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Anna11 [10]
2 years ago
6

What is metal ? Where does it coke from ?

Chemistry
2 answers:
DerKrebs [107]2 years ago
8 0

a metal is an element that readily forms positive ions (cations) and has metallic bonds

coke is a strong stimulant made from coca leaves

aleksandrvk [35]2 years ago
5 0

Answer:

  • Most pure metals, like aluminium, silver and copper, come from the Earth's crust.
  • They are found in ores – solid materials called minerals, usually occurring in rock, from which the pure metal has to be extracted.
  • The properties of pure metals can be improved by mixing them with other metals to make alloys.

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Based on the methods used to separate the substance into its parts, is Substance U a compound?
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Name the fundamental unit involved in the derived unit joule?​
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7 0
2 years ago
2Pb(s) + O2(aq) + 4H+(aq) → 2H2O(l) + 2Pb2+(aq)
defon

Answer:

The answer to your question is 0.269 g of Pb

Explanation:

Data

Lead solution = 0.000013 M

Volume = 100 L

mass = 0.269 g

atomic mass Pb = 207.2 g

Chemical reaction

                        2Pb(s) + O₂(aq) + 4H⁺(aq) → 2H₂O(l) + 2Pb₂⁺(aq)

Process

1.- Calculate the mass of Pb in solution

Formula

Molarity = \frac{number of moles}{volume}

Solve for number of moles

Number of moles = Volume x Molarity

Substitution

Number of moles = 100 x 0.000013

Number of moles = 0.0013

2.- Calculate the mass of Pb formed.

                       207.2 g of Pb ----------------- 1 mol

                             x g             ----------------- 0.0013 moles

                        x = (0.0013 x 207.2) / 1

                        x = 0.269 g of Pb                                                                

8 0
3 years ago
Read 2 more answers
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