chem quiz 9 ch 7 – Flashcards

When a solution of MgCl2 and one of AgNO3 are mixed, the net ionic equation is: Select one: a. Mg2+(aq) + 2Cl-(aq) + 2Ag+(aq) + 2NO3- (aq) → Mg(NO3)2 (aq) + 2 AgCl(s) b. Cl-(aq) + Ag+(aq) → AgCl(s) c. Mg2+(aq) + 2NO3-(aq) → Mg(NO3)2(aq) d. Mg2+(aq) + 2Cl-(aq) + 2Ag+(aq) + 2NO3- (aq) → Mg2+(aq) + 2NO3-(aq) + 2AgCl(s) e. no reaction

What are the coefficients for the following reaction when it is properly balanced? ___nitric acid + ___sodium hydroxide → ___sodium nitrate + ___water Select one: a. 1, 1, 1, 1 b. 5, 2, 2, 1 c. 2, 1, 1, 1 d. 2, 3, 2, 2

A reaction which forms a solid product is an example of a(n)________. Select one: a. gas evolution reaction b. none of these choices c. combustion reaction d. oxidation-reduction reaction e. precipitation reaction

A redox reaction has occurred ________. Select one: a. when an alkali metal reacts with an alkaline earth metal b. when any of these choices occur c. when a substance reacts with elemental oxygen d. when one substance forms a solid e. when one substance transfers protons to another

What is the complete ionic equation for the reaction of hydrochloric acid with potassium hydroxide? Select one: a. H+ + Cl- + K+ + OH- → 2H+ + O2- + K+ + Cl- b. H+ + Cl- + K+ + OH- → H2O + K+ + Cl- c. 2H+ +2Cl- + K2+ + 2OH- → H2O + K2+ +2 Cl- d. H+ + OH- → H2O

Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3 What is the correct complete ionic equation? Select one: a. Pb2+ + 2NO3- +2K+ + I- → PbI2(s) + 2K+ + 2NO3- b. Pb2+ + 2NO3- +2K+ + 2I- → PbI2(s) + 2K+ + 2NO3- c. Pb2+ + 2NO3- + 2K+ + I- → Pb2+ + 2I- + 2K+ + 2NO3- d. Pb2+ + (NO3)2- + 2K+ + 2I- → PbI2(s) + 2K+ + 2NO3- e. Pb2+ + 2NO3- +2K+ + I- → PbI2(s) + 2K+ + NO3-

The reaction CH4 (g) + 2 O2 (g) → CO2 (g) + 2 H2O (g) is: 1. a combustion reaction 2. a redox reaction 3. an exothermic reaction Select one: a. 2 and 3 only b. 1 and 2 only c. 1 and 3 only d. None of 1, 2, and 3 e. All of 1, 2, and 3

Which is a spectator ion from the following complete ionic equation: Ag+(aq) + NO3-(aq) + K+ (aq) + Br-(aq) → AgBr(s) + K+(aq) + NO3- (aq) Select one: a. Br- b. AgBr c. Ag+ d. K+

Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3 Which ion(s) would NOT be present in the net ionic equation? Select one: a. K+, I- b. K+, Pb2+ c. Pb2+, NO3- d. K+, NO3- e. All the above ions are in the net ionic equation.

When the equation __Ca3N2 + __H2O → __Ca(OH)2 + __NH3 is balanced, the coefficient of H2O is: Select one: a. 6 b. 2 c. 12 d. 3

What are the coefficients for the following reaction when it is properly balanced? ___HCl + ___Mg → ___MgCl2 + ___ H2 Select one: a. 2, 1, 1, 1 b. 2, 1, 2, 2 c. 1, 1, 1, 2 d. 1, 2, 1/2, 1

What is the molecular equation for the reaction of hydrochloric acid with potassium hydroxide? Select one: a. H2Cl + 2KOH → H2O +2KCl b. H+ + OH- → H2O c. 2HCl + K(OH)2 → 2H2O + KCl2 d. HCl + KOH → H2O + KCl

A reaction which forms a gaseous product is an example of a(n)________. Select one: a. oxidation-reduction reaction b. combustion reaction c. gas evolution reaction d. none of these choices e. precipitation reaction

When water is heated, bubbles form in the water. Is this evidence of a chemical reaction? Why? Select one: a. Yes, the formation of a gas is evidence of a chemical reaction. b. none of these choices c. No, the formation of gas bubbles is a secondary chemical reaction which is ignored. d. Yes, the formation of a gas is proof a new compound has been made. e. No, boiling water is a physical change.

Which of the following statements about balancing reactions is FALSE? Select one: a. All of these statements are true. b. When coefficients are added the type of compounds is changed in the chemical reaction. c. Subscripts are multiplied by the coefficients to determine the number of atoms in a compound. d. Coefficients are added to compounds to ensure both sides of the reaction have equal numbers of each atom. e. If there is no coefficient or subscript, a one is implied.

What is the net ionic equation for the reaction of hydrochloric acid with potassium hydroxide? Select one: a. H+ + Cl- + K+ + OH- → H2O + K+ + Cl- b. H+ + OH- → H2O c. HCl + KOH → H2O + KCl d. 2H+ +2Cl- + K2+ + 2OH- → H2O + K2+ +2 Cl-

In writing the chemical equation for a precipitation reaction, what abbreviation of the physical state must appear with one of the products? Select one: a. (w) b. (s) c. (g) d. (l)

Which of the following compounds is SOLUBLE? Select one: a. aluminum sulfate b. all are insoluble c. aluminum sulfide d. aluminum hydroxide e. aluminum carbonate

The compound sodium sulfate is soluble in water. When this compound dissolves in water, which ion listed below would be present in solution? Select one: a. Na22+ b. S2- c. SO42- d. O2-

A precipitate is expected to be formed when an aqueous solution of sodium sulfate is added to an aqueous solution of Select one: a. none of these would produce a precipitate b. iron(III) chloride. c. magnesium chloride. d. barium chloride. e. potassium chloride.