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.

1. a group of students is asked to identify four unknown substances. they test them in different ways and record results in the table:

substance	test result
b	melts at 0°c
c	attracts to a magnet
d	floats in water

which correctly matches the property being tested for substance d?
a. mass
b. density
c. solubility
d. conductivity

Explanation:

Step1: Analyze question 5

Check each option based on properties.

Step2: Evaluate option A in question 5

Just dissolving fully doesn't prove it's salt. Other substances can dissolve fully too.

Step3: Evaluate option B in question 5

Being magnetic doesn't necessarily mean it's iron. Other metals are magnetic.

Step4: Evaluate option C in question 5

Wood doesn't dissolve partially in water in the way described.

Step5: Evaluate option D in question 5

Sugar dissolves in water, not doesn't dissolve. So this is wrong.

Step6: Analyze question 6

Understand what property causes floating.

Step7: Evaluate options in question 6

Floating in water is related to density. If density is less than water's, it floats.

Answer:

1. None of the above
2. B. Density