Me!
1. classify the following materials as a mineral, gem, ore, or none. some may have more t...
![subject](/tpl/images/cats/himiya.png)
Chemistry, 01.10.2019 02:00 daiscott2306
Me!
1. classify the following materials as a mineral, gem, ore, or none. some may have more then one answer.
hematite
sphalerite
diamond
2. explain why most quartz is not considered a gemstone while amethyst, which is a kind of quartz, is a gemstone.
3.what three qualities of titanium make it a good material for producing hip or knee replacements?
4.what qualities must a mineral possess in order to be considered a gem?
5.today, most mining for ore involves digging beneath earth's surface. why is this necessary?
![ansver](/tpl/images/cats/User.png)
Answers: 1
Another question on Chemistry
![question](/tpl/images/cats/himiya.png)
Chemistry, 22.06.2019 13:30
How many protons, electrons, and neutrons are in each of the following isotopes? a. zirconium-90 b. palladium-108 c. bromine-81 d. antimony-123
Answers: 1
![question](/tpl/images/cats/himiya.png)
Chemistry, 22.06.2019 14:10
16. in a reaction that has reached equilibrium, a. the forward and reverse reactions are occurring at the same rate. b. the reactants and products are in equal concentrations. c. the forward reaction has gone further than the reverse reaction. d. there are equal numbers of atoms on both sides of the equation. e. a, b, and d are correct.
Answers: 2
![question](/tpl/images/cats/himiya.png)
Chemistry, 23.06.2019 08:50
Reacting masses1 calcium carbonate breaks down on heating to produce calcium oxide and carbondioxide gas.caco3 + cao + co2a student heats 15 g of calcium carbonate strongly in a crucible.relative atomic masses (a): ca = 40, c = 12, o = 16.calculate the mass of calcium oxide produced by this reaction.(5 marks)
Answers: 3
![question](/tpl/images/cats/himiya.png)
Chemistry, 23.06.2019 09:30
The earth's surface is (science) a: studied using seismic waves b: constantly changing over time c: only studied indirectly d: the same today as million of years
Answers: 1
You know the right answer?
Questions
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 01.04.2021 22:00
![question](/tpl/images/cats/himiya.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 01.04.2021 22:00
![question](/tpl/images/cats/mat.png)
Mathematics, 01.04.2021 22:00
![question](/tpl/images/cats/fizika.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 01.04.2021 22:00
![question](/tpl/images/cats/mat.png)
Mathematics, 01.04.2021 22:00
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/istoriya.png)
History, 01.04.2021 22:00
![question](/tpl/images/cats/mat.png)
Mathematics, 01.04.2021 22:00
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 01.04.2021 22:00
![question](/tpl/images/cats/himiya.png)
Chemistry, 01.04.2021 22:00
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/himiya.png)