21. Which piece of equipment is commonly used to heat liquids in a laboratory setting?

a) Bunsen burner
b) Beaker
c) Pipette
d) Separating funnel
Answer: a) Bunsen burner

22. The process of separating components of a mixture based on their different solubilities in a solvent is called:

a) Filtration
b) Distillation
c) Liquid-liquid extraction
d) Chromatography
Answer: c) Liquid-liquid extraction

23. The accuracy of a measurement refers to how close the measurement is to:

a) The average of multiple measurements
b) The true or accepted value
c) The measurement’s standard deviation
d) The range of measurements
Answer: b) The true or accepted value

24. The device used to measure the volume of a liquid very precisely is a:

a) Beaker
b) Graduated cylinder
c) Erlenmeyer flask
d) Test tube
Answer: b) Graduated cylinder

25. When separating components of a mixture using a separating funnel, what is the key factor that determines separation?

a) Temperature
b) Density
c) Color
d) Size
Answer: b) Density

26. What is the main purpose of using a condenser in distillation?

a) To heat the mixture
b) To cool and condense the vapor
c) To filter out solids
d) To mix liquids
Answer: b) To cool and condense the vapor

27. The process of removing a solvent from a solution by boiling it and then condensing the vapor is known as:

a) Filtration
b) Chromatography
c) Distillation
d) Sublimation
Answer: c) Distillation

28. A reagent used to test for the presence of starch in a solution is:

a) Benedict’s solution
b) Silver nitrate
c) Iodine solution
d) Phenolphthalein
Answer: c) Iodine solution

29. The purpose of a desiccator is to:

a) Control the temperature of a reaction
b) Protect samples from moisture
c) Measure precise volumes of liquids
d) Separate components based on solubility
Answer: b) Protect samples from moisture

30. Which technique is used to separate a mixture based on the difference in the size of particles?

a) Centrifugation
b) Filtration
c) Chromatography
d) Distillation
Answer: b) Filtration