When a liquid evaporates

1 answer:

4 0

When a liquid evaporates, it releases heat energy into the surroundings because the molecules obtain energy ( when they are being evaporates), causing the molecules to vibrate fast and escape into the atmosphere!

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Ciencia que se encarga de las mediciones

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Answer:

La metrología es la ciencia que se ocupa de las mediciones, unidades de medida y de los equipos utilizados para efectuarlas, así como de su verificación y calibración periódica.

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3 years ago

Select the correct equalities for the units shown.

elena-14-01-66 [18.8K]

Answer

1. 1cm=10mm, 1kg=1000g and 12in=1 ft

2. 50mm=5cm

48 in =4ft

36ft=12 yd

2.5m=250cm

1000mL= 1 L

Explanation

if 1cm=10mm then 5cm=?

5×10=50mm

if 12 in =1ft then 48in=?

48/12 =4 ft

if 1m=100cm, then 2.5m=?

2.5×100= 250cm

and when know from capacity that 1000mL is equivalent to 1 liter.

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Which of the following is not a organic compound, a -corn oil b -b r o m i n e c -m e t h a n e d- protein

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A corn oil. Because oil is treated with a solvent. After that it is refined which gets rid of free fatty acids. Finally, it is sent through steam distillation to get rid of volatile organic compounds.

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What is the significance of "Er" in the diagram?

Drupady [299]

Answer:

The significance of "Er" in the diagram is :

B.) Threshold energy for reaction

Explanation:

Threshold energy : It is total amount of energy required by the reactant molecule to reach the transition state .

Activation energy : It is the excess energy absorbed by the molecules to reach the transition state.

Activation Energy = Threshold Energy - Average Kinetic Energy

This means Activation energy decreases on increasing kinetic energy

On increasing Temperature average kinetic energy of the molecule increases which reduces the activation energy and the reaction occur faster in that case.

Catalyst also reduces the Activation energy.

Er = Threshshold energy for reaction at 30 degree

Ea = Activation Energy

The given figure shows that the threshold energy decreases on increasing the temperature

Only the molecule having energy greater than Er can react to form product