Activity: Dissolved Oxygen
Snap Test
Name:______Date: ______
Page 1
1 – What is the range of dissolved oxygen in ppm (parts per million) that the test covers? ______ppm
Page 2 - 3
2 – True or False? Dissolved oxygen is an important indicator of the quality of a body of water. _____
3 – What is the word equation for the process of photosynthesis?
4 – List one human practice that depletes oxygen in lakes.
______
5 – What nutrient do decomposers require to break dead organisms down? ______
6 – The temperature of the water affects the water’s capacity for holding dissolved oxygen. As the temperature of the water increases, the concentration of dissolved oxygen ______. As a result, there is seasonal ______in dissolved oxygen in a body of water.
7 - ______also play an important role in aeration of bodies of water. As wind blows across a water ______, oxygen is mixed with the water. On windless nights, oxygen ______can be so severe that is can cause substantial fish ______.
8 - ______: As water runs its course in a stream, oxygen is mixed in as the water flow is ______by obstructions such as ______, fallen trees, and waterfalls.
9 – Air holds ___% more oxygen than water.
10 – There are 2 classifications of the trophic state of water:______and ______
11 – A concentration of _____ppm is stressful to most forms of aquatic life.
ACTIVITY: Follow Mrs. Bracewell’s instructions to test three solutions: cold water, hot water and pond water. Record your results below.
AVOID AGITATION WHEN SAMPLING
1 – cold water:
2 – hot water:
3 – pond water:
Note: Coloured or Turbid samples will obscure the color comparison.
Analysis:
1 – Would you expect to find a higher dissolved oxygen content in a body of water in the winter or the summer? Why? ______
2 – List 3 factors that could influence the dissolved oxygen concentration of a body of water.
______
3 – Do you think it would be wise to stock a pond with game fish if it had a dissolved oxygen content of 3ppm? Why or why not? ______
______
MSDS
1 – What does MSDS stand for? ______
Examine the MSDS for the SNAP TEST – Dissolved Oxygen Activity and answer the following questions.
2 – What is the Trade Name: ______
3 – What is the first Component: ______
4 – Under the physical data:
a) What is the state? ______
b) Appearance: ______
c) Odour: ______
d) pH: ______
e) boiling point: ______
f) melting point: ______
5 – Under FIRE and EXPLOSION DATA:
a) What is the FLASHPOINT: ______
b) List 1 EXTINGUISHING MEDIA: ______
6 – Under REACTIVITY DATA:
a) Are there any hazardous decomposition products? ______
7 – Under HEALTH HAZARD DATA
a) List the MEDICAL CONDITIONS AGGRAVATED BY EXPOSURE:
______
8 – Describe the FIRST AID for EYE AND SKIN CONTACT:
______
9 – List 1 PRECAUTION when using the materials. ______
10 – For SPILL AND DISPOSAL PROCEDURES, what should be done? ______
______
11 – STORAGE: How should product be stored? ______
If you ever need information about a product you may come in contact in school or at a job, you can find out the MSDS information at: www.msds.com/