Answer:
Expand
Explanation:
When you heat up a substance it expands
It's 1. Melting a substance. The rest are chemical changes
When reversing a given reaction, we simply change the sign of the standard enthalpy change value. Therefore, the reaction will become:
H₂O → H₂ + 0.5O₂, ΔH = 286kJ
This is because if a certain amount of energy is released when a reaction occurs, the same amount of energy must be supplied for the reaction to occur in the reverse direction.
1.)b
2.)true
3.)false
are the answer don't take me on my word
C. a change of state. It can be a physical or a chemical state of change.
