If a buffer solution is 0.120 M in a weak acid (Ka = 2.0 * 10-5) and 0.440 M in its conjugate base, what is the pH?

Rank the gas molecules CO2, C2H6, H2O, He, H2 in terms of increasing rate of effusion. 1. CO2, C2H6, H2O, He, H2 2. CO2, C2H6, H2O, H2, He 3. He, H2, H2O, C2H6, CO2 4. H2, He, H2O, C2H6, CO2 5. None of these

I'm working on a P1V1=P2V2 problem. I have all the information in and is has equaled 146.686235. Would I round this to 147 or 146.69 or neither?

When layered into a single column, which water will sink to the bottom? A. cold water with no salt B. warm water with no salt C. warm, salty water D. cold, salty water

A 275-g sample of nickel at 100.0°C is placed in 100.0 g of water at 22.0°C. What is the final temperature of the water? Assume no heat transfer with the surroundings. The specific heat of nickel is 0.444 J/g·°C and the specific heat of water is 4.

How many valance electron dose an atom of oxgen have? A 6 B 4 C 2 D 8

What were some reasons why it was a good idea to remove the lid from the separatory funnel after each extraction? Select all that apply.

The half-life of iodine is 8 days. If 700.00 g sample decays to 43.75, how much time has passed

The size of a minerals crystals depends on what?

The density of gold is 19.3 g/cm3. What is the mass of 15cm3 of gold?

Which state of matter has no definite size or shape