Unit 1(Experimental Design)

Question 1

What is the experimental process order?

Answer 1

Question > Research > Hypothesis > Experiment > Conclusion > Result

Question 2

Accuracy?

Answer 2

How close a value is to the true value

Question 3

Precise

Answer 3

How close a value is to another value

Question 4

Resolution

Answer 4

Smallest divosions on an instrument

Question 5

Calibration

Answer 5

Checking if the instrument has accurate values

Question 6

Repeatable

Answer 6

Experiment can be repeated using the same method

Question 7

Reproducible

Answer 7

Experiment result in similar products

Question 8

Control variable

Answer 8

A variable that is kept the same

Question 9

Independent variable

Answer 9

A variable that is altered

Question 10

Dependent variable

Answer 10

A variable that is measured

Question 11

Independent and Dependent variable axis

Answer 11

Independent(Horizontal) Dependent(Vertical)

Question 12

Random errors

Answer 12

Unpredictable variations caused by thongs such as human error

Question 13

Systematic errors

Answer 13

Consistent error caused by malfunctioning piece of equipment

Question 14

Zero error

Answer 14

Type of systematic error where reading doesnt reset to 0

Question 15

Anomaly

Answer 15

Something that is unusual and deviates from the normal. [One value is much higher or lower than the rest]

Question 16

Filtration

Answer 16

Separate insoluble solid from a liquid
Liquid that passes is called a filtrate
Solid that didnt pass is called a residue

Question 17

Crystallisation

Answer 17

Remove soluble solids from liquids[water and ionic compounds]
Get the solids from evaporating liquids
When the solution is super saturated it will begin to crystallise

Question 18

Simple distillation

Answer 18

Separate liquid from a soluble solid
Similar to crystallisation but you get the liquid
The water vapour will go through the condenser and condense
Pure water that is collected is called distillate

Question 19

Anti bumping granules

Answer 19

Small granules that ensure smooth boiling

Question 20

Fractional distillation

Answer 20

Used to separate two miscible liquid
The liquid withh the lowest boiling point is evaporated and collected first
Can be used to separate petroleum

Question 21

Fractional collumn

Answer 21

Temperature low at the bottom
Temperature high at the top
If the heater is set to 100 the water evaporates but the top of the fractional column is less than 100 so its condensed back into water

Question 22

Pure substance

Answer 22

A substance that contains only one chemical element or compound. Its melting temperature is definite

Question 23

Mixture

Answer 23

Two or more substances mixed together but not chemically combined