Which picture correctly depicts only a compound

Question

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1 point
Captionless Image

Option 1

Option 2

Option 3

Option 4
Which of the following observations is the BEST evidence that a sample of an unknown liquid is composed of only one pure substance?
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The sample partially freezes at one temperature.
The sample leaves behind a residue when filtered.
The sample boils away completely at a single temperature.
The sample appears cloudy with observable particles of different sizes throughout.
A student places several ice cubes in hot water. The ice cubes melt in the water, and the water becomes warm. The picture shows this process. Which of the following BEST describes the glass of warm water?
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1 point
Captionless Image
It is not a mixture because ice and water are two substances in two different states.
It is a mixture because ice and water are two different substances in two different states.
It is a mixture because the ice melted and combined with the liquid water in the same state.
It is not a mixture because the ice melted and combined with the liquid water in the same state.
A student makes two mixtures, both made of the same substances. What must be true of the two mixtures?
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1 point
Both mixtures have the same density.
Both mixtures have the same temperature.
Both mixtures are physically combined in the same proportions.
Both mixtures can be physically separated into its components.
What is one way to separate the different substances in a mixture?
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1 point
Captionless Image

Option 1

Option 2

Option 3

Option 4
The picture below shows a chemistry experiment. Which statement best describes steps of this experiment?
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1 point
Captionless Image
Step one contains a compound, which is chemically combined in step two, forming a mixture in step three.
Step one contains a compound, which is physically combined in step two, forming a mixture in step three.
Step one contains one element, which is physically changed in step two, forming a new compound in step three.
Step one contains a mixture of elements, which are chemically combined in step two, forming a new compound in step three.

Answer 1

Here are the answers to your questions based on typical chemistry understanding:

1. Which picture correctly depicts only a compound?

   • This question cannot be answered without the images depicted in the options.

2. Which of the following observations is the BEST evidence that a sample of an unknown liquid is composed of only one pure substance?

   • The sample boils away completely at a single temperature. (This indicates a pure substance because pure substances have specific boiling points.)

3. Which of the following BEST describes the glass of warm water?

   • It is a mixture because ice and water are two different substances in two different states. (The ice and water coexist but are distinct phases.)

4. A student makes two mixtures, both made of the same substances. What must be true of the two mixtures?

   • Both mixtures can be physically separated into its components. (This is true for all mixtures.)

5. What is one way to separate the different substances in a mixture?

   • This question requires images to choose from, so it cannot be answered without that context.

6. The picture below shows a chemistry experiment. Which statement best describes steps of this experiment?

   • This question cannot be answered without seeing the experiment depicted in the images.

Please provide the images or more context if you need specific answers to those questions involving images.