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3 years ago

How hot is a supergiant star compared to our sun also the size

Chemistry

2 answers:

oee [108]3 years ago

8 0

Answer:

supergiant stars can have masses from 10 to 70 times greater than our sun, and when it comes to Brightness, some of them can be 30,000 times brighter than our sun. the temperature range of supergiant stars spans from around 3,450k to 20,000k.

Romashka-Z-Leto [24]3 years ago

5 0

Answer:

Stars several times more massive then the sun have a simpler, quicker, and more spectacular evolutionary sequence. Because super giants are so massive, the core temperature gets much hotter than in giants, so supergiants can fuse elements heavier than hydrogen and helium.

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White blood cells, part of the ___________ system, work closely with the ___________ system to protect us from infection and dis

Kisachek [45]

White blood cells, part of the circulatory system, work closely with the Immune system to protect us from infection and disease.

hope this helps :)

6 0

3 years ago

NO2 and N2O4 undergo the reaction shown. When a sealed

hichkok12 [17]

Answer:

Option C) The rates of the forward and reverse reactions are equal.

Explanation:

NO₂ and N₂O₄ undergo the following equilibrium reaction:

2NO₂(g) ⇄ N₂O₄(g)

That is a reversible reaction, i.e. there are two simultaneous reactions: the direct or forward reaction and the reverse reaction:

Direct reaction: 2NO₂(g) → N₂O₄(g)

Reverse reaction: 2NO₂(g) ← N₂O₄(g)

At the beginning, only NO₂(g) is in the sealed container. The NO₂ concentration is maximum, and the rate of the forward reaction is maximum.

As the reaction progresses, the concentration of NO₂ diminishes, and, consequently, the rate of the forward reaction decreases.

As soon as the N₂O₄ appears, the reverse reaction starts. At the beginning the rate is low, but as the N₂O₄ concentration increases the rate of the reverse reaction increases.

When both forward and reverse rates become equal the equilibrium has been reached. This is what is called a dynamical equilibrium.

Then, as per the choices, you have that, at equilibrium:

A) No N₂O₄ is present:

False: as explained above, at equilibrium both NO₂ and N₂O₄ are present.

B) No chemical reactions are occurring.

False: as explained above, at equilibrium both forward and reverse reaction are occurring at the same rate.

C) The rates of the forward and reverse reactions are equal.

True: as explained, this is the meaning of dynamic equilibrium.

D) The maximum number of molecules has been reached.

False: the number of molecules of each compound at equilibrium will be given by the constant of equiibrium, Keq = [N₂O₄] / [NO₂]², and this value varies with the temperature.

5 0

3 years ago

A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The cylinder

Margarita [4]

Complete Question

The diagram for this question is shown on the first uploaded image

The question to solve is shown on the second uploaded image

Answer:

The reaction is exothermic
The temperature of the water bath goes up
The piston move out
The system release energy
The amount of energy released is $\Delta E = - 287kJ$

Explanation:

From the question we are told that

The pressure is $P = 1 atm$

The amount of heat flow out of the system is $q = - 108 \ kJ$

The workdone by the system is $w = - 179 \ kJ$

The first question is to state whether the reaction is exothermic

Yes this reaction is exothermic because heat is being transferred out of the system

The second second question is to determine whether the temperature of the water goes up or down

The temperature of the water goes up because above we see that the reaction is exothermic which means that heat is being transferred from the system to the surrounding which i the water bath in this case so this then implies that the temperature of the water in the water bath would go up

The third question is to determine whether the piston moves in or out

Now since work is done by the system which would mean that its pressure would increase but we require a constant pressure of 1 atm and to achieve this the there is need for an increase in volume in order to return the pressure back to 1 atm and this can be achieved by the piston moving out

The fourth question is to determine whether this reaction releases or absorbs energy

We can determine this by looking at the first law of thermodynamics

which is stated mathematically as

$\Delta E = q + w$

Where w is the workdone by the system given in the question as (-179 kJ)

$\Delta E$ is the internal energy

q is the heat flowing out of the system which is given as (-108 kJ)

Substituting this into the question we have that

$\Delta E = -108 -179$

$\Delta E = - 287kJ$

This negative internal energy indicates that energy is been released from the system.

The fifth ask that we determine how much energy is been absorbed or released by the system

The solution is already obtained in the fourth question an it is

$\Delta E = - 287kJ$

When to understand that heat flow into a system mean that the system

gains energy in form of heat so that energy with respect to the system is positive

Also When heat i transferred out of a system it means that the system losses energy in form of heat so that energy in term of the system is negative

Note also that when an external body does work on a system that the workdone is done is positive

But when a system does work on an external body the workdone is negative

In the case of Internal energy

When energy is absorbed by a system the then that energy in terms of the system is positive

But when energy is released by the system to the surrounding then that energy is negative with respect to the system

3 0

3 years ago

A rectangular swimming pool is 6 ft deep. One side of the pool is 4.5 times longer than the other. The amount of water needed to

marishachu [46]

I don’t know but let me bless your eyes with this photo

4 0

3 years ago

Read 2 more answers

Different amounts of ice was added to several samples of water. The results are shown in the table. Which conclusion can be draw

Yakvenalex [24]

The conclusion which can be drawn from the results that more ice added caused a greater change in temperature.

<h3>Why temperature of substance changes?</h3>

Temperature of any substance will change if some amount of energy is absorbed or released by that substance in the form of heat.

If in simple water, we add some amount of ice then energy or heat from the whole mixture will released as a result of which temperature of the water decreases. And decrease in temperature will depend on the amount of added ice.

Hence, more ice added caused a greater change in temperature.

To know more about change in temperature, visit the below link:

brainly.com/question/24719561

#SPJ1

3 0

2 years ago