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

A 110.0 ml sample of 0.20 mhf is titrated with 0.10 mcsoh. determine the ph of the solution after the addition of 440.0 ml of csoh. the ka of hf is 3.5*10-4.

The Lewis dot model of an atom has three dots. Which of the following statements is true about the atom? It has three valence electrons. It has three innermost shell electrons. It has three energy levels. It has three subshells.

What is the colour of Bromine

Of the following examples, which is likely to contain plasma? lightning ocean air the moon

What is the ph of a solution made by mixing 25.00 ml of 0.100 m hcl with 40.00 ml of 0.100 m koh? assume that the volumes of the solutions are additive. what is the ph of a solution made by mixing 25.00 ml of 0.100 m hcl with 40.00 ml of 0.

elect all of the true statements regarding chemical equilibrium. The concentrations of reactants and products are equal. The concentrations of reactants and products remain constant. Reactants are being converted to products and vice versa.

Is dew forming on a leaf a physical or chemical change?

What are some examples of density?

A 0.110 mol sample of an ideal gas occupies 3.50l. what is the volume of 0.250 moles of this gas at the same temperature and pressure?

Give an example of an industry i n which Chemistry is used and explain how it is.