Uncertainties and reacting masses Flashcards

1
Q

What is a procedural uncertainty?

A

An uncertainty to do with the experimental method

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2
Q

What is a measurement uncertainty?

A

An uncertainty to do with measurements

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3
Q

What is the equation for percentage uncertainty?

A

% uncertainty = (total uncertainty / actual measurement) x 100

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4
Q

What is the relationship between size of measurement and uncertainty?

A

The greater the measurement, the lower the uncertainty

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5
Q

When does an uncertainty occur?

A

Each time a measurement is made

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6
Q

What is total uncertainty?

A

The number of measurement made x uncertainty per reading

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7
Q

What are examples of equipment where you need to double to uncertainty per measurement?

A

Burette, balance etc

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8
Q

What are examples of procedural errors with the anhydrous salts experiment?

A

Overheating causing decomposition (producing sulfate dioxide gas), solid spitting out of crucible during heating, soot from flame getting on crucible and some water being reabsorbed when cooling.

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9
Q

What does EMMA stand for?

A

E - equation - write balanced equation
M - moles - calculate moles of known product.
M - moles - calculate moles of unknown product
A - answer - convert number of moles to your answer

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