Purely for crystalline structure, "twinning" or repetition of crystal forms can bring about a striated texture on the mineral. Crystal defects and chemical impurities can alter the physical and electrical properties of a mineral. Some minerals can exist in different crystal forms and exhibit "polymorphism." The range in crystal structure can change the mineral's hardness, strength, solubility, electrical properties, melting points, etc.
Answer:
720 000
Explanation:
7.2
×
10
5
is already expressed in
standard form
I believe you mean express as
original number
To do this consider
10
5
or more generally
10
n
where n is an integer.
• If n > 0
move decimal point n places to the right
• If n < 0
move decimal point n places to the left
here n = 5 > 0, hence move decimal point 5 places to the right.
⇒
7
∙
2
→
720000
∙
⇒
7.2
×
10
5
=
720
000
Explanation:
The technique which is used to purify the chemicals is said to be recrystallization.
In this process, solute is dissolved in a particular solvent and according to its principle, the quantity of solute which is dissolved by solvent increases with increase in temperature. The solutes are more soluble at high temperatures in comparison to room temperature (insoluble) or low temperature. Therefore, heating is needed to dissolve the solute in the solvent.
Now, in the case of hexane or diethyl ether, flameless heating is required because of their low boiling points implies if they heat directly on fire, then they have tendency to catch fire. Thus, hexane and diethyl ether are highly flammable.
Answer:
chromium(III) oxide
CR2O3
I hope this will help you
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Answer:
Mass = 1188.13 g
Explanation:
Given data:
Mass of ZnO produced = ?
Moles of oxygen = 7.3 mol
Solution:
Chemical equation:
2Zn + O₂ → 2ZnO
Now we will compare the moles oxygen and and ZnO.
O₂ ; ZnO
1 : 2
7.3 : 2/1×7.3 = 14.6 mol
Mass of ZnO:
Mass = number of moles × molar mass
Mass = 14.6 mol × 81.38 g/mol
Mass = 1188.13 g
