General Chemistry 2
Quiz by Analyn Dabu
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- Q1
Changes in enthalpy in an exothermic reaction is
constant
negative
neutral
positive
30s - Q2
A reaction is allowed to take place in an insulatedcontainer containing 100mL of water. If the reaction is exothermic, whathappens to the temperature of water?
The temperature of the water goes up.
Noneof the above.
The temperature of the water goes down.
The temperature of the water does not change.
30s - Q3
The thermochemical equation showing the formation of ammonia(NH3) from its elements is:
N2(g) + 3H2(g) → 2NH3(g) ΔH = -92 kJ/mol
This equation shows that 92 kJ of heat is:
Lost to the surroundings when one mole of hydrogen is used up in the reaction.
Lost to the surroundings when 2 moles of ammonia is formed.
Absorbed from the surroundings when one mole of nitrogen reacts.
Absorbed from the surroundings when one mole of ammonia is formed.
30s - Q4
Given the hypothetical thermochemical equation:
A + B → C + D ΔH = -430 kJ/mol
Which among the following statements is correct about thisreaction?
The equation may be written as A + B -- C + D 430 kJ/mol
The heat content of C and D is greater than the heat content of A and B.
The reaction is exothermic.
The heat content of A and B is greater than the heat content of C and D.
30s - Q5
Thechange in the energy between a chemical reaction and the surroundings atconstant temperature is called
dynamic enthalpy
enthalpychange
enthalpy profile
enthalpy
30s - Q6
Theheat of reaction refers to
The amount of heat needed to melt 1 mole of a solid.
The heat released by 1 mole of a substance as it changes froma liquid to a solid.
The heat released after burning 1 mole of a substance.
The heat released or absorbed during a chemical reaction.
30s - Q7
The Law of _______________ states that energy cannot becreated nor destroyed only transferred
PotentialEnergy
SpecificHeat
Conservation of Energy
ExothermicReaction
30s - Q8
What is the internal energy of the system that absorbs 50 J of heat and 15 J workdone by the system?
+40J
+35J
-40J
-35 J
30s - Q9
Calculate the internal energy of the system that absorbs 50 kJ of heat and 65 kJ work done by the system.
-20kJ
+20kJ
+15kJ
-15 J
30s - Q10
When the heat is released by the system, what will be the value of ΔH?
=0
<0
undefined
>0
30s - Q11
In enthalpy change, which process has met this condition:Hproducts < Hreactants?
endothermic
4
heatcontent
exothermic
30s - Q12
Accordingto the first law of thermodynamics, energy can be created and destroyed.
truefalseTrue or False30s - Q13
The energy of the surroundings is called as internal energy.
falsetrueTrue or False30s - Q14
Internal energy of the system is composed of two statef unctions called heat and work.
falsetrueTrue or False30s - Q15
When both q and w are both positive, the internal energy ofthe system increases.
truefalseTrue or False30s