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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heart
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gold
Win 50 points!
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rocket
Go to first place!
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baam
Lose 20 points!
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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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5
What is the chemical formula for hydrochloric acid? Write your answer on the whiteboard.
HCl
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5
What colour was the precipitated sulphur at the bottom of your test tube?
Yellow
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15
A student stored their sodium thiosulfate on a hot windowsill for several days. Once it was time to perform the experiment, they found that the reactants acted strangely. Why might this be?
Heat can cause sodium thiosulfate to decompose or degrade over time, affecting its reactivity.
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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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10
Was the reaction endothermic or exothermic?
Endothermic
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monster
Reset all scores!
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fairy
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shark
Other team loses 10 points!
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banana
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heart
Other team wins 10 points!
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gift
Win 20 points!
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gift
Win 10 points!
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banana
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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
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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10
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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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
What were the two reactants in our experiment?
Hydrochloric acid and Sodium thiosulfate
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10
What gas is produced as a result of the chemical reaction? HINT: The chemical formula is SO2.
