Chem 2.0 Vocab

Question 1

Angstrom symbol and x10

Answer 1

Å Small Unit of length used for measuring the diameter of atoms and molecules 1 x 10 -10m

Question 2

Accuracy

Answer 2

How close a measured value is to the answer (accepted value )

Question 3

Precision

Answer 3

How close a series of measurements are are to one another

Question 4

Sucrose
density?

Answer 4

Common table sugar
1.59 g/cm3

Question 5

Experimental value

Answer 5

Quantities measured during an experiment

Question 6

Accepted value

Answer 6

(Also called theoretical value) correct value T.V.

Question 7

Percent error

Answer 7

Ratio of an error to an accepted value times 100%

Question 8

Error

Answer 8

Difference between theoretical and experimental value

Question 9

Significant figures/digits

Answer 9

Number of all known digits (numbers) reported in a measurement PLUS one estimated digit

Question 10

Graph

Answer 10

Visual display of data

Question 11

Circle graph

Answer 11

Shows parts of a fixed whole
Called PIE CHART circle divided into wedges

Question 12

Bar graph

Answer 12

Shows how a quantity varies with time, location, or temperature

Question 13

Dependent variables

Answer 13

Quantity measured and appears on vertical axis
Called y axis or ORDINAte

Question 14

Independent variable

Answer 14

Time, location, temperature ect
Appears of x axis Horizontal
Or abscissa

Question 15

Best fit line

Answer 15

Line drawn so many points fall above the line as bellow it

Question 16

Continuous

Answer 16

Points on the graph are connected

Question 17

Interpolation

Answer 17

Read data that falls between the measured points,

Question 18

Extrapolation

Answer 18

Extend the line on a graph beyond the plotted points and estimate values for the variables