1. Immunity from vaccination . lasts longer than natural immunity

only lasts for a few days

is not as effective as natural immunity

prevents disease 100 percent of the time

2. How does vaccination work?

Antibodies from donated blood are injected into the body.

A strong form of the disease is injected under the skin.

A weakened form of the disease is inhaled through the nose.

Medication that fights the disease is injected into the bloodstream.

3. Explain how Edward Jenner created a smallpox vaccine.

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.

)benzene and toluene form nearly ideal solutions. consider an equimolar solution of benzene and toluene. at 20 °c the vapour pressures of pure benzene and toluene are 9.9 kpa and 2.9 kpa, respectively. the solution is boiled by reducing the external pressure below the vapour pressure. calculate (i) the pressure when boiling begins, (ii) the composition of each component in the vapour, and (iii) the vapour pressure when only a few drops of liquid remain. assume that the rate of vaporization is low enough for the temperature to remain constant at 20 °c.

If two identical atoms are bonded, what kind of molecule is formed