Answer:
D) 3Ni (s) + 2Fe(NO3)3 (aq) → 3Ni(NO3)2 (aq) + 2Fe (s)
Explanation:
According to the metal activity series, only a metal higher in the reactivity series will replace another. A metal can only displace metal ions listed below it in the activity series, but not above.
Iron is higher in the activity series than nickel so it will displace nickel.
The balanced chemical equation will be as follows:
3Ni (s) + 2Fe(NO₃)₃ (aq) → 3Ni(NO₃)₂ (aq) + 2Fe (s)
Hope that helps.
Answer:
C) 1.15 × 10⁻⁷ mm
Explanation:
Step 1: Given data
Average distance between nitrogen and oxygen atoms: 115 pm
Step 2: Convert the distance to meters (SI base unit)
We will use the conversion factor 1 m = 10¹² pm.
115 pm × (1 m/10¹² pm) = 1.15 × 10⁻¹⁰ m
Step 3: Convert the distance to millimeters
We will use the conversion factor 1 m = 10³ mm.
1.15 × 10⁻¹⁰ m × (10³ mm/1 m) = 1.15 × 10⁻⁷ mm
The answer is c electrostatic repulsion between nuclei
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