Which of the following is a quantitative property of minerals?
a. cleavage
b. hardness
c. luster
d. streak

B. Hardness

Explanation:

Qualitative properties are properties that are observed and can generally not be measured using a numerical value. Example : Cleavage,  Luster , streak

Quantitative properties are properties that are observed and can generally  be measured using a numerical value. Example: hardness

Hardness of minerals is the resistance of a material to deformation. It is measured using Moh's scale which ranges from 1 to 10 and thus have a numerical value.

Thus Hardness is a quantitative property of minerals.

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e