four preparations involving table sugar (sucrose) are described below. analyze the sugar preparation processes and the end products.

| sugar water | sugar floss | sugar caramel | rock sugar |
| --- | --- | --- | --- |
| image of sugar being added to water sugar is added to water, and the water is stirred until the sugar is no longer visible. | image of sugar floss sugar is melted and blown with a fan to make thin threads of solid sugar. | image of sugar caramel pure sugar is melted and cooked until it changes color and becomes a thick, sticky liquid | image of rock sugar lollipops a highly concentrated solution of sugar water is prepared, large sugar crystals are allowed to form slowly, and then dye is added |

which of the following is evidence that a chemical reaction has taken place in one of the processes?

a. the color change that takes place after heat melts and begins to decompose the sugar
b. the melting and re - solidification of sugar into threads, which are different from sugar’s natural cube - shaped crystals
c. the slow growth of giant sugar crystals from a highly concentrated sugar - water solution and added dye
d. the dissolution of solid sugar in water to form a thin, colorless, odorless liquid

Question

four preparations involving table sugar (sucrose) are described below. analyze the sugar preparation processes and the end products.

| sugar water | sugar floss | sugar caramel | rock sugar |
| --- | --- | --- | --- |
| image of sugar being added to water sugar is added to water, and the water is stirred until the sugar is no longer visible. | image of sugar floss sugar is melted and blown with a fan to make thin threads of solid sugar. | image of sugar caramel pure sugar is melted and cooked until it changes color and becomes a thick, sticky liquid | image of rock sugar lollipops a highly concentrated solution of sugar water is prepared, large sugar crystals are allowed to form slowly, and then dye is added |

which of the following is evidence that a chemical reaction has taken place in one of the processes?

a. the color change that takes place after heat melts and begins to decompose the sugar
b. the melting and re - solidification of sugar into threads, which are different from sugar’s natural cube - shaped crystals
c. the slow growth of giant sugar crystals from a highly concentrated sugar - water solution and added dye
d. the dissolution of solid sugar in water to form a thin, colorless, odorless liquid

Accepted Answer

# Brief Explanations:
A chemical reaction produces new substances, with color change often indicating this. Sugar caramelization involves heating sugar until it decomposes (forming new compounds) and changes color—this is a chemical change. The other options (melting/re-solidification, crystal growth, dissolution) are physical changes (no new substances form).

# Answer:
A. the color change that takes place after heat melts and begins to decompose the sugar

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