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 

Using the data below on successive ionization energies, determine what the element could be?    Number of Electrons Removed  Ionization Energies (kJ/mol)   1  600  2  1200  3  3000  4  12,000  5  13,000  6  14,500  7  15,600 

Which of these ions has the largest radius (Se2-, Br-, Rb+, or Sr2+ )? 

Use the theoretical chemical symbol below to determine is corresponding statements are true or false.    Element Z has 710 protons.  [1] Element Z has 405 neutrons.  [2] Element Z has 307 electrons.  [3]  

Which of the following statement(s) about phase transitions is/are correct? Freezing refers to the phase transition from solid to liquid Sublimation refers to the phase transition from solid to gas. Vaporization refers to the phase transition from liquid to gas.

A 36.0 g sample of an unknown metal is heated from 25oC to 35oC and 171.7 J of heat is absorbed. Use the chart below to identify the unknown metal.  

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