The document is a crossword puzzle about chemistry terms. Across clues are "physical change" and "oxygen", and down clues are "chemical change", "hydrogen", and "neon". The puzzle provides definitions for common chemistry terms involving physical and chemical changes, gases produced in photosynthesis, and noble gases.

1. PUZZLE TIME
Across
1. Changesoccur in only physicalproperties
2. The gas emitted by the gas during photosynthesis
Downwards
1. Permanent change results the formation of new substances
2. Metals react with acids to form .......... gas
3. Noble gas with two main shells.
Answers
Across
1. Physical change
2. Oxygen
Downwards
1. Chemical change
2. Hydrogen
3. Neon
3
5
1 4
2