Consider these three equations: Equation 1:
-> 2 KClis)
2 ks) + Cl2(g)
CaCl2(s) ->
Equation 2:
CaCl2(aq)
Equation 3:
CH3COCH3() ->
CH3COCH3(g)
Which of these represents a CHEMICAL change?

Name the element in group 17, period 2. (periodic table)

The melting point of sulfur is 115 °c and its boiling point is 445 °c. what state would sulfur be in at 200 °c?

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.