39 is two fifths of what number

We are all familiar with the general principles of operation of an internal combustion engine: the combustion of fuel drives out the piston.

Which of the following acids should be used to prepare a buffer with a pH of 4.5? A. HOC6H4OCOOH, Ka = 1.0 x 10^-3B. C6H4 (COOH) 2, Ka = 2.9 x 10^-4C. CH3COOH, Ka = 1.8 x 10^-5D. C5H5COOH, Ka = 4.0 x 10^-6E. HBrO, Ka = 2.3 x 10^-9

Can Asexual reproduction involves 3 parents?

How much heat is needed to raise the temperature of 8g of water by 18oC? Your Answer:

500. mL of gas is contained at STP. The volume changes to 560 mL at 20.°C What is the pressure (in atm) ?

Explain an example of a chemical bond

What is the oxidation number of chlorine

What is a triglyceride? Draw the skeletal structure for a saturated triglyceride whose hydrocarbon tails each contain six carbons.

A 500 g block of metal absorbs 5016 J of heat when its temperature changes from 20.0 ⁰C to 30.0 ⁰C. Calculate the specific heat of the metal.

When delta h is negative the reaction will be endothermic?