Lesson 1: Measurement

Question 1

• A number that shows the size or amount of something. Usually the number is in
reference to some standard measurement,such as a meter or kilogram. And therefore,carrying a unit.

Answer 1

Measurement

Question 2

-is a system of measurement that uses the meter,liter, and gram as base units of length (distance), capacity (volume),and weight (mass) respectively. It is the most convenient system
because its conversion only involves increments of 10.

Answer 2

Metric system

Question 3

is a system of measurement that uses the inch/mile, quarts, and pounds as base units of length (distance),
capacity (volume), and weight (mass) respectively.

Answer 3

The english system

Question 4

Used to solve a mathematical problem or converting a measurement from one unit to another

Answer 4

Dimensional Analysis or Factor Units Method

Question 5

amount of matter in an object

Answer 5

Mass

Question 6

the pull of gravity on an object
• Measured using weighing balances

Answer 6

Weight

Question 7

Triple beam balance (1 decimal place)
• Top-loading balance (2 decimal places)
• Analytical balance (3 decimal places)

Question 8

The relative measure of hotness or coldness. Commonly expressed in Celsius, Fahrenheit and
Kelvin.

Answer 8

Temperature

Question 9

Force over area. Commonly expressed in atmosphere, pascal, pounds per square inch,Torr, among others.

Answer 9

Pressure

Question 10

Amount of space occupied by an object
• Liquids = graduated cylinder, pipette, beaker
• Regularly shaped solids = length, width, height
• Irregularly shaped solids = water displacement method

Answer 10

Volume

Question 11

• Density = mass per unit volume
• Specific gravity = ratio of density of a solid or liquid to
water at 4⁰C (1g/cm3)

Answer 11

Density and specific gravity

Question 12

Caused by incompetence of the
experimente

Answer 12

Operative or personal error

Question 13

Caused by non-ideal chemical or physical behavior of the reaction system

Answer 13

Method errors

Question 14

Caused by failures or imperfections of the measuring device

Answer 14

Instrumental errors

Question 15

• Inherent to the measuring apparatus
• Cannot be reduced by the experimenter, especially when finer measurements are obtained

Answer 15

Random or Indeterminate Errors

Question 16

• Those that are severe enough that the measurement or the entire analysis altogether has to be repeated
• Results in outliers, which are measurements that are isolated from all other measurements

Answer 16

Gross errors

Question 17

• Experimental value = calculated value or measured value
• Theoretical value = known value.
• A percentage very close to zero means you are very close to your targeted value

Answer 17

Percent error

Question 18

indicates how close a measurement is to the true or accepted value of the quantity being measured.

Answer 18

Accuracy

Question 19

refers to the closeness of measurements within a set of data. A measure of how close a series of measurements are to one another

Answer 19

Precision

Question 20

• Accuracy refers to the proximity of a measurement to the true value of a quantity.
• Precision refers to the proximity of several measurements to each other (Precision relates to the
uncertainty of a measurement).

Question 21

Expressed as whole numbers (5 test
tubes, 2 beakers, etc)

Answer 21

Counted

Question 22

Exact number but not always whole
numbers (12 inches per foot, 2.54 cm in an inch, etc)

Answer 22

Defined

Question 23

Those obtained from reading measuring devices

Answer 23

Measured

Question 24

•The term significant figures refers to the meaningful digits of a
measurement.
• When rounding calculated numbers, we pay attention to significant figures, so we do not overstate the accuracy of our answer