8. A sample of cobalt (specific heat of Co=0..418 J/gºC) at 200.0°C is dropped into a calorimeter containing 50.0 mL of water at 21.1°C. The final temperature of the water/cobalt mixture was 67.1°C. What was the mass
of the sample of cobalt?
(Hint: 1 mL of water has a mass of 1 gram)

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.

An atom of lithium (li) and an atom of chlorine (cl) engage in a chemical reaction. which correctly describes the structure of the resulting chemical compound? hint: consider the class of each element. the chemical compound will have a network structure. the chemical compound will have triple bonds. the chemical compound will have a ball-and-stick structure. the chemical compound will have double bonds.

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?