Labs Essay

456 WordsOct 29, 20142 Pages
Balance Lab Note: Since an offset is randomly assigned to centigram balances and mass is randomly assigned to slugs, results will vary. However, the patterns should remain the same. For example, the accuracy of weighing by difference should be confirmed by using a centigram balance and an electronic balance. As for the masses of the unknowns, they are not random and are assigned as listed below. The Centigram Balance: Direct Weighing 1. Mass of slug on a centigram balance using the direct-weighing technique: _2.30g_____ 2. Mass of the same slug directly on another centigram balance: _2.60g_____ Weighing by Difference 1. Weigh the same slug by difference: Mass of the beaker: _49.20g_____ Mass of the beaker and slug: _52.20g_____ Calculated mass of the slug by difference: _3.00g_____ 2. Use the other centigram balance to determine the slug mass by difference: Mass of the beaker: _49.60g_____ Mass of the beaker and slug: _52.60g_____ Calculated mass of the slug by difference: _3.00g_____ 3. Weigh an unknown mass on a centigram balance using the direct-weighing technique: Unknown Weight ID#: _1__ Mass of the unknown: _24.42g_____ 4. Weigh the same mass by difference: Mass of the beaker: _49.20g_____ Mass of the beaker and the unknown: _74.42g_____ Calculated mass of the unknown by difference: _25.22g_____ The Electronic Balance: Mass of the Slug by Direct Weighing and by Difference 1. Direct weighing: Mass of slug: _2.999g_____ 2. By Difference: Mass of the beaker and slug: _52.999g_____ 7 Mass of the beaker: _50.000g_____ Calculated mass of the slug by difference: _2.999g_____ Mass of the Unknown by Direct Weighing and by Difference 1. Direct weighing: Mass of the unknown: _24.823g_____ 2. By Difference: Mass of the beaker and the unknown: _74.823g_____ Mass of the beaker: _50.000g_____ Calculated mass of the unknown by difference:

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