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not very sure what your question if you can upload again the question that will be great
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Longer hydrocarbon molecules have a stronger intermolecular force. More energy is needed to move them apart so they have higher boiling points . This makes them less volatile and therefore less flammable .
C. His hands and the customers cup have germs and would contaminate the ice. A glass is to a good idea either because if it breaks you can’t use any of the ice.