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Ksenya-84 [330]
3 years ago
14

Mount Rushmore national memory in South Dakota was carved out of grantie that formed from cooled magma what type of rock matches

this description ​
Chemistry
1 answer:
gulaghasi [49]3 years ago
7 0

Answer:

igneous rocks

Explanation:

igneous rocks forms from lava, such as obsidian, basalt, plumice, etc

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The density of liquid mercury is 13.69 g/cm^3. How many atoms of mercury are in a 15.0 cm^3 sample? Use "E" for "x10" and use si
balu736 [363]
The formula is  m = D x V
D = <span>13.69 g/cm^3.
</span>V = <span>15.0 cm^3 
the mass of the liquid mercury is m= </span>13.69 g/cm^3 x 15.0 cm^3 = 195g
the molar mass of Hg is 200,
1 mole of Hg = 200g Hg, so #mole of Hg= 195 / 200 = 0.97 mol
but we know that
 1 mole  = 6.022 E23 atoms
0.97 mole=?

6.022 E23 atoms x 0.97 / 1 mole = 5.84 E23 atoms
6 0
3 years ago
In a chemical change
Vsevolod [243]

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B. materials change their properties.

Explanation:

In a chemical change, materials often change their properties because a re-arrangement of atoms takes place.

A chemical change is one in which new kind of matter is formed.

It is always accompanied by energy changes.

  • Chemical changes are not reversible.
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How many atoms are there in:
hoa [83]
B is the right answer "right"
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Why is it important to use low flame when evaporating water from a recovered filtrate?
goldfiish [28.3K]

It is important to use low flame when evaporating water from a recovered filtrate because then the water and filtrate will not spatter and the filtrate can also be recovered after evaporating water.

If flame is not low then water as well as got spatter so it is important to use low flame so that   the water and filtrate will not spatter.


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Why the partial charge on H in HF is more positive than the partial charge on H in HBr
erik [133]
Because fluorine has a higher electronegativity
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