When sulfur is heated it undergoes a ......1...... change as it melts.
Further heating causes the sulfur to undergo a ......2...... change and form sulfur dioxide.
Which words complete gaps 1 and 2?
1 )
1: chemical / 2: chemical
2 )
1: chemical / 2: physical
1: physical / 2: chemical
4 )
1: physical / 2: physical
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