Change in colour as well as liberating gas are the evidences that chemical reaction or change taken place.
The change in colour of the solution provides us information or evidence is that chemical change has taken place. There are many other ways which provides evidence of taking place of chemical change is the release of gas from the solution after adding powder or any substance.
There are some reactions in which new substance is formed which is also an identification of chemical change so we can conclude that change in colour as well as liberating gas are the evidences that chemical reaction or change taken place.
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D.All of above. Hope it helps!!!
Using, the table given above, one can conclude that, IT IS NOT ALWAYS POSSIBLE TO IDENTIFY A SUBSTANCE AS A COMPOUND, MIXTURE, PURE SUBSTANCE OR AN ELEMENT JUST BY LOOKING AT THEM.
Looking at the table, you will observe that, some of the substances listed under mixtures are actually compounds. That is, combination of hydrogen and oxygen will form water, which is a compound. Also, combination of sodium and chlorine will form sodium chloride, which is a compound.
Condensation occurs when a gas comes into contact with a cold surface and transforms into a liquid. This transition occurs because the gas particles lose energy and their intermolecular forces draw them together. An example of this is when the warm breath condenses on a cold window.
When a gas reaches a cold surface, it experiences a phase transition known as condensation. During this process, the gas particles lose energy due to the low temperature, which slows down their motion and allows intermolecular forces to draw them closer together, thus transforming the gas into a liquid.
For instance, when you breathe on a cold window, the water vapor in your breath condenses on the glass surface into tiny liquid droplets. Similarly, when high atmospheric pressure forces a gas like carbon dioxide to transition into a liquid, it's known as condensation.
Deposition is a similar process where a gas transform directly into a solid, bypassing the liquid state. For example, the formation of frost is a result of deposition where water vapor turns directly into ice crystals. However, this phenomenon is different from the situation described in your question.
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B) add a small amount of sugar.
C) boil the water.
D) remove the salt.
Answer:
A. Add sand
Explanation:
A mixture in which particles are not uniformly distributed throughout the solution then it is known as a heterogeneous mixture.For example, sand in water is a heterogeneous mixture.Where as a mixture in which particles are evenly distributed throughout the solution then it is known as a homogeneous solution.For example, salt in water is a homogeneous solution. This, is why we can conclude that to make salt water a heterogeneous mixture, you would have to add sand.
Hopefully this answers your question.
a small swimming pool
a candle stick
a water balloon tied at the top