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Types of Chemical reactions Lab Name______________________________pd_____
This video will help : types of chemical reactions also, see chapter 8 notes reactions
Part 1 chemical reactions
Purpose: Observe different types of chemical reactions, identify products, write chemical equations, and classify reactions.
Discussion: Use the oral directions: You must LISTEN to the tips given.
Part1 Procedure:
Carefully mix drops of solution on the plastic grid provided.
On the table provided, write ’nr’ if there is no reactions, or write ‘ppt’ and note color if a precipitate is observed.
Avoid contamination by using the appropriate dropper and by not touching the drops with the dropper.
Rinse the plastic grid off in the sink, and dry for next class.
Answer the questions on the handout for homework
Data:
All (aq) Lead II nitrate Potassium chloride CopperII sulfate Sodium hydroxide Sodium iodide Sodium nitrate Tap water
Lead II nitrate
Potasium chloride
Copper II sulfate
Sodium hydroxide
Sodium iodide
Sodium nitrate
Tap water
Distilled water
Conclusion questions:
How can page 860 (e r64) be used to determine if a product is a precipitate or aqueous?
Would sodium chloride solution and silver nitrate solution react? Explain why or why not and write equation if there is a reaction.
How about sodium sulfate and potassium iodide solutions? Explain why or why not and write equation if there is a reaction.
Why do some solutions not form precipitates when mixed?
Explain the results with tap and distilled water.
Classify these reactions as one of the 5 types, and as exo or endothermic.
Write balanced chemical equations with states for all reactions. (omit nr and any with tap or distilled water- there will be 6 to write equations for). Use p860(e r64) to identify precipitates. Use the next page of solubilities to help you decide if unsure.
Did you miss part 1 of the lab? watch it here
here is a picture of the results
Part2 procedure:
Add a tiny amount of yeast to a test tube filled 3/4 full of hydrogen peroxide.
Using your thumb to loosely contain the gas and liquid, shake & observe.
Test the gas using a splint; first for oxygen oxygen test , then for hydrogen. hydrogen test
Repeat as desired. Discard the solution in the sink, rinse test tube.
Answer these questions:
What was the identity of the gas produced? Evidence?
Is there another product? Reason?
Write a formula equation, then balance for this reaction. (Hint: the yeast is a catalyst; catalysts are placed above the arrow not in products or reactants)
Classify the reaction as one of the 5 types; also classify it as endo or exothermic.
Why is hydrogen peroxide stored in a brown bottle?
miss Part 2 with the hydrogen peroxide? Watch this.
Part3 procedure:
Put 3-4 pieces of zinc in 1/3 test tube of Hydrochloric acid solution.
Test the gas as we did in part 2 in order to establish identity, repeat as desired.
Decant the acid into the sink, rinsing with plenty of water.
Place remaining zinc in the pile at the back of the room.
Answer these questions:
What is the gas? Evidence?
Why collect it in an upside down tube?
Is there another product? Reason?
Write a chemical equation for the acid metal reaction, including states. Classify this reaction as one of the 5 types, and as exo or endothermic.
Write a chemical equation for the reaction (with states) that happened when the gas was tested. Classify this reaction as one of the 5 types, and as exo or endothermic. What was the limiting reactant? the excess reactant?
What had to be dissolved in water at the end of the experiment (besides leftover reactants)? What would you do in order to observe this substance?
The fifth type of chemical reaction occurred when we used the bunsen burners. The spark you used to start the burner is called _________ energy. Write the chemical equation (with states) for this reaction. Classify it as endo/exo and as one of the 5 types. What was the limiting reactant? the excess reactant?
miss part3 - zinc and HCl* ? watch it*
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