EBSU-CHEM 191 Past Questions and Answers

Share With Friends
  1. What is the purpose of a Bunsen burner in the laboratory?
    a) To heat substances
    b) To measure volume
    c) To mix solutions
    d) To cool samples
    Answer: a) To heat substances
  2. Which piece of equipment is used to accurately measure liquid volumes?
    a) Beaker
    b) Graduated cylinder
    c) Test tube
    d) Erlenmeyer flask
    Answer: b) Graduated cylinder
  3. What is the correct way to mix an acid with water?
    a) Add water to acid
    b) Add acid to water
    c) Mix equal parts of both
    d) They should never be mixed
    Answer: b) Add acid to water
  4. Identify the part of the microscope labeled “A.”
    a) Ocular lens
    b) Objective lens
    c) Stage
    d) Base
    Answer: b) Objective lens
  5. What is the role of a fume hood in the laboratory?
    a) To store chemicals
    b) To protect against harmful vapors
    c) To mix solutions
    d) To heat samples
    Answer: b) To protect against harmful vapors
  6. What is the main safety equipment required when handling chemicals?
    a) Gloves
    b) Goggles
    c) Lab coat
    d) All of the above
    Answer: d) All of the above
  7. Which piece of equipment is used to heat liquids in a laboratory?
    a) Test tube
    b) Hot plate
    c) Beaker
    d) Pipette
    Answer: b) Hot plate
  8. What is the term for a substance that speeds up a chemical reaction without being consumed?
    a) Catalyst
    b) Reactant
    c) Solvent
    d) Product
    Answer: a) Catalyst
  9. Which of the following indicates a chemical change?
    a) Melting ice
    b) Dissolving sugar in water
    c) Rust forming on iron
    d) Boiling water
    Answer: c) Rust forming on iron
  10. What is the purpose of a control in an experiment?
    a) To test the hypothesis
    b) To provide a comparison
    c) To eliminate variables
    d) To ensure accuracy
    Answer: b) To provide a comparison
  11. Which laboratory equipment is used to measure mass?
    a) Graduated cylinder
    b) Bunsen burner
    c) Balance
    d) Thermometer
    Answer: c) Balance
  12. What is the primary purpose of a titration?
    a) To heat solutions
    b) To determine concentration
    c) To mix reagents
    d) To separate mixtures
    Answer: b) To determine concentration
  13. Identify the type of reaction: A + B → C + D.
    a) Decomposition
    b) Synthesis
    c) Double displacement
    d) Single displacement
    Answer: b) Synthesis
  14. What is the pH of a neutral solution?
    a) 0
    b) 7
    c) 14
    d) 10
    Answer: b) 7
  15. Which method is used to separate a solid from a liquid?
    a) Filtration
    b) Distillation
    c) Evaporation
    d) Chromatography
    Answer: a) Filtration
  16. What type of bond is formed by the sharing of electrons?
    a) Ionic bond
    b) Covalent bond
    c) Metallic bond
    d) Hydrogen bond
    Answer: b) Covalent bond
  17. What is the term for the amount of substance in a given volume?
    a) Concentration
    b) Molarity
    c) Density
    d) Mass
    Answer: a) Concentration
  18. Which piece of equipment is used for heating small samples in a laboratory?
    a) Beaker
    b) Test tube
    c) Petri dish
    d) Erlenmeyer flask
    Answer: b) Test tube
  19. What is the effect of increasing temperature on reaction rates?
    a) Decreases reaction rates
    b) No effect
    c) Increases reaction rates
    d) Makes reactions reversible
    Answer: c) Increases reaction rates
  20. What does the term “molar mass” refer to?
    a) The mass of one mole of a substance
    b) The volume of a mole of gas
    c) The density of a substance
    d) The number of atoms in a molecule
    Answer: a) The mass of one mole of a substance
  21. What is the primary function of an incubator in a laboratory?
    a) To store chemicals
    b) To provide a controlled environment
    c) To mix solutions
    d) To heat samples
    Answer: b) To provide a controlled environment
  22. What is the process of converting a liquid to a gas called?
    a) Evaporation
    b) Condensation
    c) Sublimation
    d) Freezing
    Answer: a) Evaporation
  23. Which piece of lab equipment is used to contain reactions and has a narrow neck?
    a) Beaker
    b) Erlenmeyer flask
    c) Petri dish
    d) Graduated cylinder
    Answer: b) Erlenmeyer flask
  24. What is the primary purpose of chromatography?
    a) To measure pH
    b) To separate mixtures
    c) To heat samples
    d) To mix solutions
    Answer: b) To separate mixtures
  25. Identify the type of reaction where two compounds exchange ions.
    a) Synthesis
    b) Decomposition
    c) Single displacement
    d) Double displacement
    Answer: d) Double displacement
  26. What is the term for a homogeneous mixture of two or more substances?
    a) Solution
    b) Suspension
    c) Colloid
    d) Alloy
    Answer: a) Solution
  27. Which of the following indicates a physical change?
    a) Burning wood
    b) Rusting iron
    c) Melting ice
    d) Digesting food
    Answer: c) Melting ice
  28. What safety equipment should be worn when working with hazardous chemicals?
    a) Gloves
    b) Safety goggles
    c) Lab coat
    d) All of the above
    Answer: d) All of the above
  29. What is the primary purpose of a reflux condenser?
    a) To cool vapors
    b) To heat solutions
    c) To mix chemicals
    d) To separate components
    Answer: a) To cool vapors
  30. What is the chemical formula for water?
    a) H2O
    b) CO2
    c) O2
    d) CH4
    Answer: a) H2O
  31. Identify the process where a solid changes directly to a gas.
    a) Sublimation
    b) Evaporation
    c) Melting
    d) Condensation
    Answer: a) Sublimation
  32. Which type of reaction absorbs heat?
    a) Exothermic
    b) Endothermic
    c) Combustion
    d) Decomposition
    Answer: b) Endothermic
  33. What is the purpose of a spectrophotometer in the lab?
    a) To measure temperature
    b) To analyze light absorption
    c) To mix solutions
    d) To measure pressure
    Answer: b) To analyze light absorption
  34. Identify the method used to separate a soluble solid from a liquid.
    a) Filtration
    b) Distillation
    c) Evaporation
    d) Chromatography
    Answer: c) Evaporation
  35. What is the primary role of a buffer solution?
    a) To change pH rapidly
    b) To resist changes in pH
    c) To act as a solvent
    d) To provide nutrients
    Answer: b) To resist changes in pH
  36. What is the result of mixing an acid with a base?
    a) A chemical change
    b) A physical change
    c) No reaction
    d) Only a color change
    Answer: a) A chemical change
  37. Which piece of equipment is used for precise measurements of mass?
    a) Balance
    b) Graduated cylinder
    c) Pipette
    d) Beaker
    **

Answer:** a) Balance

  1. What is the term for the temperature at which a liquid becomes a gas?
    a) Freezing point
    b) Melting point
    c) Boiling point
    d) Condensation point
    Answer: c) Boiling point
  2. What type of glassware is used for boiling and mixing liquids?
    a) Beaker
    b) Test tube
    c) Petri dish
    d) Graduated cylinder
    Answer: a) Beaker
  3. What is the function of a thermometer in the laboratory?
    a) To measure pH
    b) To measure temperature
    c) To measure volume
    d) To measure mass
    Answer: b) To measure temperature
  4. Which type of chemical bond involves the transfer of electrons?
    a) Ionic bond
    b) Covalent bond
    c) Metallic bond
    d) Hydrogen bond
    Answer: a) Ionic bond
  5. What is the term for a solution that has more solute than it can dissolve at a given temperature?
    a) Unsaturated
    b) Saturated
    c) Supersaturated
    d) Diluted
    Answer: c) Supersaturated
  6. Identify the type of reaction that produces heat and light.
    a) Combustion
    b) Synthesis
    c) Decomposition
    d) Neutralization
    Answer: a) Combustion
  7. What is the main purpose of a laboratory notebook?
    a) To store samples
    b) To record experiments and results
    c) To measure volumes
    d) To organize supplies
    Answer: b) To record experiments and results
  8. What does the term “solute” refer to in a solution?
    a) The liquid part
    b) The solid part
    c) The substance being dissolved
    d) The total amount of substance
    Answer: c) The substance being dissolved
  9. Which laboratory process is used to purify a liquid by boiling and condensing?
    a) Filtration
    b) Distillation
    c) Chromatography
    d) Evaporation
    Answer: b) Distillation
  10. What is the purpose of a drying agent?
    a) To cool substances
    b) To absorb moisture
    c) To speed up reactions
    d) To mix solutions
    Answer: b) To absorb moisture
  11. What type of change occurs when ice melts?
    a) Chemical change
    b) Physical change
    c) Nuclear change
    d) Thermal change
    Answer: b) Physical change
  12. What is the primary purpose of a safety shower in a lab?
    a) To wash hands
    b) To cool samples
    c) To rinse off chemicals
    d) To measure water
    Answer: c) To rinse off chemicals
  13. What is the process called when a gas turns into a liquid?
    a) Evaporation
    b) Condensation
    c) Freezing
    d) Sublimation
    Answer: b) Condensation

Leave a Reply

Your email address will not be published. Required fields are marked *

error: Emmy is Sorry Bruh !!