What is an emperical formula?

What is the total number of electron pairs shared between the two atoms in an O2 molecule? (1) 1 (3) 6 (2) 2 (4) 4

Equilibrium is established between a liquid and its vapor when A. the rate of evaporation equals the rate of condensation. B. equal masses exist in the liquid and gas phases. C. equal concentrations (in molarity) exist in the liquid and gas phases.

A gas at 255 kilopascals and 45°C has an initial volume of 2.00L. The pressure of the gas increases to 805 kilopascals as the temperature is raised to 255°C. What will be the new volume? 1.05 liters 2.28 liters 1.25 liters 0.44 liters 1.50 liters

A sample of CaCl2⋅2H2O/K2C2O4⋅H2O solid salt mixture is dissolved in ~150 mL de-ionized H2O. The oven dried precipitate has a mass of 0.24 g. The limiting reactant in the salt mixture is K2C2O4⋅H2O.

During what phase of mitosis do the chromosomes pull apart and begin to form two new cells?

What is the mass of 4.6 moles of helium gas?

In the process of ionization, what is the relationship between the second ionization energy and the third ionization energy?

What are examples of convection?

Find the mass of 1 mole of cuprous oxide, or cu2o. assume the atomic mass of copper is 64 and oxygen is 16.

Ice (H2O) melting at 273 K and 1 atm has = 6.01 kJ/mol and = 6.01 kJ/mol while water vaporizing under the same conditions has = 37.6 kJ/mol and = 40.7 kJ/mol. Why is there such a large difference between and, but not for and?