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chapter 1 the scientific endeavour(anna) - Coggle Diagram
chapter 1 the scientific endeavour(anna)
lab apparatus
bunsen burner - use for heating
wire gauze- support containers when heating
retort stand - to hold pieces of equipment
SCIENCE
study of
natural world
organisms
physical world
energy, matter
positive attitudes
curiosity
to learn science
objective(fair)
integrity(honest)
perseverance
open-minded
creative
patience
humble
knowledge gained from
observation
experiments
to describe ,
explain
world around us
SCIENTIFIC METHOD
scientific inquiry- questioning
observation/ questions
make a hypothesis
experiment , gather evidence
conclude
types of variable
dependent
what you want to
measure
controlled
what you want to
keep the same
independent
what you want to
change
technology
application of science
good
handphone
(improve communication)
medicine
bad
nuclear weapon
air pollution(cars)
hazard symbols
harmful/irritant
irritates the skin,eyes nose or respiration system
acute toxicity
cause harmful effects to body when breathed in , swallowed or on contact with the skin
corrosive
substance cause severe damage on contact with body parts
carcinogenic
causes breathing difficulties , infertility, birth defects , damage to organs or cancer
explosive
substances cause fire or explosion in contact with heat
gases under pressure
may explode when heated. may cause oxygen deficiency if gas is leaked in an enclosed space
flammable
substance catches fire easily. keep substance away from naked flame
oxidising substance
releases oxygen easily which can cause fire or explosion
environmental toxicity
can cause harmful effects to the environment
BUSEN BURNER
lightering a bunsen burner
connect bunsen burner to gas tap
2.turn collar to close the air hole
hold lighter over barrel, turn on the gas tap , light the lighter
close air hole
luminous flame
orange flame
1 more item...
open air hole
non-luminous flame
blue flame
1 more item...
factors affecting measurements
accuracy
measurement of how close a reading is to the true value
inaccuracy due to zero error
instrument gives a non- zero reading when the measured quantity should be zero
inaccuracy due to parallax error
wrong reading due to reading the instrument from the wrong angle
precision
measurement of how close one reading is to another when multiple readings are taken
