Shown above is a balance which currently reads O.0000 g. Based on this instrument, identify from the following list three statements that are true if you were to use this balance to measure the mass of a sample. Choose one or more: A The mass measured on this balance is known exactly B. The uncertainty is in the ones place C. The uncertainty is in the tenths place D. The uncertainty is in the hundredths place E. The uncertainty is in the thousandths place F. The uncertainty is in the ten thousandths place. G. A mass measured on this balance will always have five significant digits H.A mass measured on this balance will always have six significant digits L A mass that falls between 0.01 and 0.09 grams measured on this balance will have two signifcant figures J. A mass that falls between 0.1 and 0.9 grams measured on this balance will have four significant figures K. A mass that falls between 1 and 9 grams measured on this balance will have six significant figures L. A mass that falls between 20 and 70 grams measured on this balance will have six significant figures.

A mass balance is an application of conservation of mass to the analysis of physical systems. It is also called material balance. By accounting for material entering and leaving a system, mass flows can be identified which might have been unknown or difficult to measure without this technique. The exact conservation law used in the analysis of the system depends on the context of the problem, but all revolve around mass conservation. that explains the matter cannot disappear or be created spontaneously .

Assume a mass of 0.1001g. It falls between 0.1g and 0.9 g. it has 4 significant figures.

Let us consider a mass of 1.01124g. This show it is closure to 1.001123. it means the last 2 digit is uncertain.

Again consider a mass of 20.0002g. it falls between 20g and 70 g. it contains six significant figures.

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