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4 years ago

What is the main source of energy in stars?

Chemistry

2 answers:

enot [183]4 years ago

4 0

Answer:

nuclear fusion

Andrews [41]4 years ago

3 0

Answer:

<h3>Nuclear fusion. The particular type of fusion depends on the temperature, which is dictated by the mass and age of the star in question. For stars on the main sequence, the primary source is fusion hydrogen into helium via what is called the p-p (proton-proton) chain. For higher mass stars, they fuse hydrogen into helium primarily via the CNO (carbon-nitrogen-oxygen) cycle. As stars age off the main sequence, they can burn additional elements (such as helium, oxygen, silicone, etc), but these stages are much shorter.</h3>

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1. Discuss briefly system and surrounding using suitable examples, highlighting heat transfers. 14 marks

lisabon 2012 [21]

A system is a part of the physical universe defined arbitrarily for observation purposes.

Boundaries are a part of the physical universe that are around the system.

In a scientific sense, a system is a part of the physical universe whose boundaries, that is, the limit between the system and its surroundings, are defined arbitrarily for observation purposes.

A system contains at least a model, represented in a phenomenological way, and it can be isolated (no mass nor energy interactions), closed (no mass interactions) or open.

The surroundings are a part of the physical universe that are around the system.

An example is a coffee-maker, where coffee-maker the system and air represents the surroundings, the coffee-maker receives energy from a heat source to warm up itself and releases part of such energy to the air.

We kindly invite to check this question on systems and surroundings: brainly.com/question/6044762

3 0

3 years ago

What is the heaviest element that is made in nature on the periodic table

ANTONII [103]

It would be uranium

5 0

3 years ago

Read 2 more answers

How many bonding pairs in br2o

Evgen [1.6K]

There are 22 bonding parts

5 0

3 years ago

Analyzing a specific reaction Consider the following reaction: 2Mg+O2→2MgO,rate=k[Mg][O2]2 Part A What is the overall reaction o

stepladder [879]

Answer:

Explanation:

Order of in the mass action law is the coefficient which is raised to the active concentration of the reactants. It is experimentally determined and can be zero, positive negative or fractional.

The order of the whole reaction is the sum of the order of each reactant which is raised to its power in the rate law.

Thus,

For the reaction:-

2Mg+O₂→2MgO

Rate = k[Mg][O₂]²

Order w.r.t. Mg = 1

Order w.r.t. O₂ = 2

So, order of the overall reaction = 1 + 2 = 3

7 0

3 years ago

N 2 ( g ) + 3 H 2 ( g ) ⟶ 2 N H 3 ( g ) How many moles of ammonia are produced when 5 moles of hydrogen reacts with excess nitro

Dima020 [189]

The reaction ratio of hydrogen to the ammonia produced is 3:2 hence if 3 moles of hydrogen produce 2 moles of ammonia thus mathematically,
3moleH2=2mole NH3
5moleH2=?
Thus cross-multiplying
(5*2)/3= 3⅓ moles.

4 0

4 years ago