Answer the questions on the basis. of your understanding of the following passage, table and rela...

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Counter-Strike: Source
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Counter-Strike: Source (2004)
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Answer the questions on the basis. of your understanding of the following passage, table and relared studied conceprs:
Nick and Jody were classmates. They both are keen of performing experiment to prove known facts. Their science teacher told them about the tooth decay by the acidic substances. They both tried to prove it separately.
Nick knew that human teeth and eggshells are made of similar substances so he set up an investigation using eggshells.
Nick found rhat the mass of the eggshells in beakersand X decreased but the mass of the eggshells in beakers Y and Z did not. Jody was investigating the effect of different types of soft drink on human teeth. She used identical shells to model teech. She put one shell in each type of soft drink for two meeks. To find out how much of the shell has dissolved, Jody investigation and calculated the change in the mass of the shells.
The table shows the changes in the mass of the shells.

4c Change in mass of shells (g)

Type of soft drink Trial 1 Trial 2 Trial 3 Trial 4

Cola 2.01 2.03 2.34 2.01

Orange 2.10 2.51 2.16 2.15

Lemonade 1.04 1.06 1.05 1.03

Cream soda 1.07 1.08 1.07 1.07


Why did Nick crush the eggshells?
(a) To increase the surface area of eggshells in contact with the liquid
(b) To make sure that the eggshells were completely covered by liquid
(c) To make it easier to compare the amounts of eggshells in the beaker
(d) To make the eggshells in all the beakers appear to have the same colour

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