1-A
2-D
Activation energy is the minimum amount of energy needed for a reaction to happen.
Answer:
Theoretical yield: 13.9 g
Percent yield: 94 %
Explanation:
The reaction is:
CaCO₃ → CaO + CO₂
We see that the reaction is correctly balanced.
1 mol of calcium carbonate can decompose to 1 mol of calcium oxide and 1 mol of carbon dioxide.
We convert the mass to moles: 24.8 g . 1mol / 100.08g = 0.248 moles
As ratio is 1:1, 0.248 moles of salt can decompose to 1 mol of oxide.
We convert the moles to mass: 0.248 mol . 56.08g /1mol = 13.9 g
That's the theoretical yield.
To determine the percent yield we think:
(Determined yield / Theoretical yield) . 100 → (13.1 / 13.9) . 100 = 94 %
Answer:
We can see that at the boiling point, both liquid and gas are in equilibrium with one another. This is true for any applied pressure and boiling point temperature combination. As a result, we see liquid-gas equilibrium for every temperature and pressure combination on the graph in Figure 13.6.
OILRIG:
Oxidation is loss (of electrons)
Reduction is gain (of electrons)
so...
The first one is an oxidation half-equation as the Sn loses electrons;
The second one is a reduction half-equation as the Cl₂ gains electrons
Answer:
d = endothermic
Explanation:
Chemical equation:
2CO₂ → 2CO + O₂
When carbon dioxide form carbon monoxide and oxygen the ΔH is +570KJ.
When enthalpy of reaction is positive and ΔH is greater than zero it means heat is given to the reaction.
It is called endothermic reaction.
In this case enthalpy of product is higher than enthalpy of reactant
When enthalpy of reaction is negative and ΔH is less than zero it means heat is released during the reaction.
It is called exothermic reaction.
In this case enthalpy of product is lower than enthalpy of reactant.