The enthalpy difference between the reactants and the products is equal to the amount of energy absorbed from the surroundings. A reaction in which energy is absorbed from the surroundings is called an endothermic reaction. ... Exothermic reactions heat up their surroundings while endothermic reactions cool them down.
Answer:
The Halogens
Explanation:
Group 17 element, Group VIIa element, halogen element
- Standard reduction potential of Ag/Ag⁺ is 0.80 v and that of Cu⁺²(aq)/Cu⁰ is +0.34 V.
- The couple with a greater value of standard reduction potential will oxidize the reduced form of the other couple.
Ag⁺ will be reduced to Ag(s) and Cu⁰ will be oxidized to Cu²⁺
Anode reaction: Cu⁰(s) → Cu²⁺ + 2 e⁻ E⁰ = +0.34 V
Cathode reaction: Ag⁺(aq) + e → Ag(s) E⁰ = +0.80 V
Cell reaction: Cu⁰(s) + 2 Ag⁺(aq) → Cu⁺²(aq) + 2 Ag⁰(s)
E⁰ cell = E⁰ cathode + E⁰ anode
= 0.80 + (-0.34) = + 0.46 V
Answer:
copper
Explanation:
The density of copper is 8.96 g/cm³ and the density of zinc is 7.13 g/cm³.
density= mass/volume
⇒mass = density×volume
For copper,
mass = 8.96 g/cm³ × 1 cm³
mass = 8.96 grams
For zinc,
mass = 7.13 g/cm³ × 1 cm³
mass = 7.13 grams
It is clear that, the mass of copper is more.
CaCl2(s) -> Ca^2+(aq)+Cl(aq)