Which equation represents a single replacement reaction? A)
AlCl3(aq) + 3KOH(aq) + Al(OH)3(s) + 3KCl(aq)
B)
2AlCl3(s) 2Al(s) + 3Cl2(g)
C)
2Al(s) + 3Cl2(g) → 2A1C13(s)
D)
2Al(s) + 6HCl(aq) + 2AlCl3(aq) + 3H2(g)

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.