scientific endeavour

Question 1

qualitative data

Answer 1

• quality
• no numerical values
• observation from senses

Question 2

quantitative data

Answer 2

• quantity
• numerical value
• measured by apparatus

Answer 3

changed variable

Question 4

dependent variable

Answer 4

measured variable

Question 5

controlled variable

Answer 5

remains the same throughout

Question 6

SI unit for time

Answer 6

seconds(s)

Question 7

SI unit for temperature

Answer 7

kelvin(K)

Question 8

SI unit for mass

Answer 8

kilogram(kg)

Question 9

SI unit for length

Answer 9

millimeter(mm)

Question 10

SI unit for volume

Answer 10

meter cube(m3)

Question 11

parallel error

Answer 11

measurement viewed from the wrong angle

Question 12

zero error

Answer 12

occurs when a instrument gives a non zero at the start

Question 13

random error

Answer 13

factors like unpredictable environment conditions and human reaction time

Question 14

steps to use a Bunsen burner

Answer 14

1 check that there are no cuts or slits on the rubber tubing
2 turn the collar to close the airhole fully (prevent strike back)
3 turn on the gas tap
4 turn the collar open, to open the air hole when flame is lit (oxygen supports burning)

Question 15

luminous flame

Answer 15

bright (orange/yellow) - unsteady flickering, visible, produce soot, very hot

Question 16

non-luminous flames

Answer 16

not so bright (blue) - steady, hotter than luminous flame, hottest part is the tip of blue zone