Question

1. choose the best answer.

a(n) ______ is a chemical combination of atoms.
○ molecule
○ element
○ mark
○ property

1. choose the best answer.

elements and compounds are both ______ that have their own unique properties.
○ medleys
○ pure substances
○ forces
○ dynamic material

Explanation:

Sub - Question 1

To solve this, we recall the definitions of the terms. A molecule is defined as a chemical combination of atoms (it can be of the same or different atoms). An element is a pure substance made of only one type of atom. "Mark" and "property" are not related to the chemical combination of atoms. So the correct option is "molecule".

We know the classification of matter. Pure substances are substances with a definite composition. Elements are pure substances made of one type of atom, and compounds are pure substances made of two or more types of atoms chemically combined. "Medleys" are mixtures, "forces" are not related to the classification of elements and compounds, and "dynamic material" is not a standard term for this context. So elements and compounds are both pure substances.

Answer:

A. molecule

Sub - Question 2