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jekas [21]
3 years ago
6

The heat energy required to change a unit mass of a solid into a liquid at constant temperature is called

Chemistry
2 answers:
Mekhanik [1.2K]3 years ago
7 0
The heat energy required to change a unit mass of a solid into a liquid at constant temperature is called thermal equilibrium. 

'Equilibrium' means balance, and thermal is used to define temperature. 
Nonamiya [84]3 years ago
6 0

Answer: Heat Of Fusion

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It took 55 days for a radioactivity of 1.75 x 1012 Bq to remain 0.135 Ci. What is the half-life of this radioactivity?
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From the calculations, the half life of the material is 6.5 days.

<h3>What is radioactivity?</h3>

The term radioactivity has to do with the spontaneous disintegration of a specie.

Uisng the formula;

N=Noe^-kt

N= amount at time t = 0.135 Ci or 4.995 ×10^9 Bq

No = amount initially present =  1.75 x 10^12 Bq

k = rate constant = ?

t = time taken = 55 days

Hence;

4.995 ×10^9  = 1.75 x 10^12e^-55k

4.995 ×10^9/1.75 x 10^12 = e^-55k

2.85 * 10^-3 = e^-55k

ln2.85 * 10^-3 = -55k

k = ln2.85 * 10^-3/-55

k = 0.1066 day-1

Half life = 0.693/ 0.1066 day-1

= 6.5 days

Learn more about radioactivity:brainly.com/question/1770619

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egoroff_w [7]
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What effect does removing predators have on prey?

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