Chemical reactions and heat flow

1. A cup of water at 90 °C is placed in a room at 22 °C. Describe the direction of heat flow in this system?

2. Is the chemical reaction involved in fireworks an exothermic reaction or an endothermic reaction? Explain

thank you!

1. Heat flows from a hot object to a cold object, so in this case heat flows from the cup of water to the air in the room.

2. Exothermic. The chemical reaction involved in fireworks is combustion, which is an exothermic reaction at room temperature.