How is hydrogen different from alkali metals?

What can be said about an endothermic reaction with a negative entropy change? The reaction is: a. spontaneous at all temperatures. b. spontaneous at high temperatures. c. spontaneous at low temperatures. d.

Which substances play an important role in communication between cells in a multicellular organism by acting as chemical messengers?

Which statement describes the strength of dipole-dipole intermolecular forces? Dipole-dipole forces are the weakest intermolecular force. Dipole-dipole forces are the strongest intermolecular force.

What is the hydroxide ion concentration of a lye solution that has a ph of 9.20?

Assume the atomic mass of element X is 22.99 amu. A 17.15-g sample of X combines with 14.17 g of another element Y to form a compound XY. Calculate the atomic mass of Y.

You aren't sure if your pH meter needs to be calibrated, so you put it in a buffer solution that has a known pH of 7. You take four separate readings of the solution with the pH meter. The meter reports the pH as 5.5, 8.6, 6.3, and 9.4.

Can you explain and read this equation 2Mg + 02 - - 2MgO

The label of a gas cylinder has come off in your laboratory. You know that only one species of gas is contained in the cylinder, but you do not know whether it is hydrogen, oxygen, or nitrogen.

Give two example of compound that decompose to give off oxgyen gas

How many moles of gas are contained in a rigid, sealed, 5 L container, at 1 atm of pressure and 22 oc?