Photosynthesis Unit Vocabulary

2. an experiment in which only one variable is changed
5. an elongated cell organelle containing chlorophyll where photosynthesis takes place
6. the amount of matter in an object
8. a chemical bond in which atoms share one or more pairs of electrons
11. a small, hard structure that contains the embryo of a plant
12. a factor that can be changed in an experiment
14. the number of protons in the nucleus of an atom
15. a substance composed of carbon and hydrogen
17. organisms that are capable of making their own food
19. a particular region where electrons can orbit a nucleus
20. rod-shaped organelles with a double membrane which converts the energy stored in glucose into ATP for the cell
23. a negatively charged particle that moves around the nucleus
24. organisms that are not capable of making their own food
26. electrons found in the outermost energy level of an atom
31. a group of two or more atoms joined by covalent bonds
32. a combination of chemical nutrients including nitrogen, phosphorus, and potassium
33. a positively charged particle located in the nucleus of an atom
34. a molecule that contains carbon-hydrogen bonds
35. a molecule that forms a ring structure
36. a substance made up of two or more different elements
38. an atom or molecule that has an electrical charge because it has gained or lost electrons
39. a mixture of decaying organic materials such as rotting vegetables and lawn clippings

1. a strong force holding two atoms together in a molecule or crystal structure
3. a group of symbols that describe the proportions of atom of different elements in a molecule or compound
4. a process by which plants convert sunlight, water, and carbon dioxide into food energy (sugar), oxygen, and water
7. a chart that organizes the chemical elements based upon their properties
9. the positively charged, dense center of an atom containing protons and neutrons
10. a diagram that illustrates the chemical bonds in a molecule
13. one of several forms of the same element
16. a green molecule which uses light energy from sunlight to change water and carbon dioxide gas into sugar and oxygen
18. a particle with no charge located in the nucleus of an atom
21. a mixture of tiny rock fragments and organic matter
22. the number of protons plus neutrons in the nucleus of an atom
25. the process by which the chemical energy of food molecules is released and changed into ATP
27. the basic unit of matter
28. a diagram that shows the element symbol surrounded by dots representing valence electrons
29. a pure substance that cannot be broken down into simpler substances by ordinary chemical means
30. an atom capable of releasing radiation
37. a chemical bond formed when electrons are transferred from one atom to another