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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