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nordsb [41]
4 years ago
10

Which of the following rocks is commonly used as an abrasive?

Chemistry
2 answers:
Ratling [72]4 years ago
6 0
PUMICE<span>: An </span>igneous<span>-volcanic rock, it is a porous, brittle variety of rhyolite and is light enough to float. It is formed when magma of </span>granite<span> composition erupts at the earth's surface or intrudes the crust at shallow depths. It is used as an abrasive material in hand soaps, emery boards, etc.</span>
OlgaM077 [116]4 years ago
5 0
The rock that is commonkt used as an abrasive is pumice 
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Zn+2HCl=ZnCl2+H2 How many grams of ZnCl2 will be produced from 26.0 g of Zn and 42.0 g of HCl?
irakobra [83]

53.14 grams of ZnCl_{2}  will be produced from 26.0 g of Zn and 42.0 g of HCl.

Explanation:

Balanced chemical reaction:

Zn + 2 HCl ⇒ ZnCl_{2} +  H_{2}

data given:

mass of Zn = 26 grams

mass of HCl = 42 grams

mass of ZnCl_{2} = ?

here in the reaction Zn is the limiting reagent so mass of

ZnCl_{2} formed will be determined by it.

atomic mass of zinc =65.38 grams/mole

number of moles = \frac{mass}{atomic mass of 1 mole}

putting the values in the above equation:

number of moles of zinc = \frac{26}{65.38}

number of moles of zinc = 0.39 moles

From the balanced reaction it is seen that

1 mole of Zn produced 1 mole of ZnCl_{2}

0.39 moles will produce x moles of ZnCl_{2}

0.39 moles of ZnCl_{2} (atomic mass of  Zn = 65.38 grams/mole)

mass = atomic mass x number of moles

         = 0.39 x 136.28

           = 53.14 grams

53.14 grams of ZnCl_{2} is formed

5 0
3 years ago
Reaction type <br> Li + N2<br> Li3N
Blababa [14]

Answer:

Combination or synthesis

Explanation:

The given reaction is:

            6Li +  N₂ → 2 Li₃N

This reaction is a synthesis or combination reaction. 6 moles of Li combines with nitrogen gas to produce 2 moles of  Li₃N.

  • In a synthesis reaction, two substances combines together to give singular product.
  • The formation of compounds from the union of the constituent elements falls into this category of reaction.
6 0
3 years ago
A sample of a compound consisting only of copper and sulfur contains 88.39g of the metal and 44.61g of non-metal. How many grams
Lorico [155]
<span>(88.39 / (88.39 + 44.61) ) x (5264000) = answer for copper grams 

(44.61 / (88.39 + 44.61)) x (5264000) = answer for sulfur grams 

Sulfur is a non-metal used to make paper, number 16 on periodic table.</span><span>

</span>
6 0
4 years ago
You are given three beakers of unknown liquids. One beaker contains sugar water. Without tasting the liquids, how could you iden
Marrrta [24]

You would observe, trying to identify if there's a minimum difference in each beaker. Like, colour, or using an <em>bagueta </em>(idk how to say it in english), churning it or something like that.

8 0
3 years ago
32
myrzilka [38]

Answer:

0.305 mol

Explanation:

Ca(NO) is not a molecule. I think you meant to type Ca(NO3)2, which is calcium nitrate.

The moles of a compound is equal to is mass divided by its molar mass.

The molar mass of Ca(NO3)2 is 164.09 g/mol.

50.0 / 164.09 = 0.305

6 0
2 years ago
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