Question

10 multiple choice 1 point
what use does sulfur have?
lead acid batteries
wallboard (also known as drywall)
salting roads in winter
baby powder
explosives (gun powder, fireworks, etc.), rubber
cement
use this for questions 11 - 12
mohs hardness scale
11 multiple answer 1 point
according to this chart, what mineral(s) can be scratched by a penny? select all that apply.
diamond
corundum
topaz
quartz
orthoclase
apatite
flourite
calcite
gypsum
talc

Explanation:

Question 10

Step1: Recall sulfur uses

Sulfur is used in explosives (gunpowder, fireworks, etc.) and rubber (vulcanization process). Lead - acid batteries use lead and sulfuric acid (not just sulfur). Wallboard (drywall) mainly contains gypsum (calcium sulfate dihydrate). Salting roads in winter uses salts like sodium chloride. Baby powder is usually talcum powder (magnesium silicate hydroxide). Cement is a mixture of calcium - based compounds.

Question 11

Step1: Know Mohs hardness scale and penny hardness

A penny has a hardness of about 3.5 on the Mohs scale.

Step2: Compare mineral hardness

Diamond (10), Corundum (9), Topaz (8), Quartz (7), Orthoclase (6), Apatite (5) have hardness greater than 3.5. Flourite (4) has a hardness greater than 3.5. Calcite (3) has a hardness less than 3.5. Gypsum (2) has a hardness less than 3.5. Talc (1) has a hardness less than 3.5.

Answer:

• Question 10: explosives (gun powder, fireworks, etc.), rubber
• Question 11: Calcite, Gypsum, Talc