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Questions in chemistry

[Solved] If a chemist analyzes a 3.84g sample containing sand and table sugar, and recovers 1.43g of sand, what percent by mass of table sugar should the chemist report for this sample?

[Solved] Convert 1.00 atm of pressure to its equivalent in millimeters of mercury.

[Solved] Imagine you are a driver. If the driver travels to England for 13 hours and then flies to Indonesia for 2 hours, how old is the driver?

[Solved] What equipment and "clothing" would be needed to explore the planet Uranus?

[Solved] Very few fossils of jellyfish or their close relatives have been found. This makes it hard to trace the evolutionary history of jellyfish using the fossil record. What explains this?

[Solved] Which of the following molecules is nonpolar? A. CO B. NO C. AlCl₃ D. SO₂

[Solved] In a 2 A circuit, how much charge has passed a point after 2.5 minutes? Explain.

[Solved] What is ethane?

[Solved] How do you convert mol dm\(^{-3}\) to g dm\(^{-3}\) and vice versa?

[Solved] What is chemical energy?