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Question #1

Question #1. The type of change that occurs when Al metal foil is added to a solution of copper (II) chloride forming a reddish solid is classified as a _____________ change. A) physical B) chemical C) emotional D) nuclear. Question #2.

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Question #1

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  1. Question #1 The type of change that occurs when Al metal foil is added to a solution of copper (II) chloride forming a reddish solid is classified as a _____________ change. A) physical B) chemical C) emotional D) nuclear.

  2. Question #2 To determine if a clear liquid (filtrate) that passes through filter paper contains any dissolved solids you should A) filter it again B) evaporate off the liquid C) decant the liquid D) shake it vigorously.

  3. Question #3 The best method to separate and recover only the solids that are still on the bottom of the beaker after adding water and warming the contents is by A) distillation B) evaporation C) stirring D) filtration.

  4. Question #4 The correct chemical formula for the compound sodium phosphate is A) Na3PO3 B) Na3P C) Na3PO4 D) NaPO4.

  5. Question #5 The correct name for the compound Pb(NO3)2 is A) lead (II) nitrate B) lead (II) nitrite C) lead (II) nitride D) lead (IV) nitrate.

  6. Question #6 When barium acetate reacts with potassium carbonate, the name of the new, solid compound formed is A) barium potassium B) barium carbonate C) potassium baritate D) boron acetate.

  7. Question #7 When AlCl3 reacts with KOH, the formula of the new solid compound formed is A) H3Al B) KCl3 C) Al(OH)3 D) AlKO2

  8. Question #8 The gas that is formed during the reaction of hydrochloric acid and zinc metal is A) oxygen B) water C) hydrogen D) chlorine

  9. Question #9 An example of a decomposition reaction is A) 4Fe+3O2 --> 2Fe2O3 B) Na2CO3 --> Na2O + CO2 C) CaCl2 + Na2CO3 --> CaCO3 + 2NaCl D) H2SO4 + Mg --> MgSO4 + H2

  10. Question #10 Subatomic particles in the nucleus include A) neutrons and protons B) neutrons and electrons C) ions and protons D) electrons and protons

  11. Question #11 When a solution of CaO is mixed with H2SO4, the formula of the new compound that precipitates is A) CaSO4 B) H2O C) H2S D) HCaO4

  12. Question #12 The correctly written equation for the burning of magnesium in air is: A) Mg + O2 --> MgO2 B) 4Mg + 3O2 --> 2Mg2O3 C) Mg + O --> MgO D) 2Mg + O2 --> 2MgO

  13. Question #13 The average kinetic energy of water molecules in ice at 0C compared to water molecules in steam at 100C is: A) the same B) lower C) higher D) impossible to determine.

  14. Question #14 When the equation shown below, AlCl3 + Ca(OH)2 ---> CaCl2 + Al(OH)3 is correctly balanced, the sum of all of the coefficients is A) 4 B) 6 C) 10 D) 14.

  15. Problem #15 If the water temperature in a lab increases from 20.ºC to 80.ºC , then the reaction must be A) ionthermic B) nonthermic C) endothermic D) exothermic

  16. Problem #16 From the following list, the element which gains electrons is A) Na B) Cu C) F D) Pb

  17. Problem #17 When 5.00 g of popcorn is heated in the microwave, the mass of the kernels after popping is 4.00 g. This means the percent of water by mass in popcorn is A) 20.0% B) 53.3% C) 62.5% D) 75.0%

  18. Problem #18 Data: mass of empty cylinder = 61.73g mass of cylinder & 50.0 mL water = 111.41g Based on the above data, the density of the water is A) 0.994 g/mL B) 1.00 g/mL C) 1.24 g/mL D) 2.23 g/mL

  19. Problem #19 If MgSO4•7H2O is gently heated is is expected that the following gaseous compound will be released A) H2O B) MgS C) SO4 D) MgO

  20. Problem #20 65,000 Joules of heat energy being absorbed is both A) exothermic and 65 kJ B) endothermic and 65 kJ C) exothermic and 65,000,000 kJ D) endothermic and 65,000,000 kJ

  21. Problem #21 All of the following are evidence of a chemical reaction except: A) precipitation B) color changing C) gas evolution D) dissolving

  22. Problem #22 When the equation shown below, H2 + O2 ---> H2O is correctly balanced, the sum of all of the coefficients is A) 3 B) 5 C) 6 D) 12.

  23. Problem #23 Which set consists only of compounds? A) Ba, Na, Ar B) H2O, SiH4 , H2 C) NH4+, Br-, O2- D) Li2O, CuI2 , NaOH

  24. Problem #24 The oxidation number of phosphorus in PO23- is A) 1+ B) 3+ C) 5+ D) 8+

  25. Problem #25 The gas used to kill bacteria and is an effective bleaching agent is A) chlorine B) hydrogen C) oxygen D) carbon dioxide

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