#Bernoulli's principle
Bernoulli's principle is a fundamental principle in fluid dynamics that states that as the speed of a fluid increases, its pressure decreases, and vice versa. In simple terms, it is about the relationship between the speed and pressure of a fluid in motion.
The formula for Bernoulli's principle is:
P + 1/2 * ρ * v^2 + ρ * g * h = constant
where:
P is the pressure of the fluid,
ρ is the density of the fluid,
v is the velocity of the fluid,
g is the acceleration due to gravity, and
h is the height of the fluid above a reference point.
In a nutshell, Bernoulli's principle describes how the total energy of a fluid flowing through a pipe or over an object remains constant along the flow path, meaning an increase in the fluid's speed results in a decrease in pressure, and vice versa. This principle has applications in various fields like aviation, meteorology, and engineering. 🌊✈️🔧
Bernoulli's principle is a fundamental principle in fluid dynamics that states that as the speed of a fluid increases, its pressure decreases, and vice versa. In simple terms, it is about the relationship between the speed and pressure of a fluid in motion.
The formula for Bernoulli's principle is:
P + 1/2 * ρ * v^2 + ρ * g * h = constant
where:
P is the pressure of the fluid,
ρ is the density of the fluid,
v is the velocity of the fluid,
g is the acceleration due to gravity, and
h is the height of the fluid above a reference point.
In a nutshell, Bernoulli's principle describes how the total energy of a fluid flowing through a pipe or over an object remains constant along the flow path, meaning an increase in the fluid's speed results in a decrease in pressure, and vice versa. This principle has applications in various fields like aviation, meteorology, and engineering. 🌊✈️🔧
የአዲስ አበባ ከተማ ፣ የአራዳ ክ/ከተማ የናቹራሎች 2016ዓም 2ኛ ሴሚስተር ሞዴል ፈተና (Model Question) ⬇️ ፡፡
☆Chemical Compounds Names -
★ Acetic acid formula
➷ CH3COOH
★ Aluminium hydroxide formula
➷ Al(OH)3
★ Acetate formula
➷ CH3COO-
★ Acetone formula
➷ C3H6O
★ Aluminium acetate formula
➷ Al2O(C2H3O2)4
★ Aluminum bromide formula
➷ AlBr3
★ Aluminum carbonate formula
➷ Al2(CO3)3
★ Aluminum chloride formula
➷ AlCl3
★ Aluminum fluoride formula
➷ AlF3
★ Aluminum formula
➷ Al
★ Aluminum iodide formula
➷ AlI3
★ Aluminum oxide formula
➷ Al2O3
★ Aluminum phosphate formula
➷ AlPO4
★ Amino acid formula
➷ R(NH2)-COOH
★ Ammonia formula
➷ NH4
★ Ammonium dichromate formula
➷ Cr2H8N2O7
BY ETHYL BENZOATE
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★ Acetic acid formula
➷ CH3COOH
★ Aluminium hydroxide formula
➷ Al(OH)3
★ Acetate formula
➷ CH3COO-
★ Acetone formula
➷ C3H6O
★ Aluminium acetate formula
➷ Al2O(C2H3O2)4
★ Aluminum bromide formula
➷ AlBr3
★ Aluminum carbonate formula
➷ Al2(CO3)3
★ Aluminum chloride formula
➷ AlCl3
★ Aluminum fluoride formula
➷ AlF3
★ Aluminum formula
➷ Al
★ Aluminum iodide formula
➷ AlI3
★ Aluminum oxide formula
➷ Al2O3
★ Aluminum phosphate formula
➷ AlPO4
★ Amino acid formula
➷ R(NH2)-COOH
★ Ammonia formula
➷ NH4
★ Ammonium dichromate formula
➷ Cr2H8N2O7
BY ETHYL BENZOATE
JOIN: @EthioSchool_12 😊
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Chemistry questions
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Choose the best answers
1. Which of the following concentrations indicates a basic solution?
(A) [H3O+]=5∗10−7M
(B) [H3O+]=5∗10−10M
(C) [OH−]=[H3O+]
(D) [OH−]=6.8∗10−9M
2. What acid-base definition describes a compound that accepts an electron pair?
(A) Lewis acid
(B) Lewis base
(C) Arrhenius acid
(D) Brønsted-Lowry base
3. Hydrochloric acid (HCl) is which of the following?
(A) A strong acid
(B) A strong base
(C) A neutral salt
(D) A weak acid
(E) A weak base
4. How does the Brønsted-Lowry theory of acids and bases describe acids?
(A) Brønsted-Lowry acids are proton acceptors when dissolved in water
(B) Brønsted-Lowry acids are electron acceptors when dissolved in water
(C) Brønsted-Lowry acids are proton donors when dissolved in water
(D) Brønsted-Lowry acids are acids that dissociate 100% in a solution
(E) Brønsted-Lowry acids are any compound that dissociates in water to yield a proton
5. By definition, a Lewis base is any species that __.
(A) accepts a pair of electrons from a Lewis acid
(B) donates a pair of electrons to a Lewis acid
(C) always produces a gas as a product
(D) removes hydrogens from a solution
(E) has a pH below 7
6. All acids have which phase label?
(A) (l)
(B) (s)
(C) (aq)
(D) (g)
7. According to the Lewis definition, acids are __.
(A) hydrogen donors
(B) electron pair donors
(C) hydrogen acceptors
(D) electron pair acceptors
(E) hydroxide acceptors
8. What is the Lewis definition of bases?
(A) increase the concentration of hydroxide ions in a solution
(B) electron pair acceptors
(C) increase the concentration of hydrogen ions in a solution
(D) electron pair donors
(E) accept hydrogen ions
9. What does amphoteric mean?
(A) A substance cannot act as an acid or a base
(B) A substance that is highly acidic
(C) A substance has a high concentration of neutrons
(D) A substance can act either as an acid or a base
(E) A substance is highly basic
10. What is a diprotic acid?
(A) An acid with 1 ionizable hydrogen
(B) A really strong base
(C) An acid with 2 ionizable hydrogens
(D) An acid with 3 ionizable hydrogens
(E) A really weak base
Don't just look, try them out too!
Join: @EthiopianStudentsTM
Choose the best answers
1. Which of the following concentrations indicates a basic solution?
(A) [H3O+]=5∗10−7M
(B) [H3O+]=5∗10−10M
(C) [OH−]=[H3O+]
(D) [OH−]=6.8∗10−9M
2. What acid-base definition describes a compound that accepts an electron pair?
(A) Lewis acid
(B) Lewis base
(C) Arrhenius acid
(D) Brønsted-Lowry base
3. Hydrochloric acid (HCl) is which of the following?
(A) A strong acid
(B) A strong base
(C) A neutral salt
(D) A weak acid
(E) A weak base
4. How does the Brønsted-Lowry theory of acids and bases describe acids?
(A) Brønsted-Lowry acids are proton acceptors when dissolved in water
(B) Brønsted-Lowry acids are electron acceptors when dissolved in water
(C) Brønsted-Lowry acids are proton donors when dissolved in water
(D) Brønsted-Lowry acids are acids that dissociate 100% in a solution
(E) Brønsted-Lowry acids are any compound that dissociates in water to yield a proton
5. By definition, a Lewis base is any species that __.
(A) accepts a pair of electrons from a Lewis acid
(B) donates a pair of electrons to a Lewis acid
(C) always produces a gas as a product
(D) removes hydrogens from a solution
(E) has a pH below 7
6. All acids have which phase label?
(A) (l)
(B) (s)
(C) (aq)
(D) (g)
7. According to the Lewis definition, acids are __.
(A) hydrogen donors
(B) electron pair donors
(C) hydrogen acceptors
(D) electron pair acceptors
(E) hydroxide acceptors
8. What is the Lewis definition of bases?
(A) increase the concentration of hydroxide ions in a solution
(B) electron pair acceptors
(C) increase the concentration of hydrogen ions in a solution
(D) electron pair donors
(E) accept hydrogen ions
9. What does amphoteric mean?
(A) A substance cannot act as an acid or a base
(B) A substance that is highly acidic
(C) A substance has a high concentration of neutrons
(D) A substance can act either as an acid or a base
(E) A substance is highly basic
10. What is a diprotic acid?
(A) An acid with 1 ionizable hydrogen
(B) A really strong base
(C) An acid with 2 ionizable hydrogens
(D) An acid with 3 ionizable hydrogens
(E) A really weak base
Don't just look, try them out too!
Electronics
_____ is a semiconductor device used to amplify or switch electronic signaks.
_____ is a semiconductor device used to amplify or switch electronic signaks.
Anonymous Quiz
29%
Diode
48%
Transistor
10%
Resistor
13%
Capacitor
🌟Important Increasing Orders
1️⃣ Ionization Energy
(i) Na, Al, Mg, Si
(ii) Li, B, Be, C, O, N, F, Ne, He (Ist I.P.)
(iii) Be, C, B, N, F, O, Ne, He, Li (IInd I.P.)
2️⃣ Electron Affinity
(i) I, Br, F, Cl
(ii) Cu, Ag, Au (EA, of Au is very high = 222 kJ mol–1)
(iii) O, S, F, Cl
(iv) N, P, O, S
3️⃣ Electronegativity
(i) As, P, S, Cl
(ii) I, Br, Cl, F
(iii) C, N, O, F
4️⃣ Oxyacids Of Halogen
1. Hypochlorous acid- HClO
2. Chlorous acid - HClO2
3. Chloric acid - HClO3
4. Perchloric acid - HClO4
5️⃣ Acidic Strength
HClO < HClO2 < HClO3 < HClO4
6️⃣ Oxidising Nature
HClO > HClO2 > HClO3 > HClO4
~ @EthiopianStudentsTM
1️⃣ Ionization Energy
(i) Na, Al, Mg, Si
(ii) Li, B, Be, C, O, N, F, Ne, He (Ist I.P.)
(iii) Be, C, B, N, F, O, Ne, He, Li (IInd I.P.)
2️⃣ Electron Affinity
(i) I, Br, F, Cl
(ii) Cu, Ag, Au (EA, of Au is very high = 222 kJ mol–1)
(iii) O, S, F, Cl
(iv) N, P, O, S
3️⃣ Electronegativity
(i) As, P, S, Cl
(ii) I, Br, Cl, F
(iii) C, N, O, F
4️⃣ Oxyacids Of Halogen
1. Hypochlorous acid- HClO
2. Chlorous acid - HClO2
3. Chloric acid - HClO3
4. Perchloric acid - HClO4
5️⃣ Acidic Strength
HClO < HClO2 < HClO3 < HClO4
6️⃣ Oxidising Nature
HClO > HClO2 > HClO3 > HClO4
~ @EthiopianStudentsTM