Radium-221 has a half-life of 30 s. how long will it take for 95% of a sample to decay

Which of the following reactions is possible according to Dalton's atomic theory? View Available Hint (s) Which of the following reactions is possible according to Dalton's atomic theory? N2→O2 N2+O2→2NO CO2→NO2 H2O→H2S

Energy in an ecosystem flow from consumers to producers. True of False

If the pKa value for a given acid is low, what does that say about the acid (is it weak or strong) ?

Which of the following is not a fossil fuel? Coal. Wood. Natural gas. Oil.

A closed container is filled with oxygen. the pressure in the container is 225 kpa. what is the pressure in millimeters of mercury?

Is ice cream a mechanical mixture or solution why?

Which term is used to describe the attraction that an oxygen atom has for the electrons in a chemical bond?

Suppose you wanted to dissolve 109 g of sodium carbonate in enough water to make 6.00 L of solution. What is the molarity of this solution?

0.0055 in scientific notation

Mineral oil dissolves in hexane but not in ethanol