A balloon contains 2500. mL of Helium at 75.00°C. When the temperature is lowered to

-25.00 °C and the pressure remains unchanged, what is the new volume?

There are three known forms of hydrogen. These forms are called A. Isotopes, B. Copies, C. Ions, of each other. Each of these forms will have the same number of A. Protons, B. Neutrons, C. Electron, but different numbers of A. Protons, B.

Calculate the vapor pressure (in torr) at 298 K in a solution prepared by dissolving 42.4 g of the non-volatile non-electrolye urea {CO (NH2) 2} in 195 g of ethanol. The vapor pressure of ethanol at 298 K is 58.9 torr.

Describe the effect of water temperature on the amount of dissolved gases in water.

When light strikes a transparent material, most of the light is absorbed or reflected. a. true b. false Is it B?

What is the [H+] of a solution if the solution has a pH = 5.373?

How many moles of aluminum do 5.6*1024 aluminum atoms represent? express your answer using two significant figures?

What is the most accurate description of compounds?

A researcher wants to test the solubility (property of being dissolved) of salt in water as the temperature of the water increases.

If you have three moles of S2, how many moles of Al2S3 can be produced?

Predict whether each of the following reactions will occur in aqueous solutions. Explain your reasoning in each case. Note: Barium sulfate and silver bromide precipitate in aqueous solutions.