I need help with these 2 questions I have only a few minutes left
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Chemistry, 22.06.2019 05:30
Astudent carefully transfers 30 g of water and 30 g of alcohol in a glass tube, forming two layers and filling the tube completely. after sealing the tube, the student mixes the solutions, and notices a bubble that forms in the tube. what is the mass of the contents in the glass tube after mixing?
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Chemistry, 23.06.2019 02:00
What are fossils of organisms that existed over a wide area but only for a limited time period called?
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