Why is a molecule the smallest part of a substance

Calculate the hydronium ion and hydroxide ion concentrations in human blood at 25oc

Which of the following elements has the smallest atomic size?

To identify a diatomic gas (X2), a researcher carried out the following experiment: She weighed an empty 2.2-L bulb, then filled it with the gas at 1.70 atm and 26.0 ∘C and weighed it again. The difference in mass was 4.3 g. Identify the gas.

A balloon contains 5470cm3 of gas and has a mass of 10.24g. The mass of the empty balloon is2.42g. What is the density of the gas.

The part of earth system that contains all of earths water is called

Pure aluminum metal has a density of 2.70 g/cm

A 0.250-g chunk of sodium metal is cautiously dropped into a mixture of 50.0 g of water and 50.0 g of ice, both at 08C. The reaction is 2Na (s) 1 2H2O (l) 88n 2NaOH (aq) 1 H2 (g) DH 5 2368 kJ

How many moles of N are in 0.203 g of N2O?

An atom has a charge of +1 in its nucleus. Which statement must be true in order for this atom to have no net charge? A. The one positive proton has no influence on the overall charge of the atom. B.

A chemist uses 0.25 L of 2.00 M H2SO4 to completely neutralize a 2.00 L of solution of NaOH. The balanced chemical equation of the reaction is given below. What is the concentration of NaOH that is used?