Which of the following is an example of chemical change? a.) stirring butter and sugar together b.) adding food coloring to water c.) burning a candle d.) breaking a rock into smaller pieces

What is the number of moles in 15.0 g ash3?

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.

Draw the lewis dot structure for each of the following polyatomic ions