What is the hydronium ion concentration of a solution whose pH is 12.40?

What is a molar mass?

2. Are the reactants two elements or two simple compounds?

Can a physical or chemical change the amount of matter present

A balloon filled with 39.1 moles of helium has a volume of 876 l at 0.0'c and 1.00 atm pressure. the temperature of the balloon is increased to 38.0'c as it expands to a volume of 998 l, the pressure remaining constant.

What is the average mass of a single silicon atom in grams?

A molecule from a new organism contains adenine, cytosine, guanine, and thymine. What molecules is being looked at?

In what pH range does phenol red change from yellow to pink

Given the generic chemical reaction below write the rate of the reaction

23 For a reaction at equilibrium, which change can increase the rates of the forward and reverse reactions?

If the formula for potassium chlorate is KClO3 and the formula for magnesium fluoride is MgF2, then what isthe formula for magnesium chlorate?