Across
- 3. A radioactive isotope that emits radiation during decay (p. 28).
- 7. A reaction that breaks chemical bonds by adding water (p. 38).
- 9. A space region around the nucleus where electrons are likely to be found (p. 26).
- 12. Reaction A reaction where a compound breaks down into simpler substances (p. 36).
- 13. Energy Energy of motion (p. 24).
- 16. Bond A bond is formed by sharing electrons between atoms (p. 32).
- 18. A positively charged particle in the nucleus (p. 25).
- 20. The substance that dissolves the solute in a solution (p. 29).
- 23. A negatively charged particle outside the nucleus (p. 25).
- 24. Reaction A reaction that releases energy (p. 37).
- 27. The smallest unit of a compound with its properties (p. 28).
- 28. A homogeneous mixture of substances (p. 29).
- 29. Number The number of protons and neutrons in an atom’s nucleus (p. 27).
- 31. The capacity to do work or cause change (p. 24).
- 32. A substance that cannot be chemically broken down further (p. 25).
- 33. The amount of a substance in a given volume (p. 37).
- 36. An element that tends to lose electrons and form positive ions (p. 34).
- 39. A negatively charged ion (p. 32).
- 40. Physical combinations of substances not chemically bonded (p. 29).
- 42. A positively charged ion (p. 32).
- 43. Table A chart of elements arranged by atomic number, showing repeating properties (p. 25).
- 45. A substance that reduces hydrogen ion concentration (p. 39).
- 46. Energy Stored energy (p. 24).
- 47. A substance that increases hydrogen ion concentration (p. 39).
Down
- 1. Bond The force holding atoms together in molecules or compounds (p. 31).
- 2. A substance that speeds up a reaction without being consumed (p. 38).
- 4. The smallest unit of matter retaining element properties (p. 25).
- 5. A mixture of large particles that settle out over time (p. 30).
- 6. A reaction where a compound breaks into simpler substances (p. 36).
- 8. The loss of electrons from a substance (p. 36).
- 10. An atom’s tendency to attract electrons in a bond (p. 34).
- 11. A substance formed from two or more chemically bonded elements (p. 28).
- 14. A solution that resists pH changes (p. 41).
- 15. Reaction A reaction where parts of two reactants are exchanged to form new products (p. 36).
- 17. Bond A weak bond between a proton in one molecule and an electronegative atom in another (p. 34).
- 19. Energy The minimum energy required to start a reaction (p. 52).
- 21. Shell The outermost electron shell of an atom (p. 31).
- 22. Reaction A reaction that absorbs energy (p. 37).
- 24. A biological catalyst that speeds up reactions (p. 51).
- 25. Reaction A process that transforms one set of chemicals into another (p. 35).
- 26. Substances that change in a chemical reaction (p. 35).
- 30. Reaction A reaction where two or more substances form a new compound (p. 36).
- 34. An atom or molecule with an electric charge due to lost or gained electrons (p. 32).
- 35. Number The number of protons in an atom's nucleus (p. 27).
- 37. Energy Energy that travels in waves (e.g., light) (p. 24).
- 38. Atoms of the same element with different neutron numbers (p. 27).
- 41. Anything with mass and volume (p. 24).
- 43. Substances formed by a chemical reaction (p. 35).
- 44. A mixture with small particles that stay dispersed and don’t settle out (p. 30).
- 46. A measure of a solution's acidity or basicity (p. 40).