Across
- 3. a gas of diatomic molecules with the formula H 2
- 6. a process in which one or more substances, the reactants, are converted to one or more different substances, the products
- 8. the smallest particle of a chemical element
- 9. thing that is composed of two or more separate elements;
Down
- 1. a biological process where plants, algae, and certain bacteria use sunlight
- 2. a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction
- 4. an action performed or a feeling experienced in response to a situation or event.
- 5. an important heat-trapping gas, also known as a greenhouse gas
- 7. a pure substance composed of only one type of atom
- 10. Oxygen is a colorless, odorless gas, represented by the chemical symbol