Module 1, Maths Skills Flashcards
Length unit and symbol
M, l
Mass unit and symbol
Kg, m
Time unit and symbol
S, t
Amount unit and symbol
Mol, n
Temp unit and symbol
K(kelvin), T
Pressure unit and symbol
Pa(pascals), p
Frequency unit and symbol
Hz/s-1, V
Energy unit and symbol
J, E
What is 0K(kelvin) equivalent to in degrees Celsius
-273 *C
Kilo in standard form and symbol
10^3, K
Deci in standard form and symbol
10^-1, d
Centi in standard form and symbol
10^-2, C
Milli in standard form and symbol
10^-3, m
Micro in standard form and symbol
10^-6, u(backwards u)
What is 3um(micro meter) in standard form
3x10^-6
What is 1 tonne equivalent to in kg
1000
How to convert units e.g 12cm to dm
X10^a-b, a=original prefix b=new prefix, a=10^-2 b=10^-1, (-2)-(-1)=x10^-1, 12x10^-1dm = 1.2dm
Converting units in volume, e.g 4dm^3 into cm^3
Do not use ml, l typically, instead cm^3, dm^3. Follow power law (x^n)^m=x^nxm. 1dm^3= 1000cm^3. E.g 4dm^3= 4x(10^-1)^3=4x10^-3, cm^3= (10^-2)^3=10^-6. X10^-3- - 6= x10^3. 4x10^3 cm^3= 4000cm^3
During multiplication and division how should answer be left if not specified
Least number of significant figures in data used
During addition subtraction how should answer be left if not specified
Smallest decimal place in data
What is m in standard form
10^0
What is mega in standard form
10^6
What is nm in standard form
10^-9
What is uncertainty
Half the smaller increment the equipment can measure, in either direction
Percentage error equation
Number of readings x uncertainty/measure value x100
The lower the percentage error the….
More accurate
How many readings for temp
1
How many readings for temp change
2
How many readings for pipette
1
How many readings for a burette (titration)
2
What is 1 litre in dm^3
1
What is 1ml in cm^3
1
How to reduce percentage error on a balance
Increase d.p
How to reduce percentage uncertainty
Have a mass balance to higher d.p, larger/increase mass
