Across
- 3. a pure substance that forms when two or more elements join chemically in a fixed proportion.
- 4. the basic building block of most of the matter around us.
- 6. matter that has the same chemical composition throughout and cannot be separated into its parts by physical means.
- 8. a process used to separate the parts of a mixture by particle size.
- 10. the tendency of a substance to undergo chemical changes.
- 12. matter made up of two or more substances that are not joined chemically.
- 13. a code, usually made up of one or two letters, used to represent an element.
- 20. a solid that forms during a chemical reaction that takes place in a solution.
- 21. a mixture in which substances are evenly distributed.
- 22. a vertical column in the periodic table.
- 23. a measure of an atom's mass that is equal to the number of protons & neutrons in the atom's nucleus.
- 24. a substance that is present at the beginning of a chemical reaction.
- 25. a particle with no charge, found in the nucleus of an atom.
- 27. a chart that organizes information about all the known elements according to their properties.
- 29. a characteristic of a substance that cannot be observed without changing the identity of the substance.
- 30. an element that does not conduct heat or electricity well and is dull and brittle.
- 31. a group of two or more atoms held together by chemical bonds.
- 33. a process by which elements and compounds combine to form new substances.
- 35. a horizontal row in the periodic table.
- 36. a method for separating solids from liquids in a solution.
- 37. a description of a chemical reaction using chemical formulas, subscripts, and coefficients.
Down
- 1. the scientific principle that matter is neither created nor destroyed during a chemical reaction.
- 2. a number that tells how many atoms of each element are in a molecule.
- 5. one of the basic substances that combine to form all other substances; a substance that cannot be broken down into simpler means.
- 7. the center of an atom, containing protons and neutrons.
- 9. a group of chemical symbols and numbers that shows the number of atoms of each element in a molecule.
- 11. a negatively charged subatomic particle that is located outside the nucleus of an atom.
- 14. a change that results in the formation of a new substance or substances.
- 15. a change in a substance that does not change the chemical makeup of the substance.
- 16. a mixture in which substances are not distributed evenly.
- 17. a characteristic of a substance that can be observed directly or measured with a tool without changing the identity of the substance.
- 18. a substance that is produced during a chemical reaction.
- 19. the number of protons in the nucleus of an atom.
- 20. a positively charged particle found in the nucleus of an atom.
- 26. an element that has some properties of both metals and nonmetals.
- 28. a number written before a chemical formula to show how many atoms or molecules of that substances are involved in a reaction.
- 32. a method used to separate a dissolved solid from a liquid.
- 34. an element that conducts heat & electricity well, is shiny, and can be hammered into sheets or drawn into wires.