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The correct classification is Compound."}]},{"id":"eae67a28-6706-43b3-abbe-c12a32827128","cardType":"basic","points":1,"front":"A sample contains $AB$ particles and $A_2$ particles. How is the whole sample classified?","back":"Mixture.","mcqOptions":[{"text":"Mixture.","correct":true,"explanation":"The sample contains two different particle types, AB and A₂. Since more than one substance is present together, the whole sample is classified as a mixture."},{"text":"Element.","correct":false,"explanation":"An element contains only one type of atom, but this sample contains AB and A₂ particles, involving two particle types. The correct classification is Mixture."},{"text":"Compound.","correct":false,"explanation":"A compound is a single substance with particles made from different elements in a fixed ratio. The two particle types here make the sample a Mixture."},{"text":"Pure substance.","correct":false,"explanation":"A pure substance contains only one type of particle. Because both AB and A₂ particles are present, the correct classification is Mixture."}]},{"id":"a468f0ef-5fd4-4bd3-b392-1076c2dd22cc","cardType":"cloze","points":null,"front":"A pure element or pure compound has [ ]; a mixture has [ ].","back":"A pure element or pure compound has one type of particle; a mixture has more than one type of particle.","mcqOptions":[{"text":"A pure element or pure compound has one type of particle; a mixture has more than one type of particle.","correct":true,"explanation":"A pure element or compound contains only one type of particle throughout, whereas a mixture contains at least two different types of particle together."},{"text":"A pure element or pure compound has more than one type of particle; a mixture has one type of particle.","correct":false,"explanation":"A mixture can contain one type of atom in each particle yet still have several particle types overall. The correct distinction is one type versus more than one type of particle."},{"text":"A pure element or pure compound has one type of atom; a mixture has more than one type of atom.","correct":false,"explanation":"Pure substances do not necessarily contain one type of atom, because compounds contain different elements. Purity means one particle type, while mixtures contain more than one."},{"text":"A pure element or pure compound has one type of substance; a mixture has more than one type of substance.","correct":false,"explanation":"Having one substance chemically bonded in each particle does not define a mixture. The key difference is that pure substances have one particle type and mixtures have more than one."}]},{"id":"21272c5b-4c18-4f87-b929-c15f1656e643","cardType":"cloze","points":null,"front":"In chemistry, pure means [ ], not safe or harmless.","back":"In chemistry, pure means only one substance present, not safe or harmless.","mcqOptions":[{"text":"only one substance present","correct":true,"explanation":"In chemistry, pure means that only one substance is present in the sample. It describes composition, not whether the substance is safe, harmless, or suitable to use."},{"text":"safe to use","correct":false,"explanation":"A pure substance can be poisonous or dangerous, so safety is not what pure means in chemistry. The correct meaning is only one substance present."},{"text":"harmless to humans","correct":false,"explanation":"Purity does not mean a substance causes no harm; some pure chemicals are toxic. In this context, pure means only one substance present."},{"text":"found in nature","correct":false,"explanation":"A pure substance need not be naturally occurring, and a natural sample may contain several substances. The correct definition is only one substance present."}]},{"id":"0cf2ea83-e702-4e4e-b370-9e8cb430a11e","cardType":"basic","points":1,"front":"What does a sharp melting point suggest about a substance?","back":"It is likely pure.","mcqOptions":[{"text":"It is likely pure.","correct":true,"explanation":"A pure substance changes state at a fixed temperature, producing a sharp melting point. Impurities usually lower and broaden the melting range."},{"text":"It is likely impure.","correct":false,"explanation":"A mixture usually melts over a range of temperatures because its different components melt differently. A sharp melting point instead suggests the substance is likely pure."},{"text":"It is likely a mixture.","correct":false,"explanation":"A mixture is identified by a melting range rather than normally by one sharp temperature. The sharp result here suggests the substance is likely pure."},{"text":"It is likely a compound.","correct":false,"explanation":"A sharp melting point indicates a fixed composition, but it does not show that the substance consists of different elements. The appropriate conclusion is that it is likely pure."}]},{"id":"f9f6e913-8073-41c6-9cc4-1829beaceea0","cardType":"basic","points":1,"front":"A sample melts over a wide temperature range. What does this suggest?","back":"It is likely a mixture or impure.","mcqOptions":[{"text":"It is likely a mixture or impure.","correct":true,"explanation":"Different substances in a mixture usually melt at different temperatures, producing a melting range. Impurities therefore make a sample melt over a wide range."},{"text":"It is likely a pure substance.","correct":false,"explanation":"A pure substance normally has a sharp melting point rather than a wide range. The broad range instead suggests the sample is a mixture or impure."},{"text":"It is likely a pure element.","correct":false,"explanation":"A pure element normally melts sharply at one characteristic temperature. A wide melting range points to multiple substances or impurities, so the sample is likely a mixture or impure."},{"text":"It is likely a pure compound.","correct":false,"explanation":"A pure compound also generally has a sharp melting point. The wide range is evidence of a mixture or impurity, not specifically a pure compound."}]},{"id":"6b9b1ffc-3c1b-44d1-9fa4-aa98cbd11868","cardType":"cloze","points":null,"front":"A solution contains a dissolved [ ] in a [ ].","back":"A solution contains a dissolved solute in a solvent.","mcqOptions":[{"text":"A solution contains a dissolved solute in a solvent.","correct":true,"explanation":"The solute is the substance that dissolves, while the solvent is the substance that does the dissolving. Together they form a solution."},{"text":"A solution contains a dissolved solvent in a solute.","correct":false,"explanation":"The solvent does the dissolving, while the solute is dissolved in it. Reversing these terms gives the wrong description; the correct order is solute in solvent."},{"text":"A solution contains a dissolved mixture in a solute.","correct":false,"explanation":"A solution does not contain a dissolved mixture as its defining component. The dissolved substance is the solute, and the liquid or other dissolving medium is the solvent."},{"text":"A solution contains a dissolved solute in a mixture.","correct":false,"explanation":"The solute is the substance that dissolves, not the surrounding medium. A solution therefore contains a dissolved solute in a solvent, not a dissolved solvent in a mixture."}]},{"id":"e2e8c59b-e2f0-40c5-b8fe-66e931982fdd","cardType":"basic","points":1,"front":"Which separation method removes an insoluble solid from a liquid?","back":"Filtration.","mcqOptions":[{"text":"Filtration.","correct":true,"explanation":"Filtration separates an insoluble solid because the liquid passes through the filter paper while solid particles are trapped by its pores."},{"text":"Crystallisation.","correct":false,"explanation":"Crystallisation recovers a dissolved solid from a solution rather than removing an insoluble solid. The correct method is filtration, which traps insoluble particles on filter paper."},{"text":"Simple distillation.","correct":false,"explanation":"Simple distillation separates substances using differences in boiling point, not insolubility. Filtration removes an insoluble solid by trapping it on filter paper."},{"text":"Chromatography.","correct":false,"explanation":"Chromatography separates soluble substances according to their movement through a stationary phase. An insoluble solid is removed from a liquid by filtration."}]},{"id":"4aeb595a-570a-4e23-a45e-6aeb15b5b556","cardType":"basic","points":1,"front":"In filtration, what is the solid left on the filter paper called?","back":"The residue.","mcqOptions":[{"text":"The residue.","correct":true,"explanation":"The residue is the insoluble solid retained by the filter paper after the liquid and dissolved substances have passed through."},{"text":"The filtrate.","correct":false,"explanation":"The filtrate is the liquid that passes through the filter paper, not the solid remaining on it. That trapped solid is called the residue."},{"text":"The distillate.","correct":false,"explanation":"The distillate is the condensed liquid collected during distillation, not a solid trapped during filtration. The solid on the filter paper is the residue."},{"text":"The precipitate.","correct":false,"explanation":"A precipitate is an insoluble solid formed in a chemical reaction, whereas the general name for solid left on filter paper is the residue."}]},{"id":"edfa9bd0-ea7c-4980-9703-429322f04c9d","cardType":"basic","points":1,"front":"In filtration, what is the liquid that passes through the filter paper called?","back":"The filtrate.","mcqOptions":[{"text":"The filtrate.","correct":true,"explanation":"The filtrate is the liquid, including any dissolved substances, that passes through the pores of the filter paper during filtration."},{"text":"The residue.","correct":false,"explanation":"The residue is the solid retained on the filter paper, not the liquid passing through it. The liquid collected beneath the filter is the filtrate."},{"text":"The distillate.","correct":false,"explanation":"The distillate is vapour that has condensed during distillation. In filtration, the liquid passing through the filter paper is called the filtrate."},{"text":"The solvent.","correct":false,"explanation":"The solvent is the liquid that dissolves a solute, but the collected liquid may also contain dissolved substances. The liquid passing through is the filtrate."}]},{"id":"d23c0c22-d2ef-4dd6-a2c5-5581755d0f86","cardType":"basic","points":2,"front":"Why can filtration not separate dissolved salt from water?","back":"Dissolved salt particles pass through the filter paper.","mcqOptions":[{"text":"Dissolved salt particles pass through the filter paper.","correct":true,"explanation":"Dissolved salt exists as particles small enough to travel through the filter paper with the water, so filtration cannot separate the salt."},{"text":"Water particles cannot pass through the filter paper.","correct":false,"explanation":"Water passes through filter paper readily; it is not trapped by it. Filtration fails because dissolved salt particles also pass through with the water."},{"text":"Dissolved salt particles are trapped by the filter paper.","correct":false,"explanation":"Filter paper traps insoluble particles, not dissolved salt particles. Dissolved salt passes through its pores with the water, so another separation method is needed."},{"text":"Salt crystals evaporate with the water during filtration.","correct":false,"explanation":"No evaporation occurs simply because a mixture is filtered. Filtration cannot separate the solution because dissolved salt particles pass through the paper with the water."}]},{"id":"0e7c182a-350c-437a-aeb7-c0274ee7ec24","cardType":"basic","points":1,"front":"Which method collects a dissolved solid from its solution as crystals?","back":"Crystallisation.","mcqOptions":[{"text":"Crystallisation.","correct":true,"explanation":"Crystallisation forms crystals of a dissolved solid by concentrating its solution and allowing it to cool so that excess solute leaves the solution."},{"text":"Filtration.","correct":false,"explanation":"Filtration collects insoluble solids but dissolved particles pass through filter paper. Crystallisation is used to obtain a dissolved solid as crystals from its solution."},{"text":"Simple distillation.","correct":false,"explanation":"Simple distillation is normally used to collect the solvent as a pure liquid. Crystallisation instead collects the dissolved solid while preserving it as crystals."},{"text":"Chromatography.","correct":false,"explanation":"Chromatography separates dissolved substances for identification rather than collecting a bulk solid as crystals. The appropriate method for obtaining crystals is crystallisation."}]},{"id":"9550e57d-9288-498e-9b1e-9466e02f5009","cardType":"basic","points":2,"front":"Why do crystals form when a nearly saturated solution cools?","back":"Less solute stays dissolved in the cooler solution.","mcqOptions":[{"text":"Less solute stays dissolved in the cooler solution.","correct":true,"explanation":"For most solid solutes, solubility decreases as temperature falls. The cooler solvent therefore holds less solute, and the excess solute forms crystals."},{"text":"More solute stays dissolved in the cooler solution.","correct":false,"explanation":"This reverses the usual temperature-solubility relationship for solid solutes. Less solute remains dissolved on cooling, so the excess leaves the solution as crystals."},{"text":"Less solvent stays dissolved in the cooler solution.","correct":false,"explanation":"Solvent does not stay dissolved in its own solution; it is the substance doing the dissolving. Cooling reduces how much solute remains dissolved, producing crystals."},{"text":"More solvent stays dissolved in the cooler solution.","correct":false,"explanation":"Crystals are caused by reduced solubility on cooling, not by an increased amount of solvent. Less solute stays dissolved, and the excess forms crystals."}]},{"id":"b680ceb3-e562-4a84-8543-aacd63c49d45","cardType":"basic","points":1,"front":"Which method obtains pure water from salty water?","back":"Simple distillation.","mcqOptions":[{"text":"Simple distillation.","correct":true,"explanation":"Simple distillation boils the water away from the non-volatile salt and then condenses the water vapour, producing pure liquid water as the distillate."},{"text":"Filtration.","correct":false,"explanation":"Filtration cannot remove dissolved salt because its particles pass through filter paper with the water. Simple distillation evaporates and condenses the water instead."},{"text":"Crystallisation.","correct":false,"explanation":"Crystallisation is used to collect the salt crystals, while much of the water is evaporated. Simple distillation is needed when pure water is the desired product."},{"text":"Separating funnel.","correct":false,"explanation":"A separating funnel separates immiscible liquids that form distinct layers; salty water is a single solution. Pure water is obtained by simple distillation."}]},{"id":"065647cb-3aa2-48f2-b526-b4c22b7e0fb5","cardType":"cloze","points":null,"front":"In simple distillation, the lower-boiling substance evaporates, then cools in the [ ] to form the [ ].","back":"In simple distillation, the lower-boiling substance evaporates, then cools in the condenser to form the distillate.","mcqOptions":[{"text":"In simple distillation, the lower-boiling substance evaporates, then cools in the condenser to form the distillate.","correct":true,"explanation":"The condenser removes thermal energy from the vapour so it becomes liquid. This collected condensed liquid is called the distillate."},{"text":"In simple distillation, the lower-boiling substance evaporates, then cools in the receiver to form the distillate.","correct":false,"explanation":"The receiver collects the liquid after condensation but is not where the vapour is primarily cooled. Cooling occurs in the condenser, producing the distillate."},{"text":"In simple distillation, the lower-boiling substance evaporates, then cools in the condenser to form the filtrate.","correct":false,"explanation":"Filtrate is the liquid that passes through filter paper during filtration. In distillation, vapour cools in the condenser and the resulting liquid is called the distillate."},{"text":"In simple distillation, the lower-boiling substance evaporates, then cools in the fractionating column to form the residue.","correct":false,"explanation":"A fractionating column assists repeated vaporisation and condensation in fractional distillation, while residue remains behind. In simple distillation, the condenser produces the distillate."}]},{"id":"bf6e3d1f-7a01-4ba1-bd79-3cc7a0a9487e","cardType":"basic","points":1,"front":"Which method separates miscible liquids with different boiling points?","back":"Fractional distillation.","mcqOptions":[{"text":"Fractional distillation.","correct":true,"explanation":"Fractional distillation repeatedly vaporises and condenses the liquids in a fractionating column, allowing miscible liquids with different boiling points to be separated."},{"text":"Filtration.","correct":false,"explanation":"Filtration separates an insoluble solid from a liquid, not two miscible liquids. Fractional distillation separates liquids by exploiting their different boiling points."},{"text":"Separating funnel.","correct":false,"explanation":"A separating funnel works for immiscible liquids that form separate layers. Miscible liquids with different boiling points are separated using fractional distillation."},{"text":"Crystallisation.","correct":false,"explanation":"Crystallisation obtains a dissolved solid from a solution rather than separating two liquids. Fractional distillation separates miscible liquids according to boiling point."}]},{"id":"3b3ed55d-f076-4546-9481-5c0fd8c8a827","cardType":"basic","points":1,"front":"In fractional distillation, which liquid is collected first?","back":"The liquid with the lower boiling point.","mcqOptions":[{"text":"The liquid with the lower boiling point.","correct":true,"explanation":"The liquid with the lower boiling point vaporises more readily, reaches the top of the fractionating column first and is condensed and collected first."},{"text":"The liquid with the higher boiling point.","correct":false,"explanation":"The higher-boiling liquid requires a greater temperature to vaporise, so it is collected later. The liquid with the lower boiling point is collected first."},{"text":"The liquid with the larger initial volume.","correct":false,"explanation":"Collection order depends on boiling point, not the initial volume of each liquid. The liquid with the lower boiling point vaporises and is collected first."},{"text":"The liquid with the lower density.","correct":false,"explanation":"Density does not determine which fraction vaporises first. The liquid with the lower boiling point passes through the apparatus and is collected first."}]},{"id":"2e700b70-f74a-4552-a31f-77c50fcbb736","cardType":"cloze","points":null,"front":"Paper chromatography separates dissolved substances because they have different [ ] and different [ ].","back":"Paper chromatography separates dissolved substances because they have different solubilities in the solvent and different attractions to the paper.","mcqOptions":[{"text":"Paper chromatography separates dissolved substances because they have different solubilities in the solvent and different attractions to the paper.","correct":true,"explanation":"A substance travels according to how readily it dissolves in the moving solvent and how strongly it is attracted to the stationary paper."},{"text":"Paper chromatography separates dissolved substances because they have different boiling points and different attractions to the paper.","correct":false,"explanation":"Boiling points do not control movement through chromatography paper. Separation depends on substances having different solubilities in the solvent and different attractions to the paper."},{"text":"Paper chromatography separates dissolved substances because they have different solubilities in the solvent and different particle masses.","correct":false,"explanation":"Particle masses are not the basis of paper chromatography. Substances separate because their solubilities in the solvent and their attractions to the paper differ."},{"text":"Paper chromatography separates dissolved substances because they have different melting points and different electrical conductivities.","correct":false,"explanation":"Neither melting point nor electrical conductivity determines chromatographic movement. The relevant properties are solubility in the solvent and attraction to the paper."}]},{"id":"ab15599c-4af5-4193-be54-e1c408196627","cardType":"basic","points":1,"front":"In a chromatogram, what does several spots from one sample suggest?","back":"The sample is a mixture.","mcqOptions":[{"text":"The sample is a mixture.","correct":true,"explanation":"Each separated substance normally produces its own spot. Several spots therefore indicate that the sample contains multiple substances and is a mixture."},{"text":"The sample is a pure substance.","correct":false,"explanation":"A pure substance normally produces one spot under a given set of conditions. Several spots indicate that multiple substances are present, so the sample is a mixture."},{"text":"The sample is an element.","correct":false,"explanation":"An element is a pure substance and would normally give only one spot. Several spots show that the sample contains multiple substances and is a mixture."},{"text":"The sample is a compound.","correct":false,"explanation":"A pure compound normally produces one spot rather than several. Several spots indicate the presence of multiple substances, meaning that the sample is a mixture."}]},{"id":"78326db6-ac8c-4ecd-86e4-89cf6eb09ac6","cardType":"basic","points":2,"front":"Calculate $R_f$ if a spot travels 3.2 cm and the solvent front travels 8.0 cm.","back":"$$R_f = \\frac{3.2}{8.0} = \\boldsymbol{0.40}$","mcqOptions":[{"text":"$$R_f = \\frac{3.2}{8.0} = \\boldsymbol{0.40}$","correct":true,"explanation":"The retention factor is the spot distance divided by the solvent-front distance. Dividing 3.2 cm by 8.0 cm gives the dimensionless value 0.40."},{"text":"$$R_f = \\frac{3.2}{8.0} = \\boldsymbol{2.50}$","correct":false,"explanation":"This reverses the division and calculates 8.0 divided by 3.2. The spot distance must be divided by the solvent-front distance, giving $R_f=0.40$."},{"text":"$$R_f = \\frac{3.2}{8.0} = \\boldsymbol{0.04}$","correct":false,"explanation":"This decimal-place slip makes the result ten times too small. Dividing 3.2 by 8.0 correctly gives an $R_f$ value of 0.40."},{"text":"$$R_f = \\frac{3.2}{8.0} = \\boldsymbol{0.64}$","correct":false,"explanation":"This value comes from dividing 3.2 by 5.0 rather than by the 8.0 cm solvent-front distance. The correct calculation gives $R_f=0.40$."}]},{"id":"0f828977-a827-4faa-b436-d688fa7caf92","cardType":"basic","points":1,"front":"Why do $R_f$ values have no units?","back":"The distance units cancel.","mcqOptions":[{"text":"The distance units cancel.","correct":true,"explanation":"An $R_f$ value is a ratio of two distances measured in the same unit. Dividing them cancels the distance units, leaving no unit."},{"text":"The distances use centimetres.","correct":false,"explanation":"Measuring both distances in centimetres does not itself remove units. The $R_f$ value is unitless because identical distance units cancel in the ratio."},{"text":"The solvent front equals 1 cm.","correct":false,"explanation":"The solvent front can travel many different distances, so it is not fixed at 1 cm. Units disappear because one distance is divided by another."},{"text":"The spot has negligible mass.","correct":false,"explanation":"The mass of the spot is unrelated to the units of $R_f$. The value has no units because it is a ratio of two distances."}]},{"id":"98dd6632-74ba-4ddb-8a4e-158ce6c3c5cc","cardType":"basic","points":1,"front":"When can an unknown dye be identified using a known dye’s $R_f$ value?","back":"When run under the same conditions.","mcqOptions":[{"text":"When run under the same conditions.","correct":true,"explanation":"An $R_f$ value depends on factors such as the solvent, paper and temperature. The unknown and known dyes must therefore be run under identical conditions."},{"text":"When run using different solvents.","correct":false,"explanation":"Changing the solvent can change a dye’s $R_f$ value, making comparison unreliable. Identification requires the unknown and known dyes to be run under the same conditions."},{"text":"When run over the same distance.","correct":false,"explanation":"A matching travel distance is insufficient because $R_f$ also depends on the solvent-front distance. Known and unknown dyes must instead be compared under the same conditions."},{"text":"When run at different temperatures.","correct":false,"explanation":"Temperature can affect solubility and movement, so using different temperatures invalidates the comparison. The two dyes must be run under the same conditions."}]},{"id":"190a6302-aca8-423f-9e07-62b814e1cf5a","cardType":"cloze","points":null,"front":"For a valid chromatography comparison, use the same [ ], paper and temperature.","back":"For a valid chromatography comparison, use the same solvent, paper and temperature.","mcqOptions":[{"text":"solvent","correct":true,"explanation":"The solvent affects how readily each substance dissolves and travels up the paper. Using the same solvent is essential for comparing chromatograms or $R_f$ values validly."},{"text":"solute","correct":false,"explanation":"The solutes are the substances being compared, so they need not be identical. The solvent, paper and temperature must be kept the same for a valid comparison."},{"text":"dye","correct":false,"explanation":"Using the same dye would prevent comparison between different substances. The solvent must be the same because it strongly affects each substance’s chromatographic movement."},{"text":"distance travelled","correct":false,"explanation":"Travel distance may vary between runs and is accounted for by calculating $R_f$. The solvent, rather than the distance travelled, must be kept the same."}]},{"id":"4a4cae8a-0055-4fa9-9bd9-4508d4b6f818","cardType":"basic","points":2,"front":"Why must the chromatography solvent level start below the baseline?","back":"So spots do not dissolve into the solvent reservoir.","mcqOptions":[{"text":"So spots do not dissolve into the solvent reservoir.","correct":true,"explanation":"Keeping the samples above the solvent reservoir prevents them dissolving directly into it, allowing the rising solvent front to carry them up the chromatography paper for separation."},{"text":"So solvent does not evaporate before rising up the paper.","correct":false,"explanation":"The solvent must evaporate eventually, but this is not controlled by the baseline’s position. The level starts below the baseline so the sample spots do not dissolve into the reservoir."},{"text":"So spots do not travel downwards through the paper.","correct":false,"explanation":"The direction of solvent movement is determined by capillary action, not by whether the baseline is submerged. The baseline stays above the solvent to stop the spots dissolving into the reservoir."},{"text":"So solvent does not rise above the pencil baseline.","correct":false,"explanation":"The solvent front should rise through the paper rather than remain below the baseline. The starting level is kept low so the sample spots do not dissolve into the solvent reservoir."}]},{"id":"7b53036d-6f93-4b8a-ad71-de7aa8f69d17","cardType":"basic","points":2,"front":"Why is the chromatography baseline drawn in pencil, not ink?","back":"Pencil marks do not dissolve in the solvent.","mcqOptions":[{"text":"Pencil marks do not dissolve in the solvent.","correct":true,"explanation":"Graphite in pencil is insoluble in the chromatography solvent, so the baseline stays fixed and does not produce extra marks that could interfere with the chromatogram."},{"text":"Pencil marks travel with the solvent up the paper.","correct":false,"explanation":"Pencil is not chosen because it moves with the solvent; graphite remains fixed on the paper. Ink may dissolve and travel, creating additional spots that confuse the results."},{"text":"Pencil marks make the samples clearer on the paper.","correct":false,"explanation":"Visibility is not the reason for using pencil, and ink may actually be more visible. Pencil is used because its graphite does not dissolve in the chromatography solvent."},{"text":"Pencil marks prevent evaporation of the solvent.","correct":false,"explanation":"The baseline does not cause or prevent evaporation. Pencil is preferred because graphite is insoluble, whereas ink can dissolve and separate into pigments that interfere with the chromatogram."}]}]}],"examCountdown":{"examDate":"2027-05-19","paperLabel":"Paper 1"},"heading":"Elements, compounds and mixtures","title":"Elements, compounds and mixtures Flashcards","topbar":{"backHref":"/igcse/chemistry/edexcel/flashcards"},"topicSidebar":"$L37"}]}],"topicId":"474f12f3-39a5-5511-8589-b317a37463dc","walled":"$L38"}],"$L39","$L3a"]