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alexandr1967 [171]
4 years ago
10

As a pendulum swing from its highest to its lowest position along an arc, what happens to its kinetic energy and potential energ

y
A. Both the potential energy and kinetic energy decrease

B. The potential energy decreases while the kinetic energy increases

C. The kinetic energy decreases while the potential energy increases

D. Both the potential energy and kinetic energy increase
Chemistry
1 answer:
Hatshy [7]4 years ago
5 0

Answer:

B.The potential energy decreases while the kinetic energy increases.

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When is gas behavior most ideal?
Fiesta28 [93]

Answer: so B

Explanation:

Generally, a gas behaves more like an ideal gas at higher temperature and lower pressure, as the potential energy due to intermolecular forces becomes less significant compared with the particles' kinetic energy, and the size of the molecules becomes less significant compared to the empty space between them.

3 0
4 years ago
A student dissolves 10.7 g of lithium chloride (LiCl) in 300. g of water in a well-insulated open cup. He then observes the temp
Novosadov [1.4K]

Answer:

1) Exothermic.

2) Q_{rxn}=-8580J

3) \Delta _rH=-121.0kJ/mol

Explanation:

Hello there!

1) In this case, for these calorimetry problems, we can realize that since the temperature increases the reaction is exothermic because it is releasing heat to solution, that is why the temperature goes from 22.0 °C to 28.6 °C.

2) Now, for the total heat released by the reaction, we first need to assume that all of it is absorbed by the solution since it is possible to assume that the calorimeter is perfectly isolated. In such a way, it is also valid to assume that the specific heat of the solution is 4.184 J/(g°C) as it is mostly water, therefore, the heat released by the reaction is:

Q_{rxn}=-m_{Total}C(T_2-T_1)\\\\Q_{rxn}=-(300g+10.7g)*4.184 \frac{J}{g\°C} (28.6\°C-22.0\°C)\\\\Q_{rxn}=-8580J

3) Finally, since the enthalpy of reaction is calculated by dividing the heat released by the reaction over the moles of the solute, in this case LiCl, we proceed as follows:

\Delta _rH=\frac{Q_{rxn}}{n_{LiCl}} \\\\\Delta _rH=\frac{-8580J}{10.7g*\frac{1mol}{150.91g} }*\frac{1kJ}{1000J}  \\\\\Delta _rH=-121.0kJ/mol

Best regards!

8 0
3 years ago
Compare the three types of bonds based on what happens to the Valence electrons of the atoms
MakcuM [25]
I do not know if this is the correct answer,

Ionic Bonds - Whichever two atoms give one electron to the other 

Covalent Bond - Is whenever two atoms share electrons and they go back and forth between the two

I do not know what the third type is you would have to comment and let me know and I will try to find it for you! :)
7 0
3 years ago
2 horizontal and parallel lines are intersected by 2 diagonal lines to form a triangle with exterior angles. The top angle of th
Sophie [7]

Answer:

x = 63

z = 117

x + z = 180

Explanation:

edg 2020

5 0
3 years ago
During a chemical reaction, a new ___________ is formed. what is formed
butalik [34]
During a chemical rx a new product is formed
3 0
4 years ago
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