Across
- 2. the process by which one or more substances change to produce one or more different substances
- 8. a naturally occurring element of Earth; an essential building block of organic compounds
- 9. the process of obtaining energy from the breaking of chemical bonds in nutrients
- 10. a gas produced by plants during photosynthesis that animals use for respiration
Down
- 1. the simplest unit of a chemical compound that can exist, formed when two or more atoms join together chemically
- 3. the movement of elements or molecules through a repeated sequence of events
- 4. anything that has volume and mass
- 5. a gas that is a natural component of the atmosphere; produced by cells during cellular respiration and used by plants and other organisms for photosynthesis
- 6. a sugar composed of six carbon atoms that is the preferred energy source for most cells; produced by photosynthesis
- 7. the ability of a system to do work; required for changes to happen within a system