Investigating changes.

We were investigating whether some changes are reversible or irreversible. We were heating different foods.  We used bread, egg, chocolate and butter.

We had a tray with sand in and a candle.

We had to hold a spoon with food in over the candle to see what happened to it.

Butter.

Egg.

Bread.

Chocolate button.

Some melted, some went hard and some went black and crunchy.

We then left them to see if they turned back to how they used to be. The butter and chocolate went hard again, but the egg didn't go runny and the bread didn't go soft.