A 1g sample of a substance starts as ice at -30°C and is heated until it becomes steam at 120°C. Using the provided heating curve graph, determine the total energy added to the substance.

The initial state is 1g of ice at -30°C. On the graph, this corresponds to the starting point of the curve, where "Energy added (J)" is 0 J.

The final state is steam at 120°C. This corresponds to the end point of the curve, labeled E, where the temperature reaches 120°C.

At point E, where the substance is steam at 120°C, the energy added is 3110 J.

The total energy added is the difference between the final energy value and the initial energy value.
Total energy added = Energy at 120°C steam - Energy at -30°C ice
Total energy added = $3110 \, \text{J} - 0 \, \text{J}$
Total energy added = $3110 \, \text{J}$