Ch 7 Chemical Reactions Study Guide Accelerated Chemistry SCANTRON

Name______/80

TRUE/FALSE. Write 'T' if the statement is true and 'F' if the statement is false. Correct the False statments by changing the underlined word(s).

1) The following equation IS balanced: CH4 + 2O2 CO2 + H2O 1)

2) A strong electrolyte solution contains ionic compounds that completely dissociate in water. 2)

3) When compounds containing polyatomic ions dissolve, the polyatomic ions usually dissolve 3) as intact units.

4) A net ionic equation shows all ionic species that are present in solution. 4)

5) Combustion reactions emit heat and so can be classified as endothermic. 5)

6) Mixing HNO3 (aq) and NaHCO3 (aq) will produce carbon dioxide gas as a product. 6)

7) When balancing a chemical equation you may alter the coefficients but not the subscripts in 7) the equation.

8) An acid-base reaction always produces a salt plus carbon dioxide. 8)

9) The formation of either a solid or a gas is evidence of a chemical reaction. 9)

10) Decomposition reactions usually require energy to initiate the reaction. 10)

11) Li+, Na+, K+ and NH4+ compounds are soluble. 11)

12) The reaction of carbonate ion with magnesium ion to form solid magnesium carbonate is an 12) example of an oxidation reduction reaction.

13) Evidence of a redox reaction is when one substance transfers protons to another substance. 13)

14) The following equation IS balanced: 2 C4H10O + 13 O2 8 CO2 + 10 H2O 14)

15) The reaction of baking soda and vinegar to produce carbon dioxide gas is an example of a 15) precipitation reaction.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

16) A reaction which forms a gaseous product is an example of a(n)______. 16) A) oxidation-reduction reaction B) combustion reaction C) gas evolution reaction D) precipitation reaction

1 17) A reaction which forms a solid product is an example of a(n)______. 17) A) gas evolution reaction B) combustion reaction C) oxidation-reduction reaction D) precipitation reaction

18) A reaction in which a substance reacts with oxygen, emitting heat and forming 18) oxygen-containing compounds is an example of a(n) A) gas evolution reaction. B) acid-base reaction. C) combustion reaction. D) precipitation reaction.

19) Which of the following is NOT evidence that a chemical reaction has occurred? 19) A) solid formation when chemicals are contacted with each other B) emission of light when chemicals are contact with each other C) gas formation when chemicals are contacted with each other D) All of the above are evidence of a chemical reaction.

20) Which of the following is NOT a sign of a chemical reaction? 20) A) absorbing heat when chemicals are contacted with each other B) emission of heat when chemicals are contacted with each other C) absorbing light when chemicals are contacted with each other D) emission of light when chemicals are contacted with each other

21) When water is heated, bubbles form in the water. Is this evidence of a chemical reaction? 21) Why? A) No, boiling water is a physical change. B) No, the formation of gas bubbles is a secondary chemical reaction which is ignored. C) Yes, the formation of a gas is evidence of a chemical reaction. D) Yes, the formation of a gas is proof a new compound has been made.

22) Which of the following statements about balancing reactions is FALSE? 22) A) Subscripts are multiplied by the coefficients to determine the number of atoms in a compound. B) If there is no coefficient or subscript, a one is implied. C) Coefficients are added to compounds to ensure both sides of the reaction have equal numbers of each atom. D) When coefficients are added the type of compounds is changed in the chemical reaction.

23) Before a chemical equation can be written, one must know 23) A) the number of moles of all reactants and products. B) the molar mass of all the compounds. C) the symbols and formulas of all reactants and products. D) none of the above.

24) When the equation, ___N2 + ___H2 ___NH3 is balanced, the coefficient of hydrogen is: 24) A) 4 B) 1 C) 2 D) 3

25) When the equation, ___O2 + ___C5H12 ___CO2 + ___H2O is balanced, the coefficient: 25) of O2 is: A) 8 B) 5 C) 4 D) 3

2 26) What are the coefficients for the following reaction when it is properly balanced? 26)

___HCl + ___Mg ___MgCl2 + ___ H2

A) 1, 1, 1, 2 B) 2, 1, 1, 1 C) 2, 1, 2, 2 D) 1, 2, 1/2, 1

27) What are the coefficients for the following reaction when it is properly balanced? 27)

___O2 + ___CH4 ___CO2 + ___H2O

A) 2, 3, 2, 2 B) 1, 3, 2, 1 C) 2, 1, 1, 2 D) 2, 1, 3, 1

28) What are the coefficients for the following reaction when it is properly balanced? 28)

___Na3PO4 + ___Ba(NO3)2 ___NaNO3 + ___Ba3(PO4)2

A) 2, 3, 6, 1 B) 2, 1, 1, 3 C) 6, 1, 3, 2 D) 2, 3, 1, 6

29) What are the coefficients for the following reaction when it is properly balanced? 29)

___nitric acid + ___sodium hydroxide ___sodium nitrate + ___water

A) 2, 1, 1, 1 B) 5, 2, 2, 1 C) 1, 1, 1, 1 D) 2, 3, 2, 2

30) What are the coefficients for the following reaction when it is properly balanced? 30)

___potassium iodide + ___lead (II) acetate ___lead (II) iodide +___potassium acetate

A) 3, 2, 2, 1 B) 1, 1, 2, 2 C) 2, 1, 1, 2 D) 2, 1, 1, 1

31) What are the coefficients for the following reaction when it is properly balanced? 31)

___nitrogen monoxide + ___carbon monoxide ___nitrogen +___carbon dioxide

A) 1, 1, 2, 2 B) 2, 2, 1, 2 C) 2, 1, 1, 2 D) 2, 2, 2, 1

32) When the equation __Ca3N2 + __H2O __Ca(OH)2 + __NH3 is balanced, the coefficient of 32) H2O is: A) 3 B) 12 C) 6 D) 2

33) When the equation __NO2 + __H2O + __O2 __HNO3 is balanced, the coefficient of HNO3 33) is A) 2. B) 4. C) 3. D) 5.

3 34) Which of the following equations is NOT balanced properly? 34) A) Cr2(SO4)3 + 6KOH 2Cr(OH)3 + 3 K2SO4 B) 2NaHCO3 Na2CO3 + CO2 + H2O C) 4NH3 + 14O2 4NO2 + 6H2O D) 2Cr + 6HCl 2CrCl3 + 3H2

35) Sodium metal reacts with water to form aqueous sodium hydroxide and hydrogen gas. Which 35) equation below best describes the balanced equation for this reaction? A) 2Na + 2H2O 2NaOH (aq) + H2 (g) B) Na + H2O NaOH (aq) + H (g) C) Na + H2O NaOH (aq) + H2 (g) D) 2Na + H2O Na2OH (aq) + H (g)

36) An aqueous solution is: 36) A) water with another compound dissolved in it. B) water with a molecular compound dissolved in it. C) an ionic compound with water dissolved in it. D) any liquid with another compound dissolved in it.

37) Which of the following compounds is INSOLUBLE? 37) A) lithium carbonate B) aluminum sulfide C) magnesium bromide D) potassium acetate

38) Which of the following compounds is INSOLUBLE? 38) A) magnesium sulfate B) magnesium nitrate C) magnesium phosphate D) magnesium iodide

39) Which of the following compounds is SOLUBLE? 39) A) copper carbonate B) calcium carbonate C) strontium carbonate D) potassium carbonate

40) Which of the following compounds is SOLUBLE? 40) A) aluminum sulfate B) aluminum sulfide C) aluminum carbonate D) none of the above

41) All of the following compounds are soluble in water EXCEPT 41) A) CaCl2. B) PbCl2. C) FeCl3. D) NH4Cl.

42) The compound sodium sulfate is soluble in water. When this compound dissolves in water, 42) which ion listed below would be present in solution? A) S2- B) O2- C) SO42- D) Na22+

43) When solid NaCl is stirred into water, which of the following is NOT true? 43) A) The solution will conduct electricity. B) The solution will taste salty. C) The NaCl will fail to dissociate. D) none of the above

44) If you had an aqueous mixture that contained Ag+, K+, and Pb+2 cations, how many different 44) solids could precipitate if a chloride solution was added? A) 1 B) 2 C) 4 D) 3

4 45) In writing the chemical equation for a precipitation reaction, what abbreviation of the physical 45) state must appear with one of the products? A) (l) B) (w) C) (g) D) (s)

46) What type of a reaction occurs when a potassium nitrate solution is mixed with a barium 46) acetate solution? A) precipitation B) oxidation-reduction C) gas evolution D) no reaction

47) A precipitate is expected to be formed when an aqueous solution of sodium sulfate is added to 47) an aqueous solution of A) potassium chloride. B) iron(III) chloride. C) magnesium chloride. D) barium chloride.

48) What would be the formula of the precipitate that forms when Pb(NO3)2 (aq) and K2SO4 (aq) 48) are mixed? A) PbSO4 B) K(NO3)2 C) PbK2 D) none of the above

49) Considering the following precipitation reaction: 49)