91Ó°ÊÓ

In the chemical reaction for the "burning" of sugar, \(\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}+6 \mathrm{O}_{2} \rightarrow 6 \mathrm{CO}_{2}+6 \mathrm{H}_{2} \mathrm{O}\), which substances are the reactants and which are the products? Does this equation represent a chemical change or a physical change?

Which one of the following is a homogeneous mixture: milk shake, 14 -karat gold (made by melting gold and other metals together), fog, blood?

True or false? The melting point and freezing point of water are the same temperature at normal atmospheric pressure.

Which one of the following is a homogeneous mixture: orange juice with pulp, wood, fog, bronze (made by melting copper and tin together)?

True or false? A theory is an attempt to explain why a law is true.

The freezing point of nitrogen is \(-210.0{ }^{\circ} \mathrm{C}\). The boiling point of nitrogen is \(-195.8^{\circ} \mathrm{C}\).