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INVESTIGATING SCIENCE #, INVESTIGATING SCIENCE # # #, THE UNIVERSE, LIFE -…
INVESTIGATING SCIENCE
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Burning a candle floating in a closed container
Carry out a practical investigation to record both qualitative and quantitative data from observations?
Observations
Qualititative
flame extinguished
water level rose
change in pressure
Quantitative
time taken for extinguish
height of water level
Combustion Reaction
Fuel (paraffin Wax) + oxygen --> products + (ENERGY)
Characteristics of acids & bases
What are benefits and drawbacks of Qualitative and Quantitative observations?
Qualitative
Acid base indicator
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Quantitative
pH meter
pH scale
ranges from 0-14
pH 0-6 Acids
corrosive
1H+
hydrogen
pH 8-14 Bases
caustic
increased negative hydrogen + oxygen hydroxide ions
reflects the concentration of hydrogen 'ions' (atoms in solutions)
Reactions with carbonate (Co3)
carbonate with acid
observing patterns
elements and their properties
metals
good conductors
malleable
lustrous
ususally a solid at room temperature
usually high melting points
ductile
non-metals
non-conductors
insulator
dull
brittle (non-maluable)
Periodic table
Dmitri Mendeleev
drafted first modern periodic table
grouping elements with similar properties in columns
left gaps
reactivity (similar properties)
peer review and collaboration
unstable isotopes
nuclear decay
measured by radioisotope's half-life
half-life
irregular pattern
difficult to identify pattern
long half-life
e.g. carbon-14 has a half life of 5730 years
time taken for radioisotope to decay
radioisotopes
Carbon - 14
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6 protons (+)
8 neutrons (neutral)
Carbon - 12
6 Protons (+
6 Neutrons (neutral)
element with unstable nucleus
Stable
radioactive decay (nuclear decay)
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Nuclear radiation
Phlogiston Theory
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long standing assumption
materials that burn contain phlogiston
responsible for making it burn
what scientific investigation?
INVESTIGATING SCIENCE
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Key
MODULE 3
MODULE 4
MODULE 1
MODULE 2
THE UNIVERSE
LIFE
