Ethanol is more inflammable.
Answer:
False, the empirical formula denotes the smallest whole-number ratio of atoms in a compound
Explanation:
a molecular formula is the total number of atoms in the compound
Answer :
(a) Reactant Mg is oxidized and reactant Fe is reduced.
(b) Reactant C is oxidized and reactant Cu is reduced.
Explanation :
As we know that a reactant is either reduced or oxidized in a chemical reaction.
- If the oxidation state of an atom is decreases or gains electrons from reactant to product side then we can say that the reactant is reduced that means reduction.
- If the oxidation state of an atom is increases or loses electrons from reactant to product side then we can say that the reactant is oxidized that means oxidation.
Part (a):
The given word equation of chemical reaction is:
Magnesium metal + Aqueous iron (III) sulphate → Iron metal + Aqueous magnesium sulphate
The balanced chemical equation of this word equation will be:
In this reaction, the oxidation state of reactant Mg changes from (0) to (+2) that shows oxidation due to increase in oxidation state. So, we can say that Mg is oxidized.
And, the oxidation state of reactant Fe changes from (+3) to (0) that shows reduction due to decrease in oxidation state. So, we can say that Fe is reduced.
Part (b):
The given word equation of chemical reaction is:
Solid carbon + Solid copper oxide → Carbon dioxide gas + Copper metal
The balanced chemical equation of this word equation will be:
In this reaction, the oxidation state of reactant C (carbon) changes from (0) to (+4) that shows oxidation due to increase in oxidation state. So, we can say that C is oxidized.
And, the oxidation state of reactant Cu changes from (+2) to (0) that shows reduction due to decrease in oxidation state. So, we can say that Cu is reduced.
Answer:
1,620 J.
Explanation:
- The amount of heat added to a substance (Q) can be calculated from the relation:
<em>Q = m.c.ΔT.</em>
where, Q is the amount of heat released from ethanol cooling,
m is the mass of ethanol (m = 60.0 g),
c is the specific heat of ethanol in the liquid phase, since the T is cooled below the boiling point and above the melting point (c = 1.0 J/g °C),
ΔT is the temperature difference (final T - initial T) (ΔT = 43.0 °C – 70.0 °C = - 27.0 °C).
<em>∴ Q = m.c.ΔT</em> = (60.0 g)(1.0 J/g °C)(- 27.0 °C) = - 1620 J.
<em>The system releases 1620 J.</em>