1. Quiz #4 A solution of lead (II) nitrate is added to aqueous potassium iodide and a precipitate of lead (II) iodide and aqueous potassium nitrate is formed. a)Write a word equation for the reaction b)Write a skeleton equaton c)Write a balanced chemical equation d)What type of chemical reaction is this?

2. What is an Acid? A substance that produces H + ions in solution **an acid is only an ‘acid’ when dissolved in solution (water) – must be aqueous.

3. What is a Base? Most bases are substances that produce hydroxide ions (OH - ) when dissolved in water.

4. What is an Indicator? Are chemicals that change colour in the presence of acids or bases. Many indicators will change one colour in an acid and another colour in a base. We can use the characteristic colour change of an indicator to identify a substance as being an acid or base.

5. The pH scale pH = power of hydrogen A scale that measures the concentration of hydrogen ions in solution. 0 ---acidic--- 7 (neutral)--basic– 14 -the lower the pH,-the higher the pH, the more H+ isthe less H+ is present present(lower concentration) (higher concentration)

6. Quiz #5 Hydrogen gas and oxygen gas are put under electrolysis to produce water. 1.Write the word equation 2.Write the skeleton equation 3.Write a balanced chemical equation 4.What type of reaction is this?

7. Fluorine gas reacts with hydrochloric acid to produce hydrofluoric acid and chlorine gas. 1.Word 2.Skeleton 3.Balanced 4.Type of reaction