To categorize the elements, what reactions did mendeleev observe?
reactions of elements...
Chemistry, 10.10.2019 14:20 Naysa150724
To categorize the elements, what reactions did mendeleev observe?
reactions of elements with helium and lithium
reactions of elements with boron and beryllium
reactions of elements with nitrogen and carbon
reactions of elements with oxygen and hydrogen
Answers: 1
Chemistry, 22.06.2019 09:00
What is the percentage composition of carbon in the compound ch4
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Chemistry, 22.06.2019 12:00
What are the first two quantum numbers for the electrons located in subshell 4d? what are the first three quantum numbers for the electrons located in subshell 2s? how many electrons can be held in a sublevel l = 3? how many electrons can be held in the energy level n = 4? how many electrons in an atom can share the quantum numbers n = 4 and l = 3?
Answers: 1
Chemistry, 23.06.2019 00:30
You are attempting to recrystallize a crude product mixture. you add the appropriate amount of hot solvent and are allowing the solution to slowly cool to room temperature. however, at room temperature no crystals have appeared, which of the following methods should be used to induce crystallization? choose all correct answers. a) place the flask in an ice bath. b) swirl the contents of the flask. c) add a small seed crystal of the desired product. d) scratch the inside of the glassware using a stir rod. it can be multiple choices
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Reactions in cells take place at about a. 40°c b. 0° c. 100°c d. 60°c
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