Chemistry, 22.07.2019 02:01 morgan4411
Kind of confused here. in the early 1900s, henry gwyn-jeffreys moseley added to the development of the modern periodic table. which answer best explains how moseley started his investigations? 1. by reviewing the work of those who contributed to the previous versions of the table 2. by making an entirely new organizational scheme for the previous versions of the table 3. by analyzing the work of a select group of contributors to the previous versions of the table 4. by rejecting the work of all those who had previously developed the earlier versions of the table
Answers: 1
Chemistry, 21.06.2019 20:30, nmadrigal
In a laboratory experiment, a fermenting aqueous solution of glucose and yeast produces carbon dioxide gas and ethanol. the solution was heated by burning natural gas in a bunsen burner to distill the ethanol that formed in the flask. during the distillation, the ethanol evaporated and then condensed in the receiving flask. the flame of the burner was kept too close to the bottom of the flask and some of the glucose decomposed into a black carbon deposit on the inside of the flask. during this experiment the following changes occurred. which of these changes involved a physical change and not a chemical change? check all that apply. 1-condensation of ethanol 2-evaporation of ethanol 3- formation of carbon dioxide gas from glucose burning of natural gas 4-formation of ethanol from glucose by yeast 5-formation of a carbon deposit inside the flask
Answers: 2
Chemistry, 22.06.2019 18:00, jeepjose58
What amount of heat is exchanged when 106.2 grams of substance y goes from a liquid at 35 degrees celsius to a solid at the same temperature? melting point of substance y = 35 degrees c; δhvaporization = 3.67 j/mol; δhfusion = 3.30 j/mol. mwsubstance y = 28.22 g/mol. −12.4 j −3.51 x 102 j 1.24 x 101 j 351 j
Answers: 1
Kind of confused here. in the early 1900s, henry gwyn-jeffreys moseley added to the development of t...
English, 06.05.2020 21:18