Which two periods have the same number of elements

The mass concentration of a potassium chloride solution is 60 g/dm3. What is the mass of potassium chloride in 25 cm3 of this solution?

If an equilibrium mixture contains 0.54 m no2, what is the molar concentration of n2o4?

The width of a football field is 160 ft. How many meters is this?

Which statement best explains the purpose of using a mole in the measurement of matter? It is commonly used as another unit of mass. It allows chemists to deal with a large number of atoms. It is used only for studying the properties of gases.

During mitosis, one cell creates: one identical cell two identical cells one non-identical cell two non-identical cells

The metric unit of force is the A. gram. B. kilogram. C. nanometer. D. newton.

Why can endothermic reactions be spontaneous? g?

What requirements must a molecule meet in order to be considered nonpolar?

Why is water (H2O) considered the "universal solvent"?

Which notations represent hydrogen isotopes?