Across
- 3. electrons that are found in the outermost shell
- 7. a system that can exchange both energy and matter with its surroundings
- 8. a column of chemical elements
- 11. calculated by adding protons and neutrons
- 12. a group of atoms that are chemically bonded to each other
- 13. a molecule in which one end of the molecule is slightly positive, while the other end is slightly negative
- 15. a form of matter that has uniform composition
- 18. a group of atoms that consist of at least two different elements
- 20. when a substance comes into contact with oxygen
- 22. a system that does not allow transfer of matter in or out
- 24. negatively charged ion
- 26. substances present at the end of a chemical reaction
- 28. the degree to which a substance dissolves
- 30. a molecule that has no separation of charge, so no positive or negative poles are formed.
- 31. an atom that has the same amount of protons and electrons
- 32. a form of an element that has a different number of neutrons
- 33. any substance that cannot be decomposed into simpler substances by ordinary chemical processes
- 36. where reactants are converted into different substances
- 37. an insoluble solid that emerges from a liquid solution
- 40. equal to the number of protons an element has
- 41. smallest unit of matter
- 42. the multiplier in a chemical formula
- 43. negatively charged subatomic particle
- 44. a row of chemical elements
- 45. type of bond that involves the mutual sharing of one or more pairs of electrons
Down
- 1. the material involved in the change is structurally the same before and after
- 2. subatomic particle with no charge
- 4. a property that depends on the amount of matter in a substance
- 5. substances present at the start of a chemical reaction
- 6. the process of burning something
- 9. the amount of force exerted per area
- 10. the number that indicates how many of each element are present in a chemical formula
- 14. 2-8-8
- 16. the tendency of an atom to attract electrons in a molecule
- 17. positively charged subatomic particle
- 19. A substance that is dissolved in a solution
- 21. type of chemical bonding that involves the electrostatic attraction between oppositely charged ions
- 23. the total mass of the products must be equal to the total mass of the reactants
- 25. acronym to help you remember the signs of a chemical change
- 26. when matter changes from one state of matter to another
- 27. any substance, usually liquid, which is capable of dissolving one or several substances
- 29. models that demonstrate an element's valence electrons
- 34. anything that has mass and volume (takes up space)
- 35. a property that's independent of the amount of matter in a substance
- 38. contains two or more substances that are not chemically combined (+)
- 39. positively charged ion