Test: Chemical Reactions

18 Questions | By Songj2 | Last updated: Jan 9, 2013 | Total Attempts: 180

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Review for unit test.

Questions and Answers

1.

Which of the following is an example of a synthesis reaction?
- A.
  
  Heating calcium carbonate strongly
- B.
  
  Putting sodium into water to produce hydrogen gas and sodium hydroxide
- C.
  
  Passing electricity through water
- D.
  
  Heating mercuric oxide
- E.
  
  Putting copper into oxygen to produce copper (II) oxide
2.

A double displacement chemical reaction is the
- A.
  
  Exchange of two different atoms between two compounds.
- B.
  
  Displacement of one element in a compound by another element.
- C.
  
  Breaking up of a compound to produce two different elements.
- D.
  
  Joining together of two elements to form a compound.
- E.
  
  Absorption of heat in a chemical reaction.
3.

An acid-base indicator is a substance that
- A.
  
  Does not change colour when the pH of the test solution goes from 4 to 9.
- B.
  
  Is always red in acid and green in base.
- C.
  
  Is rare and can only be obtained as a specialized chemical.
- D.
  
  Turns different colours in acids and bases.
- E.
  
  Does none of these.
4.

The following list contains properties of common acids and bases in water. Which of these properties describe a base? 1. turns litmus blue 2. becomes clear/cloudy in phenolphthalein 3. feels slippery 4. tastes sour 5. reacts with chalk (calcium carbonate).
- A.
  
  1 and 3 only
- B.
  
  1, 2, 3, 4, and 5
- C.
  
  1, 4, and 5 only
- D.
  
  2 and 5 only
- E.
  
  3 and 4 only
5.

An acid with a pH of 3 is _____ times more acidic than an acid with a pH of 5.
- A.
  
  Two
- B.
  
  Ten
- C.
  
  One hundred
- D.
  
  One thousand
- E.
  
  Ten thousand
6.

Which of the following are correct concerning neutralization reactions? Neutralization reactions 1. produce water. 2. produce a salt. 3. are single displacement reactions. 4. have an acid and a base as reactants. 5. are synthesis reactions.
- A.
  
  2, 4, and 5 only
- B.
  
  1, 4, and 5 only
- C.
  
  2, 3, and 4 only
- D.
  
  1, 2, and 3 only
- E.
  
  1, 2, and 4 only
7.

Which reaction among the following is NOT a neutralization?
- A.
  
  H2SO4 + Ca(OH)2 --> CaSO4 + 2 H2O
- B.
  
  Zn + 2 HCl --> ZnCl2 + H2
- C.
  
  KOH + HCl --> KCl + H2O
- D.
  
  HNO3 + NaOH --> H2O + NaNO3
- E.
  
  2 Al(OH)3 +3 H2SO4 --> Al2(SO4)3 + 6 H2O
8.

XF₂ is the formula of a metallic fluoride. The formula of the corresponding metallic oxide of X is
- A.
  
  XO.
- B.
  
  XO2.
- C.
  
  XO4.
- D.
  
  X2O.
- E.
  
  X2O3.
9.

Which of the following polyatomic ions have names that end in "ate"? 1. ClO₃^- 2. OH^- 3. PO₄^3- 4. HCO₃^2- 5. SO₃^2-
- A.
  
  2, 3, and 4 only
- B.
  
  2, 3, and 5 only
- C.
  
  1 and 5 only
- D.
  
  1, 3, and 4 only
- E.
  
  1, 2, 4, and 5 only
10.

When the following equation (for the production of rust) is balanced, the coefficients for Fe(OH)₂ and O₂ in order are: Fe(OH)₂ + O₂ + H₂O ® Fe(OH)₃
- A.
  
  3, 2
- B.
  
  4, 1
- C.
  
  2, 3
- D.
  
  2, 2
- E.
  
  1, 4
11.

Which of the following metals would displace aluminum in aluminum nitrate?i) copperii) goldiii) magnesiumiv) ironv) calcium
- A.
  
  I, ii and v only
- B.
  
  Ii, iv and v only
- C.
  
  Iii and v only
- D.
  
  I and iii only
- E.
  
  V only
12.

This acid is responsible for the pain felt from a stinging insect.
- A.
  
  Formic acid
- B.
  
  Sulfuric acid
- C.
  
  Nitric acid
- D.
  
  Acetylsalicylic acid
- E.
  
  Citric acid
13.

Which of the following observations positively identifies an acid?
- A.
  
  Solution turn pink in phenolphthalein
- B.
  
  Red litmus paper stays red
- C.
  
  The substance feels slippery
- D.
  
  Blue litmus paper turns blue
- E.
  
  Oxygen gas is produced when a metal is added
14.

Which of the following is a physical change?
- A.
  
  Silver tarnishing
- B.
  
  Muffins baking
- C.
  
  Fireworks igniting
- D.
  
  Snow melting
- E.
  
  Sodium chloride dissolved in water
15.

The reaction of solutions of ammonium phosphate and barium nitrate gives a precipitate of barium phosphate. The equation which best represents this statement is:
- A.
  
  2(NH4)3PO4(s) + 3Ba(NO3)2(aq) --> Ba3(PO4)2(aq) + 6NH4NO3(s)
- B.
  
  2(NH4)3PO4(aq) + 3Ba(NO3)2(aq) --> Ba3(PO4)2(s) + 6NH4NO3(aq)
- C.
  
  2(NH4)3PO4(aq) + 3Ba(NO3)2(s) --> Ba3(PO4)2(s) + 6NH4NO3(aq)
- D.
  
  2(NH4)3PO4(aq) + 3Ba(NO3)2(aq) --> Ba3(PO4)2(aq) + 6NH4NO3(aq)
16.

The major cause of acid precipitation from car exhaust is:
- A.
  
  Hydrogen gas
- B.
  
  Sulfur dioxides
- C.
  
  Nitrogen oxides
- D.
  
  Carbon monoxide
- E.
  
  Carbon dioxide
17.

When a piece of Al is immersed in a solution of CuCl₂, the result is
- A.
  
  AlCl3 and CuCl2
- B.
  
  Al(s) Cu(s) and Cl2(g)
- C.
  
  AlCl3 and Cu(s)
- D.
  
  CuCl2 and Al2
- E.
  
  No reaction
18.

How many atoms of oxygen in 3 molecules of aluminum phosphate?
- A.
  
  1
- B.
  
  2
- C.
  
  3
- D.
  
  4
- E.
  
  12