1. Explain how covalent bonds in carbon account for the vast number of carbon compounds, including those responsible for living organisms.

2. When hydrochloric acid is dropped on calcium carbonate a reaction occurs.

a) What type of Chemical reaction occurs?

b) What are the products of the reaction? Write chemical compounds' formula and name each product?

c) Write the chemical reaction ( including the state of matter of all reactants and products)

d) Neither of this products is a gas but bubbles are released during this reaction. Infer the identity of the gas.

e) What type of reaction could produce this gas?

f) Write the chemical reaction for the formation of gas.

3. Problem: A 0.5000L volume of a solution contains 36.49 g of magnesium chloride. What is the molarity of the solution? Show you work step by step.

4. Write the CHEMICAL REACTION for :

a) When dissolved barium chloride reacts with dissolved potassium sulfate in water, barium sulfate precipitate and aqueous potassium chloride are made.

b) When calcium chloride and potassium phosphate are dissolved in water they react to form aqueous potassium chloride and calcium phosphate powder.

c) When sodium metal reacts with iron (III) chloride, iron metal and sodium chloride are formed.

5. Write the WORD CHEMICALCHEMICAL REACTION for:

a) Reaction I

2 C₁₂H₂₂0₁₁ (s) + 24 0₂ (g) 24 CO₂ + 22 H₂O (1) + heat
When

b) Reaction II

Ca(OH)₂ (aq) + H₂SO₄ (aq) CaSO₄ (s) + 2 H₂O (1) + heat
When