WAEC / GES INFO ℹ️

2021-11-11 08:39:16 Q6a
i.
Inert gas is an atom that has fully filled shell in it's neutral state. eg Neon , Argon, Hellum

Valency is defined as the combining power of an element

ii
Mass number = Atomic No_ + Neutron No_
= 6 + 7
Mass number = 13

Electron number = 6 because proton number is equal to electron number at the neutral state of atom

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b. Oxidation number

1. H2SO4
2(1) + x + 4(-2) = 0
2 + x - 8 = 0
x = 8 - 2
x = 6
The oxidation number of S is +6

2. Na2CO3
2(1) + x + 3(-2) =0
2 + x -6 = 0 on
x = 6 - 2
x = 4
The oxidation number of C is +4

3. SO4²–

x + 4(-2) = -2
x -8 = -2
x = -2 + 8
x = 6
The oxidation number of S is +6

ii. Atomic structure of Sulphur
2 electrons on the first Shell
8 electrons on the second shell
6 electrons on the third shell


C
i. Neutralization reaction is a reaction between an acid and base to produce salt and water

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ii
2Na + 2HCl --> 2NaCl + HOW

NaOH + HCl --> NaCl + H2O

di. Types of force
Tensional force
Gravitational force
Magnetic force
Upthrust
Frictional force

ii

Tensional force
Frictional force
Gravitational force Open / Comment

2021-11-11 08:39:16 ANSWERS TO THE INTEGRATED SCIENCE QUESTIONS
PART II

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Q2a
i. An acid is any substance that dissolves in solution to produce hydrogen ions

ii. _difference between acid and base should be in table form_

ACID
1. It has sour taste
2. It turns blue litmus paper red
BASE
1. It has bitter taste
2. It turns red litmus paper blue

bi. Pressure is defined as the force acting normally or perpendicular per unit area of a surface

ii. Pressure = force ÷ area
= 200N ÷ 50m²
= 4Nm–² or 4N/m²
C. Unicellular organisms are organisms which contain only one living cell. eg Amoeba
Multicellular organisms are organisms which contain many living cell. eg Human

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Q3.a. Particles of matter
1. Molecules
2. Ions
3. Atoms

b . Hereditary features
1. Height
2. Colour of eyes
3. Intelligence
4. Shape of nose

C. Energy transformation
1.chemical energy --> electrical energy.
2. Solar energy --> electrical energy
3. Electrical energy --> heat + light energy
4. Kinetic energy --> sound + light energy

di. Digestive enzyme is a biological catalyst which speeds up the digestion of food substances in the body of an animal

ii. Examples Of digestive enzyme
1. Pepsin
2. Maltese
3. Amylase
4. Rennim

iii. _Difference between conduction and radiation should be in a tabular form_
Conduction
1. Requires material medium
2. The process is relatively slow
Radiation
1. Does not requires material medium
2. The process is relatively fast

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Q4a
_Difference between plants and animals should be in table form_
Plants
1. Have a cell wall
2. Contain chlorophyll
3. Manufacture their own food
4. Have large vacuole
5. Absorb carbon dioxide during photosynthesis
Animals
1. Do not have a cell wall
2. Don't have chlorophyll
3. Depend on plants for food
4. Have small vacuole
5. Inhale oxygen and release carbon dioxide

bi
Compound is a substance formed by the chemical combination of two or more elements in definite proportion. eg HCl , NaCl , Ca(OH)2
ii
An element is a substance that is made up of only one kind of atoms..eg Calcium, Hydrogen, Sodium, Argon


Ci. _Difference between insulators and conductors should be in table form_
Insulators
1. Do not conduct electricity
2. Has no free movement of electrons
Conductors
1. Conduct electricity
2. There is free movement of electrons

ii
Density = mass ÷ volume
But volume of stone = 75cm² - 60cm²
So volume of stone= 15cm²
Density. = 60g ÷ 15cm²
= 4gcm–² or 4g/cm ²
di
Magnetic field is a region or space around a magnet within which magnetic substance experience a magnetic force

ii. 1. Induction 2. Strocking. 3. Magnetic induction

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Q5a
i. Atomic structure of oxygen
2 electrons on the first Shell
6 electrons on the outermost shell)

ii. 8 protons + 8 electrons + 2 electrons
8 + (-8) + (-2)
0+ (-2)
= -2

bi. Arrangements of the liquids in the bottle
Liquid Z( 1.0 gcm–³)
Liquid X ( 1.5 gcm–³)
Liquid Y (3.0 gcm–³) the arrangements depend on the densities if the liquids

Ci.
The number protons and number of electrons in atoms are equal. The positively charged protons neutralize the negatively charged electrons ,hence making the atoms Electrical neutral

ii
1. CuO. -----> Copper (II) oxide
2. SO2. ------> Sulphur (IV) oxide

di
Workdone. = Force × distance
= 250N × 20m
= 5000Nm or 5000 J

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2021-11-11 08:39:16 PREDICTABLE QUESTIONS FOR INTEGRATED SCIENCE (both theory & objectives)
BECE 2021

EAGLE EYE SOLUTION TEAM

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2021-11-10 21:02:50 Good evening
More predictable questions loading.
Direct your friends and your junior brothers and sisters to this channel for help.
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2021-11-06 04:43:37 PREDICTABLE QUESTIONS FOR ASANTE TWI (both theory & objectives)
BECE 2021

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2021-11-03 15:55:52 Update

2021 NOVDEC Centers are out
Use the link to check yours


https://registration.ghanawaec.org/wassce/AddmissionNotice.aspx

However, 2021 NOVDEC late registration has been extended to 4th November

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2021-11-03 00:01:17 Just In
Rescheduling of Reopening Arrangements for Continuing Levels 200 And 300 students for the 1st Semester of The 2021/2022 Academic Year
#PRINCOF

In addition, Colleges of Education 2021/2022 Academic Year Admission List Out.

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2021-11-01 19:02:06 Good afternoon
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2021-10-31 16:01:06 Good morning
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2021-10-30 21:22:33 This is fake. Kindly debunk and treat it with all the contempt it deserves, thanks

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