Chemistry Final Exam Review

Knowledge about what products are produced in a chemical reaction is obtained by

• inspecting the chemical equation.

• balancing the chemical equation.

• laboratory analysis.

• writing a word equation.

A solid produced by a chemical reaction in solution that separates from the solution is called

• a precipitate.

• a reactant.

• a molecule.

• the mass of the product.

After the correct formula for a reactant in an equation has been written, the

• subscripts are adjusted to balance the equation.

• formula should not be changed.

• same formula must appear as the product.

• symbols in the formula must not appear on the product side of the equation.

Tags

NGSS.HS-PS1-7

In writing an equation that produces hydrogen gas, the correct representation of hydrogen gas is

• H.

• 2H.

• H₂.

• OH.

According to the law of conservation of mass, the total mass of the reacting substances is

• always more than the total mass of the products.

• always less than the total mass of the products.

• sometimes more and sometimes less than the total mass of the products.

• always equal to the total mass of the products.

Tags

NGSS.HS-PS1-7

A chemical equation is balanced when the

• coefficients of the reactants equal the coefficients of the products.

• same number of each kind of atom appears in the reactants and in the products.

• products and reactants are the same chemicals.

• subscripts of the reactants equal the subscripts of the products.

Tags

NGSS.HS-PS1-7

Which coefficients correctly balance the formula equation NH₄NO₂(s) → N₂(g) + H₂O(l)?

• 1, 2, 2

• 1, 1, 2

• 2, 1, 1

• 2, 2, 2

The equation AX → A + X is the general equation for a

• synthesis reaction.

• decomposition reaction.

• combustion reaction.

• single-replacement reaction.

The reaction 2HgO(s) → 2Hg(l) + O₂(g) is a(n)

• single-replacement reaction.

• synthesis reaction.

• ionic reaction.

• decomposition reaction.

Group 1 metals react with water to produce metal hydroxides and

• metal hydroxides.

• hydrochloric acid.

• oxygen.

• hydrogen.

Tags

NGSS.HS-PS1-1