Across
- 1. 2 elements form a compound
- 7. describes how a substance changes into a new substance
- 9. a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.
- 13. same ratio of atoms no matter the size of this substance
- 14. hydrocarbon and oxygen form water and carbon dioxide
- 15. something in an experiment that stays the same
- 16. a change that creates a new substance
- 17. an element whose properties are intermediate between those of metals and solid nonmetals. They are electrical semiconductors
- 19. 1 compound form 2 or more elements
- 21. a particle smaller than an atom
- 23. an element, feature, or factor that is liable to vary or change
- 24. elements transfer electrons
- 26. ion with more than one atom, has a charge, acts like a single unit
- 27. can be observed without changing the substance
- 28. the mass of an atom of a chemical element expressed in atomic mass units
- 30. an atom or molecule with a net electric charge due to the loss or gain of one or more electrons
- 31. 1 element and 1 compound form are new element and a new compound
- 33. the energy stored in the bonds of a compound
- 34. the substance after the change
- 35. absorbs energy in the form of heat
- 36. variable whose variation does not depend on that of another
- 40. a negatively charged ion
- 41. a chemical equation that has an equal number of atoms on both sides of the arrow
- 44. elements share electrons
- 45. parts of mixture look different/distinguishable
- 46. an element or substance that is not a metal.
- 48. the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table
- 49. all atoms want 8 valence electrons like the noble gases
- 51. a multiplier or factor that measures some property
- 53. the symbolic representation of a chemical reaction in the form of symbols and formulae
- 54. a set of chemical symbols showing the elements present in a compound and their relative proportions, and in some cases the structure of the compound
- 55. a group or individual used as a standard of comparison for checking the results of a survey or experiment.
Down
- 2. releases energy in the form of heat
- 3. how compact an object is
- 4. a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivity
- 5. the substance before the change
- 6. an attribute, quality, or characteristic of somethin
- 8. a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign
- 10. a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.
- 11. a set of elements occupying a column in the periodic table and having broadly similar properties arising from their similar electronic structure.
- 12. an answer/belief having a sound basis in logic or fact; reasonable or cogent.
- 14. makes a reaction go faster, but is not used up
- 15. chemical change that produces a new substance
- 18. 2 compounds form 2 new compounds
- 20. a set of elements occupying an entire horizontal row in the periodic table.
- 22. the attractive force that holds atoms or ions together
- 25. the total number of protons and neutrons in a nucleus
- 29. two or more atoms physically combined
- 32. each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties
- 34. the law that states that the repeating chemical and physical properties of elements change periodically with the atomic numbers of the elements
- 37. a positively charged ion
- 38. a change that does not affect the identity ofriation does not depend on that the substance
- 39. variable whose value depends on that of another
- 40. simplest form of a substance
- 42. two more atoms chemically combined
- 43. parts of mixture look the same
- 45. an if then statement that can be proven
- 47. the positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mas
- 49. regions of space around the nucleus of an atom where an electron is likely to be found
- 50. an experiment/test of a hypothesis
- 52. simplest form of a substance