What must models and theories do in order to remain valid? Provide 2 facts.

How many grams are there in 7.5x10^23 molecules of H2SO4

A 0.100 M solution of chloroacetic acid 1ClCH2COOH2 is 11.0% ionized. Using this information, calculate 3ClCH2COO-4, 3H 4, 3ClCH2COOH4, and Ka for chloroacetic acid.

What does it mean if an element has no subscript in a chemical formula?

What distance will a truck travel in 3 hours at an average speed of 50 miles per hour?

If the temperature changes by 100 K, by how much does it change in °C? 273°C 100°C 37°C - 0°C

In the reaction of magnesium with oxygen gas, a considerable amount of energy was released. This is an example of an exothermic reaction.

Why does an air bubble rise to the surface of a glass of water?

What term expresses the ratio of moles of reactants and products according to the coefficients in the balanced chemical equation? A) mole ratio B) reactant ratio C) product ratio D) yield ratio E) none of the above

What are some examples of kinetic energy

Under which conditions would the solubility of a gas be greatest? high pressure and high temperature high pressure and low temperature low pressure and high temperature low pressure and low temperature