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morpeh [17]
4 years ago
10

PLEASE ANSWERRRRRRRRR

Chemistry
1 answer:
Inessa [10]4 years ago
7 0
C. An electromagnet is temporary and is magnetic when a current flows through a wire wrapped around the core.



It is because electromagnet are the solenoid that behave like a magnet during the flow of an electric current through it. They are temporary.
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4. Balance the following chemical equation. Say what the coefficients "a"
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Answer:

a = 4

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<u>SOLUTION :-</u>

Balance it by using 'hit & trial' method , and you'll get the answer :-

2Fe₂O + 3C → <u>4</u>Fe + <u>3</u>CO₂

⇒ a = 4 ; b = 3

<u></u>

<u>VERIFICATION :-</u>

<em>In reactant side of equation :-</em>

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  • Number of atoms in O = 2×3 = 6
  • Number of atoms in C = 3×1 = 3

<em>In product side of equation :-</em>

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  • Number of atoms in C = 3×1 = 3
  • Number of atoms in O = 3×2 = 6

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