4. Place the following events in order for the activation process of our T Cells and B Cells 1.
2.
3.
4.
5.

T Cells secrete cytokines
T Cells become activated
Antibodies get secreted
Cell displays antigen on its surface
B Cells become activated

- aluminum and copper chloride.

- the chloride ion to separate the aluminum from the oxygen so that the aluminum can react with the copper ions (and the water molecules).

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.