Matter and Energy

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Across
  1. 2. The electrons in the outermost energy level of an atom that influence how an element will react with other substances
  2. 4. A substance that readily transfers heat or electrical energy.
  3. 7. A measure of how much matter is present in a substance.
  4. 11. A characteristic that can only be observed or measured when atoms of matter rearrange during a chemical change.
  5. 13. Most elements are metals. They are typically solid, shiny, malleable, and good conductors of heat and electricity.
  6. 14. The rows in a Periodic Table that classify the elements by the number of electron shells.
  7. 15. Rate at which a chemical substance tends to undergo a chemical reaction; significantly influenced by valence electrons of the reacting substances.
  8. 18. The smallest particle of an element, made of electrons, protons, and neutrons.
  9. 19. Any form of matter that is uniform throughout and has consistent properties.
  10. 23. The ability of a substance to transfer heat or electrical energy.
  11. 24. Chemical formulas and symbols written to represent a reaction
  12. 27. A solid that is deposited from a solution
  13. 31. The mass of a substance divided by its volume.
  14. 32. The columns on a Periodic Table that arrange the elements by the number of electrons that are in the outermost shell.
  15. 34. Characteristic that can be observed or measured without changing the substance; for example, color, melting point, or conductivity.
  16. 36. Elements that are typically not shiny, not malleable, and poor conductors of heat and electricity; usually gases or brittle solids.
  17. 39. A negatively-charged subatomic particle that orbits the atomic nucleus.
  18. 40. A one or two letter notation used to represent an atom of a particular element.
  19. 42. A substance made of two or more elements that are chemically combined in fixed amounts.
  20. 43. The mass of all reactants must equal the mass of all products. Matter is neither created nor destroyed.
Down
  1. 1. Unreactive non-metals in Group 18 of the Periodic Table.
  2. 3. Elements typically not shiny, usually a gas or brittle solid, not malleable, and poor conductors of heat and electricity.
  3. 5. A number placed in front of a chemical symbol or formula in order to balance the equation
  4. 6. A pure substance composed of the same type of atom throughout.
  5. 8. The number of protons in the nucleus of a single atom.
  6. 9. A number written below and to the right of an atomic symbol in a chemical formula that shows the number of a specific type of atom present
  7. 10. Most elements are metals; they are typically solid, shiny, malleable, and good conductors of heat and electricity.
  8. 11. A change that alters the identity of a substance resulting in a new substance or substances with different properties.
  9. 12. A process that absorbs heat
  10. 16. A shorthand notation that uses chemical symbols and numbers as subscripts to represent the type and number of atoms that are present in the smallest unit of the substance.
  11. 17. The ability of something to be reshaped without breaking.
  12. 20. A tendency to break rather than flex or bend.
  13. 21. A change to a substance that occurs without forming a new substance, such as a change in size or state of matter.
  14. 22. A substance that shows the property of electrical conductivity between that of a conductor and that of an insulator; the foundation of modern electronics.
  15. 25. A combination of two or more substances which do not chemically combine.
  16. 26. The area surrounding the nucleus of an atom where the electrons are found.
  17. 28. A process that releases heat
  18. 29. A material that does not conduct heat or electrical current.
  19. 30. Elements that have properties of both metals and nonmetals; sometimes referred to as semiconductors.
  20. 33. The way the surface of a mineral reflects light; either metallic or non-metallic such as silky, dull, glassy, or resinous.
  21. 35. A positively-charged subatomic particle of the nucleus of an atom that contributes to the mass of the atom
  22. 37. The mass of an atom, approximately equal to the number of protons and neutrons in the atom.
  23. 38. A subatomic particle of the nucleus of an atom that is without charge that contributes to the mass of an atom.
  24. 41. Anything that has mass and takes up space.