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Lecture 1

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Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

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#1
Front (Question)

Accuracy

Back (Answer)

agreement of a measure value with an accepted value (target)

#2
Front (Question)

Precision

Back (Answer)

onsistency of a measurement made in different trials/ runs

#3
Front (Question)

Mean

Back (Answer)

Average Add all values up then divide by how many units added

#4
Front (Question)

SD (Standard Deviation)

Back (Answer)

When there is a value above or below the mean calculated based off of the mean and the number of units in the sampling

#5
Front (Question)

Standard deviation: Formulation

Back (Answer)

s= square root of E (x-xi)^2/n-1

#6
Front (Question)

Histograms

Back (Answer)

Frequency vs outcome

#7
Front (Question)

Frequency and outcome

Back (Answer)

Frequency - how often an outcome happened, on y axis Outcomes - what happened, - on x axis

#8
Front (Question)

Bell-shaped curves

Back (Answer)

Many histograms have a profile that looks like a bell-shaped curve as smaller bin sizes large number samples

#9
Front (Question)

1-3 Standard deviation

Back (Answer)

63.8% confident = 1 SD 95.5% confident = 2 SD 99.7% confident= 3 SD

#10
Front (Question)

Does averaging improve data?

Back (Answer)

Yes, as number of measurements (n) gets larger the range at any confidence gets smaller

#11
Front (Question)

Coefficient of variation (CV)

Back (Answer)

Formula: CV= SD/Mean *100 expresses error as % range at any confidence will be different for every type measurement

#12
Front (Question)

What is CV known as?

Back (Answer)

referred to as “the index of precision”

#13
Front (Question)

Spectrophotometry

Back (Answer)

Often used to determine concentrations - >less light-> higher concentration Shining light through sample and seeing how much light gets through

#14
Front (Question)

Visible light

Back (Answer)

Most common light used is visible to our eyes

#15
Front (Question)

What is the frequency range of visible light?

Back (Answer)

400-700 nm

#16
Front (Question)

Wavelengths

Back (Answer)

distance between high points

#17
Front (Question)

Which types of light aren’t seen?

Back (Answer)

UltraViolet (UV) and Infrared (IR) light

#18
Front (Question)

Transmittance formula

Back (Answer)

I/Io *100= transmittance T

#19
Front (Question)

Transmittance: Io

Back (Answer)

(reference/background) measured first - solvent alone

#20
Front (Question)

Transmittance: I

Back (Answer)

amount of light that gets through when the sample + solvent is in the light beam

#21
Front (Question)

Transmittance

Back (Answer)

fraction light that got through

#22
Front (Question)

Monochromators

Back (Answer)

Separate light into narrow range of wavelength (colors)

#23
Front (Question)

What types of monochromators are they

Back (Answer)

3 types: Prism, refraction grating, and light filters

#24
Front (Question)

Single Beam Spectrophotometer parts

Back (Answer)

Source Monochromator Slit before sample Slit after sample Detector