7. The specific heat of an unknown metal is calculated to be 3.74 J/g °C. What is the mass of the sample if it loses 3080. J of heat during a temperature decrease of 14.8°C? Is this endothermic or exothermic?

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.

An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity ?

Answer asap need to be answered 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.