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chapter 1 review
atoms and molecules
Question | Answer |
---|---|
1. positively charged particle in the nucleus of an atom | proton |
2. region surrounding an atoms nucleus where one or more electrons are often found | electron cloud |
3. negatively charged particle that occupies the space in an atom outside the nucleus | electron |
4. one or more atoms of an element having the same number of protons but a different number of neutrons | isotope |
5. region at the center of an atom that contains most of the mass of an atom | nucleus |
6. an atom that has a charge because it has gained or lost electrons | ion |
7. the number of protons in the nucleus of an atom of an element | atomic number |
8. uncharged particle in the nucleus of an atom | neutron |
9. the nucleus of an atom contains __________ and neutrons | protons |
10. the nucleus has a _______________ and the ___________ of the atom | positive charge; most mass |
11. an electron is a _____________ particle located outside the nucleus | negatively charged |
12. the modern model of an atom is called the ____________ model | electron cloud |
13. electrons that are close to the nucleus have ____________ than electrons that are farther from the nucleus | more energy |
14. the atomic number is the number of ____________ in the nucleus of an atom of an element | protons |
15. isotopes have the same number of protons but different numbers of __________ | neutrons |
16. an ion has a charge because it has gained or lost ___________ | electrons |
17. a ___________ ion has more protons than electrons | positive |
18. adding a ____________ to a neutral atom produces a new element | proton |
19. antonym: part | whole |
20. antonym: substance | mixture |
21.antonym: positive | negative |
22.antonym: proton | electron |
23.antonym: heterogeneous | homogeneous |
24. antonym: individual | multiple |
25.antonym: solvent | solute |
26.antonym: element | compound |
27.antonym: bond | detach |
28. which particle in an atom has a positive charge | proton |
29. which particle in an atom has no charge | neutron |
30. which particle in an atom has a negative charge | electron |
31. where is most of the mass of an atom found | nucleus |
32. a mixture in which two or more substances are evenly mixed but not bonded together | homogeneous mixture |
33. anything that has mass and takes up space | matter |
34. substance made of only one kind of atom | element |
35. a small particle that is the building block of matter | atom |
36. substance made of two or more elements that are chemically joined in a specific combination | compound |
37. a mixture in which the substances are not evenly mixed | heterogeneous mixture |
38. two or more atoms that are held together by chemical bonds and act as a unit | molecule |
39. matter with a composition that is always the same | substance |
40.true or false: gravity "is" matter because it does not have mass and volume | false; isn't |
41. true or false: each type of "atom" has a different number of smaller particles | true |
42. true or false: the "composition" of a substance is always the same | true |
43. true or false: the substances in a mixture "are" bonded together | false; are not |
44. true of false: all atoms of an "element" are alike | true |
45. true or false: the atoms in a "molecule" are held together by chemical bonds | true |
46. true or false: "elements" can be classified as metals, nonmetals, and metalloids | true |
47. true or false: compounds are made of atoms of "the same element" bonded together | false; different elements |
48. true or false: soda is an example of a "heterogeneous" mixture, or a mixture in which two or more substances are evenly mixed but not bonded together | false; homogeneous |
49. HE or HO granite | HE |
50. HE or HO smoke | HE |
51. HE or HO soda | HO |
52. HE or HO brass | HO |
53. HE or HO trail mix | HE |
54. HE or HO air | HO |
55. HE or HO tap water | HO |