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4 years ago

30 Which term represents a type of nuclear reaction?

2 answers:

Taya2010 [7]4 years ago

8 0

A nuclear reaction must always conserve mass. Since natural transmutation includes the conversation of mass, it is a type of nuclear reaction.

Final answer:- <span>(4) natural transmutation</span>

77julia77 [94]4 years ago

3 0

<span>(4) natural transmutation</span>

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The gas in the piston is being heated, and the piston has moved upward. The observation will be summarized in a row of the incom

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Answer:

Explanation:

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3 years ago

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The production of ammonia (NH3) under standard conditions at 25 C is represented by the following thermochemical equation.

telo118 [61]

Answer:

Given, Heat of formation =−46.0 KJ/mole

Since, the enthalpy of formation of ammonia is the enthalpy change for the formation of 1 mole of ammonia from its element.

2NH

(g)→2N

(g)+3H

(g)

△H

reaction

=2×△H

formation

=2×−46.0 KJ/mole

Heat of reaction=−92.0 KJ/mole

Explanation:

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3 years ago

If 200 g of benzoyl peroxide are used with 38 Kg of PTFE monomer, calculate the expected molecular weight of the polymer if (i)

den301095 [7]

Explanation:

The molecular weight of benzoyl peroxide is 242.23 g/mol.

Therefore, number of moles present in 200 g of benzoyl peroxide are as follows.

No. of moles = $\frac{mass}{\text{molar mass}}$

= $\frac{200 g}{242.23 g/mol}$

= 0.825 mol

Molecular weight of PTFE is 100 g/mol.Hence, calculate the number of moles of PTFE in 38 kg as follows.

As 1 kg = 1000 g. So, 38 kg = 38000 g.

No. of moles = $\frac{mass}{\text{molar mass}}$

= $\frac{38000 g}{100 g/mol}$

= 380 mol

As it is given that the initiator is 15% active. So, actual number of moles of benzoyl peroxide are as follows.

$0.15 \times 0.826$

= 0.124 mol

For combination, 1 mol of benzoyl peroxide produces 1 chain. Therefore, degree of polymerization will be calculated as follows.

DP = $\frac{380 mol}{0.124 mol}$

= 3065.33 mol

Average molecular weight of monomer is as follows.

$\frac{0.124}{0.124 + 380} \times MW_{benzoyl} + \frac{380}{0.124 + 380} \times MW_{PTFE}$

= 100.05 g/mol

Therefore, calculate the expected molecular weight of polymer as follows.

$3065.33 \times 100.05 g/mol$

= 306675.23 g/mol

Hence, for disproportion 1 mole benzoyl peroxide produces 2 chains.

DP = $\frac{2 \times 380}{0.124}$

= 6129.03

Therefore, calculate the expected polymer weight as follows.

$6129.03 \times 100.05$

= 613209.68 g/mol

Thus, we can conclude that the the expected polymer weight is 613209.68 g/mol.

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4 years ago

1. After examining the DNA fingerprint of the victim and then the seven suspects, which

KIM [24]

Answer:

Any suspect whose DNA fingerprint matches with that of the victim committed the crime.

Explanation:

Taking a cold blood murder perpetrated by a suspect with a knife as an example. To know the real murderer among 7 suspects, A DNA fingerprint is conducted on the knife used and whoever matches with the DNA fingerprint on the knife committed the crime.

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3 years ago

Which electrons are responsible for the emission of colored lights and how is emission occurring?

densk [106]

Answer:

When the electron changes levels, it decreases energy and the atom emits photons. The photon is emitted with the electron moving from a higher energy level to a lower energy level. The energy of the photon is the exact energy that is lost by the electron moving to its lower energy level.

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3 years ago