Sterling silver is a mixture of the metals silver and copper. It is used to make jewellery. sometimes sterling silver causes green staining on skin. Which metal do you think is responsible for this?Explain why.

How many oxygen atoms are there in 3.15 moles of hcl manganese (iv) oxide, mno2

When a beta particle is emitted, the mass number of the nucleus a. decreases by one b. increases by one c. remains the same d. decreases by two

Scientists discovered fossils in several layers of the earth you see here. they found fossils of algae, snails, and clams in layer d. given that information, where do you think they found fossil evidence of simple land plants and amphibians?