science homework

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Across
  1. 3. The smallest particle of an element; made of electrons, protons, and neutrons
  2. 5. Energy stored in chemical bonds and released through chemical reactions
  3. 6. Energy Energy from the Sun that reaches Earth as visible light, ultraviolet radiation, and infrared (heat) radiation Reactant A substance that takes part in and undergoes change during a chemical reaction
  4. 7. carbon dioxide and water into sugar (glucose) and oxygen
Down
  1. 1. A sugar composed of six carbon atoms that is the preferred energy source for most cells; produced by photosynthesis Molecule The simplest unit of a chemical compound that can exist, formed when two or more atoms join together chemically Photosynthesis A chemical reaction during which plants convert radiant energy from the Sun to chemical energy; the reaction
  2. 2. A substance produced during a chemical reaction
  3. 4. The process by which one or more substances change to produce one or more different substances