Question

moji listed the solids in order of hardness as graphite < chalk < quartz. his peer group suggested some experimental errors that may have caused this to happen. which experimental error most likely led moji to this conclusion?
a. moji might have thought that crumbliness was a sign of softness.
b. moji could have chosen hardness tests that were not reliable.
c. moji might have used color as an indication of hardness.
d. moji might have thought that crumbliness was a sign of hardness.

Explanation:

Hardness is a measure of a material's resistance to being scratched or indented. If Moji mis - interpreted crumbliness as a sign of softness, it could lead to an incorrect ranking of hardness. Crumbliness is not related to color, and if the hardness tests were unreliable, it would not specifically point to the mis - interpretation of crumbliness as a sign of softness. Thinking crumbliness is a sign of hardness would lead to the opposite incorrect conclusion.

Answer:

A. Moji might have thought that crumbliness was a sign of softness.