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SSSSS [86.1K]
3 years ago
15

What happens to water when it warms above 4 C

Chemistry
1 answer:
xxMikexx [17]3 years ago
8 0
At 4 °C, the clusters start forming. The molecules are still slowing down and coming closer together, but the formation of clusters makes the molecules be further apart. Thus, the density of water is a maximum at 4 °C.
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750.0g of water that was just boiled (heated to 100.0/c loses 78.45KJ of heat as it cools.What is the final temperature of water
Iteru [2.4K]
  • Mass=m=750g=0.75kg
  • Q=78.45\times 10^3J=78450J
  • T_i=100°C
  • T_f=?
  • Specific heat capacity=c=4200J/kg°C

According to thermodynamics

\\ \tt\bull\rightarrowtail Q=mc\Delta T

\\ \tt\bull\rightarrowtail Q/mc=\Delta T

\\ \tt\bull\rightarrowtail \Delta T=\dfrac{78450}{0.75(4200)}

\\ \tt\bull\rightarrowtail \Delta T=24.9°C

\\ \tt\bull\rightarrowtail T_i-T_f=24.9

\\ \tt\bull\rightarrowtail T_f=100-24.9=76.1°C

4 0
2 years ago
The photoelectric effect occurs when _____ are emitted from metal when the metal is struck by light of certain frequencies.
Ainat [17]

Answer:

electrons

Explanation:

The photoelectric effect occurs when electrons are emitted from metal when the metal is struck by light of certain frequencies.

Some of the applications of this effect include photomultipliers (which are a key component in spectroscopy instruments) and night vision devices.

4 0
3 years ago
Read 2 more answers
How does hess's law use intermediate reactions to calculate the enthalpy of a desired reaction?
____ [38]
By adding the enthalpies of the intermediate reactions together to get the enthalpy of the desired reaction
7 0
3 years ago
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Different isotopes of the same element emit light at slightly different wavelengths. A wavelength in the emission spectrum of a
Inessa [10]

Different isotopes of the same element emit light at slightly different wavelengths, the minimum number of slits  is mathematically given as

N=1820slits

<h3>What minimum number of slits is required to resolve these two wavelengths in second-order?</h3>

Generally, the equation for the wave is mathematically given as

d\ sin\ (\theta\ m) \ = \ m\  \lambda

Where the chromatic resolving power (R) is defined by

R\  =\ \lambda\ / \ d \  \lambda

R = nN,

Therefore

\lambda_1 \ = \  (656.45)(1 \ * \ 10^{-9})/1mm

\lambda_1= 656.45*10^{-9}

and

\lambda_2= (656.27)(1*10^{-9})/1mm

\\\\\lambda_2= 656.27*10^{-9}m

In conclusion, the minimum number of slits is required to resolve these two wavelengths in second-order

N\ =\ \dfrac{\lambda}{m\ d\ T\ }\\\\

Therefore

N\ =\ \dfrac{656.45 \ * \ 10^{-9}}{2\ * \ (0.18*10^{-9})}

N=1820slits

Read more about slits

brainly.com/question/24305019

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7 0
1 year ago
Which of these factors influences air temperature?
Ksju [112]

Answer:

D

Explanation:

3 0
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