What are the four classifications of matter?

of those four, which two are pure substances?

In the reaction Mg (s) + 2HCl (aq) H2 (g) + MgCl2 (aq), how many liters of hydrogen gas will be produced from 75.0 milliliters of a 3.0 M HCl in an excess of Mg at STP? a. 1.1 liters b. 34 liters c. 2.52 liters d. 0.11 liters E. 0.23 liters

Aqueous hydrobromic acid will react with solid sodium hydroxide to produce aqueous sodium bromide and liquid water. Suppose 68.0 g of hydrobromic acid is mixed with 25. g of sodium hydroxide.

What volume would 8.0g helium gas occupy at 0.0 c and 1.0 atm? How many moles of gas molecules would you expect to find in a 2.0-L bottle of air at 0.0 C and 1.0 atm? What would be the mass of gas inside a 3.0-L balloon at 0 C and 1.

At a certain temperature the vapor pressure of pure benzene is measured to be 322. torr. Suppose a solution is prepared by mixing 138. g of benzene and 91.2g of heptane. Calculate the partial pressure of benzene vapor above this solution.

What element was used to make the first atomic bomb

What is the metric unit for density

Is the compound CO ionic or covalent

What is the volume in ml of one pound of mercury?

How does the number of molecules in one mole of carbon dioxide compare with the number of molecules in one mole of water? A. There are four times as many molecules in one mole of carbon dioxide as there are in one mole of water. B.

Suppose you had 1.0 mol samples the following gases at STP. If the volume of each of the samples of gas was reduced to one tenth of its original size and the temperature remained the same, which gas would have the lowest pressure?