In a closed system, the law of conservation of mass says that some mass is lost over time.

Choose 1 answer

True

False

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Which of these chemical formulae contain 3 different atomsl? Choose 1 answer

Choose 1 answer

H2O

NaOH

CH4

NH3

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Which of the following situations does not follow the conservation of mass?

(choose 1)

Choose 1 answer

A candle burning

Iron rusting

Mixing sodium bicarbonate and vinegar to make carbon dioxide

None of the above

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Which of these is true about why the conservation of mass is helpful.

Choose 1 answer

It can help a chemist get a good job.

It can reduce time wasted making products.

t can help make sure that a manufacturer makes the correct amount of product

It can ensure a manufacturer makes a perfect product.

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Answer incorrect

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