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3 years ago

Which of the following is an exothermic reaction?

2 answers:

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I think the correct answer among the choices listed above is option B. Condensation is a process which an exothermic one. Exothermic processes involves heat being released to the environment which is evident in the process of condensation.

Sauron [17]3 years ago

3 0

Answer: The correct answer is Option B.

Explanation:

Exothermic reaction is defined as the reaction in which heat is released to the surroundings from the system. The total enthalpy change of the reaction comes out to be negative.

Endothermic reactions are the ones where heat is absorbed from the surrounding by the system. The total enthalpy change of this reaction comes out to be positive.

For the given options:

Option A: When ammonium nitrate is added in the water to cool it, the heat is getting absorbed. Then only the water is getting cooled. Thus, it is considered as an endothermic reaction.

Option B: Condensation is a process in which gaseous state changes into liquid state. The temperature of the system gets reduced and thus heat is getting released in this process. Thus, it is considered as an exothermic reaction.

Option C: Melting is a physical process in which solid state is converted into liquid state. To do this, heat must be provided to separate the particles from one another. Thus, it is considered as an endothermic reaction.

Option D: When sugar is dissolved in water, heat is provided so that it gets completely dissolved. Thus, it is considered as an endothermic reaction.

Hence, the correct answer is Option B.

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Which is the correct Lewis dot structure of NH2?

Svetlanka [38]

Answer:

OE. E

Explanation:

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3 years ago

Imagine the movement of a single gas molecule inside a container. Explain the particles motions in terms of kinetic- molecular t

Nikitich [7]

Answer:

we know that gas molecules move fast by hitting the container and they never meet,so if we have one single gas molecule then it will move slower . This is because it is alone in an empty container so until it hits the container to change it's movements it will make the process slower.

Read the explanation below to have a better idea based on the kinetic molecular theory.

Explanation:

Hello in this question we have a container and in it is a single gas molecule. So there is our gas molecule and in fact right there that violates the kinetic molecular theory. Because the kinetic molecular theory thinks of these particles as being dimension less points. Because there is so much space between particles. The particles themselves have such an insignificant volume as they can be thought of as dimension lys points. Okay. But anyway this particle is in rapid motion and this motion is essentially random. So it's moving and it will eventually hit the wall of its container. It's moving rapidly so it's going to hit it pretty quickly and when it hits the wall of that container Yeah, it is going to bounce off when it does that. It's a totally elastic collision. So that means there will be no energy transfer, no energy loss, no energy gained. It will just serve to change the direction of the particle. So when it hits the wall it's going to bounce back off the wall and continue in a straight line until it hits another wall and then it will bounce off that wall and it will continue moving in this motion in this motion its speed is related to the amount of energy it has and therefore its temperature. So if we add heat, it will move faster. If we remove heat or cool it down, it will move slower. So when we remove heat, it will move slower. The kinetic molecular theory says it will be constantly moving As long as it is above absolute zero. It's only at absolute zero or 0 Kelvin, where would stop moving. Okay, so all these things describe its motion. It's in rapid random motion in a straight line until it hits the wall of its container. Then it will rebound without a transfer of any energy. It will be totally elastic collision. If we were to heat it up, it would move faster. If we were to cool it down, it would move more slowly, we would have to cool it all the way down to absolute zero before it would stop moving. Right, so all of these things describe its motion. In terms of that kinetic molecular theory,

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2 years ago

Consider the chemical formula for one unit of aluminum sulfate, Al2(SO4)3. How many total atoms would be present in 22 units of

EastWind [94]

Answer:

1.32×10²⁵ atoms of sulfate are contained in 22 units of it

Explanation:

1 unit = 1 mol

Al₂(SO₄)₃ → Aluminum sulfate

As 1 unit = 1 mol, 1 unit has 6.02×10²³ atoms of aluminum sulfate.

Let's make a rule of three:

1 unit of Al₂(SO₄)₃ contains 02×10²³ atoms

Then, 22 units of Al₂(SO₄)₃ must contain (22 . 6.02×10²³) / 1 = 1.32×10²⁵ atoms

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3 years ago

Which of the following elements has the highest electronegativity?

blsea [12.9K]

Answer:

B) Florine

Explanation:

Thus, fluorine is the most electronegative element.

Please mark brainliest and have a great day!

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3 years ago

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The equation is H2SO4 + 2NaOH = 2H2O + Na2SO4, Also, what is the theoretical yield of Na2SO4 in grams?

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3 years ago