Question

Achel adds all 50 grams of one powder to 100 ml of water and stirs it for a while. Afterwards, she has a clear liquid with no trace of the powder in it. Which of the following could this powder have been?

Options:
Option 1: Salt
Option 2: Flour
Option 3: Sugar
Option 4: All of these

Answer 1

Salt (NaCl) and sugar can dissolve in water to form a clear liquid, while flour does not dissolve and would leave the water cloudy.

Step-by-step explanation:

The question relates to the dissolution of substances in water, which is a common experiment in high school chemistry lessons.

When Rachel adds a powder to water and it dissolves completely, forming a clear liquid, we can consider the solubility of the mentioned substances. Salt (NaCl) and sugar are both known to dissolve in water, creating a solution where you cannot see the individual particles anymore. On the other hand, flour usually does not dissolve in water and would likely leave a trace or make the mixture cloudy rather than clear. Therefore, the powders that Rachel could have added to water to obtain a clear liquid are salt and sugar.