An antique coin is a mixture of silver and copper. the coin has a mass of 1.155 10-2 kg and in water weighs 0.1011 n. determine the mass of silver in the coin. use 1.05 104 kg/m3 as the density of silver, 8.89 103 kg/m3 as the density of copper, and 1000 kg/m3 as the density 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.

Which of the following is not a good technique for managing used oil? a) have specific, labeled catch pans available for technicians who are collecting oil b) spills in your shop and any releases on pavement or outside should be poured down a drain c) do not use oil containers for antifreeze or other non-similar fluids d) be prepared for oil spills with the proper absorbents

Why is permeable soil best for plants that need a lot of drainage?