1: Scientific Endeavour

Question 1

Scientific knowledge is…

Answer 1

Constructed based on evidence

Question 2

Scientific evidence is subject to…

Answer 2

Multiple interpretations

Question 3

Parts of the Bunsen Burner:

Answer 3

Barrel, collar, air hole, jet, base

Question 4

Luminous Flame

Answer 4

Air hole: Closed

Question 5

Non-luminous flame

Answer 5

Air hole: (Partially) Open

Question 6

Luminous flame:

Answer 6

With too little air, the gas mixture will not burn completely and will form tiny
carbon particles that are heated to glowing, making the flame luminous.

Question 7

Non-luminous flame:

Answer 7

Correctly adjusted Bunsen burner has a blue flame with
a light blue inner cone.

Question 8

Strike back

Answer 8

• occurs sometime when air holes are opened too widely
• the flame may burn inside the burner tube (strike back)
• flame changes to a green colour and produces a loud noise
• barrel could be extremely hot
• turn off gas immediately

Question 9

Independent Variable

Answer 9

Is the variable we want to change

Question 10

Dependent Variable

Answer 10

Is the variable measured in the experiment when the independent variable is changed

Question 11

Controlled Variable/s

Answer 11

Must be kept constant

Question 12

Accuracy

Answer 12

How close to he accepted value

Question 13

Precision

Answer 13

How close the results are to each other

Question 15

Systematic error

Answer 15

Errors that are consistent (e.g zero error)

Question 16

Random error

Answer 16

Errors that are unpredictable (e.g human reaction error)

Question 17

Zero error

Answer 17

The condition where the measuring
instrument registers a reading when there should not be any reading

Question 18

Parallax Error

Answer 18

Error in reading an instrument as a
result of not viewing the measurement scale from the correct position