Anti-Z

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The Anti-ZChemistry

The school’s chemistry laboratory was full of dead zombies. The floor was covered with white powder. Some empty bottles lying on the floor were labelled as “corn starch”, while the empty bottles found on the laboratory bench were labelled as “aspirin”. There were only two bottles left in the laboratory labelled as “Substance A” and “Substance B” that looked very much like corn starch and aspirin. Aspirin could kill zombies as zombies are allergic to the main ingredient of aspirin, which is salicyclic acid. You must found out which of the two bottles left is aspirin to escape the laboratory safely. You will conduct a series of chemical test and identify whether “Substance A” or “Substance B” is aspirin

A or b?

Let's Go!

your Mission

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03 Ferric chloride solution test

02 Iodine test

01 Solubility in water

Reward

Solve the chemical test and identify the anti-Z!

Index

Solubility in Water

Please watch the following video

Test 1

Test tube with Substance A

Test tube with Substance B

Test tube with Control

QUESTION 1/6

Which test tube produces a clear solution?

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Wrong answer!

NEXT

RIGHT!

Substance A is soluble in water

Substance B is soluble in water

Control is slightly soluble in water

QUESTION 2/6

Based on the solubility test in water, which of the following statements is TRUE?

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Wrong answer!

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RIGHT!

Aspirin contains derivative of salicylic acid. From Test 1, for the solubility of Substance A and Substance B in water, it is deduced that we cannot confirm which substance is aspirin. Thus, we need to conduct more chemical tests to confirm the identity of Substance A and Substance B by comparing with Control (pure salicylic acid). Although Substance A or Substance B might contain salicylic acid, they might not be soluble because they also contain other chemicals. These chemicals might be present in a higher content as compared to the amount of salicylic acid.

Completed

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03 Ferric chloride solution test

02 Iodine test

01 Solubility in water

Reward

Solve the chemical test and identify the anti-Z!

Index

Reaction with iodine solution

Please watch the following video

Test 2

Brown

Blue

White

QUESTION 3/6

What is the colour of iodine solution?

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Wrong answer!

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RIGHT!

Substance A contains no starch

Substance B is corn starch

Control contains starch

QUESTION 4/6

Based on the substances reaction with iodine solution, which of the following statements is TRUE?

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Wrong answer!

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RIGHT!

Iodine solution is used to confirm the presence of starch. Since our test samples consist of aspirin and corn starch, we could use iodine solution and observe a blue coloured complex formed in the presence of starch. From Test 2, for the reaction of Substance A and Substance B with iodine solution, it is deduced that we cannot confirm which substance is aspirin. This is due to the addition of starch into the aspirin tablet as a distintegrating agent. Thus, both substances changed the brown colour iodine solution to blue coloured complex.

Completed

Completed

Locked

03 Ferric chloride solution test

02 Iodine test

01 Solubility in water

Reward

Solve the chemical test and identify the anti-Z!

Index

Reaction with alkaline ferric chloride

Please watch the following video

Test 3

To produce alkaline solution

To produce neutral solution

To produce acidic solution

QUESTION 5/6

What is the function of sodium hydroxide solution in the reaction?

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Wrong answer!

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RIGHT!

Substance A contains aspirin

Substance B contains aspirin

QUESTION 6/6

Based on the reaction of substances with alkaline ferric chloride solution, which substance contains aspirin?

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Wrong answer!

NEXT

RIGHT!

From Test 3, for the reaction of Substance A and Substance B with alkaline ferric chloride solution, we can now identify which substance contain aspirin between Substance A and Substance B based on which substance formed similar reaction to the control salicylic acid. From this test, it is confirmed that Substance A is aspirin because it releases salicylic acid under alkaline condition to form purple coloured complex with ferric chloride.

Congratulations!You have killed the zombies! You obtained: