Figure 7 shows the displayed formulae for the reaction of bromine Figure 7
H
H
H-C
H-- Br
H +
Br
Br
H-C-Br +
H
H
Table 5
shows the bond energies and the overall energy change in the reaction.
Table 5
C-H
Br — Br
C-Br
H-Br
Overall energy
change
Energy in
kJ/mol
412
193
х
366
- 51
Calculate the bond energy X for the C-Br bond.
Use Figure 7 and Table 5
(4 marks]

Idon't know hope someone you

According to arrhenius theory of acid and bases, an acid is a proton donor, while base donates hydroxyl ions. further, acid and base reacts to form salt and water.consider following example.hcl    +      h2o          →      cl-          +      h3o+here, hcl has donated a proton, hence it is an acid.now consider following reactionhcl      +      naoh            ↔      nacl      +        h2oin this reaction, hcl donates proton, hence it is acid. on other hand, naoh donates hydroxyl ion (i.e. hence it is a base.   

The answer is  d.  hydrogen