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WorksheetsThermochemistry
Total questions: 59
Worksheet time: 39mins
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.
Diagram shows reaction between sodium and water. The reaction is
(a)
A device that is suitable to determine exothermic or endothermic reaction is (a)
Exothermic reaction is where heat is __________ to the surrounding
taken in
absord
released
Endothermic reaction is when the heat is _________________ from the surrounding
taken in
released
taken out
Cake baking is
endothermic
exothermic
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
increasing
constant
neutralisation
titration
Endothermic reaction that occurs in plants is (a)
Exothermic reaction that occurs in animals is (a)
During chemical reactions, the chemical energy in the reactants an be changed into other forms, into heat energy?
true
false
what is the unit of measuring energy?
Joules, J
Kj/m
KWatt
mol
what is the meaning exothermic reaction.
heat is released to the surrounding
heat is absorbed from the surrounding
Surrounding do not involve in the reactions, Surrounding included (4 answers)
thermometer
air
container which holds the reactants and the products
solvent in which the reactions are taking place
reactans and products
thermochemistry is
the study of heat released only
the study of changes in heat energy which take place during chemical reactions
the study of heat absorbed only
the energy level diagram
in an endothermic reaction reaction,
The temperature of the surroundings increases.
The reaction container becomes hot.
Energy changes from chemical energy
to heat energy.
The temperature of the surroundings decreaces
in an exothermic reactions, (3 answers)
The temperature of the surroundings increases.
The reaction container becomes hot.
Energy changes from chemical energy
to heat energy.
The reaction container become cold
EXAMPLES OF EXOTHERMIC REACTIONS ,
Thermal decomposition of carbonate salts
Neutralization reactions
Thermal decomposition of nitrate salts
Dissolving of ammonium or potassium salts in water
when a piece of magnesium ribbon is added to some dilute hydrochloric acid in a test tube, a reaction occurs and the test tube becomes hot. the type of reaction is.....
exothermic reaction
endothermic reaction
Energy level diagram for endothermic reaction
•The energy of the products is higher than the energy of the reactants.
•The energy of the products is lower than the energy of the reactants.
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 physical reactions occur.
Diagram shows reaction between sodium and water, producing heat. The reaction is known as (a) reaction
A device that is suitable to determine exothermic or endothermic reaction is (a)
Exothermic reaction is where heat is __________ to the surrounding
taken in
absord
released
Endothermic reaction is when the heat is _________________ from the surrounding
taken in
released
taken out
Cake baking is
endothermic
exothermic
Dissolving ammonium salt in water will cause a ___________ in surrounding 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
increasing
constant
neutralisation
titration
Based on the experiment, sodium hydroxide and ammonium chloride are the
responding variable
fixed variable
manipulated variable
Endothermic reaction that occurs in plants is (a)
Exothermic reaction that occurs in animals is (a)
Dissolving ammonium salt in water will cause a ___________ in surrounding temperature
increase
higher
drop
constant
Respiration, bomb explosion and neutralisation of acid with alkali are the examples of _______________ reactions
exothermic
endothermic
precipitation
An exothermic reaction
absorbs heat
releases heat
produces sugar
is really endothermic
An endothermic reaction
releases heat
absorbs heat
produces fuel
produces oxygen
_____ reactions usually feel hot!
endothermic
exothermic
____ reactions usually feel cold.
endothermic
exothermic
During an exothermic reaction, heat is _________ and chemical bonds __________.
released, formed
absorbed, broken
released, broken
absorbed, formed
During an endothermic reaction, heat is ________ and chemical bonds _______.
released, formed
absorbed, broken
released, broken
absorbed, formed
Exo means out or ________.
absorbed
released
When a candle is lit hydrocarbons are combusting. An exothermic reaction is occuring. Energy is being _________________ .
absorbed
frozen
destroyed
released
When calcium reacts with water, the temperature changes from 18°C to 39°C. Which statement is correct?
The solution at the end is acidic
The reaction is reversible
The reaction is exothermic
The reaction is endothermic
