Chemistry A-Level Techniques and Procedures - Statistics

Jump to: Answer Stats | Score Distribution | Your Scores

General Stats

This quiz has been taken 3 times
The average score is 16 of 217

Answer Stats

Hint	Answer	% Correct
2. pipette 25cm^3 alkaline solution into a ____ ____	conical flask	67%
1. ____ the balance	zero	67%
6. record the start reading to the nearest ____ cm^3	0.05	33%
7. carry out the titration and record the end reading to the nearest ____ cm^3	0.05	33%
1. rinse and fill the burette with ____	acid	33%
ensure the oven's temperature is ____ the melting point of the salt	below	33%
3. use a ____ to add the correct amount of acid to neutralise the alkali	burette	33%
2. close the ____ ____	burette tap	33%
5. plot a ____ ____ of concentration against absorbance	calibration curve	33%
4. use a ____ to hold your burette in place	clamp	33%
therefore, we can use iodine-thiosulfate titration to find the ____ of a solution of chlorate (I)	concentration	33%
7. repeat until you have three ____ results within 0.10cm^3 of each other and use the mean	concordant	33%
3. vertically attach a ____ so the water flows in at the bottom and out at the top	condenser	33%
2. transfer 25cm^3 alkaline solution to a clean ____ ____	conical flask	33%
3. leave to ____	cool	33%
5. heat over a Bunsen burner to evaporate the water until ____ start to appear	crystals	33%
1. rinse pipette with ____ ____ and then a small volume of the solution to be pipetted	distilled water	33%
1. rinse burette with ____ ____ and then a small volume of the solution to be used	distilled water	33%
6. filter the mixture and wash the residue with cold ____ ____	distilled water	33%
5. allow the plate to ____	dry	33%
3. cover with a watch glass to prevent ____	evaporation	33%
keep the cap on to reduce fuel loss by ____	evaporation	33%
3. pour the solution into the burette using a ____. fill to above the zero line	funnel	33%
5. stir the mixture with a ____ ____ to ensure the solute has completely dissolved	glass rod	33%
4. empty the solid into the ____ and accurately reweigh the empty weighing bottle	glassware	33%
4. run the liquid from the pipette to the ____	glassware	33%
3. add 2-3 drops of ____ and swirl to mix	indicator	33%
swirl after each drop until the colour of the ____ just changes	indicator	33%
1. put the reactants in a ____ ____ flask	pear-shaped/round-bottomed	33%
____ is colourless in acidic solutions and pink in basic ones	phenolphthalein	33%
2. using a ____ ____ draw enough liquid into the pipette until it is exactly the right volume	pipette filler	33%
5. match the calculated ____ values with those in a database	Rf	33%
5. the first titration is the ____ titration to indicate roughly how much acid is required	rough	33%
8. the oven's temperature should be below the melting point of the ____	salt	33%
3. accurately record the mass of the ____ plus the weighing bottle	solid	33%
3. transfer the weighed ____ into the water	solute	33%
2. suspend the plate in a baker containing the ____	solvent	33%
3. check the bulb of the electrode is completely immersed, then wait for the reading to ____	stabilise	33%
1. rinse a clean dry beaker with the ____ ____ then half-fill it	stock solution	33%
5. ____ mass of empty weighing bottle from mass of solid + weighing bottle	subtract	33%
4. run the acid, ____ the flask, until the solution just changes colour	swirling	33%
2. use a thermometer to take the initial ____	temperature	33%
8. find the ____ by subtracting the initial reading from the final reading	titre	33%
7. transfer the residue to a ____ ____ and heat in an oven to dry the solid	watch glass	33%
2. place a ____ ____ on the balance	weighing bottle	33%
1. calculate the mass of solute required and weigh out in a ____ ____	weighing bottle	33%
5. put the conical flask on a ____ ____ to make the end point easier to see	white tile	33%
a pure substance melts within ____K of the true melting point	0.5	0%
8. add deionised water, swirling at intervals to mix the contents, until the level is within about ____ cm^3 of the mark on the flask's neck	1	0%
calibrate to pH ___ for alkaline solutions	10.00	0%
6. carry on heating until the temperature has risen by about ____ to ____ K	15 20/1520/fifteentwenty/fifteen twenty	0%
3. when the vapour temperature is about ____ degrees below the boiling point of the liquid, put the collecting beaker in place	2/two	0%
calibrate to pH ___ for acidic solutions	4.00	0%
4. collect the liquid until the temperature of the vapour rises ____ the boiling point of the liquid you are collecting	above	0%
this allows for the greatest values of ____	absorbance	0%
4. measure the ____ of each of the standard solutions	absorbance	0%
a measure of the closeness of agreement between an individual test result and the accepted reference value	accuracy	0%
1. carry out an ____ ____ ____ to find how much acid solution is needed to neutralise 25cm^3 alkaline solution	acid base titration	0%
5. open the tap and allow the solution to run into a beaker until there are no ____ ____	air bubbles	0%
1. pour some chlorate (I) solution into a clean, dry beaker and transfer a 25cm^3 ____ into a conical flask	aliquot	0%
5. dry the crude product by adding ____ ____ ____ and swirling	anhydrous sodium sulfate	0%
the ____ will need to be made of the impure metal	anode	0%
2. add ____ ____ ____ (stop large bubbles forming suddenly and allow for a smooth boiling process)	anti bumping granules	0%
1. put the mixture in a pear-shaped flask and add ____ ____ ____	anti bumping granules	0%
the contents of the flask will turn ____ ____ due to iodine being present	blue-black	0%
you will know it's the right volume when the ____ __ __ ____ is level with the mark	bottom of the meniscus	0%
9. use a dropping pipette to add deionised water so the ____ __ __ ____ is level with the mark on the neck of the flask at eye level	bottom of the meniscus	0%
9. test any liquid product with ____ ____. it should remain orange/brown	bromine water	0%
add a few drops of ____ ____	bromine water	0%
at this stage, the contents will be ____ due to iodine being produced	brown	0%
2. dampen a piece of filter paper and place flat in the ____ ____	Buchner funnel	0%
to measure both acidic and alkaline solutions with a wide range of values, calibrate with acidic, alkaline and neutral ____	buffers	0%
2. transfer into a ____ ____ of pH 7.00	buffer solution	0%
you need to ___ the pH electrode for temperature because pH is dependent on temperature	calibrate	0%
1. pour a known volume of water into a copper ____ and record its temperature	calorimeter	0%
1. seal the end of a glass ____ ____ by heating it to melting in a Bunsen flame	capillary tube	0%
2. strongly heat the ____	catalyst	0%
the ____ should be made of the pure metal	cathode	0%
____ ions are strong enough oxidising agents to oxidise iodide ions to iodine	chlorate	0%
5. rinse the crystals with ____ ____	cold solvent	0%
1. set up apparatus, place several test tubes of water in the ____ ____	collection trough	0%
similar to a ____ in that a light source is passed through a sample and absorbance or transmission is measured	colorimeter	0%
for a coloured solution, it can be determined by ____	colorimetry	0%
7. the end point is where the solution is ____	colourless	0%
if an alkene is present, the bromine water will change from orange/brown to ____	colourless	0%
1. select the filter with the ____ colour to the test solution	complementary	0%
the second stage is determining ____ of one of the ions in solution	concentration	0%
2. determine ____ of one of the components in the equilibrium mixture	concentration	0%
10. heat until the solid has dried to a ____ ____	constant mass	0%
8. leave to ____, then dismantle	cool	0%
this ensures that when the hydrocarbon vapour passes over it, the temperature is high enough for any ____ reactions to take place	cracking	0%
5. follow the procedure for ____ (given above)	crystallisation	0%
3. zero the colorimeter using a ____ of pure solvent	cuvette	0%
10. test the gas by shaking with bromine water. it should ____	decolorise	0%
2. filter and wash the precipitate several times with cold, ____ ____	deionised water	0%
2. pour 100cm^3 ____ ____ into a 250cm^3 beaker	deionised water	0%
1. wash the electrode with ____ ____	deionised water	0%
2. the ____ ____ delivers gas to the burette	delivery tube	0%
7. remove the ____ ____ from the collection trough before stopping heating to prevent suck back	delivery tube	0%
9. at regular intervals, remove the watch glass and solid, cool in a ____ and weigh	dessicator	0%
11. leave to cool in a ____ (these allow materials to cool in a dry atmosphere so prevent reabsorption of moisture)	dessicator	0%
4. heat to constant mass and then leave to cool in a ____	dessicator	0%
when you use a ____ measuring device, you should record all the figures shown on the instrument	digital	0%
4. if the crude product is alkaline and needs neutralising, add a ____ ____ until it's neutral	dilute acid	0%
if so, do this by filling test tubes with water as these will ____ the water	displace	0%
5. discard the first tube of gas because this will just be ____ air	displaced	0%
6. the pure product can then be separated by ____	distillation	0%
4. surround with a ____ ____ to help reduce energy losses	draught excluder	0%
6. titrate again. run the acid solution to 1cm^3 below the rough titre then add acid ____	dropwise	0%
3. ____ the outside of the pipette	dry	0%
3. transfer the precipitate to a clean watch glass and place in a ____ ____	drying oven	0%
6. dry the crystals in a ____ ____	drying oven	0%
for a metal ion/metal half cell, the ____ will be made from the solid metal	electrode	0%
4. take the voltmeter reading to find ____ ____ (or standard ____ ____ in this case	electrode potential	0%
1. pass an electric current through the ____	electrolyte	0%
9. weigh the burner again. you can use this to determine ____ ____ __ ____	enthalpy change of combustion	0%
6. calculate the maximum temperature reached and use this to determine ____ ____ __ ____	enthalpy change of neutralisation	0%
1. allow a mixture to reach ____	equilibrium	0%
the difference between an individual measurement and the true value or accepted reference value of the quantity being measured	error	0%
when using a non-digital device, you should record all the figures that are certain plus one that is ____	estimated	0%
4. transfer the neutralised solution to a clean ____ ____	evaporating basin	0%
1. in a beaker, warm ____ insoluble base in dilute acid	excess	0%
2. add a known mass of solid reactant in ____	excess	0%
6. compare the ____ value to the published value	experimental	0%
7. ____ the spirit burner and replace the cap	extinguish	0%
5. plot a graph of temperature against time and ____ to find the theoretical maximum temperature change	extrapolate	0%
4. filter off excess solid base and transfer the ____ to a clean, dry evaporating basin	filtrate	0%
3. support the calorimeter over a spirit burner containing the ____ to be tested	fuel	0%
4. record changes in temperature every 30 seconds until there is no ____ ____	further change	0%
4. the ____ will enter the burette and you can take a reading	gas	0%
6. continue heating until no more ____ is produced	gas	0%
you may need to collect ____ products	gaseous	0%
the system must be ____ ____	gas tight	0%
uncertainty is usually taken to be ____ a division on either side of the smallest scale on the scale you're using	half	0%
1. construct the ____ ____ whose electrode potential is to be measured	half cell	0%
5. vapours should reach no more than ____ up the column before condensing back into a liquid	halfway	0%
4. heat with a ____ ____ so the reaction mixture boils gently	heating mantle	0%
8. keep stirring the water. make a note of the ____ temperature reached	highest	0%
3. connect the two electrodes to a ____ ____ ____	high resistance voltmeter	0%
3. heat the ____ gently, collecting any gases that pass into the collection tubes	hydrocarbon	0%
for a basic solution, concentration can be determined using acid-base titration with the ____ ions	hydroxide	0%
1. mix the organic product with another ____ liquid such as water	immiscible	0%
the wider the melting range, the more ____ the substance	impure	0%
5. touch the tip of the pipette to the ____ of the glassware	inside	0%
3. filter to remove any ____ ____ and retain the filtrate	insoluble impurities	0%
1. use a measuring cylinder to add a known volume of a known concentration of acid to an ____ ____	insulated vessel	0%
1. add a known volume of a known concentration of reactant solution to an ____ ____	insulated vessel	0%
10. insert a stopper in the flask and ____ it several times to ensure thorough mixing	invert	0%
1. use an ____ ____ to collect the gas over water	inverted burette	0%
2. add excess iodide ions, using a measuring cylinder to transfer e.g. 15cm^3 of 0.5 mol dm^3 potassium ____ to the conical flask	iodide	0%
____ is used to detect colourless organic compounds	iodine	0%
the electrolyte must contain ____ of that metal	ions	0%
3. use this to work out the other concentrations and calculate ____ using the equation	Kc	0%
4. top the vessel with a ____ with a hole in and place the thermometer through the hole in the ____	lid	0%
3. top the vessel with a ____ with a hole in	lid	0%
you can repeat this for multiple ____ in a mixture if necessary	liquids/substances	0%
percentage uncertainty = uncertainty x number of measurements x 100 divided by ____ ____	measured quantity	0%
3. use a ____ ____ to add a known volume of a known concentration of alkali and stir to mix	measuring cylinder/volumetric pipette	0%
5. note the temperature at which the solid starts and finishes melting - the difference is the ____ ____	melting range	0%
ensure the ____ reads 7.00 and adjust to that value if necessary	meter	0%
2. dissolve the mixture in the ____ quantity of hot solvent	minimum	0%
in that case, the solution will contain a ____ of the two ions	mixture	0%
if the reading is ____ switch the connections on the voltmeter	negative	0%
2. warm until the solution is ____, adding more solid base if needed	neutral	0%
____ is used to detect compounds with free amino groups such as proteins, amino acids, and amines	ninhydrin	0%
2. tap the ____ end of the tube into a solid so a small amount goes into the tube	open/unsealed	0%
6. carry out titrations. near the end point, the contents of the flask will be a ____ ____ colour	pale straw	0%
if the reaction involves two ions of the same element in different oxidation states, the electron should be ____	platinum	0%
ensure the reading on the voltmeter is ____	positive	0%
this ensures that the half-cell connected to the ____ ____ of the voltmeter is the positive electrode	positive terminal	0%
1. add in equal volumes of the desired salt solutions in a beaker to form a ____ of the insoluble salt	precipitate	0%
the closeness of agreement between independent measurements made under the same conditions	precision	0%
just one is sufficient because the concentration of one ion is ____ to the other	proportional	0%
if electrolysis to be carried out to ____ a metal:	purify	0%
1. spot the test mixture and ____ ____ on a pencil baseline 1cm from the base of the TLC plate	reference samples	0%
the opposite of uncertainty (if uncertainty is great, the measurement is unreliable)	reliability	0%
4. filter and discard the ____	residue	0%
4. ____ the weighing bottle to calculate actual mass in the beaker	reweigh	0%
3. leave the mixture to cool to ____ ____	room temperature	0%
first, prepare a ____ ____ in deionised water	saturated salt	0%
3. tap the tube so the solid falls to the bottom of the ____ end	sealed	0%
2. allow the layers to separate and dispose of the aqueous layer using a ____ ____	separating funnel	0%
1. warm deionised water in a small conical flask and add the salt, ____ frequntly	shaking	0%
1. connect a conical flask to a vacuum pump via the ____ ____	side arm	0%
3. if acid impurities are present, add ____ ____ ____ solution and shake well to remove them	sodium hydrogen carbonate	0%
4. fill burette with a standard solution of 0.1mol dm^3 ____ ____	sodium thiosulfate	0%
2. keep adding ____ until no more dissolves	solute	0%
4. remove the plate when the solvent is near the top and mark the ____ ____ with a pencil	solvent front	0%
2. weigh a ____ ____	spirit burner	0%
in all cases, ensure ____ ____	standard conditions	0%
2. connect the half-cell to a ____ ____ ____ ____	standard hydrogen half cell	0%
2. make up a range of ____ ____ of the test solution, both above and below the concentration of the unknown solution	standard solutions	0%
at this point, add a few drops of ____ solution	starch	0%
4. fix the tube in melting point apparatus and gently heat the surrounding liquid, ____ to ensure even heating	stirring	0%
5. disconnect the flask from the vacuum pump before turning the pump off to prevent ____ ____	suck back	0%
4. change and cork any full tubes to prevent ____ ____ and continue to heat	suck back	0%
3. add excess hydrogen ions by adding 20cm^3 of 1 mol dm^3 ____ ____	sulfuric acid	0%
5. record changes in ____ every 30 seconds until there is no further change	temperature	0%
Ksp is ____ dependent, so take the ____ of the solutions you're working with	temperature	0%
1. select a solvent in which the desired substance is very soluble at high ____ and insoluble at low ____	temperatures	0%
3. make up to the mark with the usual procedure. you will have diluted your solution by a factor of ____ here	ten	0%
6. locate spots. you may need to add a stain or view under ____ ____	ultraviolet light	0%
the TLC plate fluoresces under ____ ____. compounds with aromatic rings or conjugated structures appear as dark spots	ultraviolet light	0%
an estimate attached to a measurement which characterises the range of values within which the true value is asserted to lie	uncertainty	0%
6. measure the absorbance of the ____ sample and use the calibration curve to determine its concentration	unknown	0%
4. this creates a partial ____ so the filtrate is quickly pulled through	vacuum	0%
for this step, use a ____ ____ to retain heat	vacuum filtration	0%
4. leave the filtrate to cool until crystals form and collect the crystals by ____ ____	vacuum filtration	0%
3. switch the ____ ____ on then pour in the mixture to be filtered	vacuum pump	0%
2. the thermometer should read the temperature of the ____	vapour	0%
a visible spectrophotomer can give data for absorption or transmission for any given value of the ____ ____	visible spectrum	0%
6. transfer the solution to a clean 250cm^3 ____ ____	volumetric flask	0%
2. use a pipette filler to pipette 25cm^3 of the stock solution into a 250cm^3 ____ ____	volumetric flask	0%
7. rinse the beaker and stirring rod with deionised water, ensuring all ____ go into the flask	washings	0%
3. the burette is inverted in a ____ ____ and itself filled with water initially	water trough	0%
in the case of a colorimeter, the coloured light used as a source can only be selected from a specific number of different ____	wavelengths	0%
5. remove the cap of the spirit burner and light the ____	wick	0%

Score Distribution

Percent of People with Each Score

Percentile by Number Answered

Your Score History

You have not taken this quiz

Countries of the World Quiz

US States Quiz

Biggest Countries by Population

100 Most Common English Words

Flags of Europe Quiz

NBA MVPs Quiz

Fast Math - Multiplication

Planets of the Solar System Quiz

Biggest Countries by Area

All Major North American Pro Sports Teams

Biggest Cities in the United States

Random Country to Capital