Which one of the following observations would demonstrate that a substance is a mixture? Heating the substance causes it to melt, and then to boil. It cannot be separated into simpler substances by physical or chemical methods. It can be separated into simpler substances by physical methods. It cannot be separated into simpler substances by physical methods, but it can be separated into simpler substances by chemical methods.
Answers: 1
Chemistry, 22.06.2019 13:10
The last few miles of the marathon are the most difficult for heather, her hair plastered to her head, sweat clinging to her arms, and her legs already feeling as if they had nothing left, just dead weight. after grabbing a cup of ice water, she feels the ice cubes smash against her nose as she gulps some cool refreshment and keeps on running. in these last few miles, the breeze kicks up and she finally feels some coolness against her skin. drips of sweat, once clinging to her forehead, now spill down, and heather feels more pain as the sweat flows into her eyes.which of the following is the most likely reason why the ice struck heather’s nose when she took a drink? a) water can function as a solvent. b) water can store large amounts of heat. c) water can moderate temperatures through evaporative cooling. d) the density of water decreases when it freezes. e) water has a cohesive nature.sweat remained on heather’s forehead and arms because of the a) high salt content of sweat b) cohesive nature of water c) ability of water to moderate heat d) high evaporative cooling effect of water e) ability of water to act as a solvent
Answers: 1
Chemistry, 22.06.2019 16:00
Click the button that shows the correct relationship of the electron affinities of the elements sodium and phosphorus. sodium’s electron affinity value is more negative than the electron affinity value of phosphorus. phosphorus’ electron affinity value is more negative than the electron affinity value of sodium. this information cannot be determined using the periodic table. answer is b on e2020.
Answers: 3
Chemistry, 23.06.2019 00:30
The molecular weight of carbon dioxide, co2, is 44.00 amu, and the molecular weight of nitrous dioxide, no2, is 46.01 amu, so no2 diffuses co2
Answers: 2
Which one of the following observations would demonstrate that a substance is a mixture? Heating the...
Computers and Technology, 24.12.2019 15:31
Chemistry, 24.12.2019 15:31
Mathematics, 24.12.2019 16:31
Mathematics, 24.12.2019 16:31
Mathematics, 24.12.2019 16:31
English, 24.12.2019 16:31
Mathematics, 24.12.2019 16:31