Physical or Chemical Change - Heating ZnO

Hypothesis: I think that the change will be a chemical change because heat was given out or absorbed during the experiment. 

Equipment: 

• Sample of ZnO (Zinc Oxide)
• Heat source - Hot Plate
• Scales
• Heatproof container - evaporating dish
• Tongs
• Heatproof mat

Method:

1. Get a sample of ZnO + container - record weight.
2. Weight the ZnO and container - record weight.
3. Heat container + ZnO on the hot plate.
4. Observe any changes - use a phone for before and after photos (video).
5. Take off the heat + put on a heatproof mat.
6. Let cool - observe - photos. 
7. Re-weight.

Results: What happened? - write your description.

The change was a physical change and not a chemical change. When the zinc was heated, there wasn't that much change. Until a few minutes passed the white powder changed to a more pinkish colour, which then turned yellow. However, before we started our experiment, we weighed the dish with the zinc before heating it up on a hot plate. It weighed a total of 57g, this wight remained the same after our experiment was over. 

Conclusion: 

In conclusion, my hypothesis was wrong even though it was given the heat and there was a colour change. It would then change back to its original colour which made it a physical change. Because it could be reversed easily.