Which Group 15 element exists as diatomic molecules at STP?

(1) phosphorus (3) bismuth

(2) nitrogen (4) arsenic

Explain how to separate a mixture of sand and pebbles.

A student places a small amount of water in a glass dish and then carefully places a small paperclip on the surface of the water. The paperclip floats. What happens if the student adds a drop or two of dish soap to the water? Explain your answer.

What evidence of a chemical reaction might you see dropping an alka seltzer

How does a scientist know where on the periodic table to put a newly discovered element?

Automobile airbags produce nitrogen gas based on the reaction: 2NaN3 (s) - > 2Na (l) + 3N2 (g) a. If 2.25 g of NaN3 react to fill an air bag, how much P-V work will the N2 do against the external pressure of the 1.

Tina has a sample of gaseous water at a temperature of 400 C and a pressure of 4 atm. If Tina increases the pressure to 200 atm, will the gaseous water liquefy? Why or why not?

Label the molecular shape around each of the central atoms in the amino acid glycine. hint

Which has more atoms, 2moles of carbon or 2 moles of aluminum

At 100 degrees c, water reacts with acetic anhydride to make acetic acid. also, at 100 degrees c, water reacts with acetylsalicylic acid and reverts it to salicylic acid and acetic acid.

What is the valence electron configuration of the group 2a elements?