- 1. Chemistry is the branch of science that deals with the composition, structure, properties, and reactions of matter. It is often called the central science because it connects and overlaps with other natural sciences such as physics, biology, and geology. Chemistry plays a crucial role in understanding the natural world, developing new technologies, and improving our quality of life. From the smallest subatomic particles to the vast complexities of organic compounds, chemistry explores the building blocks of everything around us, helping us to better comprehend the mysteries of the universe.
What is the atomic number of oxygen?
A) 10
B) 8
C) 6
D) 12
- 2. What is the chemical symbol for gold?
A) Al
B) Ag
C) Ge
D) Au
- 3. What is the molecular formula of water?
A) H2O
B) CH4
C) N2
D) CO2
- 4. Which of the following is a halogen?
A) Calcium
B) Potassium
C) Nitrogen
D) Fluorine
- 5. Which subatomic particle has a positive charge?
A) Electron
B) Neutron
C) Proton
D) Photon
- 6. What is the pH of pure water?
A) 7
B) 5
C) 10
D) 3
- 7. What is the process of a solid turning into a gas called?
A) Sublimation
B) Vaporization
C) Condensation
D) Deposition
- 8. Which element is a primary component of organic compounds?
A) Iron
B) Carbon
C) Magnesium
D) Argon
- 9. What does the atomic number represent?
A) Number of neutrons
B) Atomic mass
C) Number of protons
D) Number of electrons
- 10. What is a substance that cannot be broken down into simpler substances by chemical reactions?
A) Element
B) Atom
C) Compound
D) Molecule
- 11. What is the SI unit of measurement for amount of a substance?
A) Mole
B) Gram
C) Liter
D) Kelvin
- 12. What type of bond involves the sharing of electrons between atoms?
A) Metallic
B) Ionic
C) Hydrogen
D) Covalent
- 13. What is the atomic number of carbon?
A) 6
B) 8
C) 14
D) 12
- 14. What is the main component of natural gas?
A) Butane
B) Propane
C) Ethane
D) Methane
- 15. What is the unit of measurement for electric current?
A) Volt
B) Watt
C) Ohm
D) Ampere
- 16. What is the lightest element in the periodic table?
A) Hydrogen
B) Oxygen
C) Helium
D) Nitrogen
- 17. What is the study of carbon-containing compounds called?
A) Analytical chemistry
B) Organic chemistry
C) Physical chemistry
D) Inorganic chemistry
- 18. What is the SI unit of pressure?
A) Joule
B) Newton
C) Watt
D) Pascal
- 19. Which element is the most abundant in Earth's atmosphere?
A) Hydrogen
B) Carbon
C) Oxygen
D) Nitrogen
- 20. What is the chemical formula of table salt?
A) CO2
B) H2O
C) NaCl
D) NH3
- 21. What is the process by which a substance changes from a gas to a liquid?
A) Sublimation
B) Condensation
C) Melting
D) Evaporation
- 22. Which metal is the best conductor of electricity?
A) Gold
B) Silver
C) Aluminum
D) Copper
- 23. What is the chemical symbol for iron?
A) Cu
B) Ag
C) Au
D) Fe
- 24. What is the boiling point of water in Celsius?
A) 50 degrees
B) -100 degrees
C) 0 degrees
D) 100 degrees
- 25. Who is known as the father of modern chemistry?
A) Antoine Lavoisier
B) Marie Curie
C) Dmitri Mendeleev
D) Robert Boyle
- 26. What is the chemical symbol for silver?
A) Au
B) Fe
C) Cu
D) Ag
- 27. Which element is essential for human life and is found in hemoglobin?
A) Iron
B) Potassium
C) Calcium
D) Sodium
- 28. What is the branch of chemistry that deals with the study of matter and energy?
A) Organic chemistry
B) Analytical chemistry
C) Physical chemistry
D) Inorganic chemistry
- 29. What is the process through which plants convert sunlight into energy called?
A) Fermentation
B) Combustion
C) Respiration
D) Photosynthesis
- 30. Which of the following is a noble gas?
A) Helium
B) Chlorine
C) Oxygen
D) Nitrogen
- 31. What is the SI unit of measurement for mass?
A) Gram
B) Kilogram
C) Pound
D) Newton
- 32. What is the smallest particle of an element that retains its chemical properties?
A) Neutron
B) Molecule
C) Atom
D) Proton
- 33. Who is credited with the discovery of the electron?
A) J.J. Thomson
B) Marie Curie
C) Antoine Lavoisier
D) Robert Boyle
- 34. What is the measure of disorder in a system called?
A) Pressure
B) Entropy
C) Temperature
D) Volume
- 35. Which scientist proposed the modern periodic table?
A) Albert Einstein
B) Isaac Newton
C) Dmitri Mendeleev
D) Niels Bohr
- 36. What does the chemical formula H2O represent?
A) Carbon Dioxide
B) Water
C) Methane
D) Hydrogen Peroxide
- 37. What is the process of converting sugar into alcohol and carbon dioxide called?
A) Fermentation
B) Oxidation
C) Combustion
D) Esterification
- 38. Which element has the atomic symbol K?
A) Potassium
B) Boron
C) Phosphorus
D) Krypton
- 39. Which scientist proposed the modern atomic theory?
A) Albert Einstein
B) Marie Curie
C) Niels Bohr
D) John Dalton
- 40. What is the molecular formula of sulfuric acid?
A) H2O2
B) H2SO4
C) NaCl
D) HCl
- 41. Which isotope is commonly used in radiocarbon dating?
A) Carbon-14
B) Potassium-40
C) Uranium-235
D) Lead-206
- 42. What is the unit for measuring the energy content of food?
A) Watt
B) Volt
C) Joule
D) Calorie
- 43. What is the molecular formula of glucose?
A) CO2
B) H2O
C) C6H12O6
D) NaCl
- 44. Which element is commonly used in batteries?
A) Lithium
B) Silver
C) Lead
D) Copper
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