Introduction into writing and balancing chemical equations

Open Ended

Explain how the use of coefficients in chemical equations helps in representing the law of conservation of mass.

Multiple Choice

Which indicator is used for a substance that is dissolved in water?

• g

• l

• cr

• aq

Multiple Choice

A + B → C + D. In this equation, what do A and B represent?

• Products

• Reactants

• Coefficients

• Catalysts

Multiple Choice

What does the coefficient in a chemical equation represent?

• The total number of atoms in a molecule

• The number of molecules or units involved in the reaction

• The type of chemical bond

• The charge of the molecule

Multiple Choice

Which of the following statements about subscripts in chemical equations is correct?

• Subscripts indicate the number of molecules involved in the reaction.

• Subscripts show the total number of individual atoms in a molecule or formula unit.

• Subscripts represent the charge of the molecule.

• Subscripts are used to balance chemical equations.

Multiple Choice

Which of the following is the correct balanced chemical equation for the reaction between aluminum and copper(II) chloride?

• 2Al(s) + 3CuCl2(aq) → 3Cu(s) + 2AlCl3(aq)

• Al + CuCl2 → Cu + AlCl3

• 2Al + 3CuCl2 → 2AlCl3 + 3Cu

• Al(s) + 2CuCl2(aq) → 2Cu(s) + AlCl3(aq)