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AnnyKZ [126]
3 years ago
15

What is the enthalpy in KJ of reaction for the initial combustion if the delta H for vaporization is 75.75 KJ and the net delta

H is -700 kJ?
Write your answer to hundredths, including a negative sign if needed. Do not write the unit.
Chemistry
1 answer:
Gnesinka [82]3 years ago
4 0

Answer:

-775.75

Explanation:

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A hydroelectric dam produces renewable energy for the local area. Which best explains why more hydroelectric dams are not built?
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The dam disrupts the river wildlife and ecosystem.

Explanation:

Though it is believed that using the dam as a power generation or hydroelectric power supply generates no greenhouse gases, it, however, has many disadvantages which make it deemed not suitable or sustainable for use in the contemporary time.

Majorly, the top reason why more hydroelectric dams are not built is that "the dam disrupts the river wildlife and ecosystem."

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Question 2
Mazyrski [523]

There is an increase in the frequency of particle collisions which leads to the increased rate of the reaction.

<u>Explanation:</u>

Hydrochloric acid reacts faster with the powdered zinc than with the equal mass of zinc strips.  

Since the surface area of the Zinc particle increases when it is powdered and has more active spots when compared to less number of active sites in Zinc strips and so the number of collision between the Zinc particles and the particles of Hydrochloric acid also increases and consequently the rate of the reaction also enhances.

So there is an increase in the frequency of particle collisions.

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