1. Who proposed the planetary model of the atom?
a) Ernest Rutherford
b) Niels Bohr
c) J.J. Thomson
d) James Chadwick
2. Which subatomic particle has a positive charge?
a) Electron
b) Proton
c) Neutron
d) Nucleus
3. What is the approximate mass of an electron?
a) 1 atomic mass unit (amu)
b) 1/2 atomic mass unit (amu)
c) 1/1836 atomic mass unit (amu)
d) 1836 atomic mass units (amu)
4. Which of the following is NOT a fundamental particle?
a) Quark
b) Lepton
c) Photon
d) Neutrino
5. Who discovered the existence of neutrons?
a) Ernest Rutherford
b) Niels Bohr
c) J.J. Thomson
d) James Chadwick
6. What is the maximum number of electrons that can occupy the first energy level of an atom?
a) 2
b) 4
c) 8
d) 16
7. What is the charge of an atom that has gained two electrons?
a) -1
b) -2
c) +1
d) +2
8. What is the atomic number of an atom?
a) The number of protons in the nucleus
b) The number of electrons in the nucleus
c) The total number of protons and neutrons in the nucleus
d) The total number of electrons in the atom
9. What is an isotope?
a) An atom with a different number of neutrons
b) An atom with a different number of protons
c) An atom with a different number of electrons
d) An atom with a different number of energy levels
10. Which of the following best describes the electron cloud model?
a) Electrons are arranged in discrete energy levels around the nucleus.
b) Electrons are located in specific orbits around the nucleus.
c) Electrons are spread out in a cloud-like region around the nucleus.
d) Electrons are confined to specific regions within the nucleus.
Answers:
1. b) Niels Bohr
2. b) Proton
3. c) 1/1836 atomic mass unit (amu)
4. c) Photon
5. d) James Chadwick
6. a) 2
7. b) -2
8. a) The number of protons in the nucleus
9. a) An atom with a different number of neutrons
10. c) Electrons are spread out in a cloud-like region around the nucleus.
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a) Ernest Rutherford
b) Niels Bohr
c) J.J. Thomson
d) James Chadwick
2. Which subatomic particle has a positive charge?
a) Electron
b) Proton
c) Neutron
d) Nucleus
3. What is the approximate mass of an electron?
a) 1 atomic mass unit (amu)
b) 1/2 atomic mass unit (amu)
c) 1/1836 atomic mass unit (amu)
d) 1836 atomic mass units (amu)
4. Which of the following is NOT a fundamental particle?
a) Quark
b) Lepton
c) Photon
d) Neutrino
5. Who discovered the existence of neutrons?
a) Ernest Rutherford
b) Niels Bohr
c) J.J. Thomson
d) James Chadwick
6. What is the maximum number of electrons that can occupy the first energy level of an atom?
a) 2
b) 4
c) 8
d) 16
7. What is the charge of an atom that has gained two electrons?
a) -1
b) -2
c) +1
d) +2
8. What is the atomic number of an atom?
a) The number of protons in the nucleus
b) The number of electrons in the nucleus
c) The total number of protons and neutrons in the nucleus
d) The total number of electrons in the atom
9. What is an isotope?
a) An atom with a different number of neutrons
b) An atom with a different number of protons
c) An atom with a different number of electrons
d) An atom with a different number of energy levels
10. Which of the following best describes the electron cloud model?
a) Electrons are arranged in discrete energy levels around the nucleus.
b) Electrons are located in specific orbits around the nucleus.
c) Electrons are spread out in a cloud-like region around the nucleus.
d) Electrons are confined to specific regions within the nucleus.
Answers:
1. b) Niels Bohr
2. b) Proton
3. c) 1/1836 atomic mass unit (amu)
4. c) Photon
5. d) James Chadwick
6. a) 2
7. b) -2
8. a) The number of protons in the nucleus
9. a) An atom with a different number of neutrons
10. c) Electrons are spread out in a cloud-like region around the nucleus.
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๐8
Multiple choice exam questions from organic compounds
1. Which of the following is an ester?
(a) CH3CH2OH
(b) CH3COOH
(c) CH3COOCH3
(d) CH3CH2NH2
2. How are esters formed?
(a) Oxidation of alcohols
(b) Reaction of carboxylic acids with alcohols
(c) Hydration of alkenes
(d) Reduction of aldehydes
3. What is the general formula of an ester?
(a) RCOOH
(b) RCOOR'
(c) RNH2
(d) RCONH2
4. Which of the following is a carboxylic acid?
(a) CH3CH2OH
(b) CH3COOH
(c) CH3COOCH3
(d) CH3CH2NH2
5. How are carboxylic acids formed?
(a) Oxidation of alcohols
(b) Reaction of esters with water
(c) Hydration of alkenes
(d) Reduction of aldehydes
6. What is the general formula of a carboxylic acid?
(a) RCOOH
(b) RCOOR'
(c) RNH2
(d) RCONH2
7. Which of the following is an alcohol?
(a) CH3CH2OH
(b) CH3COOH
(c) CH3COOCH3
(d) CH3CH2NH2
8. How are alcohols formed?
(a) Oxidation of aldehydes
(b) Reaction of esters with water
(c) Hydration of alkenes
(d) Reduction of carboxylic acids
9. What is the general formula of an alcohol?
(a) RCOOH
(b) RCOOR'
(c) RNH2
(d) ROH
10. Which of the following is an aldehyde?
(a) CH3CH2OH
(b) CH3COOH
(c) CH3CHO
(d) CH3CH2NH2
Answer key:
1. c
2. b
3. b
4. b
5. a
6. a
7. a
8. c
9. d
10. c
1. Which of the following is an ester?
(a) CH3CH2OH
(b) CH3COOH
(c) CH3COOCH3
(d) CH3CH2NH2
2. How are esters formed?
(a) Oxidation of alcohols
(b) Reaction of carboxylic acids with alcohols
(c) Hydration of alkenes
(d) Reduction of aldehydes
3. What is the general formula of an ester?
(a) RCOOH
(b) RCOOR'
(c) RNH2
(d) RCONH2
4. Which of the following is a carboxylic acid?
(a) CH3CH2OH
(b) CH3COOH
(c) CH3COOCH3
(d) CH3CH2NH2
5. How are carboxylic acids formed?
(a) Oxidation of alcohols
(b) Reaction of esters with water
(c) Hydration of alkenes
(d) Reduction of aldehydes
6. What is the general formula of a carboxylic acid?
(a) RCOOH
(b) RCOOR'
(c) RNH2
(d) RCONH2
7. Which of the following is an alcohol?
(a) CH3CH2OH
(b) CH3COOH
(c) CH3COOCH3
(d) CH3CH2NH2
8. How are alcohols formed?
(a) Oxidation of aldehydes
(b) Reaction of esters with water
(c) Hydration of alkenes
(d) Reduction of carboxylic acids
9. What is the general formula of an alcohol?
(a) RCOOH
(b) RCOOR'
(c) RNH2
(d) ROH
10. Which of the following is an aldehyde?
(a) CH3CH2OH
(b) CH3COOH
(c) CH3CHO
(d) CH3CH2NH2
Answer key:
1. c
2. b
3. b
4. b
5. a
6. a
7. a
8. c
9. d
10. c
๐13
@ethio_entranceG12 English 29 Apr 24 ยท 08ยท33ยท00.pdf
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แจ6แ แญแแ แจแ แฒแต แ แ แฃ แจแฐแ แ แตแฐแณแฐแญ แจแฐแ แ แแ แแฐแ แแตแซ แจแแ แฐแแณ
แจ6แ แญแแ แจแฐแ แ แแ แแซแจแแ แฐแจแ แแแแแซ แแฐแ แจแฐแ 12 - 14/2016 แ.แ แฅแแฐแแฐแฅ แจแ แฒแต แ แ แฃ แจแฐแ แ แตแฐแณแฐแญ แตแแ แญแต แขแฎ แ แณแแแแข
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แจ6แ แญแแ แจแฐแ แ แแ แแซแจแแ แฐแจแ แแแแแซ แแฐแ แจแฐแ 12 - 14/2016 แ.แ แฅแแฐแแฐแฅ แจแ แฒแต แ แ แฃ แจแฐแ แ แตแฐแณแฐแญ แตแแ แญแต แขแฎ แ แณแแแแข
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แจ8แ แญแแ แจแฐแ แ แแ แแซแจแแ แฐแจแ แแแแแซ แแฐแ แฐแ 4 แฅแ 5/2016 แ.แ แฅแแฐแแฐแฅ แจแ แฒแต แ แ แฃ แจแฐแ แ แตแฐแณแฐแญ แตแแ แญแต แขแฎ แ แณแแแแข
แจ8แ แญแแ แจแฐแ แ แแ แแซแจแแ แฐแจแ แแแแแซ แแฐแ แฐแ 4 แฅแ 5/2016 แ.แ แฅแแฐแแฐแฅ แจแ แฒแต แ แ แฃ แจแฐแ แ แตแฐแณแฐแญ แตแแ แญแต แขแฎ แ แณแแแแข
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Forwarded from ๐๐๐ซ๐๐ค๐ข ๐๐ซ๐๐๐ข๐ญ๐ข๐จ๐ง๐๐ฅ ๐๐ฅ๐จ๐ญ๐ก๐๐ฌ ๐๐ก๐จ๐ฉ๐ฉ๐ข๐ง๐ ๐
Key Exam Book 2001-2006.pdf
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แ 2017 แ แ แฒแต แแแญ แจtopper tutor แแฐ Elevate Tutorial แแญแจแแ แฅแแแฐแ แแแแแแ แฐแแแ
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org.whiteglow.keepmynotes.apk
11.4 MB
Notepad notes, memo,
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