Which of the following compounds contains an exception to the octet rule on the central atom? SO3 [1] BF3 [2] NO2 [3]

Which of the following statement(s) is/are correct  Sample A can be a representation of a flask containing sulfur dioxide gas. Sample B can be a representation of a flask containing carbon monoxide gas. Sample C can be a representation of a flask containing helium gas and hydrogen gas. 

The reaction of solid silicon (Si) with gaseous oxygen can be used to produce silicon trioxide. How many grams of silicon trioxide are produced in the reaction when 4.25 g of silicon reacts with 3.75 g of oxygen gas?    2Si (s) + 3O2 (g)

The following image shows interactions between molecules of ethylamines (CH3CH2NH2). From the image identify the hydrogen bonds.

Which of the following statement(s) is/are correct?  S is the symbol for sodium Au is the symbol for gold O is the symbol for oxygen 

The following image shows interactions between molecules of ethylamines (CH3CH2NH2). From the image identify the hydrogen bonds. 

Which of the following statement(s) is/are correct?    Au is the symbol for gold  Po is the symbol for potassium C is the symbol for carbon 

Determine the amount of heat released (in kilojoules) when 12.20 grams of ethane, C2H6, undergoes combustion according to the following equation: 2C2H6 (g) + 7O2 (g)

Which of these ions has the largest radius (O2-, F-, Na+, or Mg2+)?

Which of the following statement(s) is/are correct?   Ag is the symbol for silver H is the symbol for hydrogen S is the symbol for sodium