2 The melting and boiling points of the group 1 elements are shown in the table below.
Group 1
Melting point
(°C)
282
Boiling point
(°C)
1342
Li
Na
98
???
K
???
760
Rb
39
686
One melting point in the table is missing. Which of the following temperatures is it most
likely to be?
63°C
B 42°C
C 100°C
D 232°C

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-

yes

ya te ayud espera

the correct answer would be b. amelia, because the particals of gas move really fast (charged particals) and gas also has a lot of room (particals move independently) so the only answer that has both of those is amelia's.