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Solution: Which of the following is a chemical reaction?a) The melting of ice.b) The formation of a covalent bond between two amino acids.c) Making a hydrogen bond between a water molecule and a sugar molecule.d) Changing a carbon atom to a nitrogen atom by radioactive decay.

Problem

Which of the following is a chemical reaction?

a) The melting of ice.

b) The formation of a covalent bond between two amino acids.

c) Making a hydrogen bond between a water molecule and a sugar molecule.

d) Changing a carbon atom to a nitrogen atom by radioactive decay.

Solution

We’re being asked which of the following conditions is a chemical change

Let’s first define a physical change and a chemical change.

Physical change → there is a change in a matter as it goes from one physical state to another.

Chemical change → atoms rearrange themselves to create a new substance


Now, let’s take a look at each condition:

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