1.
Which of the following substances is a solid-gas mixture?
Lather
Bronze
Steel
Smoke
Answer: D
2.
In flowering plants, the stamen is made up of
anther and stigma.
anther and filament.
stigma and filament.
stigma and style.
Answer: B
3.
Power is defined as the rate at which
energy is used.
temperature rises.
a body travels.
a body cools down.
Answer: A
Power =
4.
Which of the following is characteristic of reflex action?
It happens slowly
It happens consciously
It takes a long path
It involves thinking
It is automatic
Answer: E
5.
Which of the following food substances would produce a red precipitate when heated with Millon's reagent?
Banana
Groundnut
Orange juice
Pineapple juice
Answer: B
Millon's reagent is a solution primarily used to detect the presence of tyrosine, an amino acid, in proteins. It works by reacting with the phenol group of tyrosine, producing a characteristic red or reddish-brown precipitate or coloration upon heating. The reagent is made by dissolving mercury in concentrated nitric acid and then diluting with water.
From the options provided, groundnut is the only protein and can test positive with Millon's reagent.
6.
A body of mass 50 kg falls through a height of 5 m. If the acceleration due to gravity is 10 ms-2, calculate the loss in potential energy.
50 J
250 J
500 J
2500 J
Answer: D
Potential Energy = Mass x Acceleration due to gravity x Height
Mass = 50 kg
Acceleration due to gravity = 10 ms-2
Height = 5 m
Potential Energy = 50 x 5 x 10 J
Potential Energy = 2500 J
7.
A system of farming that leads to continuous destruction of virgin forests is
mixed farming
mixed cropping
pastoral farming
shifting farming
Answer: D
8.
Soil aeration could be improved through
mulching
irrigation
soil drainage
fertilizer application
Answer: A
9.
Which of the following statements about the negative use of Science and Technology is correct? It
promotes good health.
promotes easy communication.
enable humans to use less energy in working.
creates things that are dangerous to the environment.
Answer: D
10.
An example of a source of energy which is non-renewable is
petroleum.
solar.
tide.
wind.
Answer: A
11.
The largest component of sweat is
glucose
oil
salt
urea
Answer: E
12.
Which of the following products is not excreted by the skin?
Water
Sweat
Urea
Common salt
Answer: E
13.
A liquid-liquid mixture can be seperated by
filtration
evaporation
sublimation
distillation
Answer: D
Fractional distillation or distillation is a method for separating a liquid from a mixture of two or more liquids. For example, liquid ethanol can be separated from a mixture of ethanol and water by fractional distillation.
14.
Which of the following changes does not occur in a girl at the age of puberty?
The breasts develop
The hips widen
Menstruation
The teeth becomes whiter
Answer: D
15.
Which of the following diseases is spread through air?
AIDS
Measles
Typhoid
Yaws
Answer: B
16.
The volume of a metal ball was determined by dropping it into a measuring cylinder containing 20 cm3 of water and the water level rose to 35 cm3. If the mass of the ball is 35 g, calculate its density.
1.0 g cm-3
1.6 g cm-3
1.8 g cm-3
2.3 g cm-3
Answer: D
Density =
Volume = Final Volume - Initial Volume
Volume = 35 cm3 - 20 cm3
Volume = 15 cm3
Mass = 35 g
Density =
Density = 2.33 g cm-3
17.
Brine is a saturated solution of
sodium chloride and carbon dioxide
calcium carbonate and water
sodium chloride and water
calcium carbonate and kerosene
Answer: C
18.
Use the information below to answer the question that follow.
A solid X reacted with a liquid Y to form a salt and water only. A portion of liquid Y turned blue litmus paper red. Solid X did not dissolve when a portion of it was placed in water and stirred.
Solid X could be said to be
an acid.
an alkali.
a base.
a salt.
Answer: C
19.
Which of these methods is used to separate insoluble solids from liquids?
Distillation
Evaporation
Filtration
Winnowing
Answer: C
You simply filter the liquid from the solid.

20.
It is easier to move a heavy load with a crowbar when the
effort distance is shorter than the load distance.
effort distance is longer than the load distance.
effort distance is equal to the load distance.
effort is equal to the load.
Answer: B
21.
Ice floats on water because
water is denser than ice
ice is denser than water
ice has the same temperature as water
ice has a lower temperature than water
Answer: A
22.
The washing away of the top soil by running water is called
erosion
rotation
plantation
weathering
Answer: A
23.
Which of the following ions is formed by the loss of 2 electrons?
Ca2+
S2-
K+
F-
Answer: A
Cations are positively charged and they lose electrons. The number of positive charges in the superscript indicates the number of electrons lost. Calcium (Ca) has 2 positive charges which indicates the lost of 2 electrons.
24.
Endoparasites in farm animals can be controlled by
drenching.
dipping.
dusting.
spraying.
Answer: A
Endoparasites are parasites that live in the tissues and organs of their hosts, such as tapeworms, flukes, and protozoans of vertebrates.
Drenching is the forced pouring of liquid preparations down the throat of an animal. Drenching can be used for all livestock. During drenching, the animal's head must be raised so that the liquid does not enter the lungs. A bamboo tube, gourd or bottle (glass or plastic) can be used for drenching ruminants and pigs.
25.
A mirror is used to direct the sun’s rays onto the classroom wall by
radiation
reflection
conduction
revolution
Answer: B
26.
Which of the following instruments is connected in parallel across a resistor in an electrical circuit?
Ammeter
Voltmeter
Ohmmeter
Galvanometer
Answer: B
Voltmeter: is used to measure the potential difference between two points in an electrical circuit and its connected in parallel in an electric circuit
Ammeter: is used to measure the electric current in an electric circuit and it is connected in series in an electric circuit
Galvanometer: is used to detect the presence of small electric current and voltage and its connected in series
Ohmmeter: is used to measure the electrical resistance
27.
Which of the following statements about a transistor is correct?
It can be used to amplify current.
It is similar to three diodes.
It consists of two leads only.
It has three junctions.
Answer: A
28.
The sun, the heavenly bodies and the planets form the
atmosphere
galaxy
milky way
solar system
universe
Answer: D
29.
Which of the following statements about the solar system is true? The
sun moves round the earth
planets move round the sun
planets move round the moon
sun moves in its orbit
Answer: B
30.
An example of leafy vegetable crops is
cucumber.
lettuce.
okro.
onion.
Answer: B
31.
The proper way of maintaining soil structure and fertility is termed as soil
conservation
depletion
profile
erosion
Answer: A
32.
During an eclipse of the moon, the
Sun and the moon are on one side of the earth
Earth and the sun are on one side of the moon
Sun comes between earth and moon in a straight line
Earth comes between sun and moon in a straight line
Answer: D
33.
How many states of matter do we have?
2
3
4
5
Answer: B
34.
Faeces is the
excretory products resulting from body activities
food which is digested
food in the mouth which is removed from the body
unwanted product of digestion which is removed from the body
Answer: D
35.
A man applied a force of 50 N to push a wheelbarrow through a distance of 6 m. Calculate the work done.
300 J
56 J
44 J
30 J
Answer: A
Work done = Force x Distance
Force = 50 N
Distance = 6 m
Work done = 50 x 6 = 300 J
36.
Excretion in animals involves the removal of
water from the body
urine and faeces from the body
blood from the body
waste materials from the body cells
Answer: D
37.
The use of resistance breeds of farm animals in controlling diseases is a
biological control method.
chemical control method.
cultural control method.
physical control method.
Answer: A
38.
Plastic materials may be used to make the handles of cooking utensils because they are
Hard
Poor conductors of heat
Attractive
Easy to wash
Not poisonous
Answer: B
39.
The property of water that causes mosquito larvae to float on it is
density.
viscosity.
surface tension.
volume.
capillarity.
Answer: C
Surface tension is the force or property of a liquid which makes the surface to behave as if it were a stretched elastic skin or membrane.
40.
Which of the following types of soil allows the fastest rate of drainage?
Clayey soil
Loamy soil
Black soil
Sandy soil
Humus
Answer: D
(a)
Study the organisms listed below:
Earthworm;
Sheep;
Cassava plant;
Grasshopper;
Man;
Hen.
Draw a food chain using four of the organisms
(b)
(i)
Name four types of forces apart from friction.
(ii)
Give three effects of a force.
(c)
A certain pupil in a classroom can see clearly on the blackboard only when he sits at the front.
(i)
State the eye defect the child is suffering from.
(ii)
Explain why the child is unable to see when he is far from the blackboard.
(iii)
How can the defect be corrected?
(a)
Cassava plant → grasshopper → hen → man
OR
Cassava plant → earthworm → hen → man
(b)
(i)
Types of forces apart from friction
1. Gravitational force/Force of gravity
2. Magnetic force
3. Electrostatic force
4. Centripetal force
5. Centrifugal force
6. Tension
7. Thrust
8. Weight
9. Cohesive force
10. Adhesive force
11. Surface Tension
(ii)
Effects of a force
1. It changes direction of a moving body
2. It increases speed of a body/causes a body to accelerate
3. It decreases speed of a body/causes a body to decelerate
4. It causes a moving body to stop
5. It causes a stationary body to move
6. It causes deformation/changes the shape of a body
(c)
(i)
Myopia/shortsight
(ii)
Eyeball is too long/eye lens too short so rays from far objects meet infront of the retina and therefore clear image is not formed.
(iii)
The defect can be corrected using a spectacle with concave or biconcave or diverging lenses which will refract the light to focus on the retina.
a)
i)
What is a hormone?
ii)
Copy and complete the following table.
| Name of hormone | Organ secreting hormone | Function of hormone |
| Adrenalin | ||
| Thyroxin | ||
| Insulin |
b)
Ammonia gas is prepared in the laboratory by heating ammonium chloride and calcium hydroxide.
i)
Write a balanced equation for the reaction.
ii)
How is ammonia gas tested in the laboratory?
iii)
State one use of ammonia.
c)
i)
Name four types of forces.
ii)
A boy used a catapult to kill a bird which was on a tree and it fell to the ground.
Give two forces involved in this process.
a)
i)
Hormones are chemical substances produced by special endocrine/ductless glands in the body to enable certain organs function properly.
ii)
| Name of hormone | Organ secreting hormone | Function of hormone |
| Adrenalin | Adrenal gland | Prepares the body for fear/flight/fright emergency/fight/defense |
| Thyroxin | Thyroid gland | Body metabolism/growth |
| Insulin | Pancreas/Islets of Langerhans | Regulates body sugar level/blood sugar level |
b)
i)
2NH4Cl + Ca(OH)2 → CaCl2 + 2NH3(g) + 2H2O
ii)
How to test for ammonia gas
1. Ammonia turns moist red litmus paper blue
2. Ammonia produces white fumes when it reacts with concentrated hydrochloric acid (HCl)
iii)
Uses of ammonia
1. For preparation of ammonium nitrate/fertilizers
2. Used in the textile industry
3. Used as a laboratory reagent
c)
i)
Types of forces
1. Force of gravity
2. Weight
3. Magnetic force
4. Electrostatic force
5. Frictional force
6. Centripetal force
7. Viscous force
8. Tensional/Elastic force
9. Adhesion
10. Cohesion
11. Centrifugal force
ii)
1. Tensional/Elastic force
2. Force of gravity
3. Frictional force
(a)
(i)
What is indiscriminate sex?
(ii)
Give two reasons why teenagers indulge in indiscriminate sex.
(b)
Name two sources each of
(i)
natural light;
(ii)
artificial light.
(c)
State three ways in which soil texture is important in crop production.
(d)
Write down the systematic name of each of the following chemical compounds:
(i)
FeS;
(ii)
CO;
(iii)
Cu2O;
(iv)
NaOH.
(a)
(i)
Indiscriminate sex is the act of having sexual intercourse with any person or having many/multiple/different sexual partners.
(ii)
Reasons why teenagers indulge in indiscriminate sex
1. Peer pressure
2. Lack of parental guidance
3. Poor financial status of parents/poor homes
4. Lack of sex education
5. Weak morals/exposure to pornographic material
(b)
(i)
Sources of natural light
1. Sun
2. Fireflies
3. Stars
4. Lightening
5. Glow worm
6. Volcano
Note: the moon is not a source of natural light
(ii)
Sources of artificial light
1. Heated filament/electric bulb
2. Firecrackers
3. Torchlight/flashlight
4. Buring charcoal
5. Lantern
6. Satellite
7. Wood fire
8. Lamp
(c)
Ways in which soil texture is important in crop production
1. It helps the farmer to know the type of farming method to use
2. It has an effect on water and air relationship
3. It influences the soil temperature
4. It influences the water holding capacities of the soil
5. Knowledge of soil texture is important in determining soil management practices to adopt
6. It helps the farmer to know the type of crop to plant
(d)
Systematic name of chemical compounds:
(i)
FeS → Iron (II) sulphide
(ii)
CO → Carbon (II) oxide
(iii)
Cu2O → Copper (I) oxide
(iv)
NaOH → Sodium hydroxide
(a)
Explain why a tomato plant is likely to wilt if too much fertilizer is applied to it.
(b)
(i)
Give two differences between electrical insulators and electrical conductors.
(ii)
State two effects of illegal electrical connections in the home.
(c)
Explain each of the following terms as used to describe change of state of matter:
(i)
condensation;
(ii)
freezing.
(d)
(i)
State two diseases of the circulatory system in humans.
(ii)
Mention two ways in which each of the diseases you have stated in (d)(i) can be prevented.
(a)
Why a tomato plant is likely to wilt if too much fertilizer is applied to it
Once two solutions of different concentrations come into contact, water molecules will flow from low to higher concentrated solution. Hence application of fertilizer makes the soil solution of higher concentration so water flow out of the plant by osmosis. The tomato plant plasmolyses/loses water and wilt.
Note
Plasmolysis describes a process involving a plant cell losing water content and therefore contracting and shrinking its cytoplasm and plasma membrane away from the inside of its cell wall. This occurs if the solution surrounding a plant cell is hypertonic or has a high concentration of solutes like salt.
(b)
(i)
Differences between electrical insulators and electrical conductors
| Electrical insulators | Electrical conductors |
| Does not conduct electricity | Conducts electricity |
| Has narrow conduction energy band | Has wide conduction energy band |
| There exists a wide forbidden energy gap between valence and conduction band | Has no forbidden energy gap |
| Electrons firmly bound to nucleus | Electrons loosely bound to nucleus |
| There are no free electrons | Has more free electrons |
(ii)
Effects of illegal electrical connections in the home
1. Overload of power supply
2. Drop in voltage of electricity
3. Leads to frequent power cuts
4. Leads to electrocution/electric shock
5. May cause fire outbreak
6. May damage electrical appliances
7. Leads to loss of revenue to government
(c)
(i)
Condensation is the change from the gas state to the liquid state.
(ii)
Freezing is the change from the liquid state to the solid state.
(d)
| Disease of the circulatory system | Prevention |
| High blood pressure (Hypertension) |
1. Regular exercise
|
| Low blood pressure (Hypotension) |
1. Regular exercise
|
| Piles/Haemorrhoids |
1. Eat a lot of fruits/vegetables
|
| Leukaemia/Blood cancer |
1. Avoid smoking
|
| Varicose vein |
1. Regular exercise
|
| Arteriosclerosis |
1. Regular physical exercise
|
a)
The diagram below are illustrations of two cells labelled A and B
Study the diagram carefully and answer the questions that follow.

i)
Name each of the parts labelled I, II, III and IV.
ii)
Which of the parts named in (a)(i) is the same as the parts labelled VI and IX in cell B?
iii)
Which of the cells is a plant cell?
iv)
Give two reasons for the answer given in (a)(iii).
v)
Tabulate two differences between the parts labelled I and V.
b)
The diagram below is an illustration of an experiment carried out in the laboratory.
Study the diagram carefully and answer the questions that follow.

i)
Read and record the:
(α) mass of irregular object (M) in I
(β) Volume of water (V1) in II
(γ) Volume of water (V2) in III
ii)
Determine the volume of the irregular object.
iii)
Calculate the density of the irregular object.
iv)
Name the instrument that could be used to measure the mass of an irregular object.
v)
State one precaution to be taken in performing the experiment.
c)
The following activities were performed in the laboratory by groups of pupils.
Study the activities and answer the questions that follow.
i) Camphor was heated.
ii) Wood was burnt.
iii) Iron nails were heated strongly.
iv) Sodium chloride was dissolved in water.
i)
Which of the following activities are:
(α) chemical processes;
(β) physical processes.
ii)
Give two reasons why the activities listed in:
(α) (i)(α) are chemical processes;
(β) (i)(β) are physical processes.
iii)
Give two examples of physical change that take place in your environment.
d)
A farmer cultivated soya bean, yam and maize on a farm in a rotational programme as illustrated below.
Study the diagram carefully and answer the questions that follow.

i)
Copy and complete the table.
ii)
List three principles to consider when planning this rotational programme.
iii)
Give two reasons for selecting the crop named for V in plot 1 year 3.
iv)
State one advantage of practising this farming system.
a)
(i) I = cell/plasma membrane, II = cytoplasm, III = nucleus , IV = vacuole
(ii) I is the same as VI (Cell membrane) and IV is the same as IX (Vacuole)
(iii) Diagram B
iv)
Reasons
1. Presence of large/ single vacuole (IX)
2. Presence of cell wall (V)
3. Rectangular shape
4. Nucleus pushed to the side/periphery
5. Cytoplasm pushed to the side
v)
Differences between parts labelled I (Cell Membrane) and V (Cell Wall)
| I (Cell Membrane) | V (Cell Wall) |
| Present in all types of cells, in humans, animals, plants, bacteria, etc. | Present only in plants and in some fungi, bacteria, algae. |
| Semi-permeable | Completely or fully permeable |
| Flexible | Thick and rigid |
| Made up of proteins and lipids | Made up of cellulose |
b)
i)
(α) mass of irregular object (M) in I = 40 g
(β) Volume of water (V1) in II = 40 cm3
(γ) Volume of water (V2) in III = 60 cm3
ii)
Volume of the irregular object = 60 cm3 - 40 cm3 = 20 cm3
iii)
Density =
Density = = 2 g/cm3 or 2 gcm-3
iv)
Instruments for measuring mass of an irregular object
1. Beam balance
2. Top pan balance
3. Electronic balance
iv)
Precautions to be taken in performing the experiment
1. The object should be lowered gently into the water in the cylinder
2. Volume of the liquid should be read from the base of the meniscus or at the eye level
3. The measuring cylinder should be placed on a flat surface
c)
i)
(α) chemical processes
II and III
(β) physical processes
I and IV
ii)
(α) Why chemical processes
1. The initial/original substance cannot be gotten back easily/irreversible
2. New substance formed
3. Change in mass
4. Accompanied by appreciable heat change
(β) Why physical processes
1. The initial/original substance can be gotten back easily/reversible
2. No new substance formed
3. No change in mass
4. Not accompanied by appreciable heat change
iii)
Examples of physical change
1. Expansion of metal on heating
2. dissolving sugar or salt in Water
3. Boiling of water
4. Melting of ice
5. Breaking/crushing of any Object
d)
i)
| Year\Plot | 1 | 2 | 3 |
| 1 | maize | soyabean | yam |
| 2 | yam | maize | soyabean |
| 3 | soyabean | yam | maize |
ii)
Principles to consider when planning for rotational programme
1. Deep rooted crops should be followed by shallow rooted crops
2. Crops of the same family/class should not follow each other
3. Crops that use the same soil nutrients should not follow each other
4. Leguminous crops should be included in the cycle
5. A fallow period may be included in the crop rotation programme
6. Crops which attract the same diseases and pests should not follow each other
iii)
Reasons for selecting the crop named V (Soyabean)
1. Soyabean is a legume and therefore builds up soil fertility
2. Yam is a deep rooted crop and should be followed by soyabean which is a shallow rooted crop
3. Yam is a heavy feeder and must have taken good part of the nutrients
4. Yam and soyabean belong different classes of crops and therefore not likely to attract the same pests and diseases
5. Improves soil structure
iv)
Advantages of crop rotation
1. Increases soil fertility
2. Enhances soil structure
3. Prevents soil erosion
4. Improves soil nutrients and nutrient uptake regulation
5. Controls the spread of pests and diseases
6. Controls weed easily
7. There is effective use of the land
8. Harvest of different types of crops on the same piece of land
a)
The diagrams below are illustrations of the male and female reproductive systems for humans.
Study them carefully and answer the questions that follow

i)
Name each of the parts labelled I, II, V, VI, VII and VIII.
ii)
State the function of each of the parts labelled III, IV and VII.
iii)
Name the labelled part where each of the following processes take place:
α)
Fertilization;
β)
Production of sperm;
γ)
Ovulation.
iv)
Name two common infectious diseases that affect both the male and female reproductive system.
b)
The diagrams below are illustrations of different devices used in the farm.
Study them carefully and answer the questions that follow.

i)
Give a common name for the devices illustrated.
ii)
Name each of the devices labelled A, B and C.
iii)
State one use of each of the devices named in (ii).
iv)
State two effects of the use of the device C on the soil.
v)
State two ways of prolonging the usefulness of the device labelled A.
c)
i)
Draw the symbols for each of the following electronic components:
α)
Resistor;
β)
(p-n junction) diode;
γ)
Cell;
δ)
Light Emitting Diode / LED.
ii)
Use the symbols drawn in (i) together with a switch to draw a circuit diagram to demonstrate forward biasing of a (p-n junction) diode and the light emitting diode.
iii)
State the effect of the resistor on the (p-n junction) diode and the light emitting diode when the circuit is closed.
d)
The following activities were carried out in the laboratory.
Study them carefully and answer the questions that follow.
I.
10 g of iodated salt was added to 150 ml of water in a baker. The mixture was stirred thoroughly.
II.
Vegetable oil was added to a quantity of water in a corked flask and shaken vigorously then allowed to stand for some time.
III.
Few grams of grinded charcoal was added to water in a beaker and stirred vigorously and then allowed to stand.
i)
State what will be observed in each of the activities I, II and III.
ii)
Suggest an aim for the experiment.
iii)
State one difference between what is observed in I and III.
iv)
State a method of separation for the activity carried out in II.
a)
i)
Identification of labelled parts
I → womb(wall)/uterus
II → fallopian tube/oviduct
V → ovary
VI → vas deferens/sperm duct
VII → penis
VIII → testis
ii)
Function of III(Cervix)
Contracts/relaxes during child birth/protects foetus
Function of IV(Vagina)
1. Receives the penis/semen/sperm during sexual intercourse/for sexual intercourse
2. Passage of foetus
3. Passage of menstrual fluid
Function of VII(Penis)
Passage of sperm/semen/for sexual intercourse
iii)
Name of part where
α)
fertilization occurs: fallopian tube/Oviduct
β)
sperm is produced: testis
γ)
ovulation occurs: ovary
iv)
Common infectious diseases that affect both the male and female reproductive system
1. Syphilis
2. Herpes (simplex virus)
3. Chancroid
4. Chlamydia
5. Gonorrhea/gonorrhoea
6. Candidiasis/whites/thrush
b)
i)
Common name of devices
Garden/farm tools/farm implements/farming tool
ii)
Name of labelled devices
A → Mattock
B → Peg
C → Hand fork
iii)
Uses of A (Mattock)
1. Removing of stump roots/for stumping
2. Cutting off exposed plant roots
Use of B (Peg)
For making spots on land (for correct spacing of plants)
Uses of C (Hand fork)
1. For removing weeds on garden beds
2. To loosen hard soil surface/for stirring
3. For mixing fertilizers around plants
iv)
Effects of the use of the device C (Hand fork) on the soil
1. Improves aeration
2. Improves water entry/circulation in soil
3. Improves structure of soil
v)
Ways of prolonging the usefulness of the device labelled A (Mattock)
1. Clean tool after use
2. Use it for the right work/purpose
3. Repair broken handle
4. Keep in a cool dry place
5. Oil metallic part before storage
6. Sharpen cutting edges
7. Ensure metallic blade is tightly fitted to wooden handle
8. Keeping tools in termite free area
c)
i)
Symbols of electronic components
α)
Resistor

β)
(p-n junction) diode

γ)
Cell

δ)
Light Emitting Diode / LED

ii)
Circuit diagram showing forward biasing

iii)
Effects of resistor on diode and LED
Resistor limits current in the circuit and thereby protects diode and LED from burning off.
d)
i)
Observations made in laboratory activities
I
10 g of iodated salt was added to 150 ml of water in a baker. The mixture was stirred thoroughly
Observation: The iodated salt dissolved (completely) in the water(forming a miscible solution/mixture)
II
Vegetable oil was added to a quantity of water in a corked flask and shaken vigorously then allowed to stand for some time.
Observations
1. The oil is suspended on the surface of the water (forming an immiscible solution/mixture)
2. The oil and the water will not mix together
3. The oil and the water separates into individual layers
III
Few grams of grinded charcoal was added to water in a beaker and stirred vigorously and then allowed to stand.
Observation: The charcoal does not dissolve in the water/It settles on the surface of the water forming mixture
ii)
Suggested aim for the experiment
1. To demonstrate the method of preparation of mixtures
2. To determine whether a homogeneous mixture/solution or heterogeneous mixture/solution would be formed
3. To prepare a mixture/solution
4. To determine if the solute will dissolve/mix with the solvent/water to form a solution/mixture
iii)
Differences between activity I and III
| I | II |
| The mixture/solution is Homogeneous | The mixture/solution is Heterogeneous |
| The solute/iodated salt dissolved (completely) in the solvent/water | The solute/charcoal did not dissolve in the solution/water |
iv)
Method of separation for the activity carried out in II
Use of separating funnel