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Worksheetsthermochemistry
Total questions: 10
Worksheet time: 5mins
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.
