Question

1. choose the best answer. which statement is true about water? water is clear and polar and has poor thermal conductivity. water is clear and nonpolar and has good thermal conductivity. water is muddy and nonpolar and has poor thermal conductivity. water is clear and polar and has good thermal conductivity. 8. choose the best answer. which statement is true about nitrogen gas, which is made of two elements of nitrogen chemically combined (n₂)? it is a molecule and a compound. it is a compound. it is a molecule.

Explanation:

1. For water: Water is a clear - liquid. Its molecular structure makes it polar due to the uneven distribution of electrons. And it has relatively poor thermal conductivity compared to metals.
2. For nitrogen gas ($N_2$): A molecule is a group of two or more atoms held together by chemical bonds. A compound is a substance made up of two or more different types of elements chemically combined. Since $N_2$ is made up of only nitrogen atoms, it is a molecule but not a compound.

Answer:

1. Water is clear and polar and has poor thermal conductivity.
2. It is a molecule.