12 1 experimental techniques

This piece of apparatus is called a gas syringe.

True. A temperature probe is more precise than a thermometer.

This piece of apparatus is called a measuring cylinder.

Advantages of using temperature probes include:

The piece of apparatus which could be used to time the length of a reaction is a stopwatch / stopclock / timer.

The piece of apparatus which could be used to measure the volume of gas produced when marble chips are added to hydrochloric acid is a gas syringe.

False. A measuring cylinder is less accurate than a pipette for measuring a fixed volume of liquid.

The volume on the burette to one decimal place is 17.8 cm3.

The piece of apparatus which could be used to measure out 0.5 g of magnesium powder is a balance.

The standard unit of mass in chemistry is grams.

False. The solvent in a mixture of salt and water is the water.

True. The filtrate is a liquid or solution that passes through a filter.

A solute is the substance which dissolves in a liquid to form a solution.

A solvent is the substance that dissolves a solute.

A solution is a mixture of one or more solutes dissolved in a solvent.

A saturated solution is a solution containing the maximum concentration of a solute dissolved in the solvent at a specified temperature.

The word is used to describe the substance that remains in the funnel is the residue.

True. Residue refers to a substance that remains after separation process.

In a solution of salt water, the salt is the solute and the water is the solvent.

A filtrate is a liquid / solution that has passed through a filter.

An acid-base titration is a method used to determine the concentration of an unknown acid or alkali.

Concordant results are results that are within 0.1 cm3 of each other.

The indicator is used to identify the endpoint of the titration by changing colour sharply when the reaction is complete.

False. The funnel should be removed from the burette before starting the titration, as it can drip liquid into the burette, making the initial reading false.

This piece of apparatus is a pipette.

Repeating a titration and achieving concordant results increases the accuracy of the measurement.

The endpoint is when an indicator changes colour sharply during a titration, signalling the completion of the reaction.

Swirling the flask during a titration ensures thorough mixing of the solutions and helps to identify the endpoint more accurately.

The piece of equipment used to transfer a fixed volume of acid / alkali into a conical flask for a titration is a volumetric pipette.

A white tile placed underneath the conical flask during a titration because it allows the colour change to be observed more easily.

The piece of apparatus that measures a variable volume of acid / alkali during a titration is a burette.

This piece of apparatus is called a burette.