What do strong and weak acids have in common?
a. electrical current conduction
b. reaction with magnesium
c. ph paper test
d. litmus paper test

All the above

Explanation:

A. Electrical current conduction

Aqueous solutions of both strong and weak acids will conduct an electric current. Weak acids are poorer conductors because they produce fewer ions.

B. Reaction with magnesium

Both strong and weak acids will react with magnesium, although weak acids will react more slowly.

C. pH paper test

Both strong and weak acids will give a colour with pH test paper, although the colours will probably be different.

D. Litmus paper test

Both strong and weak acids will turn blue litmus red.

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.