Three reactions are described.
1- An acid is added to substance H. Rapid fizzing happens and the temperature decreases.
2- When substance J is ignited, it produces large quantities of heat.
3- Substance K reacts slowly with air and becomes warmer.
Which reactions are endothermic?
1 )
2 and 3 only
2 )
1 only
1 and 2 only
4 )
1, 2 and 3
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