All categories

3 years ago

Why is it hard to create a completely closed system?

1 answer:

4 0

To put it simply, this law states that in a closed system, energy cannot be created or destroyed, but it can be converted from one form to another. A closed system is a system that does not interact with other systems or one that is contained.

Let’s imagine a pot of water on the stove. It has a lid, so it is not interacting with other systems, and for the purposes of this example, let’s imagine that the lid seals perfectly. When you turn on the burner, you are adding energy to the water in the form of heat. That heat will enter the water. Once it is there, it will be converted as it is absorbed by the water, which will begin to boil as a result. As the water boils, some of that energy will separate the water into gas, or steam. That steam collects on the underside of the pot lid and forms droplets that return to the water.

In reality, a pot cannot be a completely closed system. If you have boiled water, you will have seen steam escaping along the edges of the lid. It is a good thing that the pot is not perfectly closed because letting off steam is what keeps the pot from exploding as the heat, and consequently the pressure, builds. When you take the lid off a pot that is boiling, you immediately open the system and allow the heat to escape and be converted as water molecules escape into the air. If heat is constantly added to a closed system, it will build pressure as the molecules move faster and faster. Enough pressure can cause a pot to explode because all of that energy has nowhere to go and will eventually push the boundaries of the system.

While the atmosphere is not a perfectly closed system, in many ways it acts as if it were. Much of the gases on the planet will move continuously around the troposphere, creating weather. Some of those gas molecules will escape into the far reaches of the atmosphere, which is why it cannot be a closed system. But if we think about the way the gases are cycled through the ocean and the atmosphere, it is helpful to keep the law of conservation of energy in mind.

So therefore the answer is D) It is very difficult to have a system in which no outside gases enter. 

You might be interested in

When I2 and FeCl2 are mixed together, iodine (I) cannot replace chlorine (Cl) in the compound because iodine is lower on the per

Nata [24]

Answer: The given statement is true.

Explanation: If this reaction would have occurred, then this reaction would be considered as displacement reaction.

Displacement reactions are the reaction in which more reactive element displaces the less reactive element in a chemical reaction. This is based on the reactivity of elements.

Reactivity of elements is the tendency of the elements to gain or loose electrons. The reactivity decreases down the group in a periodic table.

In the given reaction, Iodine and chlorine are the elements of the same group in the periodic table and iodine lies below chlorine in the group. So, the reactivity of iodine is less than the reactivity of chlorine.

Hence, in the given reaction, iodine will not replace chlorine because it lies below in the periodic table.

$FeCl_2+I_2\rightarrow \text{No reaction}$

3 0

4 years ago

Which happens when a reversible reaction reaches a state of chemical equilibrium?

Trava [24]

Explanation:

Reversible reactions that happen in a closed system eventually reach equilibrium. At equilibrium, the concentrations of reactants and products do not change. But the forward and reverse reactions have not stopped - they are still going on, and at the same rate as each other.

5 0

3 years ago

Read 2 more answers

What do proteins act as?

Tresset [83]

Proteins are made from long chains of smaller molecules called amino acids. These long chains are folded into particular shapes. This is important in relation to how antibodies and enzymes work.

Enzymes are biological catalysts. There are optimum temperatures and pH values at which their activity is greatest. Enzymes are also proteins. If the shape of an enzyme changes, it may no longer work (it is said to have been 'denatured'). maybe right?

8 0

4 years ago

Comment on whether each of the following is a homogeneous mixture or a heterogeneous mixture: (a) air in a closed bottle, (b) ai

Colt1911 [192]

Explanation:

A mixture in which there is uniform distribution of solute particles into the solvent is known as a homogeneous mixture.

For example, sugar dissolved in water is a homogeneous mixture.

On the other hand, a mixture in which there is uneven distribution of solute particles into the solvent is known as a heterogeneous mixture.

For example, sand present in water is a heterogeneous mixture.

Comment on given situations will be as follows.

(a) Air in a closed bottle - It is a homogeneous mixture because there will be even distribution of other gases that are present in air.

(b) Air over New York City - It is a heterogeneous mixture because there will be presence of some dust particles, fog or smoke into the air. Distribution of all these particles will be uneven. This will make air over New York City heterogeneous in nature.

8 0

4 years ago

What kinds of elements form an ionic bond?

Vanyuwa [196]

Ionic bonds usually occur between metal and nonmetal ions. For example, sodium (Na), a metal, and chloride (Cl), a nonmetal, form an ionic bond to make NaCl. In a covalent bond, the atoms bond by sharing electrons. Covalent bonds usually occur between nonmetals.

5 0

3 years ago