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3 years ago

How much energy is required to heat 70 g of water at 20°C to boiling

Physics

1 answer:

choli [55]3 years ago

3 0

Answer:

$Q=23,430J$

Explanation:

Hello,

In this case, since we compute the required energy via:

$Q=mC\Delta T$

Whereas m is the mass which here is 70 g, C the specific heat which for water is 4.184 J/(g°C) and ΔT is the temperature difference which is:

$\Delta T=100-20=80\°C$

Therefore, the energy turns out:

$Q=70g*4.184\frac{J}{g\°C}*80\°C\\ \\Q=23,430J$

Best regards.

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What happens when you change the number of electrons in an atom

aalyn [17]

<h2>Answer: It becomes an Ion </h2>

When an atom has gained or lost electrons (negative charge), it becomes an ion.

In this sense:

<h2>Ions are atoms that have gained or lost electrons in their electronic cortex. </h2><h2> </h2>

If a neutral atom loses electrons, it remains with an excess of positive charge and transforms into a positive ion or cation, whereas if a neutral atom gains electrons, it acquires an excess of negative charge and transforms into a negative ion or anion.

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3 years ago

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nika2105 [10]

Answer:

The object has frequency of 2 Hz and time period of 0.5 s.

Explanation:

Frequency is defined as number of oscillation per second ie back and forth swings done in single second.

Here it is given that the object oscillates 20 times in 10 seconds.

So f = $\frac{20}{10}$ = 2Hz

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3 years ago

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galina1969 [7]

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Therefore:

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3 years ago

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Airida [17]

Answer:

well..

Explanation:

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property of solid which tends to obstruct flow:

inter-particular space is small and so it's compact
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Hope this helps!

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