Measuring Mineral Hardness With Mohs Scale

The video tutorial introduces Mohs hardness scale, a system developed by Frederick Mohs in 1812 to measure mineral hardness. It demonstrates how to use common objects like fingernails, knives, and steel files to test the hardness of various minerals and unknown materials. The tutorial explains the scale's relevance and provides practical examples of testing different substances, concluding with a call to explore more science facts on Instagram.

Who developed the Mohs hardness scale?

• Isaac Newton

• Frederick Mohs

• Marie Curie

• Albert Einstein

What does the Mohs hardness scale measure?

• The color of minerals

• The density of minerals

• The hardness of minerals

• The weight of minerals

If a mineral can be scratched by a substance, what does it indicate?

• The mineral is the same hardness as the substance

• The mineral is softer than the substance

• The mineral is denser than the substance

• The mineral is harder than the substance

What is the hardness of a fingernail on the Mohs scale?

• 4.5

• 3.5

• 2.5

• 1.5

Which mineral is the hardest on the Mohs scale?

• Talc

• Quartz

• Diamond

• Corundum

What is the hardness of a knife on the Mohs scale?

• 3.5

• 4.5

• 5.5

• 6.5

What is the hardness of a steel file on the Mohs scale?

• 8.5

• 7.5

• 6.5

• 5.5

What is the approximate hardness of cement sheeting tested in the video?

• 4

• 3

• 2

• 1

If a rock is harder than quartz but softer than beryl, what is its approximate hardness?

• 8.5

• 7.5

• 6.5

• 9.5

What is the purpose of the Mohs hardness scale?

• To measure the weight of minerals

• To identify the color of minerals

• To determine the hardness of minerals

• To calculate the density of minerals