19) Larry, Darryl and Jenny are using a gas chromatograph to determine the identify of a chemical sample. They
inject the sample into the machine and then wait to see how long it takes the chemicals in their sample to move
from one end of a tube in the machine to the other end. They use this time to help them determine the identity
of the chemical in the sample,
Which is an unavoidable error in this experiment?

Which set of characteristics best describes sedimentary rock? a) largest type of rock, made of organic matter, hardest type of rock b) often contains layers, forms near sources of water, contains fossils c) least abundant type of rock, made of other rocks, made mostly of minerals d) most abundant type in earth's crust, made of magma/lava, contains no fossils

What best explains whether bromine (br) or neon (ne) is more likely to form a covalent bond? bromine forms covalent bonds because it has seven valence electrons, but neon has eight valence electrons and already fulfills the octet rule. bromine forms covalent bonds because it has many electron shells, but neon has only two electron shells and is tightly bound to its electrons. neon forms covalent bonds because it can share its valence electrons, but bromine has seven valence electrons and can gain only one more electron. neon forms covalent bonds because it has only two electron shells, but bromine has many electron shells and will lose electrons in order to fulfill the octet rule.

Approximately what wavelength of light is best absorbed by chlorophyll a