How many Joules of heat are needed to raise the temperature of 250. g of water from 20.5oC to 100.0oC if it takes 4.184J to raise the temperature of exactly 1 gram of water exactly 1 Celsius degree (4.184 J/(goC) is water's specific heat). (HINT: Begin with the quantity that has the unit you want and use to other quantities to cancel out unwanted units.)

You encounter a solution that is acidic and you decide to test it by adding a small amount of a strong acid. the ph lowers slightly but is approximately unchanged, and still remains acidic. what can you say about the solution? a. it is a buffer solution. b. it is not a buffer solution it is a strong acid solution. d. the solution has been neutralized. e. the solution has excess acid present

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.

What is the percentage composition of carbon in the compound ch4