Lab Quiz 1 Flashcards Preview

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Flashcards in Lab Quiz 1 Deck (61)
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1

Hypothesis

A tentative answer to a key question.

2

Dependent Variable

The effect that changes as a result of varying the independent variable.

3

Independent Variable

What the experimenter changes; the cause.

4

Controlled Variable

Identified and kept constant throughout the experiment.

5

Meniscus

The curved surface of water in a cylinder due to surface tension.

6

Taring

Zeroing an instrument to compensate for the mass of something.

7

Mean

The average.

8

Range

The difference between the highest and the lowest data points.

9

Variance

Measures how far each number in the set is away from the mean.

10

Standard Deviation

Summarizes the variability in repetitive measurements.

11

Spectrophotometer

An instrument designed to detect the amount of light energy absorbed by molecules in a solution.

12

Percent Transmittance

A scale from 0 to 100.

13

Absorbance

A scale from 0 to 2.

14

Lambert-Beers Law

For a given concentration range absorbency is directly proportional to the concentration of solute molecules.

15

Standard curve

A graph with known properties used to find an unknown.

16

Significant figures

The number of important single digits in a scientific expression.

17

Line graph

A graph of linear values.

18

Histogram

A bar graph of frequency distribution which is on a horizontal axis.

19

Wavelength

Limits the resolving power of the microscope.

20

Resolution

The capacity of an optical instrument to distinguish two points that are close together.

21

Magnification

Makes things appear larger.

22

Contrast

The gradations of dark to light tone when viewing an image.

23

Working distance

The distance between the slide and objective.

24

Fixing

The use of the fixative to preserve the specimen in biology.

25

Stage

Where the specimen is place for viewing

26

Light source (dissecting microscope)

One projects light from above and another projects light from below the stage.

27

Body

Heavy metal column and parts encasing the lens system of the microscope

28

Ocular lens (dissecting microscope)

The lenses you look through our adjustable for individual differences. May have adjustment ring at its base.

29

Inter pupillary Distance

The distance between the pupils.

30

Objective lenses

Closest the specimen, located in the recesses at the bottom of the body.