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1. When an object is heated, the molecules that make up the object .
2. The unit of heat is .
3. One litre of water at \(30°C\) is mixed with one litre of water at \(50°C\). The temperature of the mixture will be .
4. An iron ball at \(50°C\) is dropped in a mug containing water at \(50°C\). The heat will .
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