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Pregunta
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Respuesta correcta
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what is energy? :
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at work all around us, movement, light, change,, |
one answer is wrong. Types of energy :
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lighting a fire |
substance combines with oxygen and forms a new substance :
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oxidation |
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Pregunta
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Respuesta correcta
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we change the physical form of but the material is still the same :
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physical change |
happens when a gas is cooled until it becomes liquid :
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condensation |
what types of changes does heat cause :
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expansion and contraction |
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