Viết phản ứng hóa học chứng minh đồng là kim loại hoạt động mạnh hơn bạc

the answer is a and have a great day

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.

i think it's letter a.

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.