Section 3 Reveiw

Which one of the following is a property of a base?

• A. Turns blue litmus red.

• B. Tastes sour.

  .

• C. Reacts with metal oxides to produce a salt and water.

• D. Usually produces hydroxide ions in aqueous solution

Terry decides to fertilize the flower beds. The phosphate fertilizer he decides to use is prepared at an industrial plant in Fort Saskatchewan by a number of steps, one of which is a reaction between calcium phosphate and sulfuric acid, according to this equation:

Ca₃(PO₄)_2(s) + 3H₂SO_4(aq) à 3CaSO_4(s) + 2H₃PO_4(aq)

The acid formed by this reaction is called:

• A. Hydrogen phosphate

• B. Calcium phosphate

• C. Phosphoric acid

• D. Sulfuric acid

Al had heard about acid rain and wondered about the pH of the lake water. He tested it with a pH meter and found it to be 8.1. He should infer that the water was

• A. Neutral, and not harmful to most aquatic organisms

• B. Very acidic, and harmful to most aquatic organisms

• C. Slightly basic and harmful to most aquatic organisms

• D. Slightly acidic, and not harmful to most aquatic organisms

Sometimes when ionic solutions are mixed, they form a precipitate. A precipitate is

• A. an electrolyte

• B. a mixture of dissolved ions

• C. a solid substance that forms when two liquids are mixed

• D. an aqueous substance that forms when two liquids are mixed

When you light wood on fire it gives off heat, this combustion reaction

• A. absorbs energy and is exothermic

• B. releases energy and is exothermic

• C. absorbs energy and is endothermic

• D. releases energy and is endothermic

The total number of atoms before a reaction is equal to the total number of atoms after a reaction. This illustrates

• A. that atoms are all the same size

• B. the law of chemical reaction

• C. the law of conservation of mass

• D. that no new substance is produced in a chemical reaction

Which of the following are very soluble?

I K₂S

II PbBr₂

III Ca(OH)₂

• A. I and II only

• B. I and III only

• C. II and III only

• D. I, II, and III

Balance, answer using coefficient numbers only, no spaces

__H₃PO₄ + __NaOH --> __Na₃PO₄ + __H₂O

Balance, Answe using coefficient numbers only, no spaces

__C₂H₄ + __O₂ à __CO₂ + __H₂O

Which of the following are properties of an ionic compound?

• Conductive

• Turns Red Litmus Blue

• Can be solid, liquid or gas at room temperature

• Generally insoluble