Answer:
Chemical properties are tested on not because of their color or their appearance but how they will react to certain tests. Such as; is it flammable? Could it be toxic? Physical properties are tested on and observed because of the texture, the color, smell and etc.
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Answer:
Option B is correct.
Explanation:
Carbohydrate fermentation test; its main purpose is to know if a bacteria can ferment a specific carbohydrate or not. The test can be used for distinguishing bacterial species.
When fermentation of carbohydrate occurs, gaseous acids are produced. This production of the acid lower the pH of the medium undergoing the test, which can be detected by the color change of the pH indicator.
The Color changes only when sufficient amount of acid is produced. Phenol red can easily detect single acid production but METHYL RED NEED MORE ACID.
Scenario 1 or conclusion questions
Answer:
C. Liquid molecules and atoms are able to slip around each other and fill in gaps between them.
Explanation:
The liquid is a state of matter that has no definite shape. In fact, it can adapt to the shape of its container. This is because of the reason that molecules in the liquid phase have high kinetic energy and weak binding forces. The high energy keeps them moving freely and thus can take the shape of it its container. On the other hand, in solids, the binding forces are stronger and molecules have very little energy to move freely.
Example: If we melt a solid, the molecules initially have less energy. However, when we heat them, they gain energy and start moving. Upon further heating, they will have enough energy to break the bondings and move around. This is why the solid structure will change to the liquid.
