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3 years ago

What is evaporation? Describe what happens at the molecular level during evaporation.

1 answer:

6 0

Evaporation happens when atoms or molecules escape from the liquid and turn into a vapor. Not all of the molecules in a liquid have the same energy. Sometimes a liquid can be sitting in one place (maybe a puddle) and its molecules will become a gas. That's the process called evaporation. It can happen when liquids are cold or when they are warm. It happens more often with warmer liquids. You probably remember that when matter has a higher temperature, the molecules have a higher energy. When the energy in specific molecules reaches a certain level, they can have a phase change. Evaporation is all about the energy in individual molecules, not about the average energy of a system. The average energy can be low and the evaporation still continues.

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How would you define balanced force if you were explaining it to a friend?

MakcuM [25]

Answer:

Balanced forces are those two forces acting in opposite directions on an object, and they are equal in size. Anytime if there is a balanced force on an object, the object stays still or it continues moving at the same speed and in the same direction is called a balanced force.

Explanation:

3 0

2 years ago

Explain why a change in the position of a substituent group (i.e., which carbon the group is attached to) can, but does not alwa

DedPeter [7]

Changing the position of the substituents in an organic molecule will often result in a different chemical compound. If the structure of the molecule changes but it still has the same molecular formula, i.e., the same number of each atom, then this is called a structural isomer. However, it is possible to change the position of a substituent and the structure of the molecule remain unchanged. This would most likely occur in symmetric molecules.

CH₃ - CH₂ - CH₂ - CH₂ - OH 1-butanol

CH₃ - CH₂ - CH - CH₃ 2 - butanol
|
OH

Looking at the two structures above, the position of the -OH was moved from the 1-carbon to the 2-carbon, resulting in two different molecules. These are structural isomers. However, we can also move the -OH group without changing the molecule.

CH₃ - CH₂ - CH - CH₃ 2-butanol
|
OH
CH₃ - CH - CH₂ - CH₃ 2-butanol
|
OH
In the above structure, it appears that the -OH group was moved from the 2-carbon to the 3-carbon, but since this molecule is symmetrical, the 2- and 3-carbons are equivalent. Therefore, swapping substituents has no effect on the structure of the molecule and these are equivalent.

4 0

4 years ago

Select the fastest way to differentiate between the organic and aqueous layers of an extraction.a. Hold a white piece of paper b

valentinak56 [21]

Answer:

b. Add a few drops of one of the layers to a test tube containing 1 mL of water. Shake the test tube to determine the solubility of the layer in water

Explanation:

Option a is not true, it depends on the compound being extracted.

Option c is not true, although most of the solvents used in extractions have lower boiling point than water there are exceptions, for example toluene.

Option d is not true. Again most of the solvents used in extractions are less dense than water, there are many exceptions, for example chloroform, so for equal volumes the chloroform layer will weigh more.

Option b. is the correct one.

One will test the miscibility of the layer in water. If it inmiscible then one would know is the organic layer. If it is the aqueous layer then it will completely be miscible.

6 0

3 years ago

_Al(s) + - 02(g) → _Al2O3 (s) Balance equation

AfilCa [17]

Explanation:

Chemical reaction

When two or more substances react and form some new substance it is called as chemical reaction .

For example :

Al (s) + O₂ (g)----> Al₂O₃(s)

Chemical equation

It is the representation of chemical reaction in terms of symbols ,molecular formulas ,moles , states etc .

As we know all chemical reaction obeys law of chemical combination therefore chemical reaction need to be balanced .

Law of conservation of mass

Mass can neither be created nor be destroyed in a chemical reaction , it is always conserved .That is why reactions need to be balanced .

Let us balance

Al (s) + O₂ (g)----> Al₂O₃(s)

After balancing , it becomes :

2Al (s) + 3/2O₂ (g)----> Al₂O₃(s)

6 0

3 years ago

Elzmall.org Bookmark

soldier1979 [14.2K]

I believe the answer is PD 6

4 0

3 years ago