Balanced

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NGSS.MS-PS1-5

Atoms can be (a)   during a chemical reaction.

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A balanced chemical equation ensures:

• Equal coefficients on both sides

• The same number of each type of atom on both sides

• Subscripts are equal on both sides

• Products and reactants are identical

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NGSS.MS-PS1-5

To balance a chemical equation, you can only change:

• Subscripts

• Coefficients

• Reactants

• Products

Changing a subscript in a chemical formula would:

• Make balancing easier

• Change the substance

• Double the atoms

• Have no effect

Coefficients in a chemical equation indicate:

• The type of chemical bond

• The number of molecules or units of a substance

• The number of atoms in one molecule

• The speed of the reaction

To calculate the total number of atoms of an element in a molecule:

• Add the coefficients and subscripts

• Divide the coefficient by the subscript

• Multiply the coefficient by the subscript

• Subtract the subscript from the coefficient

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