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Fill in the number of atoms please.

Experiment

Chemicals

Formula

Elements

No of Atoms

Observations













1(A)

Magnesium metal, hydrochloric acid.

Mg +2HCl --> MgCl2 + H2

Mg, HCl





It started bubbling and warming up.

2(B)

Steel wool and copper sulfate.

Fe + CuSO4 --> FeSO4 +Cu

Fe, CuSO



It slowly started to turn copper-coral colour.

3(C)

Sodium sulfate and Barium chloride.

BaCl2 + Na2So4 --> BaSo4 + 2NaCl

BaCl, NaSo



It started getting fizzy and turning white.

1 answer

Here is the completed table with the number of atoms filled in for each chemical reaction:

| Experiment | Chemicals | Formula | Elements | No of Atoms | Observations | |------------|--------------------------------------|---------------------------------------|----------------|----------------|---------------------------------------------| | 1(A) | Magnesium metal, hydrochloric acid | Mg + 2HCl → MgCl2 + H2 | Mg, H, Cl | Mg: 1, H: 2, Cl: 2 | It started bubbling and warming up. | | 2(B) | Steel wool and copper sulfate | Fe + CuSO4 → FeSO4 + Cu | Fe, Cu, S, O | Fe: 1, Cu: 1, S: 1, O: 4 | It slowly started to turn copper-coral colour. | | 3(C) | Sodium sulfate and Barium chloride | BaCl2 + Na2SO4 → BaSO4 + 2NaCl | Ba, Cl, Na, S | Ba: 1, Cl: 2, Na: 2, S: 1, O: 4 | It started getting fizzy and turning white. |

Explanation of the Number of Atoms:

  1. Experiment 1 (A):

    • The balanced formula indicates:
      • 1 Mg, 2 H from 2 HCl, and 2 Cl from MgCl2.
    • Total: 1 (Mg) + 2 (H) + 2 (Cl) = 5 atoms.

  2. Experiment 2 (B):

    • The balanced formula indicates:
      • 1 Fe, 1 Cu from CuSO4, 1 S from SO4, and 4 O from SO4.
    • Total: 1 (Fe) + 1 (Cu) + 1 (S) + 4 (O) = 7 atoms.

  3. Experiment 3 (C):

    • The balanced formula indicates:
      • 1 Ba from BaCl2, 2 Cl from BaCl2, 2 Na from Na2SO4, 1 S from SO4, and 4 O from SO4.
    • Total: 1 (Ba) + 2 (Cl) + 2 (Na) + 1 (S) + 4 (O) = 10 atoms.

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