Download model answers year 9 practice examination

YEAR 9 PRACTICE EXAMINATION
MODEL ANSWERS
Question Answer
ONE
a.
b.
c.
d.
e.
f.
g.
h.
i.
j.
TWO
a.
Tripod, tongs, gauze mat, evaporating dish, safety goggles,
filter funnel, beaker
Dichotomous key
 2 way split
 Clear and unambiguous
12, 6.5, 23.5
0.4 mm, 54 mL
Bunsen burner, tripod, gauze, beaker
 Done in pencil
 Ruler used
 Not in 3 dimensions
 Drawn to size
Flame is hotter, no soot produced
So the flame is visible, cooler flame
Do not run or fool – injury possible
Wear the appropriate eye protection – eye safety
Report spills or breakages – safety
Follow teachers instructions – safety
1. Mirror
2. Slide
3. Cover slip
4. Coarse focus
5. Fine focus
6. Base
7. Eye piece
8. Lens
9. Condenser (diaphragm)
10. Stage
1. Take microscope slide
2. Place drop of iodine on slide
3. Bend back onion leaf
4. Cut off skin and place on drop
5. Lower cover slip at 45o onto skin
6. Check for air bubbles
(order may be different)
First row moving from left to right
1. Norno Beverlus
2. Norno Dallus
3. Norno Rajus
Second row
4. Norno Kentuckyus
5. Norno Californius
b.
c. i.
c. ii
c. iii
c. iv
c. v
c. vi
c. vii
d.
e.
f. i
f. ii
g. i
g. ii
g. iii
g. iv
g. v
THREE
a.
6. Norno Walawala
Third row
7. Norn Dakotus
8. Norno Yorkio
Herbivore – eats plants
Decomposer – release nutrients from dead animals
Omnivore – eat plants and animals
Producer – green plants make their own food
Carnivore – eat only animals
Plant plankton
Krill
Squid and Fish
King penguin, leopard seal, sperm whale
Leopard seal, krill, squid, fish, sperm whale
Leopard seal would eat more squid. Reduced squid numbers
for the sperm whale
Leopard seal and king penguin numbers would decrease, squid
numbers would increase, possible drop in numbers of krill, more
food for sperm whale, so increase in sperm whale numbers
Use of MRS GREN to argue case
M – movement
R – respiration
S – sensitivity
G – growth
R – reproduction
E – excretion
N – nutrition
(can use MRS C GREN) if required
Kingdom, Phylum, Class, Order, Family, Genus, Species
Structural – exoskeleton for excretion, lungs for gas exchange
Behavioural – clump together for moisture and warmth, stop
when meet surface, stay in dark to protect from predators and
avoid water loss
Critically endangered
Parrot
Eggs or young may be eaten
Loss or habitat, slow breeder
Ground dwelling, flightless, slow breeder
i. proton or neutron
ii electron
iii nucleus
iv proton or neutron
Electron
Negatively charged, orbits the nucleus, has almost no mass
Proton
Positively charge particle, mass of 1, found in the nucleus
Neutron
Has no charge, has a mass of 2 and found in the nucleus
b.
c.
d.
e.
f.
g.
h.
i.
j. a
j. b. i
j. b. ii
j. b. iii
FOUR
a.
Hydrogen H
Fluorine F
Oxygen O
Helium He
Calcium Ca
Sulfur S
Chlorine Cl
Sodium Na
Carbon C
Silicon Si
Metals – left hand side of Periodic Table
Non-Metals – right hand side of Periodic Table
Circled elements: copper, zinc, mercury, sodium, lead,
potassium
Physical properties: eg: colour, lustre, electrical and heat
conductivity, melting points and boiling points, state
Metals:
Shiny, malleable (bendy), ductile (drawn into wires) conduct heat
and electricity, silver in colour, usually solid at room temperature
Non-metals
Dull, brittle, do not conduct heat or electricity, various states at
room temperature, a variety of colours
i. water
ii. carbon dioxide
iii. nitrogen gas
iv. sulfuric acid
Elements:
Gold, sulfur, oxygen, hydrogen
Compounds:
Water, table salt, pure water, copper sulfate
Mixtures:
Salt water, milk, pepsi
H2 - 2 atoms
H2O - 3 atoms
CuSO4 – 6 atoms
Making for oxygen gas:
Add manganese dioxide to hydrogen peroxide
Testing for oxygen gas:
Place a glowing splint in the gas. If it reignites (catches fire)
then it is oxygen
The limewater would turn cloudy (and then clear again – but
seldom observed by students)
To remove carbon dioxide from the air
Condensation (water) produced from the combustion of the
candle wax (hydrocarbon).
It would be better to place it BEFORE the limewater because
some of the water vapour will be carried across from flask 3 to
flask 4
Moving car – kinetic energy
b.
c. i
c. ii
c. iii
d. i
d. ii
d. iii
e. i
e. ii
e. iii
f.
g.
h.
FIVE
a.
b.
Battery – chemical potential energy
Diver – gravitational potential energy
Heater – heat energy (but if fan heater could be electrical or
kinetic energy)
Kinetic Energy → Gravitational Energy
Kinetic Energy → Elastic Potential Energy
Gravitational Potential Energy → Kinetic Energy
Radiation
The hot air masses rise by convection currents
Plastic is a poor conductor of heat and the lights produce a lot of
heat
Graph must include:
Title
Both labelled axis (scale and units)
Vertical axis is temperature and horizontal is time
Scales evenly spaced
Points plotted correctly
Point joined with a smooth curve
Line graph
The substance is melting
600o C
This is where the second plateau (constant temperature) can be
seen
Gases expand to fill the spaces
Solids have a fixed shape
Liquids have no fixed shape and can be spread over a surface
A. Gas
B. Gas → Liquid
C. Liquid
D. Liquid → Solid
E. Solid
Molecules are moving from their fixed positions. In a liquid they
can move around
Solid → Liquid - melting
Liquid → Gas - evaporation
Gas → Liquid - condensation
Liquid → Solid - freezing
Solid → Gas - sublimation
Nebula – gas cloud left over from a supernova
Satellite – object (natural like a moon or artificial) that orbits a
planet
Constellation – unrelated star group that can be seen as a
picture in the sky
Comet – ball of rock and ice in elliptical orbit around the sun
Neutron star – pulsar – remains of a supernova
A year is the time taken to orbit the sun. Mercury is closer to the
Sun and therefore takes less time to orbit the sun hence its year
c.
d. i
d. ii
d. iii
e. i
e. ii
e. iii
e. iv
f.
g.
is shorter in time.
Sun, Earth and Moon labelled correctly with bulges shown to
indicate tidal movement.
the light rays need to be drawn correctly to shade the moon
Penumbra is the partial shade, Umbra is the total shade
A lunar eclipse can only occur at night because the Earth casts
a shadow on the Moon
Gravity
Hydrogen
It would engulf Earth and possibly extend out as far as Mars
Massive stars
Correctly joined up pointers and long axis of the Southern Cross
to drop a perpendicular line down to the Earth’s surface.
The South Celestial Pole is a fixed point in the sky around which
the stars appear to rotate.
The stars would rotate in an anticlockwise direction.
In a 24 hour period they would make one full rotation, so in 6
hours they would make a quarter of a rotation (90o)
The south celestial pole is only visible in the southern
hemisphere