Mid-Term Final Review1. The temporary answer that a scientist

uses to guide an experiment is a:ans: hypothesis

2. Scientific theories change when:ans: new evidence is found

3. The science dealing with the composition of materials and the changes which materials undergo is

ans: chemistry

4. A measure of not only the amount of matter but also of the effect of Earth’s gravitational pull on that matter.

ans: weight5. What should you do if you are unsure of a

portion of the lab you are about to do?ans: ask the teacher

6. What should ALWAYS be worn in the laboratory at ALL times?

ans: goggles/safety glasses

7. How long should you flush your eyes if you get a chemical, or think you get a chemical, in your eye?

ans: 20 minutes8. What piece of equipment is used in a water

bath to hold water to be heated?ans: beaker

9. What piece of lab equipment is used to measure volumes of liquids?

ans: graduated cylinder

10. A cube has a volume of 8.0 cm3 and a mass of 21.6 grams. The density of the cube is:

ans: 2.7 g/cm3 11. Taking an object from Earth to Mars

would most likely affect the object’s: volume; density; mass; shape; or weight.

ans: weight12. Which would have a larger ionization

energy: Mg or Mg2+

ans: Mg2+

13. In a chemical reaction, these are the things undergoing the reaction?

ans: reactant14. The simplest form a matter?

ans: the element or the atom15. The study of chemistry that involves

carbon based compounds?ans: organic chemistry

16. Which is an anion: S2- or Ca2+

ans: a-negative-ion, S2-

17. The amount of matter present?ans: mass

18. A physical property of a matter that has no defined shape but a defined volume?

ans: liquid19. A mixture known to be of a uniform

composition like air is:ans: homogeneous mixture

20. How many sig figs in 250.36?ans: 5

21. What is the answer in sig figs for 250 + 5.9

ans: 25622. What prefix means 1 000 000 x

bigger?ans: Mega-

23. What prefix means 1000 x smaller?ans: milli-

24. 2.55 x 10-5 m + 1.25 x 104 cmans: 1.25 x 102 m

25. What groups would s2 d10 p3 be:ans: Group 5A

26. What is the symbol for Mercury?ans: Hg

27. What block would Sm be found?ans: f-block

28. 4.02 x 108 / 3.2 x 10-6 = 1.25625 x 1014. What is the correct expression?

ans: 1.3 x 1014

29. What concept is defined as mass/volume?

ans: Density (g/ml)30. What type of measurement is

described as red, cool, or big?ans: qualitative measurement

31. Given an example of a quantitative measurement?

ans: anything with a number

32. What is the name of the group that contains elements like Cl and Br?

ans: halogens33. 0.125L/hr = _______cm3/min

ans: 2.08 cm3/min34. 273 K = __________ oC

ans: 0oC35. What is the equation that defines the

amount of energy in a wave?ans: Ephoton = hf

36. What is wrong with this relationship: 1 ml = 1000 Lans: 1 L = 1000 ml

37. Convert K to oC and oC to KoC = k – 273 K = oC + 273

38. To convert 125 g to _____ Kg, the conversion factor would be:ans: 1 Kg = 1000 g

39. Know the parts of John Dalton’s Theory.

40. 1/12th of a carbon atom is an:ans: amu

41. What subatomic particle has a positive charge :

ans: proton found in the nucleus.42. The number of the protons is the:

ans: atomic number43. In an element; 12C6, the 12 is the

ans: mass number

44. The weighted average mass of a sample is called the ans: atomic mass

45. An atom with the same number of protons but the number of neutron varies is called:ans: isotope

46. An atom with the same number of protons but different number of electrons is called:ans: ion

47. An atom with a mass number of 70 and an atomic number of 31, has how many neutrons?ans: 39 neutrons

48. Which number in #45 above allows you to identify the element?ans: 31, the number of protons never changes!

49. Which A Group #’s tend to form + ions exclusively?ans Group IA, IIA, and IIIA

50. Which block always fills before a transitional metal?

ans: s block51. What is the element that has the last

electron placed in the 4p3?ans: As

52. What is the element that has a filled 4s and has the 5 electrons in the 3d?

ans: Mn

53. The total possible number of electrons in any energy level is defined as:

ans: 2n2 ( n = energy level)54. Who said that the first three electrons

entering the ‘p’ sublevel must spin in the same direction?

ans: Pauli’s Exclusion Principle55. Apply Hund’s Rule.56. Write electron configurations57. Use the short hand method to write electron

configurations.

58. What is true about all elements within a Group?

ans: all have same # of valance e-

59. Is Fe3+ a cation or an anion?ans: cation (+ charged ion)

60. What is the charge of an atom?ans: neutral

61. In terms of electron configuration, what can be conclude about N, P and Bi.ans: all have the same valance configuration.

62. Identify trends in atomic radius, ionization energy and electronegativity on the periodic table.

63. Identify the s, p, d, and f block on the periodic table or from a given element.

64. A group of elements that are neutral but act as a group is called

ans: a molecule65. A molecule that carries a charge?

ans: polyatomic ion66. In Lead (III) oxide, what is the oxidation

number for lead?ans: 3+

67. What is the formula unit in #49?ans: Pb2O3

68. Shows the kind and the smallest whole number of atoms in an ionic compound?

ans: formula unit69. Name binary and ternary acids

HBrH2SO3

H2SHClO3

HNO3

HF

70. Name:a. NO

ans: nitrogen monoxideb. S3P6

ans: Trisulfur hexaphosphide71. Molecular Formula:

a. Tetrasulfur heptachlorideans: S4Cl7

72. In sulfur trioxide, how many oxygensans: 3

73. In Lead (III) oxide, what is the oxidation number for lead?

ans: 3+74. What is the formula unit in #49?

ans: Pb2O3

75. Shows the kind and number of atoms in a molecule?

ans: molecular formula76. Shows the kind and the smallest

whole number of atoms in an ionic compound?

ans: formula unit76. Name binary and ternary acids

66. Given SiCl4,

a. how many unshared pairs

ans: none

b. What is the shape?

ans: tetrahedral

c. What is the bonding angle?

ans: 109.5

d. Is the molecule polar?

ans: NO, non-polar