IG Chapter 7 Chemical energetics

Vocabulary: 请拼写“放热的”

Vocabulary: 请拼写“吸热的”

Vocabulary: 请拼写“吸收”

Vocabulary: 请拼写“释放”

Vocabulary: 请拼写“活化能”

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