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Because the balloon is placed on top of the flask, the substances in the flask are part of a closed system. Use the drop-down menus to complete the statement that describes the contents of the
closed system.
The initial mass of the substances in the flask is
the final mass of the substances in the
flask. This is because the balloon
The initial volume of the substances in the flask is
the final volume of the substances in the flask. This is because the balloon

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