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# Taks review obj 4 with answers

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### Taks review obj 4 with answers

1. 1.
2. 2. Properties of Matter<br />Density<br />FACT: If it floats, it is less dense.<br />
3. 3. Properties of Matter<br />Buoyancy<br />Viscosity<br />
4. 4.
5. 5. density is an intensive property of matter - it does NOT change when you change the amount or shape of the sample.<br />
6. 6.
7. 7. 4.05 g / 12.0 mL = 3.775 g/mL<br />density = mass/volume - given on the formula page of the TAKS. Mass will be given in grams. Volume will be in milliliters (mL) or liters (L). Check the units in the answers to ensure they match the mass and volume units given in the question.<br />
8. 8.
9. 9. Viscosity is resistance to flow. Think of thickness - honey vs. water. Honey is much more viscous than water.<br />A - refers to density, which is unrelated to viscosity<br />B - there is no information indicating the block will change the temperature of the solutions.<br />C - displacement involves density and is unrelated to viscosity<br />D - the time the block takes to move through the solution under the force of gravity (sinking) is dependent on viscosity, assuming the metal block is more dense than both solutions.<br />
10. 10.
11. 11. Buoyancy means floating.<br />Buoyant force is how much a fluid pushes up on things floating in the fluid.<br />Density determines buoyancy, so...<br />Density goes with buoyancy! If a question asks about buoyancy, think about density. Think about the density formula.<br />
12. 12. Periodic Table<br />
13. 13. # of protons identifies the element. Count them and find the matching atomic #.<br />
14. 14. neutrons<br />o<br />Lithium (3 protons)<br />protons<br />+ <br />electrons<br />– <br /># of protons identifies the element. Count them and find the atomic #.<br />
15. 15. Columns on the PT are known as groups.<br />Elements in the same GROUP have similar physical and chemical properties.<br />
16. 16.
17. 17. Metals tend to react with non-metals<br />Tip: When asked about groups and how they react, label each answer choice as a metal or non-metal. The answer will become obvious.<br />
18. 18.
19. 19. Number of protons determines the identity of an element. Number of protons is the atomic number.<br />
20. 20.
21. 21. Elements with similar properties are in the same GROUP (column).<br />Number of protons determines the identity of an element. Number of protons is the atomic number.<br />
22. 22.
23. 23. K is a metal (group 1)<br />metals<br />metals<br />metals/metalloid<br />nonmetals<br />Metals react with nonmetals. Label the element in the prompt as metal or nonmetal, and then all the answers as metal or nonmetal.<br />
24. 24.
25. 25.
26. 26. nonmetal - group 17<br />nonmetal - group 15<br />metalloid - group 15<br />metal - group 13<br />·Metals lose / donate / give electrons - group 1 loses electrons most readily<br />·Nonmetals gain / accept / take electrons - group 17 gains electrons most easily<br />
27. 27.
28. 28. When you see a question referring to the periodic table, refer to the one in your test! It is there to help you.<br />·Group 16 are nonmetals.<br />·Nonmetals gain / accept / take electrons - group 17 gains electrons most easily<br />
29. 29.
30. 30.
31. 31.
32. 32. a.k.a. Law of Conservation of Mass<br />
33. 33.
34. 34. reactants mass must equal products mass<br />products<br />reactants<br />+<br />=<br />+<br />
35. 35.
36. 36.
37. 37.
38. 38.
39. 39. 1) Make a table under each compound.<br />2) Count number of atoms of each element in each compound.<br />3) Make the number of atoms of each element equal on each side of the equation by using whole number coefficients where needed.<br />2 PbO2<br />Coefficient<br />You can change this.<br />Subscript<br />You CANNOT<br />change this.<br />In "3 SO2" there are 3 Sulfur and 6 Oxygen atoms.<br />
40. 40.
41. 41.
42. 42.
43. 43.
44. 44.
45. 45. Ask yourself, is it still the same thing it was before the change took place? If not, it's usually a chemical change.<br />still ice, just broken, physical<br />still sugar, just dissolved, physical<br />This milk is not milk anymore. It's gross.<br />still lead, just in liquid form, physical<br />
46. 46.
47. 47. acids = chemical changes<br /> "combining...to form hematite" = new substance = chemical<br />acids = chemical changes<br /> broken shale is still shale. <br />say this 5 times fast<br />
48. 48.
49. 49.
50. 50. Water is polar and uses its polarity to dissolve any substance that is also polar.<br />
51. 51.
52. 52.
53. 53. think: HEAT CRUSH STIR!<br />HEAT, not cool<br />NOOOOOO!<br />not a factor for solubility of a solid<br />
54. 54.
55. 55.
56. 56. pH of the mixed solution is more basic<br />not a factor in pH<br />not a factor in pH<br />not a factor in pH<br />YES<br />Only changing the concentration of H+ ions and OH- ions can change the pH of a solution.<br />