Question Video: Determining the Container with the Greatest Concentration | Nagwa Question Video: Determining the Container with the Greatest Concentration | Nagwa

# Question Video: Determining the Container with the Greatest Concentration Physics • Second Year of Secondary School

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Which of the following represents the container that holds particles at the greatest concentration? All the containers have equal volumes. [A] Option A [B] Option B [C] Option C [D] Option D [E] The concentration is the same for each container.

02:04

### Video Transcript

Which of the following represents the container that holds particles at the greatest concentration? All the containers have equal volumes.

To answer this question, let’s start by thinking about the term “concentration.” Concentration is a measure of how much of a substance is contained within a certain volume. For instance, if a large number of gas particles is contained within a given volume, then that gas is at a greater concentration than if a smaller number of particles were contained within the same volume.

In this question, we’ve been given four containers that are all the same volume and each contains some fluid particles. Now, because the containers all have the same volume, the container that holds the particles at the greatest concentration is simply the container that holds the most particles. If we count the number of particles in options (B), (C), and (D), we see that there are seven particles in each container. Therefore, these containers all hold the particles at the same concentration: seven particles per container.

Looking at these options, we might notice that they appear somewhat different to each other. In option (C), the particles are spread throughout the whole container. But in options (B) and (D), the particles are more tightly packed together in a certain spot. Because of this, we might think that the gasses in these containers are at different concentrations.

However, in this question, we are asked to think about the overall concentration of the particles in the whole container, and not just the part of the container that the gas happens to be in. So for our purposes, it doesn’t matter how close together the particles are, as long as they are all in the same container. If we now count the particles in option (A), we see that there are eight of them. Therefore, this container holds the particles at a concentration of eight particles per container. This is a greater concentration than is shown in options (B), (C), and (D).

Thus, option (A) is the correct answer, since it represents the container that holds particles at the greatest concentration.

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