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3 years ago

Nuclear changes differ from normal chemical changes in that all nuclear changes

Chemistry

1 answer:

kogti [31]3 years ago

8 0

Answer:

(1) Nuclear reactions entail a transition in the nucleus of an atom, which normally results in the formation of a new substance. Chemical reactions, on the other hand, only involve electron rearrangement and do not involve nuclei modifications. (4) Nuclear reactions are unaffected by the element's chemical form.

Explanation:

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Which changes are evidence of a chemical reaction? drag each item to the appropriate bin?

mr Goodwill [35]

<span>Two clear solutions are mixed and form a cloudy solution, A beaker of water becomes hot to touch upon adding detergent powder to it, Bubble formation on chalk added to acid. These are the evidence of a chemical reaction.</span>

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3 years ago

The molar heat of vaporization for methane, CH4, is 8. 53 kJ/mol. How much energy is absorbed when 54. 8 g of methane vaporizes

alexandr402 [8]

Molar heat of vaporization is defined as the heat absorbed by one mole of substance to convert from liquid to gas.

<h3>How do you calculate the heat of vaporization?</h3>

The formula used to calculate the heat of vaporization is:

$\rm Q &= n \times \Delta H$

Where,

Q = Amount of Heat

n = number of moles of a substance

$\Delta H =$ molar enthalpy of fusion

Now, to calculate the moles of methane:

$\rm Moles &= \dfrac{Mass \;of\; methane }{Molar\; Mass\; of \; Methane} &= \dfrac{54.8\;g}{16\;g/mol}$

Moles = 3.425 mol

Now, 1 mol of methane absorbs = 8.53 KJ

3.425 mol of methane absorbs = $3.424 \times 8.53 &= 29.1 KJ$

Thus, the energy is absorbed till the methane vaporizes at its boiling point is 29.1 KJ.

Learn more about <u>vaporization </u>here:

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2 years ago

The earth consist of how many chemical layers ?

Pani-rosa [81]

Three. The crust, The mantle. And the core

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3 years ago

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Calculate the amount of heat energy is needed to raise the temperature of 5.00 grams of lead from 25.0 to 35.0 degrees Celsius,

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Explanation: I just did it

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3 years ago

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vodomira [7]

Answer:

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Explanation:

Sorry for bad english not my first language :(

2Na+O2-->2Na20

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3 years ago