Leslie is observing the air in a balloon. She wants to know if the air in the balloon is matter. What must be true of the air for it to be matter?

Which pair of elements have the same amount of valence electrons lithium, beryllium, sodium, magnesium

In which compound have electrons been transferred to an oxygen atom a NO2 b N2O c Na2O d CO2

What branch of chemestry studies changes in the chemical reactiojs?

Proton bombardment of plutonium-239 (Z = 94) will result in the production of a neutron and which of the following nuclides?

1. The first four-legged animals to reach land were classified as 2. Pangaea was fully formed during the late Period. Respond to the following based on your reading. W 3.

Give two reasons why a 100% yield is not obtained in actual chemical manufacturing process.

What's the symbol for nitrogen

A student performs the reduction of 4-nitrobenzaldehyde (151.12 g/mol) with sodium borohydride (37.83 g/mol) in the presence of ethanol. The student mixes 4.13 g of 4-nitrobenzaldehyde with 0.700 g of sodium borohydride and obtains 1.

Which of the following subatomic particles always has a positive charge?

Which term is described as a long, narrow depression in the ocean floor?