Which statement about the manufacture of aluminium by electrolysis is correct?

А Aluminium ions are oxidised to aluminium by gaining electrons.

B Aluminium is extracted from its ore hematite. .

с Molten cryolite is used to dissolve the aluminium oxide.

D Oxygen is formed at the negative electrode.

Agood hypothesis includes which of the following? a: prediction b: data c: uncertainty d: conclusion

Which description best characterizes the motion of particles in a solid?

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.