Test: Chemical Reactions

1. Which of the following is an example of a synthesis reaction?

Heating calcium carbonate strongly

Putting sodium into water to produce hydrogen gas and sodium hydroxide

Passing electricity through water

Heating mercuric oxide

Putting copper into oxygen to produce copper (II) oxide

2. A double displacement chemical reaction is the

Exchange of two different atoms between two compounds.

Displacement of one element in a compound by another element.

Breaking up of a compound to produce two different elements.

Joining together of two elements to form a compound.

Absorption of heat in a chemical reaction.

3. Which reaction among the following is NOT a neutralization?

H2SO4 + Ca(OH)2 --> CaSO4 + 2 H2O

Zn + 2 HCl --> ZnCl2 + H2

KOH + HCl --> KCl + H2O

HNO3 + NaOH --> H2O + NaNO3

2 Al(OH)3 +3 H2SO4 --> Al2(SO4)3 + 6 H2O

4. When a piece of Al is immersed in a solution of CuCl₂, the result is

AlCl3 and CuCl2

Al(s) Cu(s) and Cl2(g)

AlCl3 and Cu(s)

CuCl2 and Al2

No reaction

5. Which of the following is a physical change?

Silver tarnishing

Muffins baking

Fireworks igniting

Snow melting

Sodium chloride dissolved in water

6. 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-

2, 3, and 4 only

2, 3, and 5 only

1 and 5 only

1, 3, and 4 only

1, 2, 4, and 5 only

7. An acid-base indicator is a substance that

Does not change colour when the pH of the test solution goes from 4 to 9.

Is always red in acid and green in base.

Is rare and can only be obtained as a specialized chemical.

Turns different colours in acids and bases.

Does none of these.

8. An acid with a pH of 3 is _____ times more acidic than an acid with a pH of 5.

Two

Ten

One hundred

One thousand

Ten thousand

9. 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.

2, 4, and 5 only

1, 4, and 5 only

2, 3, and 4 only

1, 2, and 3 only

1, 2, and 4 only

10. The reaction of solutions of ammonium phosphate and barium nitrate gives a precipitate of barium phosphate. The equation which best represents this statement is:

2(NH4)3PO4(s) + 3Ba(NO3)2(aq) --> Ba3(PO4)2(aq) + 6NH4NO3(s)

2(NH4)3PO4(aq) + 3Ba(NO3)2(aq) --> Ba3(PO4)2(s) + 6NH4NO3(aq)

2(NH4)3PO4(aq) + 3Ba(NO3)2(s) --> Ba3(PO4)2(s) + 6NH4NO3(aq)

2(NH4)3PO4(aq) + 3Ba(NO3)2(aq) --> Ba3(PO4)2(aq) + 6NH4NO3(aq)

11. 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).

1 and 3 only

1, 2, 3, 4, and 5

1, 4, and 5 only

2 and 5 only

3 and 4 only

12. 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

3, 2

4, 1

2, 3

2, 2

1, 4

13. Which of the following metals would displace aluminum in aluminum nitrate?
i) copper
ii) gold
iii) magnesium
iv) iron
v) calcium

I, ii and v only

Ii, iv and v only

Iii and v only

I and iii only

V only

14. Which of the following observations positively identifies an acid?

Solution turn pink in phenolphthalein

Red litmus paper stays red

The substance feels slippery

Blue litmus paper turns blue

Oxygen gas is produced when a metal is added

15. XF₂ is the formula of a metallic fluoride. The formula of the corresponding metallic oxide of X is

XO.

XO2.

XO4.

X2O.

X2O3.

16. This acid is responsible for the pain felt from a stinging insect.

Formic acid

Sulfuric acid

Nitric acid

Acetylsalicylic acid

Citric acid

17. The major cause of acid precipitation from car exhaust is:

Hydrogen gas

Sulfur dioxides

Nitrogen oxides

Carbon monoxide

Carbon dioxide

18. How many atoms of oxygen in 3 molecules of aluminum phosphate?

1

2

3

4

12