Which Group 15 element exists as diatomic molecules at STP?

(1) phosphorus (3) bismuth

(2) nitrogen (4) arsenic

what is the most likely pH of apple juice?

The gradual changes in radioactive elements enable archaeologists to use carbon-dating techniques to understand the past. Carbon-dating techniques rely heavily on what scientific discipline?

An element is matter that is composed of one type of (atom/quark). 8. the unit of measurement used for atomic particles is the (atom size/atomic mass unit). 9.

Which statement about a methyl functional group is correct? 1) a methyl group consists of a carbon bonded of three hydrogen atoms 2) a methyl group is polar 3) a methyl group may be negatively charged

Water is an example of a

Explain why glacial deposits have been found in Africa?

Which of the following would result in butyl phenyl ether as the major product? a. Reaction of phenoxide with 1-bromobutane b. Reaction of 1-butanol with bromobenzene c. Reaction of phenyl magnesium bromide with 1-butanol d.

A 200-gram sample of a radioactive nuclide is left to decay for 60 hours. At the end of 60 hours, only 25 grams of the sample is left. What is the half-life of the nuclide sample? 60 hours 30 hours 40 hours 20 hours - - - > I think 20?

What is the symbolic formula for acetocholine?

How many hydrogen atoms are present in a hydrocarbon chain of five carbon atoms with two double bonds and two single bonds? 10 6 8 12?