First recall that the units of density are g/cm3 or g.cm-3.
A student found that 20.0 mL of a liquid weighed 35.987 g. What is its density?
Using a jewelers balance a student found that a coin weighed 2.34 carats in air. By weighing it again submerged in water she found it had a volume of 0.034 mL. What is its density? (1 carat = 200 mg, defined)
What is the force in Newtons on the surface of water in a 10.00 x 10.00 cm square container (area = 100.0 cm2) if the pressure is 754 mmHg?
1 mmHg = 1 Torr, and 760 mmHg = 1.013 x 105 Pa
1 pascal (Pa) = 1 Nm-2 = 1 N/m2 or 1 N = (Pa)(m2)
104 cm2 = 1 m2
|Electron (e-)||-1||1/1840||9.11 x 10-28g|
|Proton (p or H+)||+1||ª1||1.67 x 10-24g|
|Neutron (n)||0||ª1||1.67 x 10-24g|
© R A Paselk
Last modified 1 September 2009