Question

Fill in the blanks .

1. Physical changes are _____ and can be _____ by changing the conditions .
2. Chemical changes can't be reversed by simple _____ methods .
3. A new product formed during a chemical change is completely different from original substance in respect of ______ and properties .4. Chemical changes involve either ______ or ______ of energy .


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Answer 1

Answer:

1. Temporary , simple
2. Manual
3. nature
4. Formation , Breaking

Answer 2

Answer:

They were given the name halogen, from the Greek roots hal- (“salt”) and -gen (“to produce”), because they all produce sodium salts of similar properties, of which sodium chloride—table salt, or halite—is best known.

Explanation:

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