Why is it important to perform this experiment in a well ventilated lab?
The sulphur dioxide gas released is a skin and eye irritant.
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5
What is the chemical formula for hydrochloric acid? Write your answer on the whiteboard.
HCl
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10
What were the two reactants in our experiment?
Hydrochloric acid and Sodium thiosulfate
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25
Rap a verse about the Sodium Thiosulfate + Hydrochloric acid. (Must mention at least 3 relevant scientific facts i.e. Solid sulfur sediment, endothermic reactions, chemical changes, sulphur dioxide gas formation, colour change etc.)
Nice bars
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banana
Go to last place!
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rocket
Go to first place!
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shark
Other team loses 5 points!
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lifesaver
Give 25 points!
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20
Spelling bee! You have to spell a word of my choice.
Hydrochloric acid
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10
What gas is produced as a result of the chemical reaction? HINT: The chemical formula is SO2.
Sulfur dioxide
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15
POV: Your lab partner added water to the hydrochloric acid without you knowing. How would this affect your experiment?
The rate of reaction would slow down as there is a decreased concentration of HCl.
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15
Draw a rough graph of your group's data on the whiteboard. Must include: scale (doesn't have to be perfect), axis titles and a trend line.
Points if graphed correctly.
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10
Was the reaction endothermic or exothermic?
Endothermic
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baam
Lose 25 points!
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seesaw
Swap points!
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rocket
Go to first place!
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thief
Give points!
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25
15
What extensions could you make to the experiment to explore a new variable or phenomenon? Name two.
Different concentrations of hydrochloric acid, the effect of temperature on rate of reaction, test how cloudy the solution becomes (cross test) etc.
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15
Explain what happened in the experiment as though you're talking to a first grader.
Mention: reactants, precipitation reaction, gas creation, endothermic reaction
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lifesaver
Give 25 points!
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seesaw
Swap points!
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rocket
Go to first place!
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banana
Go to last place!
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15
A student completes the experiment but sees no solid sulphur form at the bottom of the test tube. Suggest two errors they may have made.
Using hydrochloric acid that is too diluted, the room was too cold, they used the wrong/contaminated/expired reagents, etc.
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5
What colour was the precipitated sulphur at the bottom of your test tube?
