Final+Review+Guide

Part 1 - Lab Practical - You will be asked to work with a group and perform one of the water chemistry tests that we performed at Mashamoquet? - be able to read and interpret procedure - Identify safety precautions and follow them - collect data with minimal errors

Part 2 - Written Exam - must be done individually - multiple choice and short answer - Answer the following questions to help you review

Laboratory Skills 1.) What is a direct reading titrator?

2.) What does ppm stand for?

3.) 1 mg/L is equal to how many ppm?

4.) What does it mean to titrate something?

5.) What are two things that you should do before turning on a bunsen burner?

Density 6.) The density of water equals _ g/ml.

7.) If a substance had a density of .88 g/ml would if be floating on top of water or would be it be submerged in the water?

8.) If a substance had a density of 5 g/ml would it be floating on the water or submerged underneath it?

Solubility



9.) As temperature increases does the solubility of solids increase or decrease?

10.) As temperature increases, does the solubility of gasses increase or decrease?

11.) What is the solubility of NH3 at 10 degrees Celsius?

12.) What is the solubility of KCl at 10 degrees Celsius?

Chemical Reactions 13.) Circle the products of the following reactions

2H + O --> H2O CuSO 4 + Mg --> MgSO 4 + Cu

14.) Circle the reactants of the following reactions

2H + O --> H2O CuSO 4 + Mg --> MgSO 4 + Cu

15.) Balance the following equation. How many molecules of CO 2 do you end up with?

1 CH 4 + 2 O 2 → _CO 2 + 2H 2 O
Dissolved Oxygen 16.) How does dissolved oxygen get into our water supply?

17.) Why is dissolved oxygen important to the ecosystem?

18.) Why do we need to "fix" the oxygen, when preforming our Dissolved Oxygen Analysis

Water Hardness 19.) What causes water to be hard? 20.) What two ions did you measure for when you were looking for water hardness? 21.) Why is hard water beneficial to fish?

Alkalinity 22.) The alkalinity level in water determines if the water has the capability to buffer ______ . 23.) The most important form of carbonate in the water is __.__ 24.) What is the range of alkalinity for fresh water?

__pH__ 25.) If the pH is low then the solution is considered to be an __.__ __26.) If the pH is high then the solution is considered to be a__. __27.) Combining a base with an acid, causes both to be__ __.__ __28.) The pH of water is__ _, which is considered neutral.

Nitrate 29.) How does Nitrogen enter the water? 30.) What is denitrification?