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3 years ago

Consider the diagram below. Which statement accurately describes the diagram?

Chemistry

2 answers:

Lunna [17]3 years ago

7 0

The answer is b hope it helps u good luck

e-lub [12.9K]3 years ago

7 0

Answer: D. The temperature decreases after dissolution, and the process is endothermic.

Explanation:

Enthalpy is a thermodynamic variable defined as the flow of thermal energy in chemical processes carried out at constant pressure when the only work is pressure-volume, that is, the amount of energy that a system exchanges with its environment.

The enthalpy is related to the change of temperature in a process according to the following equation,

ΔH = - Cp ΔT = - Cp (T₂ - T₁)

where ΔH is the enthalpy change, Cp is the specific heat at constant pressure and ΔT is the variation of the temperature that happened in the process.

On the other hand, chemical reactions could be exothermic or endothermic:

An exothermic reaction is any chemical reaction that releases energy, either as light or heat. In these reactions, a negative variation of the enthalpy ΔH < 0 occurs.
An endothermic reaction is any chemical reaction that absorbs energy, usually in the form of heat, therefore ΔH > 0.

According to the explained, if the enthalpy change in the dissolution process is positive, as shown in the diagram (the final enthalpy is greater than the initial enthalpy and ΔH = H₂ - H₁ > 0), it means that an energy absorption of the medium has occurred, so the temperature (which is a physical quantity that reflects the internal energy and, therefore, the heat of a system) has decreased.

So, for the question in question, the temperature decreases after dissolution, and the process is endothermic.

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3 years ago

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3 years ago

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3 years ago

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3 years ago

What is the limiting factor in determining the accumulation of siliceous ooze/calcareous ooze, respectively?

zhannawk [14.2K]

Answer:

productivity and water depth

Explanation:

The productivity and the depth of water are both equally important as it directly affects the accumulation of biogenic sediments such as the siliceous ooze and calcareous ooze. In the equator and the coastal upwelling areas, and at the site of divergence of oceans, there occurs a high rate and amount of productivity, and these are considered to be the primary productivity.

The siliceous oozes are a good indicator of extensively high productivity in comparison to the carbonate oozes. The main reason behind this is that the silica can be easily dissolved in the surface water. On the other hand, the carbonates dissolve at a relatively lower ocean water depth, so there requires a high amount of surface productivity in order to allow these siliceous oozes to reach the ocean bottom.

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