Identify whether each element is a halogen, a noble gas, or nonmetal only. Astatine (At) : Nitrogen (N) : Krypton (Kr) : Chlorine (Cl) : Sulfur (S) :

Consider the total ionic equation below. 2NH+2OH+2H+SO4-->2NH4+2H2O+SO4 what are the spectator ions in this equation?

Describe the location of the positive charge of the atom in j. j. thomson's plum pudding model.

Calcium chloride is used to melt ice and snow on roads and sidewalks and to remove water from organic liquids. Calculate the molarity of a solution prepared by diluting 165 ml of 0.688 m calcium chloride to 925.0 ml.

A solution containing a mixture of 0.0379 M potassium chromate (K2CrO4) and 0.0739 M sodium oxalate (Na2C2O4) was titrated with a solution of barium chloride (BaCl2) for the purpose of separating CrO2-4 and C2O2-4 by precipitation with the Ba2 +

Magnesium has three naturally occurring isotopes. The most common, magnesium-24, accounts for nearly 80% of the magnesium found in nature. The atomic numbers and mass numbers for four different atoms are shown in the table below.

Calculate the maximum mass of carbon dioxide that could be obtained by adding excess hydrochloric acid to 15 g of calcium carbonate.

True or false: during dry weather, the water level in a small pond drops because of runoff.

Bradley hit a baseball with a bat. The baseball then hit a window and caused the window to break. Where did the energy that broke the window come from?

An observation which requieres measuresment is called

In the equation Mg (s) + O2 (g) → MgO (s) what is the reactant?