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3 years ago

Sort the items based on whether they have gravitational potential energy,elastic energy, or chemical potential energy

Chemistry

2 answers:

k0ka [10]3 years ago

7 0

1. Rubber band: elastic potential energy
2. Spring: elastic potential energy
3. Roller coaster: gravitational potential energy
4. Rabbit: chemical potential energy
5. Hamburger: chemical potential energy

icang [17]3 years ago

4 0

Explanation:

Energy possessed by a body in a gravitational field due to its position is known as a gravitational potential energy.

Elastic energy is defined as the potential mechanical energy stored in an object because of which the object can be stretched or compressed.

Chemical potential energy is defined as the energy present inside the bonds of a substance.

Therefore, given items are sorted as follows.

A rubber band wrapped around a bundle of papers - elastic energy.

A spring - elastic energy.

A roller coaster car at the top of the first hill - gravitational potential energy.

Grass that a rabbit eats - chemical potential energy.

A hamburger - chemical potential energy.

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Identify the molecule with the highest boiling point. C 6H 6 NH 3 OF 2 CHCl 3

lakkis [162]

Answer:

Option NH 3 is the correct answer.

Explanation:

A molecule which has hydrogen bonding will have the highest boiling point. So, out of the given options only NH 3 will have hydrogen bonding.

Whereas in CHCI 3 there will be dipole-dipole interactions and no hydrogen bonding within the molecule.

In OF 2 and C 6H 6, there will be dipole-dipole interaction in both the molecules.

Thus, we can conclude that NH 3 will have the highest boiling point.

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4 years ago

Nitrogen gas at 300 k and 200 kpa is throttled adiabatically to a pressure of 100 kpa if the change in kinetic energy is negligb

erastovalidia [21]

Answer:

The temperature of the Nitrogen after throttling is $T_2 = 300 \ K$

Explanation:

From the question we are told that

The temperature is $T_1 = 300 \ K$

The pressure is $P = 200 \ kPa = 200 * 10^{3} \ Pa$

The pressure after being $P_1 = 100 \ kPa = 100 * 10^{3} \ Pa$

Generally from the first law of thermodynamics we have that

$Q - W = \Delta U + \Delta K$

Here $\Delta U$ is the change internal energy which is mathematically represented as

$\Delta U = C_p (T_2 - T_1)$

Here $C_p$ is the specific heat of the gas at constant pressure

$\Delta K$ is the change kinetic energy which is negligible

Q is the thermal energy which is Zero for an adiabatic process

W is the work done and the value is zero given that the gas was throttled adiabatically

$0= \Delta U +0$

=> $\Delta U = 0$

=> $(T_2 - 300) = 0$

=> $T_2 = 300 \ K$

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3 years ago

Does the lewis structure depict a neutral molecule or an ion? does the lewis structure depict a neutral molecule or an ion? the

Lina20 [59]

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4 years ago

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Hippuric acid (HC9H8NO3)(HC9H8NO3), found in horse urine, has pKa=3.62pKa=3.62. Part A Calculate the pHpH in 0.140 MM hippuric a

Oxana [17]

Answer:

The pH in 0.140 M hippuric acid solution is 2.2.

Explanation :

Dissociation constant of the acid = $K_a$

$pK_a=-\log[K_a]$

$3.62=-\log[K_a]$

$K_a=2.399\times 10^{-4}$

Concentration of hippuric acid = c = 0.140 M

$HC_9H_8NO_3\rightleftharpoons C_9H_8NO_{3}^-+H^+$

Initially

c 0 0

At equilibrium

(c-x) x x

Concentration of acid = c $[HC_9H_8NO_3]=0.140 M$

Dissociation constant of an acid is given by:

$K_a=\frac{[C_9H_8NO_{3}^-][H^+]}{[HC_9H_8NO_{3}]}$

$K_a=\frac{x\times x}{(c -x)}$

$2.399\times 10^{-4}=\frac{x\times x}{(0.140 -x)}$

Solving for x:

x = 0.005677 M

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The pH of the solution :

$pH=-\log[H^+]$

$pH=-\log[0.005677 M]=2.246\approx 2.2$

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4 years ago

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Thus, immune and circulatory are two organ systems that are involved in the recovery of the infection.

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4 years ago

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