Alpha-emitting substances, such as radon gas, can be a serious health hazard only if?
a.
they are inhaled or eaten.
b.
their radiation strikes the skin.
c.
exposure to them is external.
d.
none of the above

Which of the following statements about acidic water is true? a. acid has no effect on the h, o molecules. b. the solution contains a larger number of oh ions than h, o ions. c. the solution contains a larger number of h, o ions than qh ions. d. the solution contains an equal number of h, o ions and oh ions. none of the above e.

If there are 3.5 moles of koh, how many moles of naoh can be produced? question 1 options: a)3.0 moles naoh b)3.5 moles naoh c)1 moles naoh d)9 moles naoh

If a particle has z = 25 and 23 electrons, what is its charge?