The number 0.0101 has ________ significant figures. A) 2 B) 3 ...

[Sufayan.ah]

The number 0.0101 has ________ significant figures.
 
  A) 2
  B) 3
  C) 5
  D) 4
  E) 6

Question 2

Sulfur forms an ion with a charge of ________.
 
  A) 2+
  B) 2-
  C) 3+
  D) 6-
  E) 6+

Question 3

The combustion of titanium with oxygen produces titanium dioxide: Ti (s) + O2 (g)  TiO2 (s)
 
  When 0.610 g of titanium is combusted in a bomb calorimeter, the temperature of the calorimeter increases from 25.00 C to 50.50 C. In a separate experiment, the heat capacity of the calorimeter is measured to be 9.84 kJ/K. The heat of reaction for the combustion of a mole of Ti in this calorimeter is ________ kJ/mol.
  A) 2.09
  B) 4.14
  C) -311
  D) -0.154
  E) -1.98  104

Question 4

Sulfur and fluorine react in a combination reaction to produce sulfur hexafluoride:
 
  S (s) + 3F2 (g)  SF6 (g)
 
  The maximum amount of SF6 that can be produced from the reaction of 3.5 g of sulfur with 4.5 g of fluorine is ________ g.
  A) 12
  B) 3.2
  C) 5.8
  D) 16
  E) 8.0

Question 5

The bond order of a homonuclear diatomic molecule can be decreased by ________.
 
  A) removing electrons from a bonding MO or adding electrons to an antibonding MO
  B) adding electrons to a bonding MO or removing electrons from an antibonding MO
  C) adding electrons to any MO
  D) removing electrons from any MO
  E) The bond order of a homonuclear diatomic molecule cannot be decreased by any means.

[gasdhashg]

Answer to Question 1

B

Answer to Question 2

B

Answer to Question 3

E

Answer to Question 4

C

Answer to Question 5

A