Chemistry, 18.01.2020 05:31 rndbwls5760

Aheating curve has two flat lines, or plateaus. what does the plateau at the lower temperature represent?

a) boiling of a liquid
b) melting of a solid
c) increase in temperature of a substance
d) decrease in temperature of a substance

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Answer from: kroe417

B) Melting of a solid.

Explanation:

Kindly, see the attached image.It is known that the substance has different 3 phases (solid, liquid, and gas).By heating, the substance converted from solid phase to liquid phase passing by a plateau that represents equilibrium between the two phases.By further heating, the solid completely converted into liquid phase, then converted to gaseous phase passing by a plateau that represents an equilibrium between the liquid an gaseous phase.

The plateau at the lower temperature represent: B) Melting of a solid.

Aheating curve has two flat lines, or plateaus. what does the plateau at the lower temperature repre

Answer from: Quest

Answer: abeexplanation:

1. the question asks the most appropriate, which seems to rule out "all of the above." your choice appears to be the correct one.

2. the protocol described is good for identifying correlation, but not cause and effect. for cause/effect, you need to devise a protocol that will assign the treatment (or not) to groups that have essentially the same "demographics" with respect to all the other variables. your choice regarding control group seems appropriate. random assignment of treatment (choice d) may be appropriate also. (i think you can argue that b and d are just different descriptions of the same method.)

3. d will randomize the birds, but may not guarantee there are 10 in each group. e will do both, so seems the better choice.

comment on question 2

based on the problem statement, it seems clear that confident, attentive drivers are more likely to use daytime running lights. so, the protocol might need to be devised in such a way that the lights would be turned on or off without the driver's knowledge. (an attentive driver will figure it out.) assigning a confident, attentive driver to a group required to drive without running lights might mess with his/her confidence and attentiveness. you don't want your experiment to do that. (nor do you want the experiment to subject a driver to greater risk of accident as a consequence of driving without running lights.) experiments involving human safety are always problematic.

Answer from: Quest

listen, you cant how young you were.

"you didn't chose the stud life. the stud life chose you."

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