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WorksheetsIG Chapter 7 Chemical energetics
Total questions: 20
Worksheet time: 13mins
Vocabulary: 请拼写“放热的”
(a)
Vocabulary: 请拼写“吸热的”
(a)
Vocabulary: 请拼写“吸收”
(a)
Vocabulary: 请拼写“释放”
(a)
Vocabulary: 请拼写“活化能”
(a)
State whether 'melting of ice' is physical or chemical change?
physical
chemical
State whether 'burning of magnesium' is physical or chemical change?
physical
chemical
State whether 'evaporation of ethanol' is physical or chemical change?
physical
chemical
State whether 'dissolving of sugar in water' is physical or chemical change?
physical
chemical
State whether 'burning of magnesium' is exothermic or endothermic?
exothermic
endothermic
State whether 'condensation of steam to water' is exothermic or endothermic?
exothermic
endothermic
State whether 'addition of concentrated sulfuric acid to water' is exothermic or endothermic?
exothermic
endothermic
State whether 'evaporation of a volatile liquid' is exothermic or endothermic?
exothermic
endothermic
If the reaction is endothermic, _____________.
the temperature decreases
the temperature increases
energy is taken in
energy is given out
If the reaction is exothermic, _____________.
the temperature decreases
the temperature increases
energy is taken in
energy is given out
If ΔH < 0, __________________.
the reaction is exothermic
energy is given out
temperature increases
temperature decreases
What is A?
activation energy
enthalpy change
reactants
products
What is B?
activation energy
enthalpy change
reactants
products
What is D?
activation energy
enthalpy change
reactants
products
This reaction is __________.
endothermic
exothermic
