Question 1

Why do apple slices turn brown after being cut?

Accepted Answer

Contain an enzyme that reacts with oxygen and iron-containing phenols that are also found in the apple.

Answer

Contain an enzyme that reacts with oxygen and sulfur-containing phenols that are also found in the apple.

Answer

Contain an enzyme that reacts with oxygen and hydrogen-containing phenols that are also found in the apple.

Answer

Contain an enzyme that reacts with oxygen and iron-containing glucose that are also found in the apple.

Question 2

What does the discoloration of food mean?

Accepted Answer

It can be due to oxidation, sometimes mold, and sometimes decomposition.

Answer

It can be due sulfurication, sometimes a mold, and sometimes decomposition.

Answer

It can be due to oxidation, sometimes mold, and sometimes composition.

Answer

All of the above

Question 3

What makes the iron chain change its color after some time?

Accepted Answer

It is made almost entirely of iron, it is the most highly manufactured man made material that is subject to rust.

Answer

It is made almost entirely of hydrogen, it is the most highly manufactured man made material that is subject to rust.

Answer

It is made almost entirely of iron, it is the most highly manufactured man made material that is subject to dust.

Answer

All of the above

Question 4

What change happens to water when heated?

Accepted Answer

Wa­ter that reach­es boil­ing point has char­ac­ter­is­tic fea­tures: the liq­uid seethes, bub­bles form in­side it, and a thick steam ris­es up.

Answer

Wa­ter that reach­es freezing point has char­ac­ter­is­tic fea­tures: the liq­uid seethes, bub­bles form in­side it, and a thick steam ris­es up.

Answer

All of the above

Answer

Wa­ter that reach­es boil­ing point has char­ac­ter­is­tic fea­tures: the liq­uid seethes, bub­bles form in­side it, and a thick steam sinks down.

Question 5

What change happens to egg when heated?

Accepted Answer

Egg, when applied heat, becomes solid

Answer

All of the above

Answer

Become chicken

Answer

Egg, when applied heat, becomes liquid

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