What is the electron configuration of an element with an atomic number of 9?

Name two parts of the water cycle in which contaminants can be introduced.

Calculate ΔE for a chemical reaction that produces 181.0 kJ of heat but does no work on its surroundings. kJ

Explain how you figure out the number of neutrons in Tellurium-128.

In two or more complete sentences explain how to balance the chemical equation and classify its reaction type. _H3PO4 + __NaBr __HBr + _Na3PO4

Magnesium metal burns in the presence of oxygen gas to produce solid magnesium oxide. You are given 4.00 grams of magnesium and an excess of oxygen gas in a tank. How many grams of magnesium oxide can be produced?

31.65 mL volume of 1.07 M Fe (NO3) 3 is mixed with 44.96 mL of 0.79M Fe (NO3) 3 solution. Calculate the molar concentration of the final solution. Save rounding until the end.

At standard pressure, during which physical change does the potential energy decrease?

How are inner and outer planets different?

What process do body cells use to divide

Recall the postulates of kinetic molecular theory read the list and check all the statements that apply to behavior of an ideal gas