Cohesion describes water's

A particle diagram showing the composition of air would represent various gases like nitrogen, oxygen, water vapor, and carbon dioxide as spheres of different colors. The proportions between these gases would be shown by having a majority of nitrogen and oxygen spheres as they make up most of our atmosphere. The diagram may also include symbols for dust particles and particulate matter.

A particle diagram to illustrate the composition of air would visually represent the mixture of gases that comprise our atmosphere. Primarily, the atmospheric mix includes nitrogen (N₂; 78.6 percent), oxygen (O₂; 20.9 percent), water vapor (H₂O; 0.5 percent), and carbon dioxide (CO₂; 0.04 percent).

Each of these gases exist as molecules, with nitrogen and oxygen being diatomic. In other words, their molecules consist of two atoms.

In such a diagram, each type of atom would be represented as a sphere of a different color, for instance, nitrogen atoms might be blue, oxygen red, hydrogen white, and carbon grey.

The proportions would be represented by having a larger number of nitrogen and oxygen spheres compared to water vapor and carbon dioxide.

Furthermore, there might be additional entities in the diagram to represent dust particles or other environmental particulate matter suspended in the air. This allows us to get a qualitative understanding of the composition of Earth's atmosphere and mechanisms that drive gas exchange.

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A chemical reaction by definition forms new chemicals (called the products) from the initial chemicals (called the reactants). It should make sense that the identity of the products formed depends on what reactants we start with. Adding an acid to a base is an example of a chemical reaction, so we should expect to see new products. Although there is a pattern to this type of reaction, ultimately the products formed depend on what acid and what base are used.

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Answer: 250 kJ

Explanation: According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to Hess’s law, the chemical equation can be treated as algebraic expressions and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

  (1)

  (2)

Net chemical equation:

  (3)

Adding 1 and 2 we get,

  (4)

Now dividing equation (4) by 4, we get

  (4)