Home / … / G3 Science (Chemistry) / Experimental Chemistry / G3 Science (Chemistry) Experimental Chemistry · question set Exit to Experimental Chemistry G3 Science (Chemistry) Experimental Chemistry · question set Try K326/K328 Experimental Chemistry exam-style questions. Measurement, apparatus, gas collection, separation, chromatography and purity at G3 Science depth. K324 planning, titration and Rf calculations are excluded.
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A measuring cylinder contains water with a concave meniscus. How should you read its volume?
Read the top of the meniscus at eye level Read the bottom of the meniscus at eye level Read the bottom of the meniscus from above Read the top of the meniscus from below Which is the best method to avoid parallax error when reading a measuring cylinder?
Hold it above your head Read at eye level with the meniscus Tilt the cylinder towards you Read the top of the meniscus for water A student measures 10.0 cm³ of solution using a 10 cm³ measuring cylinder. What is a better apparatus choice for higher accuracy?
Beaker Dropping pipette Volumetric pipette Boiling tube A gas is insoluble (or only slightly soluble) in water. Which collection method is usually suitable?
Displacement of water Upward delivery Downward delivery Always use a gas syringe only Which gas is most suitable to collect by upward delivery (displacement of air)?
Carbon dioxide ($\ce{CO2}$) Ammonia ($\ce{NH3}$) Chlorine ($\ce{Cl2}$) Sulfur dioxide ($\ce{SO2}$) Which gas is most suitable to collect by downward delivery (displacement of air)?
Hydrogen ($\ce{H2}$) Oxygen ($\ce{O2}$) Carbon dioxide ($\ce{CO2}$) Helium ($\ce{He}$) Which method is most suitable for separating a mixture of sand and water?
Distillation Filtration Crystallisation Chromatography In paper chromatography, why must the start line be drawn in pencil?
Pencil lead is cheaper Pencil lead is insoluble in the solvent Pencil marks are easier to erase Ink would react with the paper Which process is used to obtain pure water from seawater by boiling and condensing the solvent?
Fractional Distillation Simple Distillation Evaporation Filtration Which statement describes a pure solid?
It melts over a range of temperatures It melts at one fixed temperature (sharp melting point) It always melts at a higher temperature than an impure solid Its melting point depends only on the mass of the solid A small amount of impurity is mixed into a solid. What is the typical O-Level effect on the melting point?
Melting point increases and becomes sharp Melting point decreases and melting happens over a range Melting point stays the same but boiling point changes Melting point becomes sharp but at a lower temperature An impure sample melts between $117^{\circ}\text{C}$ and $121^{\circ}\text{C}$. Which conclusion is correct?
A pure sample would melt over the same range A pure sample would melt below $117^{\circ}\text{C}$ A pure sample would melt at one fixed temperature above $121^{\circ}\text{C}$ You cannot tell anything about the pure melting point