EmSAT Chemistry 2

Question 1

What is the molarity of a solution containing 58.5 g of NaCl dissolved in 1 liter of solution? (Molar mass of NaCl = 58.5 g/mol)

Accepted Answer

1 M

Answer

0.5 M

Answer

2 M

Answer

58.5 M

Question 2

According to Le Chatelier's Principle, what happens when pressure is increased on the reaction N₂ + 3H₂ ⇌ 2NH₃?

Accepted Answer

Equilibrium shifts to the right (toward fewer moles of gas)

Answer

Equilibrium shifts to the left

Answer

No change occurs

Answer

The reaction stops

Question 3

What type of reaction is: 2Na + Cl₂ → 2NaCl?

Accepted Answer

Synthesis (combination)

Answer

Decomposition

Answer

Single replacement

Answer

Double replacement

Question 4

What is the oxidation state of sulfur in H₂SO₄?

Accepted Answer

+6

Answer

+2

Answer

+4

Answer

-2

Question 5

What distinguishes an exothermic reaction from an endothermic reaction?

Accepted Answer

Exothermic reactions release heat energy to surroundings, endothermic reactions absorb heat

Answer

Exothermic reactions are always faster

Answer

Endothermic reactions produce more products

Answer

There is no difference

Question 6

How many valence electrons does oxygen have?

Accepted Answer

6

Answer

2

Answer

4

Answer

8