81. What element has the electron configuration 1s²2s²2pº3s 3p?

a. nitrogen

c. silicon

b. selenium

d. silver

Draw the Lewis Structure for CH4.

Check all that apply. a. Cathode rays have mass. b. There are subatomic size particles in an atom. c. In the atom, the particles of the cathode rays are embedded in a diffuse cloud of positive charge. d.

Given that ammonia is a gas at room temperature, what can you infer about the relative strengths of the intermolecular forces between ammonia molecules and between water molecules

Why are food preservatives added to food?

What's is a logical way that you could begin to investigate why your tire had low air pressure?

100 ml oxygen at 1.75 atm and 200ml nitrogen at 0.6 atm are passed to a 500 ml vessel. Calculate the total pressure of the mixture in the vessel at same temperature

Which is the best metal to use in an alloy to increase its electrical conductivity

Ice does not need to melt into liquid water before it can return to the atmosphere as water vapor. a. True b. False

How much ice at a temperature of - 17.5 ∘C must be dropped into the water so that the final temperature of the system will be 31.0 ∘C?

Why does a gas fill completely the vessel in which it is kept?