Across
- 4. The ____ gases are the last group of elements of the periodic table, known for being unreactive
- 5. Atoms of the same element with different numbers of neutrons
- 7. The process of preparing food by applying heat, causing chemical changes
- 9. The chemical ____ is a symbolic representation of a chemical reaction using chemical formulas
- 10. The mass ___ is the total number of protons and neutrons in an atom's nucleus
- 14. Elements that are shiny, conductive, and can be shaped
- 15. A gas that makes up about 78% of the Earth's atmosphere
- 17. A _____ change alters the form or appearance of a substance without forming a new substance
- 18. Change of ____ is a transition of a substance from one form (e.g. liquid) to another by adding or removing heat
- 19. A chemical reaction involving oxygen that produces heat and light
- 21. A slow chemical change that occurs iron reacts with oxygen and water
- 22. A group of atoms bonded together
- 23. A gas essential for respiration and combustion
- 25. A vertical column in the periodic table with elements that have similar properties
- 29. An ______ reaction is a chemical reaction that releases energy, usually as heat
- 31. A horizontal row in the periodic table
- 32. An atom that has gained or lost electrons, becoming charged
- 33. A shiny, grey metal that burns with a bright white flame
- 36. A property of a substance that can change during a chemical reaction
- 37. Hydrogen ____ is a compound that can be broken down into two gases through a chemical reaction
- 39. A substance that undergoes change in a chemical reaction
- 40. The central part of an atom, containing protons and neutrons
- 41. The smallest unit of matter which cannot be split
Down
- 1. The chemical ____ is a representation of a compound showing the elements and their ratios
- 2. The ___ number is the number of protons in the nucleus of an atom
- 3. An ______ reaction is a chemical reaction that absorbs energy, usually in the form of heat
- 6. A _____ change creates a new substance by breaking current bonds and forming new ones
- 8. Elements that are typically dull and poor conductors
- 11. A substance formed as a result of a chemical reaction
- 12. The atomic ___ is the average mass of an atom, based on the mass of protons, neutrons, and electrons
- 13. A positively charged particle in the nucleus of an atom
- 16. A negatively charged particle orbiting the nucleus of an atom
- 20. A chemical ____ is a one- or two-letter representation of an element
- 24. A pure substance made of only one type of atom
- 25. A substance that could be produced by a chemical reaction and cause bubbles
- 26. The _____ table shows all known elements arranged by atomic number
- 27. The ___ equation is a way to represent a chemical reaction using words instead of symbols
- 28. A reddish-brown metal that does not easily burn
- 30. A substance made of two or more different elements chemically bonded
- 34. A neutral particle found in the nucleus of an atom
- 35. Elements with properties between those of metals and nonmetals
- 38. A smell produced by a substance, often a sign of a chemical change