1. 1st semester Chemistry Review

2. (1)
How many significant figures are in the following number:

3. (1) ANSWER
3 sig figs

4. How many significant figures are in the following number:
(2)
How many significant figures are in the following number:
5.020 x 10-4

5. (2) ANSWER
5.020 x sig figs

6. What is the answer to the following: 7000 ÷ 899
(3)
What is the answer to the following:
7000 ÷ 899

7. (3) ANSWER
7000 ÷ 899
7.78 = 8

8. What is the answer to the following: 56.245 + 2.0 =
(4)
What is the answer to the following: =

9. (4) ANSWER =
58.2

10. What is the trend for electronegativity?
(5)
What is the trend for electronegativity?

11. (5) ANSWER
Increases to the right and up. (Excluding the noble gases. The definition of electronegativity is the ability of an atom in a chemical bond to attract electrons to itself… noble gases don’t bond with anything and therefore cannot be electronegative, even though they are the furthest to the right!)

12. (6)
List the following elements in order of increasing ionization energy:
He, Li, Mn, O

13. (6) ANSWER
Li, Mn, O, He
(increases to the right and up)

14. (7)
How many electrons in fluorine determine the chemical properties of fluorine?

15. (7) ANSWER 7
Fluorine has 7 valence electrons. The valence electrons determine the chemical properties of the element.

16. (8)
What is the maximum number of energy levels that can be occupied in calcium?

17. (8) ANSWER 4
Calcium is in period 4. The period number corresponds to the energy levels that can be occupied.

18. (8) 2 points
What is the electron configuration for bromine?

19. (8) ANSWER
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5

20. (9)
What is the chemical formula for ferric hydroxide?

21. (9) ANSWER
Fe(OH)3

22. (10)
What is the chemical formula for titanium IV phosphate?

23. (10) ANSWER
Ti3(PO4)4

24. (11) 2 points
What is the name of H2SO3?

25. (11) ANSWER
Sulfurous acid

26. (12)
What is the formula for calcium bromide?

27. (12) ANSWER
CaBr2

28. (13)
Which type of element is the most reactive metal? Not just the group number.

29. (13) ANSWER
Alkali metals

30. (14)
A cation ________ electrons.

31. (14) ANSWER
loses

32. (15)
What does one mole of marbles, one mole of calcium atoms, one mole of water molecules, one mole of potatoes, and one mole of pencils have in common?

33. (15) ANSWER
All have x 1023 units

34. (16) 3 points (must show work!)
What is the mass of 2.4 x 1024 molecules of water?

35. (16) ANSWER
71.8 = 72 grams

36. (17)
What happens to electrons in a metallic bond?

37. (17) ANSWER
They are delocalized into a “sea” of valence electrons

38. (18)
Which type of elements form covalent bonds?

39. (18) ANSWER
2 or more non-metals

40. (19) 2 points
What is the molar mass of magnesium sulfate?

41. (19) ANSWER
g/mol

42. (20) 2 points
Write the nuclear notation for an element that has 20 protons, 23 neutrons, and 18 electrons

43. (20) 43 2+ Ca 20

44. (21) 2 points (don’t be lazy in your answer!)
What is the difference between an isotope and an ion?

45. (21) ANSWER
An isotope is the same element with differing numbers of neutrons. An ion is an element that has gained/lost electrons to become charged.

46. (22)
Where is most of the volume of the atom found?

47. (22) ANSWER
The electron cloud

48. (23)
How much does an electron weigh?

49. (23) ANSWER
Essentially nothing.

50. (24)
Who arranged the modern periodic table?

51. (24) ANSWER
Dmitri Mendeleev

52. (25) 3 points
Draw the Lewis structure for CO2

53. (25) ANSWER

54. (26) 3 points
Draw the Lewis structure for SO2

55. (26) ANSWER