What number would you write before water in the formula for calcium carbonate hexahydrate? 4 5 6 7

What volume of water, in mL, is needed to dissolve 1.3*103 mg of carbon dioxide gas when the partial pressure of carbon dioxide above the water is 3.7 atm at 25 °C? The Henry's constant for carbon dioxide gas in water at 25 °C is 0.034 M/atm.

Which statement correctly describes an atom of the element helium? (9) A. An atom of helium has a full outer energy level and is therefore unusually reactive. B. An atom of helium has eight electrons in its outer energy C.

Where are the most reactive nonmetal elements found on the periodic table? A. at the top of group 17 B. at the bottom of group 17 C. at the top of group 18 D. at the bottom of group 18

Calculate the molarity of a solution containing 25.0 moles of ethanol (C₂H₅OH) in enough water to make 3.5 liters of solution?

A 9.87-gram sample of an alloy of aluminum and magnesium is completely reacted with hydrochloric acid and yields 0.998 grams of hydrogen gas. Calculate the percentage by man of each metal in the alloy.

What is Charles's law? State the definition of the law in words.

The branch of chemistry that is the study of the composition, properties, and reactions of matter is called

How many moles does the mass quantity 130g of H2O have?

It requires 0.0780L of a 0.12 M HCl solution to completely neutralize 0.0280L of an unknown LiOH solution. What is the concentration of the unknown LiOH solution?

Which best describes the two ways that energy is measured A. In convection and in temperature B. In temperature and in radiation C. In radiation and in convection D. In wavelength and in temperature