EBSU-CHEM 191 Past Questions and Answers

Title: EBSU-CHEM 191 Past Questions and Answers
URL: https://studentsdash.com/ebsu-chem-191-past-questions-and-answers/
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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
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
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
Identify the part of the microscope labeled “A.”
a) Ocular lens
b) Objective lens
c) Stage
d) Base
Answer:
b) Objective lens
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
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
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
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
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
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
Which laboratory equipment is used to measure mass?
a) Graduated cylinder
b) Bunsen burner
c) Balance
d) Thermometer
Answer:
c) Balance
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
Identify the type of reaction: A + B → C + D.
a) Decomposition
b) Synthesis
c) Double displacement
d) Single displacement
Answer:
b) Synthesis
What is the pH of a neutral solution?
a) 0
b) 7
c) 14
d) 10
Answer:
b) 7
Which method is used to separate a solid from a liquid?
a) Filtration
b) Distillation
c) Evaporation
d) Chromatography
Answer:
a) Filtration
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
What is the term for the amount of substance in a given volume?
a) Concentration
b) Molarity
c) Density
d) Mass
Answer:
a) Concentration
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
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
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
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
What is the process of converting a liquid to a gas called?
a) Evaporation
b) Condensation
c) Sublimation
d) Freezing
Answer:
a) Evaporation
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
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
Identify the type of reaction where two compounds exchange ions.
a) Synthesis
b) Decomposition
c) Single displacement
d) Double displacement
Answer:
d) Double displacement
What is the term for a homogeneous mixture of two or more substances?
a) Solution
b) Suspension
c) Colloid
d) Alloy
Answer:
a) Solution
Which of the following indicates a physical change?
a) Burning wood
b) Rusting iron
c) Melting ice
d) Digesting food
Answer:
c) Melting ice
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
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
What is the chemical formula for water?
a) H2O
b) CO2
c) O2
d) CH4
Answer:
a) H2O
Identify the process where a solid changes directly to a gas.
a) Sublimation
b) Evaporation
c) Melting
d) Condensation
Answer:
a) Sublimation
Which type of reaction absorbs heat?
a) Exothermic
b) Endothermic
c) Combustion
d) Decomposition
Answer:
b) Endothermic
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
Identify the method used to separate a soluble solid from a liquid.
a) Filtration
b) Distillation
c) Evaporation
d) Chromatography
Answer:
c) Evaporation
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
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
Which piece of equipment is used for precise measurements of mass?
a) Balance
b) Graduated cylinder
c) Pipette
d) Beaker
**
Answer:** a) Balance
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
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
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
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
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
Identify the type of reaction that produces heat and light.
a) Combustion
b) Synthesis
c) Decomposition
d) Neutralization
Answer:
a) Combustion
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
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
Which laboratory process is used to purify a liquid by boiling and condensing?
a) Filtration
b) Distillation
c) Chromatography
d) Evaporation
Answer:
b) Distillation
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
What type of change occurs when ice melts?
a) Chemical change
b) Physical change
c) Nuclear change
d) Thermal change
Answer:
b) Physical change
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
What is the process called when a gas turns into a liquid?
a) Evaporation
b) Condensation
c) Freezing
d) Sublimation
Answer:
b) Condensation