Across
- 4. – a substance that is present at the beginning of chemical reaction
- 6. - a positively charged elementary particle that is in the nuclei of the atom.
- 7. – a gas that rarely reacts with other elements
- 11. – a vertical column in a periodic table; also called a chemical family
- 12. variable that is changed by the scientist.
- 14. - a piece of information used as evidence
- 15. - number of protons in the nucleus of each atom of a given element
- 16. - the group in an experiment or study that does not receive treatment
- 17. the ratio of mass to the volume of a substance
- 18. – a method of separating solids from liquids in a solution.
- 20. – a change in a substance that does not change the chemical makeup
- 24. - in favor of or against one thing, person, or group compared with another
- 27. – an atom that has lost or gained electrons and therefore has an electrical charge
- 28. - an element that conducts heat and electricity well, is shiny, and can be hammered
- 29. - a procedure for accomplishing or approaching something
- 32. – the scientific principle that matter is neither created nor destroyed
- 36. a conclusion reached on the basis of evidence and reasoning
- 38. – particle having no charge, mass slightly greater than that of a proton.
- 40. – in a solution, the substance that dissolves
- 41. – a horizontal row in a periodic table
- 44. - smallest part of element, composed of a nucleus proton, neutron and, electron.
- 45. - idea or explanation tested through study and experimentation
- 46. – the tendency of a substance to undergo chemical changes
- 47. – an element that does not conduct heat or electricity
Down
- 1. - a group of subjects who are exposed to the variable under study
- 2. – a solid that forms during a chemical reaction that takes place in a solution
- 3. - a chemical change that is accompanied by an absorption of heat.
- 5. – a process by which elements and compounds combine to form a new substance
- 6. – a chart that organizes information about all the known elements
- 8. - it is the sum of the protons and neutrons of an atom.
- 9. a mixture in which substances are not distributed evenly
- 10. - negative charge outside the nucleus of an atom.
- 13. - a chemical change that is accompanied by a release of heat.
- 19. the variable being tested in a scientific experiment.
- 21. - a homogenous mixture in which one substance is completely dissolved into another
- 22. – a change that results in the formation of a new substance or substances
- 23. - a force that holds atoms together in molecules
- 25. – a mixture in which substances are evenly distributed
- 26. - a description of a chemical reaction using chemical formulas
- 30. - two or more different elements join together chemically.
- 31. – matter made up of two or more substances that are not joined chemically
- 33. - a view or judgment formed about something,
- 34. – the smallest unit of a compound - Made of the same types of atoms.
- 35. – anything that has mass and volume
- 37. – an element that has some properties of both metals and nonmetals
- 39. – in a solution, the substance that does the dissolving
- 42. – a substance that is produced during a chemical reaction.
- 43. - substance that cannot be broken down into simpler substances.