We need to eat food and breathe in oxygen in order to stay alive. We also breathe out carbon dioxide gas. Explain how these statements relate to the chemical equation for cellular respiration.

Nonmetal halogen family atmoic mass 35

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.

What type of chemical bond is formed between two atoms of bromine 1. metallic 2. hydrogen 3. ionic 4. covalent