money2tymes
31.08.2019 •
Chemistry
Which of the following is not an element?
carbon
hydrogen
oxygen
salt
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Ответ:
The formation of bubbles and a colour change are signs of a chemical change.
One of the substances must have evolved the gas and changed into something else.
One of the substances must have changed into something else with a different colour.
Both above are chemical changes.
Evaporation and dissolving are physical changes, because the substances do not change their chemical structure in the process.