12.1 Experimental Design (Cambridge (CIE) O Level Chemistry): Flashcards
Exam code: 5070
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What is a volumetric pipette used for?
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What is a volumetric pipette used for?
A volumetric pipette is used to accurately measure a fixed volume of liquid, typically 10 cm3 or 25 cm3.
A burette measures volumes from 0 cm3 to 50 cm3, with the 0 cm3 mark at the ______ of the scale.
A burette measures volumes from 0 cm3 to 50 cm3, with the 0 cm3 mark at the top of the scale.
What apparatus is used to collect a gas that is not water-soluble?
To collect a gas that is not water-soluble, a gas syringe can be used, or alternatively a graduated measuring cylinder inverted over water.
A ______ cylinder gives an approximate volume of liquid, while a volumetric ______ gives an accurate fixed volume.
A measuring cylinder gives an approximate volume of liquid, while a volumetric pipette gives an accurate fixed volume.
True or False?
A digital balance must be tared (set to zero) before use.
True.
Taring the balance ensures that only the mass of the sample is recorded and not the mass of any container.
Temperature is measured in degrees ______ and can be recorded using a thermometer or a digital temperature ______.
Temperature is measured in degrees Celsius and can be recorded using a thermometer or a digital temperature probe.
State one advantage of a digital temperature probe over a traditional thermometer.
A digital temperature probe is more precise than a traditional thermometer, reading to 0.1°C compared with 0.5°C or 1°C for a typical laboratory thermometer.
A digital temperature probe allows continuous/automatic recording.
Define a solution.
A solution is a mixture of one or more solutes dissolved in a solvent.
A ______ is a substance that dissolves a solute, while a ______ is a substance that is dissolved in a solvent.
A solvent is a substance that dissolves a solute, while a solute is a substance that is dissolved in a solvent.
What is a filtrate?
A filtrate is the liquid or solution that has passed through a filter during filtration.
A saturated solution is one that contains the maximum ______ of a solute dissolved in the solvent at a specified ______.
A saturated solution is one that contains the maximum concentration of a solute dissolved in the solvent at a specified temperature.
True or False?
A solvent is a substance that is dissolved in another substance to form a solution.
False.
A solvent is a substance that dissolves a solute. The substance that is dissolved in the solvent is called the solute.
The ______ that remains after filtration, evaporation, or distillation is called the ______, while the liquid that passes through the filter paper is called the ______.
The substance that remains after filtration, evaporation, or distillation is called the residue, while the liquid that passes through the filter paper is called the filtrate.
How does a saturated solution differ from a concentrated solution?
A saturated solution contains the maximum possible amount of dissolved solute at a given temperature and cannot dissolve more, whereas a concentrated solution simply contains a large amount of dissolved solute but may not be at its maximum.
An ______ solution is one in which the solvent is water, while a ______ solution contains the maximum amount of dissolved solute at a given temperature.
An aqueous solution is one in which the solvent is water, while a saturated solution contains the maximum amount of dissolved solute at a given temperature.
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