A Scottish chemist Thomas Graham observed and experimented with gas particles in the 1800's. He formulated a mathematical equation that describes the relationship between the mass of a gas molecule and its rate of effusion. This relationship is a

For the reaction so2 (g) + no2 (g) so3 (g) + no (g), the equilibrium constant kc is 18.0 at 1200ºc. if 1.0 mole of so2and 2.0 moles of no2 are placed in a 20.0-l container, what concentration of so3 will be present at equilibrium? a. 0.048 mol/l b.

S. How do you calculate density?

When Mendeleev started his work on organizing the elements, about how many had been discovered? about 10 well over 100 about 60 the same as today

A solid keeps its shape due to which of the following factors? Space between particles Attractive forces between particles The type of element in the solid The container it is placed in

What does it mean for a element to have a large ionization energy?

A 10 pound block of lead-210 has a half-life of 22 years. What percentage of the block still contains lead-210 after 60 years? 1.5% 15% 77% 27%

Combined gas law problem: a balloon is filled with 500.0 mL of helium at a temperature of 27 degrees Celsius and 755 mmHg. As the balloon rises in the atmosphere, the pressure and temperature drop.

1. What hypothesis could you propose about the relationship between the position of a type of atom in a molecule and the number of bonds that the atom forms? Explain your thinking.

The molality of a solution is a measure of - A - moles of solute per kilogram of solution B - moles of solute per liter of solution C - moles of solute per kilogram of solvent D - moles of solute per liter of solvent

Which technology has allowed for exploration beyond our solar system? A) space probe B) space station C) space shuttle D) space observatory