The model below represents water. Y
Х
N
Based on the labels, what is the best description of this model?
A. X represents a molecule; Y represents a particle; Z represents an atom of water
B. X and Y represent atoms; Z represents a molecule of water
C. X represents an atom; Y represents a molecule; Z represents a particle of water
D. X and Y represent molecules; Z represents an atom of water

Darla claims that the first periodic table developed by mendeleev was not completely accurate, so it is not useful at all. harmony argues that it establish the periodic table we use today, making it more credible. who is correct and why? darla is correct, because a model that has any mistakes should be thrown out. darla is correct, because a good model would not need to change. harmony is correct, because mendeleev’s model had all of the information correct in the first version. harmony is correct, because mendeleev’s model made predictions that came true.

If you have 5.25 grams of methane (ch4), how many grams of co2 will you produce ?

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line