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ankoles [38]
3 years ago
14

According to the Kinetic Molecular Theory, as the volume of a gas increases: the number of particle impacts per unit area increa

ses the temperature must change the total number of particle impacts increases the number of particle impacts per unit area decreases
Chemistry
2 answers:
aliya0001 [1]3 years ago
7 0

As the volume of a gas increases <em>at constant temperature</em>, the number of particle impacts per unit area decreases.

There is the same number of impacts, but they are spread over a larger surface area.

Thus, the number of impacts per unit area decreases.

Reil [10]3 years ago
4 0

Answer: Option (d) is the correct answer.

Explanation:

According to kinetic molecular theory, particles of a gas are constantly in a random motion.

Also, there is large gap between the particles of a gas as compared to the size of molecules themselves.

So, it means that as the volume of a gas increases the number of particle impacts per unit area decreases because there is large space between molecules. Hence, less number of particles will occupy in per unit area.

Thus, we can conclude that according to the Kinetic Molecular Theory, as the volume of a gas increases the number of particle impacts per unit area decreases.

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2 years ago
How much heat in kj is released by burning 9.5 grams of methane?
tatyana61 [14]
Methane is the compound CH4, and burning it uses the reaction:

CH4 + O2 -> CO2 + H2O, which is rather exothermic. To find the heat released by burning a certain amount of the substance, you should look at the bond enthalpy of each compound, and then compare the values before and after the reaction. In methane, there are 4 C-H bonds, which have bond energy of 416 kj/mol, resulting in a total bond energy of 1664 kj/mol. O2 is 494 kj/mol. Therefore we have a total of 2080 kj/mol on the left side. On the right side we have CO2, which has 2 C=O bonds, each at 799 kj/mol each, resulting in 1598 kj/mol, and H2O has 2 O-H bonds, at 459kj/mol each, resulting in a total of 2516 kj/mol on the right hand side. Now, this may be confusing because the left hand side seems to have less heat than the right, but you just need to remember: making minus breaking, which results in a total change of 436kj/mol heat evolved.

Now it is a simple matter of find the mols of CH4 reacted, using n=m/mr.

n = 9.5/16.042 = 0.592195 mol

Therefore, if we reacted 0.592195 mol, and we produced 436 kj for one mol, the total amount of energy evolved was 436*<span>0.592195 kj, or 258.197 kj.</span>
7 0
3 years ago
A hydroelectric dam produces renewable energy for the local area. Which best explains why more hydroelectric dams are not built?
romanna [79]

Answer:

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."

Also, it affects the water quality and other use of water for humans such as recreational use.

There is also a possible chance of dams producing methane; a greenhouse gas through the organic materials in the water that is rotting.

7 0
2 years ago
What is the mass of 3.04×10^-4 mol of baking soda, NaHCO3?​
Zigmanuir [339]

Answer:

0.025536g

Explanation:

no. of mole = mass/Mr

mass = Mr ×  no. of mole

         = [23 + 1 + 12 + 3(16)] × 3.04×10^-4

         = 0.025536g

         = 0.0255g (3 significant figures)

8 0
3 years ago
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