Question

1. a group of students must identify four unknown solids based on their physical properties. they test mass, volume, solubility, and magnetism. their results are shown below:

substance	mass	solubility in water	magnetism
b	75 g	does not dissolve	magnetic
c	25 g	dissolves partially	not magnetic
d	60 g	does not dissolve	not magnetic

which conclusion is correct?
a. substance b must be iron because it is magnetic.
b. substance a must be salt because it dissolves completely.
c. substance c must be wood because it dissolves partially.
d. substance d must be sugar because it does not dissolve.

Explanation:

Step1: Analyze solubility and magnetism data

We are given mass, solubility in water and magnetism data for substances A, B, C and D.

Step2: Evaluate each conclusion

• Substance A is not magnetic and dissolves fully. It can't be iron (magnetic).
• Substance B is magnetic and dissolves partially. Salt is not magnetic.
• Substance C is not magnetic and dissolves partially. Wood doesn't dissolve in water.
• Substance D is not magnetic and doesn't dissolve. Sugar doesn't dissolve fully in all cases and is non - magnetic.

Answer:

D. Substance D must be sugar because it does not dissolve.