Question

how do the chemical properties of elements affect chemical reactions? *
the chemical properties of elements only affect their color.
the chemical properties of elements determine which substances can react together and what products will form.
the chemical properties of elements only affect their melting points.
the chemical properties of elements do not influence chemical reactions.

Explanation:

Chemical properties of elements, such as reactivity and valence - electron configuration, decide the substances that can react and the products formed. Color and melting points are physical properties. Chemical properties are crucial for chemical reactions.

Answer:

The chemical properties of elements determine which substances can react together and what products will form.