Chem Lab Exam 1

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33 Terms

1

To calculate slope in excel:

= slope(y values, x values)

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2

To calculate y intercept in excel

= intercept(y values, x values)

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3

To calculate average in excel

= average(values)

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4

Standard Deviation=

sqrt (value-average)²+ …/total number-1

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5

Standard deviation function

STDEV.S

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6

slope intercept equation

y=mx+b

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7

Percent Error

(measured value- true value)/true value) *100

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8

Absolute Value

actual value-measured value

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9
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100 ml beaker

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10
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50 ml graduated cylinder

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11
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10 ml volumetric flask

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12
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50 ml buret

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13
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transfer pipet

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14
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10 ml volumetric pipet

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15
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analytical balance

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16
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Pan balance

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17
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50 ml Erlenmeyer Flask

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18
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Test tube

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19

How to measure with volumetric pipet

  1. Attach bulb to the top

  2. Extract liquid to meniscus

  3. Transfer liquid

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20

Accuracy

How close measured value is to the true or accepted value

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21

Precision

How consistent the data is within each other

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22

How to calculate accuracy

Absolute Error

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23

How to calculate precision

use standard deviation, smaller value = more precise

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24

Percent Composition in unknown mixtures

mass of component/ total mass of mixture *100

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25

difference between gravitational filter and vacuum filter

  • Gravity filter uses gravity to move liquid through the filter

  • Vacuum filter uses vacuum to create pressure to draw the liquid through the filter

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26

Theoretical Yield

Determine the moles of element—use molar ratio as converstion factor— Convert mols to grams

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27

Yield Percent

Actual yield/theoretical yield *100

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28
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29
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gravity filter

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30
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vacuum filter

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31
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crucible

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32
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bunsen burner

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33
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watch glass

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