2. 8 th Grade Chemistry STAAR Review

3. 500 400 300 200 100 Everything Chemistry Symbols, Formulas, Equations Physical vs Chemical Changes Periodic Table Subatomic Particles

4. Categories This part of the atom, which has the most mass, contains the neutrons and protons…. Subatomic Particles Prompt 100 Points

5. Categories Subatomic Particles 100 Points the NUCLEUS

6. Categories SUBATOMIC PARTICLES 200 Points Protons have this type of electrical charge….

7. Categories POSITIVE SUBATOMIC PARTICLES 200 Points

8. Categories SUBATOMIC PARTICLES 300 Points Electrons are negatively charged and live in the….

9. Categories SUBATOMIC PARTICLES 300 Points ELECTRON CLOUD

10. Categories The proton determines an element’s ________, whereas the valence electron determines an elements _______________. A.Chemical reactivity; Identity B.Volume, Mass C.Identity, Chemical reactivity SUBATOMIC PARTICLES 400 Points

11. Categories Protons determine an element's identity and valence electrons determine an element’s reactivity. SUBATOMIC PARTICLES 400 Points

12. Categories In order for an element to be neutrally charged, it must have the same number of _________ and ________. SUBATOMIC PARTICLES 500 Points

13. Categories PROTONS (+) AND ELECTRONS (-) SUBATOMIC PARTICLES 500 Points

14. Categories The periodic table is made up of 18______. (families/columns) PERIODIC TABLE 100 Points

15. Categories PERIODIC TABLE 100 Points GROUPS

16. Categories PERIODIC TABLE 200 Points Which type of elements are malleable, good conductors, and have a shiny luster?

17. Categories METALS PERIODIC TABLE 200 Points

18. Categories PERIODIC TABLE 300 Points An atom of an element has 22 protons, 26 neutrons, and 18 electrons. Which element is this?

19. Categories PERIODIC TABLE 300 Points TITANIUM is atomic # 22, it has 22 protons.

20. Categories Lithium is in Period 2. This tells me that lithium has 2 ___________ __________. PERIODIC TABLE 400 Points

21. Categories ENERGY LEVELS; lithium is period 2 and has 2 energy levels PERIODIC TABLE 400 Points

22. Categories Magnesium has a shiny, silver appearance. It has other physical properties of metals and is reactive. Which element would most likely have similar chemical properties to magnesium? WHY?? A.Argon B.Aluminum C.Silicon D.Calcium PERIODIC TABLE 500 Points

23. Categories Calcium; calcium and magnesium are in the same group and share similar chemical properties PERIODIC TABLE 500 Points

24. Categories Sugar dissolving in water is an example of a _______ change. PHYSICAL VS CHEMICAL CHANGE 100 Points

25. Categories 100 Points PHYSICAL; no new substance was created PHYSICAL VS CHEMICAL CHANGES

26. Categories PHYSICAL VS CHEMICAL CHANGES 200 Points All of the following are evidence of a chemical change except for: A.Precipitate (solid) forms B.Unexpected change in color C.Change in state of matter D.Gas produced

27. Categories C. change in state of matter (Ex. Ice melting is a physical change, still H 2 O) PHYSICAL VS CHEMICAL CHANGES 200 Points

28. Categories PHYSICAL VS CHEMICAL CHANGES 300 Points What occurs in every chemical reaction? A.Atoms are destroyed B.New substances with different properties are formed C.The molecules stay the same with the reactants and products.

29. Categories PHYSICAL VS CHEMICAL CHANGES 300 Points B. New substances with different properties are formed

30. Categories A student mixed 2 clear liquids in a beaker to form a new solution. Which would indicate that a chemical reaction did NOT occur? A.The new solution remained clear B.The new solution turned blue C.The new solution produced gas bubbles D.The new solution contained a precipitate PHYSICAL VS CHEMICAL CHANGES 400 Points

31. Categories A. The solution remained clear PHYSICAL VS CHEMICAL CHANGES 400 Points

32. Categories During the process of digestion, food is taken into the mouth, and several processes occur. The teeth and tongue act to break up food into smaller particles. At the same time, salivary amylase helps to begin the breakdown of carbohydrates into much smaller sugars. Which of the following is most true regarding these processes? A.Both processes involve physical changes. B.Chewing is a chemical change while the process of salivary amylase is a physical change C.Chewing is a physical change while salivary amylase is a chemical change PHYSICAL VS CHEMICAL CHANGES 500 Points

33. Categories C. Chewing is a physical change while salivary amylase is a chemical change; DIGESTION IS CHEMICAL PHYSICAL VS CHEMICAL CHANGES 500 Points

34. Categories How many atoms of hydrogen are in one molecule of acetic acid? CH 3 COOH SYMBOLS, FORMULAS, EQUATIONS 100 Points

35. Categories SYMBOLS, FORMULAS, EQUATIONS 100 Points 4 hydrogen atoms CH 3 COOH

36. Categories SYMBOLS, FORMULAS, EQUATIONS 200 Points Sodium Carbonate (Na 2 CO 3 ) How many different elements are found in a molecule of sodium carbonate?

37. Categories 3 elements: sodium, carbon, oxygen SYMBOLS, FORMULAS, EQUATIONS 200 Points

38. Categories SYMBOLS, FORMULAS, EQUATIONS 300 Points Which substance contains the most atoms? SubstanceChemical Formula Baking Soda NaHCO 3 Vinegar C2H4O2C2H4O2 Ethyl Alcohol C2H6OC2H6O

39. Categories SYMBOLS, FORMULAS, EQUATIONS 300 Points Ethyl Alcohol 9 total atoms

40. Categories 2H 2 + O 2 2H 2 O Is this a balanced chemical equation? How do you know? SYMBOLS, FORMULAS, EQUATIONS 400 Points

41. Categories 2H 2 + O 2 2H 2 O Yes; there are 4 hydrogen atoms on both sides of the equation and 2 oxygen atoms on both sides; the reactants = the products SYMBOLS, FORMULAS, EQUATIONS 400 Points

42. Categories Based on the Law of Conservation of Mass, what conclusion can be made about a balanced chemical equation? A.The products contain more atoms than the reactants B.The atoms of the reactants lose protons when new products form C.The atoms of the reactants are rearranged to form new products SYMBOLS, FORMULAS, EQUATIONS 500 Points

43. Categories C. The atoms of the reactants are rearranged to form new products SYMBOLS, FORMULAS, EQUATIONS 500 Points

44. Categories An electron differs from a proton because an electron’s mass is… A.Much less than that of a proton B.Much more than that of a proton C.The same as a proton D.A negative number EVERYTHING CHEMISTRY 100 Points

45. Categories EVERYTHING CHEMISTRY 100 Points A.Much less than that of a proton; Protons are 1800 times more massive than electrons

46. Categories EVERYTHING CHEMISTRY 200 Points How many neutrons does an atom of aluminum have?

47. Categories 14 neutrons Mass:27 Atomic #: 13 27-13 = 14 EVERYTHING CHEMISTRY 200 Points

48. Categories EVERYTHING CHEMISTRY 300 Points Students in a lab conducted an investigation in which they added 4 different solid substances to separate beakers of water. They stirred the mixtures for one minute and then recorded their observations. Which substance most likely caused a new substance to form when added to water?

49. Categories EVERYTHING CHEMISTRY 300 Points Substance 2 – bubbles formed (chemical reaction)

50. Categories A student is studying calcium, a highly reactive element that humans need for strong bones. Which characteristic of calcium is most closely related to its chemical reactivity? A. The 20 protons in each atom of calcium B. The density of calcium, which is 1 5. g/cm3 C. The atomic mass of calcium, which is 40.078 D. The 2 valence electrons in each atom of calcium EVERYTHING CHEMISTRY 400 Points

51. Categories D. The 2 valence electrons in each atom of calcium; an atom’s # of valence electrons determines who it will react with EVERYTHING CHEMISTRY 400 Points

52. Categories Which 2 atoms are of elements from the same GROUP? EVERYTHING CHEMISTRY 500 Points

53. Categories Atoms 1 and 4 are in the same group because they have the same number of valence electrons. (6 valence electrons, Group 6A) EVERYTHING CHEMISTRY 500 Points

54. Categories The Daily Double