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Wewaii [24]
3 years ago
12

Which of the following describes nuclear fission?

Chemistry
2 answers:
valentina_108 [34]3 years ago
7 0
Good morning!

<span>It requires extremely high temperatures to begin the reaction.

</span>
While nuclear fusion involves the union of atoms, fission is the breaking of an atomic nucleus into two smaller parts. For this to happen it is necessary that the atom reaches a very high temperature.
Hugs!
kvv77 [185]3 years ago
5 0

Answer: The correct answer is its chain reactions can be initiated by neutrons.

Explanation: There are 2 types of nuclear reactions:

1. Nuclear fission reaction: In these type of reaction, one larger nuclei breaks down into two or more smaller nuclie's. Its chain reaction is initiated when the nucleus is struck with neutrons.

2. Nuclear fusion reactions: In these type of reaction, two small nuclei combine together to form a single large molecule. This type of reaction requires high temperature to occur.

Both these reactions occur due to the change in the nuclei of an atom.

From the above information, the nuclear fission chain reactions re initiated by the neutrons.

You might be interested in
A worker is told her chances of being killed by a particular process are 1 in every 300 years. Should the worker be satisfied or
Pavlova-9 [17]

Answer:

(a) Yes, he should be worried. The Fatal accident rate (FAR) is too high according to standars of the industry. This chemical plant has a FAR of 167, where in average chemical plants the FAR is about 4.

(b) FAR=167 and Death poer person per year = 0.0033 deaths/year.

(c) The expected number of fatalities on a average chemical plant are one in 12500 years.

Explanation:

Asumming 50 weeks of work, with 40 hours/week, we have 2000 work hours a year.

In 300 years we have 600,000 hours.

With these estimations, we have (1/600,000)=1.67*10^(-6) deaths/hour.

If we have 2000 work hours a year, it is expected 0.0033 deaths/year.

1.67*10^{-6} \frac{deaths}{hour}*2000 \frac{hours}{year}=0.0033 deaths/year

The Fatal accident rate (FAR) can be expressed as the expected number of fatalities in 100 millions hours (10^(8) hours).

In these case we have calculated 1.67*10^(-6) deaths/hour, so we can estimate FAR as:

FAR=1.67*10^{-6} \frac{deaths}{hour}*10^{8}  hours=1.67*10^{2} =167

A FAR of 167 is very high compared to the typical chemical plants (FAR=4), so the worker has reasons to be worried.

If we assume FAR=4, as in an average chemical plant, we expect

4\frac{deaths}{10^{8} hour} *2000\frac{hours}{year}=8*10^{-5} \frac{deaths}{year}

This is equivalent to say

\frac{1}{8*10^{-5} } \frac{years}{death}=1.25*10^{4} \frac{years}{death} =12500 \, \frac{years}{death}

The expected number of fatalities on a average chemical plant are one in 12500 years.

4 0
3 years ago
Which example is a homogenous mixture of two or more pure substances? alcohol
il63 [147K]

Answer:

Alcohol and water.

Explanation:

Alcohol and water is a homogenous mixture. because these two liquids are soluble, miscible in all composition. A homogenous mixture is a solution that has equal  composition of its components.

Irregular mixing of two liquid components have different refractive indexes. At a high temperature, it can become inhomogenous spontaneously.

A solution is a type of homogenous mixture which composed of two or more substances. In a mixture a solute is a substance, dissolves in other substance that is solvents like alcohol and water, alcohol is solute and water is a solvent.

6 0
3 years ago
What is the formula for energy change?
rewona [7]

Answer:

Below:

Explanation:

To calculate an energy change for a reaction: add together the bond energies for all the bonds in the reactants - this is the 'energy in' add together the bond energies for all the bonds in the products - this is the 'energy out.

Hope it helps....

It's Muska

5 0
2 years ago
Determine the total mass of water formed when 22.67g of NH3 reacts.
Valentin [98]
Jdusjfbehsbdbegsuxbshsudnd
5 0
3 years ago
Which of the following are examples of physical properties
Natali [406]

Answer:

The answer is maybe reactivity

5 0
3 years ago
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