Why are valence electrons important?

How many grams of N2 are required to produce 100.0 L of NH3 at STP?

Identify the oxidation number of carbon in the compound lithium carbonate.

In a fission reaction of U-235, there was a release of 9.20 * 1011 kJ of energy. What amount of mass in kilograms would have been lost? Recall that c = 3 * 108 m/s.

What is the number of moles of 500 liters of He gas at STP? A) 0.2 mol B) 90 mol C) 0.05 mol D) 22 mol

How many moles of nitrogen gas are in a 10.0 L container at STP? a. 0.45 moles b. 22.4 moles c. 10.0 moles d. 6.02 x 1023 moles

When a chemical reaction takes place, the number of atoms of each element in the reactants

A scientist is measuring the pressure that is exerted by each of the following gases in the atmosphere: carbon dioxide, oxygen, and nitrogen. Which term most likely describes what she is measuring?

How would you expect energy to change during a chemical reaction? A. Energy will be increased. B. Energy will be decreased. C. Energy will be converted into another form. D. Energy will be consumed.

In the formula for the compound xcl4 the x could represent

What is the main function of antibodies? A: "Remembering" the characteristics of germs that have invaded your body in the past B: Creating new white blood cells C: binding themselves to invading antigens D:Signaling your immune system that antigens