Please provide short answers as to what they should do or why they have these observations. a) 'I think my separatory funnel is broken. I opened the stopcock to drain the layers and nothing happened.' b) 'I added a second volume of ether to the separatory funnel for my second extraction, but I see only one layer.' c) 'I forgot which layer is ether and which is H2O.' or 'I can't figure out which layer is aqueous.'

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.

Light waves are as they pass through the

If many scientists conduct the same or similar experiments, and all obtain similar results, a can be written, which is a generally agreed-upon statement that explains and predicts how a natural phenomenon works.