GACE Chemistry 2

Question 1

Which type of chemical bond results from the electrostatic attraction between oppositely charged ions?

Accepted Answer

Ionic bond

Answer

Ionic bonds form when one atom transfers electrons to another, creating oppositely charged ions that attract each other.

Question 2

A student dissolves 5.85 g of NaCl (molar mass 58.5 g/mol) in enough water to make 500 mL of solution. What is the molarity of the solution?

Accepted Answer

0.2 M

Answer

Moles of NaCl = 5.85/58.5 = 0.1 mol; Molarity = 0.1 mol / 0.5 L = 0.2 M.

Question 3

Which of the following best describes an exothermic reaction?

Accepted Answer

The reaction releases heat to the surroundings

Answer

Exothermic reactions release energy as heat, so the surroundings become warmer.

Question 4

What is the oxidation state of sulfur in H₂SO₄?

Accepted Answer

+6

Answer

Each H is +1, each O is −2; solving 2(+1) + S + 4(−2) = 0 gives S = +6.

Question 5

According to Le Chatelier's principle, what happens to the equilibrium position of N₂ + 3H₂ ⇌ 2NH₃ when pressure is increased?

Accepted Answer

Shifts right, producing more NH₃

Answer

Increasing pressure favors the side with fewer moles of gas; the right side has 2 moles vs. 4 on the left.

GACE - Georgia Assessments for the Certification of Educators Practice Test