What causes the properties of elements in a group to be similar?

Pure substance definition is?

Calculate the concentration of all ions present in each of the following solutions of strong electrolytes. a. 0.100 mole of Ca (NO3) 2 in 100.0 mL of solution

To what pressure would you have to compress 48.0 L of oxygen gas at 99.3 kPa in order to reduce its vol- ume to 16.0 L?

How do i get density?

What is a saturated solution? a solution with as much dissolved solute as it can hold at a given temperature. a heated solution with more dissolved solute than it can hold at a lower temperature.

U human ear is measured in?

Is the earth older than any of the rock layers.

Problem page liquid hexane reacts with gaseous oxygen gas to produce gaseous carbon dioxide and gaseous water. what is the theoretical yield of water formed from the reaction of of hexane and of oxygen gas?

Calculate the mass percent of a NaCl solution in which 140g of NaCl is dissolved in 4.50L of water at 25C (density = 0.997g/mL).

The vapor pressure of 25 milliliters of water at 25 degrees celcius will be the same as