Which of these elements had two valence electrons? hydrogen barium nitrogen Krypton bromine

How many atoms are in 4 moles of oxygen?

The reaction below demonstrates which characteristic of a base? CuSO4 (aq) + 2NaOH (aq) - >Cu (OH) 2 (s) + Na2SO4 the ability of bases to release sodium ions into solution the ability of bases to release hydrogen ions into solution the ability of a

Using the bond energies provided below, calculate δh° for the reaction ch4 (g) + 4cl2 (g) → ccl4 (g) + 4hcl (g) bond energies: c-h = 413 kj/mol, cl-cl = 243 kj/mol, c-cl = 339 kj/mol, h-cl = 427 kj/mol a. 1422 kj b. 110 kj c. 440 kj d. - 440 kj e.

BaCl2 (aq) + AgNO3 (aq) → Express your answer as a chemical equation. Enter noreaction if no precipitate is formed.

How many mL of the 3.00 M HCl stock solution is needed to prepare 250.0 mL of a 1.10 M HCl solution?

Describe a way that people might be able to solve each envioronmental problem listed below. coal mining can harm habitats and cause pollution.

A sample of methane gas occupies 4.50 gallons at a temperature of 80.0 F. If the pressure is held constant, what will be the volume of the gas at 100. degrees C?

Jack wants to know if it takes longer for warm water to freeze into ice cubes than cold water, so he performed the following experiment. Jack placed 50 mL of water in the refrigerator and allowed it to cool to a temperature of 4°C.

How to calculate average concentration

Suppose that you measure a pen to be 10.5 cm long. Convert this to meters.