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agasfer [191]
3 years ago
10

Black holes are the final stage of what star

Chemistry
2 answers:
nignag [31]3 years ago
8 0
“A black hole will suck in any nearby stuff it can. If a star or galaxy is rotating around a black hole this will be meta-stable with the gravity of the black hole matching the rotational acceleration of the star. Various events that produce imbalance, like interactions between different bodies and solar wind, allow the black hole to pick up the resulting debris.

Over time, the black hole will clear out it’s neighborhood. As the universe is expanding, and looks like it continue to do so indefinitely, our black hole will end up alone in a region of empty space.

Hawking radiation is a process at the “edge” of the black hole where quantum randomness results in creation of a particle and antiparticle pair on either side of the event horizon. One falls back into the black hole and the other radiates into space. This will slowly evaporate the black hole. This is a extremely slow process. It relies on the chance creation of particles pairs in a miroscopically thin surface bridging the event horizon. It has been calculated that this would take 10^67 years to evaporate a black hole with the mass of the Sun.

(Compare with the age of the universe, 10^10 years, and you can see how imperceptibly slow this process is. During your lifetime a black hole the mass of the Sun would lose way much than a microgram. By the time the black hole has radiated its mass, all stars will have long burned out, and the universe will have expanded so much that there are enormous and still increasing gaps between everything that even light will never cross.)

If the theory is right, and nothing unexpected happens in the long, long intervening time, the black hole will eventually evaporate in a final flash and all that will be left is an extremely weak radiation in apparent empty space”.
Andreyy893 years ago
4 0

Answer:

This:

Explanation:

Black holes occur when a massive star or larger reaches the final stage of it's lifespan. The star implodes and a black hole is the dying star's remains

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Grignard reactions are highly exothermic and are performed in ether solvent. There is a real risk of fire during this reaction.
AleksAgata [21]

Answer:

Ideally, extinguish the flames with a glass watch or beaker.

Explanation:

When you cover the distillation equipment with a watch glass or beaker, you reduce the oxygen content and it is completely eliminated thanks to the fire itself that consumes it. Once there is no more oxygen the fire is extinguished and it should take no more than 2 or 3 seconds to occur this situation

It is the easiest and most careful way to extinguish the fire during the Grignard reaction

8 0
3 years ago
How much work is required to lift a 0.500 kg block 18.5 m?
kipiarov [429]

Answer:

Work = 90.65 j

Explanation:

Given data:

Mass = 0.500 Kg

Distance = 18.5 m

Work done = ?

Solution:

Work = force . distance

Force = mg

Work = mg.distance

Work = mgh

Work = 0.500 Kg × 9.8 m/s²× 18.5 m

Work = 90.65 Kg .m²/s²

Kg .m²/s² = j

Work = 90.65 j

3 0
3 years ago
Balance the following equation:
Firdavs [7]

Answer: a) 2K_2CrO_4+3Na_2SO_3+10HCl\rightarrow 4KCl+3Na_2SO_4+2CrCl_3+5H_2O

b) 1 mole of SO_2 is produced.

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

The skeletal equation is:

K_2CrO_4+Na_2SO_3+HCl\rightarrow KCl+Na_2SO_4+CrCl_3 +H_2O

The balanced equation will be:

2K_2CrO_4+3Na_2SO_3+10HCl\rightarrow 4KCl+3Na_2SO_4+2CrCl_3+5H_2O

Thus the coefficients are 2, 3 , 10 , 4 , 3 , 2 and 5.

b) Oxidation: 2I-^-\rightarrow I_2+2e-^-

Reduction: SO_4^{2-}+2e^-+4H^+\rightarrow SO_2+2H_2O

Net reaction:  2I-^-+SO_4^{2-}+4H^+\rightarrow I_2+SO_2+2H_2O

When 1 mole of I_2 is produced, 1 mole of SO_2 is produced.

8 0
3 years ago
What was Anton van Lee
solniwko [45]

I would say the answer is A.

5 0
2 years ago
Why would you add boiling chips/stones to a solution that is to be refluxed? when should you add them?
anygoal [31]
Answer: Boiling chips provide surfaces on which bubbles can form as the liquid boils.

Hope this helps!
6 0
3 years ago
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