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Ipatiy [6.2K]
2 years ago
14

What is the ozone hole and how does it affect humans?

Chemistry
2 answers:
Misha Larkins [42]2 years ago
8 0
A region of marked thinning of the ozone layer in high latitudes, chiefly in winter, attributed to the chemical action of chlorofluorcarbons and other atmospheric pollutants. The resulting increase in ultraviolet light at ground level gives rise to an increased risk of skin cancer
denis-greek [22]2 years ago
6 0

Answer:

Ozone layer depletion causes increased UV radiation levels at the Earth's surface, which is damaging to human health. Negative effects include increases in certain types of skin cancers, eye cataracts and immune deficiency disorders.

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Calculate ΔH (in kJ) for the process Hg2Br2(s) → 2 Hg(l) + Br2(l) from the following information.
Ilia_Sergeevich [38]

Answer : The enthalpy change of reaction is 206.9 kJ

Explanation :

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

The given final reaction is,

Hg_2Br_2(s)\rightarrow 2Hg(l)+Br_2(l)    \Delta H=?

The intermediate balanced chemical reaction will be,

(1) Hg(l)+Br_2(l)\rightarrow HgBr_2(s)    \Delta H^o_1=-170.7kJ

(2) Hg(l)+HgBr_2(s)\rightarrow Hg_2Br_2(s)    \Delta H^o_2=-36.2kJ

First we will reverse the reaction 1 and 2 then adding both the equation, we get :

(1) HgBr_2(s)\rightarrow Hg(l)+Br_2(l)    \Delta H^o_1=+170.7kJ

(2) Hg_2Br_2(s)\rightarrow Hg(l)+HgBr_2(s)    \Delta H^o_2=+36.2kJ

The expression for final enthalpy is,

\Delta H=\Delta H^o_1+\Delta H^o_2

\Delta H=(+170.7kJ)+(+36.2kJ)

\Delta H=206.9kJ

Therefore, the enthalpy change of reaction is 206.9 kJ

8 0
3 years ago
Read 2 more answers
What is the formula for the compound copper (II) sulfate pentahydrateA. C2S3•6H2O
-Dominant- [34]

Answer:

D

copper (II) sulfate pentahydrate

==>

CuSO _{4}.5H _{2}O

8 0
3 years ago
Describe three skills people use to conduct scientific investigations
Kipish [7]
Observations, surveys, and models.
6 0
3 years ago
What property can be used to determine if a sample is a pure substance or a mixture?
Yuliya22 [10]

Answer:

Melting point

Explanation:

Pure substances have sharp melting and boiling points while impurities lower the melting point and raise the boiling point

7 0
2 years ago
Explain the process of groundwater
Anon25 [30]

Answer:

Limestone is easily eroded from above and below.

Explanation:

The Florida bedrock is largely made of limestone. Because limestone is a rock that is easily eroded, the landscape of a great part of Florida is classified as karstic.

Karstic landscapes are dotted by sinkholes, underground rivers, caves, and springs. The more acidic the groundwater or rainwater, the faster and more easily the limestone will succumb to erosion.

In this way, underground rivers, streams, runoff, rain, and underground water pooled in caves have all carved out gaps and caverns in the weak limestone bedrock.

3 0
3 years ago
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