Which element has both metallic and nonmetallic properties?

(1) Rb (3) Si

(2) Rn (4) Sr

Which of the following is characteristic property of the alkaline earth metals?

What's the correct way to show carbon dioxide in the gas phase

Calculate the ph of a 0.060 m carbonic acid solution, h2co3 (aq), that has the stepwise dissociation constants ka1 = 4.3 * 10-7 and ka2 = 5.6 * 10-11.

A woman carriers her 100-newton child for a distance of 50 meters to the child's bedroom. How much work does the woman do?

9. What substance is not soluble in water, is derived from animal-based foods and synthesized by the body, and while circulating in the blood, can accumulate on the inner walls of arteries and restrict blood flow?

At 400 K, the rate of decomposition of a gaseous compound initially at a pressure of 12.6 kPa, was 9.71 Pa s-1 when 10.0 per cent had reacted and 7.67 Pa s-1 when 20.0 percent had reacted. Determine the order of the reaction.

What particles are used to form bonds

Explain how antimony is useful for humans. What is it used for?

Classify these compounds as ionic or molecular. ncl3 nabr

If 3.64g of sand is separated from 5.25g of a mixture of salt and sand what is the percentage of sand in the sample