A 100.0-g sample of copper is heated from 10.0°C to 100.0°C. Determine the number of calories needed to raise the temperature of the copper from 10.0°C to 100.0°C. (The specific heat of copper is 0.0921 cal/goC).

If 200.0g of copper(ll) sulfate react with an excess of zinc metal, what is the theoretical yield of copper

Answer asap need by wednesday morning explain how a buffer works, using an ethanoic acid/sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.

Consider the story you just read. all but one of the choices below indicate that something is living.