General Important Practical Stuff Flashcards

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1
Q

How do we justify the number of significant figures used in a practical?

A

Should use the resolution of the measuring equipment

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2
Q

How do we estimate the difference in … using a graph?

A

Count squares

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3
Q

How do we justify if the results of an experiment are consistent with an equation?

A

Analyse the graph
e.g:
-straight line
-intercept is consistent
-passes through all error bars
-values used linked to values in equation
(e.g - using l for V in PV=nRT and V is proportional to T so straight line)

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4
Q

How would we get A=Aoe-kt in graphical form?

A

Take logs

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5
Q

How do we determine a value form a graph?

A

Gradient

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6
Q

how do we “justify” a claim?

A

Do calculations

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7
Q

% difference between 2 values

A

Calculates-actual/actual x100

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8
Q

What do we need to do when going from an equation to a graph?

A

Input the equation into the equation of a straight line
y = mx + c

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9
Q

How do we know which values to put where in the equation of a straight line?

A

Think…
What are the constants?
What are the variables (these will be x and y)

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10
Q

How do we go from having a graph to an equation?

A
  • locate 2 well separated x and y points
  • calculate the gradient
    -can calculate c using y=mx + c
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11
Q

How can we work out the accuracy of a value?

A

Work out the uncertainty
Does the value fit into the uncertainty value?

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