💎 COHESION
Cohesion is the force of attraction between molecules of thesame substance or kind e.g molecules of mercury

💎 ADHESION
Adhesion is the force of attraction between molecules of different substances or kinds e.g molecules of water and glass_

EFFECT OF COHESION AND ADHESION

Counting of papers with moist finger
water rises up in the capillary tube while mercury falls in a capillary tube
water forms a concave meniscus in a glass tube while mercury forms a convex meniscus
This phenomena is possible because The adhesion of water molecule to glass is greater than their cohesion while the cohesion of mercury molecules is greater than their adhesion to glass

💎ANGLE OF CONTACT
💫Angle of contact is the angle(measured through the liquid)between the wall of a capillary tube and the tangent to the meniscus of the liquid in the tube
NOTE : - The meniscus could be concave or convex depending on the nature of the liquid.Angle of contact depends on the neatness of the wall of the glass tube
When a liquid has concave meniscus, the angle of contact is acute. When it has a convex meniscus, the angle of contact is obtuse.

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✅THE HOMOLOGOUS SERIES
A series of compounds in which successive members differ from each other by a specific structural unit (CH2) is called a homologous series e.g. alkanes, alkenes, alkynes, alkanols, etc. A member of a homologous series is called a homologue.
A homologous series has the following properties:
1. All members conform to a general formula.
e.g.
⚡Alkanes - CnH2n+2
⚡Alkenes - CnH2n
⚡Alkynes - CnH2n-2
⚡Alkanols - CnH2n+1OH; etc.
Where n is the number of carbon atoms.
2. Successive members differ in formula by -CH2 or 14grammes.
3. A general method of preparation exists for all members of a homologous series.
4. All members show similar chemical properties.
5. There is a gradual change in the physical properties of members of a homologous series with increasing number of carbon atoms.

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🖨 OXIDES

Oxides are formed when elements combine with oxygen. They can be classified into several groups namely;


🔻 Basic Oxides: they are oxides of metals. Do you react with acids to form a salt and water only. E.g

Na₂O + 2HCl + 2NaCl + H₂O


🔻 Acidic Oxides: they are oxides of non-metals. They react with water to form acids. They react with alkalis to form a salt and water only. E g

CO₂ + 2NaOH ---> Na₂CO₃ + H₂O


🔻 Amphoteric Oxides: they are metallic oxides which can behave as basic oxides and as acidic oxides i.e they can react with both acids and alkalis to form salts and water only. They include;

📌 Zinc oxide
📌 Aluminum oxide
📌 Lead (II) oxide
📌 Tin (IV) oxide

Memory tip: ZALT oxides


🔻 Neutral Oxides: these oxides are neither acidic or basic. Hence, they are neutral to litmus. This include; water, carbon (II) oxide and nitrogen (I) oxide.


🔻 Other higher oxides: other higher oxides resemble the peroxide in that they contain a higher proportion of oxygen than the ordinary oxides. E.g

📌 Iron (II) diiron (III) oxide [Fe₃O₄]
📌 Dilead (II) lead (IV) oxide [Pb₃O₄]

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Physics

Hooke’s law is an empirical law. True or False?
A) True✅
B) False
C) Cannot be determined
Solution
An empirical law is one which can be proven using an experiment, and Hooke's law happens to fit into this category. Option A is correct ✅

Hooke’s law states that?
A) stress is always proportional to strain✅
B) stress is proportional to strain before ultimate tensile strength
C) stress is proportional to strain under elastic limit
D) stress and strain are never directly proportional
Solution
A basic explanation of Hooke's law is that provided the elastic limit of an elastic material is not exceeded, the applied force is always proportional to the extension produced. However, it could be restated that *the stress experienced in an elastic material is proportional to the resulting strain*. For this reason, Stress α Strain, and the ratio of stress to strain is always CONSTANT. This constant is known as The Young's Modulus of the material. A is correct ✅

As the tension in an elastic string is increased from 100N to 180N, the string extends by 10cm. The work done in increasing the tension is ?
A) 8J
B) 10J
C) 14J✅
D) 18J

The load supported by a spring is increased from 50N to 90N . If the force constant for the spring is 2000N/m, the additional energy stored in the spring due to the increase in load is?
A)1.4J✅
B)0.9J
C)0.5J
D)0.4J
Solution
When the load is 50N
W = F²/2k
= 50²/2(2000)
= 0.625J
When the load is 90N
W = F²/2k
= 90²/2(2000)
= 2.025
∆W = 2.025-0.625
∆W = 1.4J✅

A 5m long wire is fixed to the ceiling. A weight of 10kg is hung at the lower end, and is 1m above the floor. The wire was elongated by 1mm. The energy stored in the wire due to stretching is?
A) zero B) 0.05J ✅C)100J D) 500J
Solution
elongation (extension) = 1mm = 1×10-³m
Force = 10kg×10m/s² = 100N
ENERGY stored = ½Fe
= ½×100×10-³
= 0.5×10-¹
= 0.05J✅

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📒Alloy
An alloy is a substance prepared by adding one or more element to a base or parent metal to obtain desirable products

🌟Brass -Cu and zn
Use for making moving parts of clocks and watches

🌟Bronze- Cu and Sn
For making coins and medal

🌟 Duralumin- Al, Cu ,Mg Mn
For construction of air craft, ships and machineries

🌟Steel- Fe and C
For construction of bridges ships and machineries

🌟 permallory- Fe and Ni
For making electromagnet

🌟Alnico -Fe,Al,Ni,Co
for making permanent magnet

🌟Soft solder - Pb and Sn
For welding and plumbing

🌟Type metal -Pb , Sb , Sn
For printing

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1.which of the following is use for the construction of bridges

A. Bronze

B. Steel✅

C. Soft solder

D. Alnico


2.coinage bronze is made up of cu, zn and

A. Al
B. Be
C. Sn✅
D. Na

3.an alloy is usually regarded as
A. A compound
B. A set of element
C. Uniform mixture ✅
D. None of the above

4.which of the following is use for printing
A. Type metal✅
B. Alnico
C. Duralumin
D. Brass


5.Galena is an ore of
A.copper
B.lead✅
C. Aluminum
D. Tin

6.potassium is very hard to extract with electrolysis because
A. It is soft
B. It is deliquescent
C. It evaporates fast
D. It is very reactive✅

7.Haber process is use to produce
A. Sulfur
B. Ammonia✅
C. Sodium bicarbonate
D. Nitrogen

8.calcium react directly with nitrogen to form
A. Ca3N3
B. Ca2N3
C. Ca3N2✅
D. Ca3N

9.most metal exist in nature as

A. Crust
B. Alloy
C. Ores✅
D. Felspar

10.Tin is purified by
A. Remelting✅
B. Concentrating
C. Roasting
C. All of the above

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🔰 Inorganic Chem Question Drill


1. Hydrogen was named by

A) Priestly
B) Lavoisier✅
C) J.J. Thompson
D) Cavendish

2. Which of the following metals would not liberate hydrogen from water or steam?

A) iron
B) magnesium
C) copper✅
D) zinc

3. What process is used in the industrial production of hydrogen in large quantities

A) haber process
B) Bosch process✅
C) frasch process
D) ostwald process

4. Synthesis gas differ from water gases because

A) they are composed of different gases
B) synthesis gas is more reactive
C) they have different mode of preparation✅
D) synthesis gas contains less hydrogen

5. What step in Bosch process is spontaneous

A) oxidation of steam
B) reduction of carbon
C) production of water gas
D) reduction of steam✅

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🛑very reactive metal include
🔗potassium
🔗sodium
🔗 calcium
🔗magnesium
🔗 Aluminum
Note |🌟The above are metals are extracted by electrolysis of fused hydroxide, chloride or oxides

🛑moderately reactive metals include
aluminium
⚡zinc
⚡ iron
⚡tin
⚡lead
Note🔗the above metal are extracted by Roasting of their trioxocarbonate and sulphide to form oxides .this is done by the reduction of oxides by carbon or carbon (ii) oxide

🛑less reactive metals include
🥇 copper
🥇 Mercury
🥇silver
🥇gold
The above metals can be extracted by Roasting in air of their sulphide while some like Au and Ag exist as free element .
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NITROGEN AND IT`S COMPOUNDS 🔆📝

INTRODUCTION
-Nitrogen is element 7 in the periodic table and it occurs majorly as a free element in nature.
- it makes up about 78% of the volume of air in the atmosphere,
- free nitrogen is important in the atmosphere because it helps to dilute oxygen to the point where combustion and oxidation of metals are reasonably slow,
- Nitrogen occurs in its combined forms and its one of the major component present in proteins of both plants and animals

LABORATORY PREPARATION OF NITROGEN🔔
This can be done in various ways which includes
-liquefaction of air
-Thermal decomposition of NH4NO2( ammonium dioxonitrate iii)
- Reduction of the oxide of nitrogen
- Thermal decomposition of ammonium heptaoxo dichromate vi
👇👇

1 liquefaction of air; The air sample that is collected can be separated using two methods

a Physical method
The air is enclosed in a container and is converted into liquid mixture by reducing the temperature and increasing the pressure.
when converted to liquid form they are separated by fractional distillation. This makes each constituent of air to boil out then liquid in nitrogen is obtained

b Chemical methods
Components of air can be obtained by using chemical reagent to separate or absorb the different components of air
-CO2 can be obtained by using caustic soda (NaOH)
- Oxygen can be obtained by using
a alkaline pyrogallol( 1,2,3- trihydroxybenzene)
b burning phosphorus
c heated copper
-water vapour in air can be absorbed using drying agent such as CaCl2

NOTE‼️Nitrogen and noble gases cannot be absorbed by chemical reactant because they are unreactive.
The reactive component can be separated by physical method( fractional distillation)

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