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Ad libitum [116K]
3 years ago
10

Phoebe removes frozen vegetables from the freezer to make herself a stir-fry. She’s in a bit of a hurry, so she immerses the pla

stic bag of vegetables in a pot of warm water. As a result, the vegetables thaw in less than 15 minutes. Which sentences accurately describe the heat transfer that has taken place?
A.The plastic bag conducted heat to the vegetables.
B. The water and vegetables both lost an equal amount of heat.
C. Heat from the vegetables was transferred to the water.
D.Atoms in the vegetables began vibrating faster.
E.Water in contact with the plastic bag cooled down.
Chemistry
2 answers:
BARSIC [14]3 years ago
6 0

Answer:

A, D and E.

Explanation:

When two systems with different temperatures are in contact, they try to achieve thermal stability, which occurs when they have the same temperature. To this happens, heat must flow from the system with a higher temperature for the other.

So, the heat must flow from warm water to the vegetables. But there is a plastic bag between then, it must conduct that heat to the vegetables.

The water loses an amount of heat, and the vegetables gained the same amount of heat.

Heat is transferred from water to the vegetables.

When the vegetables receive heat, it changes the kinetic energy of its molecules: they start to vibrate faster, which makes the temperature increase.

The water is losing heat, so it's cooling down.

alexira [117]3 years ago
4 0
I think the answer would be D
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How long, in seconds, would it take for the concentration of A to decrease from 0.860 M to 0.310 M?
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Answer:

2.038 seconds.

Explanation:

So, in the question above we are given the following parameters in order to solve this question. We are given a rate constant of 0.500 s^-, initial concentration= 0.860 M and final concentration= 0.310 M,the time,t =??.

Assuming that the equation for the first order of reaction is given below,that is;

A ---------------------------------> products.

Recall the formula below;

B= B° e^-kt.

Therefore, e^-kt = B/B°.

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kt= ln B°/B.

Where B° and B are the amount of the initial concentration and the amount of the concentration remaining, k is the rate constant and t = time taken for the concentration to decrease.

So, we have; time taken,t = ln( 0.860/.310)/0.500.

==> ln 2.77/0.500.

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3 years ago
Atoms of which two elements have a combined total of 23 protons?
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A

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2 years ago
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Chlorine atoms react with methane, forming HCl and CH3. The rate constant for the reaction was determined to be 3.600×107 at 278
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<u>Answer:</u> The activation energy for the reaction is 40.143 kJ/mol

<u>Explanation:</u>

To calculate activation energy of the reaction, we use Arrhenius equation for two different temperatures, which is:

\ln(\frac{K_{317K}}{K_{278K}})=\frac{E_a}{R}[\frac{1}{T_1}-\frac{1}{T_2}]

where,

K_{317K} = equilibrium constant at 317 K = 3.050\times 10^{8}M^{-1}s^{-1}

K_{278K} = equilibrium constant at 278 K = 3.600\times 10^{7}M^{-1}s^{-1}

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R = Gas constant = 8.314 J/mol K

T_1 = initial temperature = 278 K

T_2 = final temperature = 317 K

Putting values in above equation, we get:

\ln(\frac{3.050\times 10^8}{3.600\times 10^{7}})=\frac{E_a}{8.314J/mol.K}[\frac{1}{278}-\frac{1}{317}]\\\\E_a=40143.3J/mol=40.143kJ/mol

Hence, the activation energy for the reaction is 40.143 kJ/mol

8 0
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