Worksheetsthermochemistry
Total questions: 14
Worksheet time: 13mins
Thermochemistry is
the study of heat changes when physical reactions occur.
the study of heat changes when chemical reactions occur.
the study of energy changes when chemical reactions occur.
Dissolving ammonium salt in water will cause a ___________ in temperature
increase
higher
drop
constant
Respiration, bomb explosion and neutralisation of acid with alkali are the examples of _______________ reactions
exothermic
endothermic
precipitation
When sodium hydroxide is added to hydrochloric acid, the temperature reading on the thermometer is ______________ and the reaction name is __________________
decreasing, decomposition
increasing, neutralisation
constant, displacement
decreasing, neutralisation
increasing, titration
5.0 g of copper was heated from 20°C to 80°C. How much energy was used to heat Cu? (Specific heat capacity of Cu is 0.092 J/g °C)
27.6 J
36.8J
9.2 J
0.91 J
The specific heat of a substance (C), whose units are J/g°C, is defined as
The number of Joules required to raise the temperature of 1 gram of the substance 1 °C.
The change in temperature when you add 1 Joule of energy.
The number of grams created when the substance cools down 1°C.
How hot or cold that specific amount of substance is.
When Julio dissolved Sodium Hydroxide in water, he noticed that the temperature of the water increased drastically. He could conclude that this dissolving process, shown below, was… NaOH(s) --> Na+ (aq) + OH-(aq)
Exothermic
Endothermic
Neither endothermic or exothermic
Both endothermic and exothermic
According to the diagram, what is ΔH for the reaction?
80 kJ
-80 kJ
240 kJ
-160 kJ
Which potential energy diagram represents the reactions Energy + A + B → C + D?
A
B
C
D
