Students of diffrent ages were given the same jigsaw puzzle to put together. They were timed to see how long it took to finish the puzzle

Why is radon gas dangerous at high levels?

Which of the following statements is TRUE? A) A covalent bond is formed through the transfer of electrons from one atom to another. B) A pair of electrons involved in a covalent bond are sometimes referred to as "lone pairs.

If 1.00 mol of argon is placed in a 0.500-l container at 22.0? c, what is the difference between the ideal pressure (as predicted by the ideal gas law and the real pressure (as predicted by the van der waals equation? for argon, a=1.

Increasing the amount of water in which the sugar is dissolved will increase the frequency of collisions between the sucrose molecules and the water molecules resulting in an increase in the rate of hydrolysis. True or false?

According to ale Chatelier's principle, what happens to the equilibrium constant when the concentration of the reactants is doubled?

How many electrons does fluorine have? How many electron shells? How many electrons are needed to fill the valence shell?

What is the concentration of h + in a 0.150 m solution of the diprotic acid h2x? for h2x, ka1=4.5*10-6 and ka2=1.2*10-11?

What is the importance of flame test in laboratory?

What's the electron configuration of an N-3 ion

If 13.5 moles of oxygen are reacted with an excess of ammonia, how many moles of NO and of H2O are formes given the following equation. 4NH3+5O2 = 4NO + 6H2O