Chemistry, 18.07.2019 00:30 AdoNice

Asap ! a mixture of ice and water is heated from 0ºc to 5ºc in five minutes using a hot plate. the hot plate provides a constant rate of heat output during this time. choose the graph which best describes the change in temperature of the water (t) as a function of time (t), neglecting any heat loss to the environment: a) the temperature stays constant for a while, then rises (a) b) the temperature rises more slowly at first, then faster (b) c) the temperature rises more rapidly at first, then slower (c) d) the temperature rises at a constant rate (d) what is the reason for your answer to the last question, "choose the graph which best describes the change in temperature of the water (t) as a function of time (t), neglecting any heat loss to the environment"? a) it is hard to warm up something cold; it becomes easier to heat as it warms up. b) at first, the energy supplied goes into overcoming attractive forces in the solid. c) very cold things absorb heat more quickly. d) the heat output increases the thermal energy of the system at a constant rate.

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Answer 1:
Correct Option A i.e. The temperature stays constant for a while, then rises (A).

Reason:
At 0 oC, H2O exist in dual state (solid and liquid) i.e. there exist an equilibrium between ice and water. Hence, when the heat is supplied, it is initially used to bring about phase transformation from solid to liquid state. During this time, temperature remains constant. Once the phase transformation has occurred, heat is utilized for increasing the temperature of system i.e. water.

Answer 2:
Correct Option B) At first, the energy supplied goes into overcoming attractive forces in the solid.
Reason:
In the present case, initially the energy supplied goes into overcoming attractive forces in the solid. Once the ice is converted into water, it now exist in single phase i.e .liquid. Hence, now when further heat is supplied to the system, it is used only for increasing the temperature of system.

Answer from: Quest

For cyclohexane compounds drawn in a chair conformation: -axial bonds are vertical -equatorial bonds are parallel to two bonds within the ring. thus, as i assume the chair conformation is drawn: -the x group is in an axial position, as are the five other vertical bonds. -three axial bonds are on the top face of the ring -the other three axial bonds are on the bottom face the position of the second substituent on each ring carbon is equatorial. gauche groups must be on an adjacent carbon such as carbon 6 and carbon 2, and also gauche groups are rotated by 60 degrees relative to each other. drawing the newman projections for c1–c2 and c1–c6 aids in visualizing the groups that are gauche to the y group on c1. click this link and watch some academic videos that may you more understand the topic

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because of all the things that happen around the us, many people get into arguments which sadly could get physical, but we should actually make a change for that.

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Asap ! a mixture of ice and water is heated from 0ºc to 5ºc in five minutes using a hot plate. the...

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