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Standard IX
Chemistry
Writing and Reading a Chemical Equations
If heat or so...
Question
If heat or some other gas is evolved(exothermic reaction), then it is denoted by an upward arrow in a chemical equation. In the same way, if heat is absorbed (endothermic reaction) by the reactants, then by which symbol is this denoted?
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Q.
Heat of a reaction is defined as the amount of heat absorbed or evolved at a given temperature when the reactants have combined to form the products is represented by balanced chemical equation. If the heat is denoted by
q
then the numerical value of
q
depends on the manner in which
the reaction is performed for two methods of conducting chemical reactions in calorimeters.
The heat of combustion of maltose at a constant volume in the above question if water vapour is not condensed will be:
Q.
Heat of a reaction is defined as the amount of heat absorbed or evolved at a given temperature when the reactants have combined to form the products is represented by balanced chemical equation. If the heat is denoted by
q
then the numerical value of
q
depends on the manner in which
the reaction is performed for two methods of conducting chemical reactions in calorimeters.
The heat capacity of a bomb calorimeter is 300 J/K. When 0.16 gm of methane was burnt in this calorimeter, the temperature rose by
3
∘
C
. The value of
Δ
U
per mole will be:
Q.
Heat of a reaction is defined as the amount of heat absorbed or evolved at a given temperature when the reactants have combined to form the products is represented by balanced chemical equation. If the heat is denoted by
q
then the numerical value of
q
depends on the manner in which
the reaction is performed for two methods of conducting chemical reactions in calorimeters.
The heat capacity of a bomb calorimeter is 300 J/K. When 0.16 gm of methane was burnt in this calorimeter, the temperature rose by
3
∘
C
. The value of
Δ
U
per mole will be:
Q.
Heat of a reaction is defined as the amount of heat absorbed or evolved at a given temperature when the reactants have combined to form the products is represented by balanced chemical equation. If the heat is denoted by
q
then the numerical value of
q
depends on the manner in which
the reaction is performed for two methods of conducting chemical reactions in calorimeters.
When maltose
C
12
H
22
O
11
(
s
)
burns in a calorimetric bomb at 298 K yielding carbon dioxide and water, the heat of combustion is
−
1350
kcal/mol
, the heat of combustion of maltose at constant
pressure will be:
Q.
Assertion :Chemical reactions in which heat is released along with the formation of products are called exothermic reactions. Reason: Chemical reactions that absorb energy or require energy to proceed, are called endothermic reactions.
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