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Any additional substance would make the sample a mixture and therefore chemically impure."},{"text":"Only one type of atom, with no compounds present.","correct":false,"explanation":"This wrongly excludes pure compounds, whose particles contain more than one type of atom. A pure substance may be one element or one compound, with nothing else mixed in."},{"text":"Only one solid substance, with no liquids mixed in.","correct":false,"explanation":"Physical state does not determine chemical purity. A pure sample contains one element or one compound, whether it is solid, liquid or gas."},{"text":"Only natural substances, with nothing artificial mixed in.","correct":false,"explanation":"Natural origin is a food-marketing idea, not the chemical definition of purity. A chemically pure sample consists of only one element or one compound."}]},{"id":"4e6a1565-e260-4f23-8bfc-a924727b1bc0","cardType":"basic","points":1,"front":"What is the defining feature of the atoms in a pure element?","back":"They all have the same number of protons.","mcqOptions":[{"text":"They all have the same number of protons.","correct":true,"explanation":"An element is defined by its atomic number, which is the number of protons in each nucleus. All atoms of a pure element therefore have the same proton number."},{"text":"They all have the same number of neutrons.","correct":false,"explanation":"Atoms of one element can have different neutron numbers because isotopes exist. They must instead share the same number of protons, which defines the element."},{"text":"They all have the same number of shells.","correct":false,"explanation":"Different elements in the same period can have the same number of occupied electron shells. An element is specifically identified by its number of protons."},{"text":"They all have the same relative atomic mass.","correct":false,"explanation":"Isotopes of an element have different masses, so individual atoms need not have the same mass. They all have the same number of protons."}]},{"id":"c6fc53bb-1493-41b4-a1ec-500ae38fe006","cardType":"basic","points":1,"front":"What holds the different elements together in a compound?","back":"The elements are chemically bonded together.","mcqOptions":[{"text":"The elements are chemically bonded together.","correct":true,"explanation":"A compound forms when atoms of different elements are chemically bonded in fixed arrangements. Separating those elements therefore requires a chemical reaction rather than a physical method."},{"text":"The elements are physically mixed together.","correct":false,"explanation":"Physical mixing produces a mixture, whose components are not bonded and can retain their properties. In a compound, the different elements are chemically bonded together."},{"text":"The elements are electrically charged together.","correct":false,"explanation":"Some compounds contain charged ions, but electrical charge is not the defining feature of every compound. The elements must be chemically bonded together."},{"text":"The elements are loosely surrounded together.","correct":false,"explanation":"Mere proximity does not create a compound and instead describes substances within a mixture. Different elements in a compound are held together by chemical bonds."}]},{"id":"dde0d04c-ffce-4505-ab8a-0d7a954ef929","cardType":"basic","points":2,"front":"Why can water be a pure compound even though it contains hydrogen and oxygen?","back":"Every particle is the same compound, $\\text{H}_2\\text{O}$.","mcqOptions":[{"text":"Every particle is the same compound, $\\text{H}_2\\text{O}$.","correct":true,"explanation":"Chemical purity means that only one substance is present, not that only one element is present. Pure water contains identical water particles with the formula $\\text{H}_2\\text{O}$."},{"text":"Every particle is the same element, $\\text{H}_2$.","correct":false,"explanation":"This mistakes water for elemental hydrogen and leaves out oxygen. Pure water can contain two elements because every particle is the same compound, $\\text{H}_2\\text{O}$."},{"text":"Every particle is a separate mixture, $\\text{H}_2 + \\text{O}$.","correct":false,"explanation":"This treats hydrogen and oxygen as merely mixed rather than chemically bonded. In pure water, every particle is the single compound $\\text{H}_2\\text{O}$."},{"text":"Every particle contains equal atoms, $\\text{HO}$.","correct":false,"explanation":"This assumes hydrogen and oxygen occur in a one-to-one ratio. Each water particle actually contains two hydrogen atoms and one oxygen atom, giving $\\text{H}_2\\text{O}$."}]},{"id":"08ff48fd-674e-412e-af2a-cb0f6b29e4fc","cardType":"basic","points":1,"front":"When does a substance become chemically impure?","back":"As soon as any other substance is mixed into it.","mcqOptions":[{"text":"As soon as any other substance is mixed into it.","correct":true,"explanation":"Chemical purity requires only one element or compound to be present. Adding any amount of another substance creates a mixture, so the original substance becomes impure."},{"text":"As soon as its temperature changes during an experiment.","correct":false,"explanation":"Heating or cooling changes physical conditions but does not necessarily add another substance. Impurity begins when any other substance is mixed into the sample."},{"text":"As soon as its state changes from solid to liquid.","correct":false,"explanation":"Melting is a physical state change and does not alter a substance's chemical purity. A sample becomes impure only when another substance is mixed into it."},{"text":"As soon as some particles separate during melting.","correct":false,"explanation":"Particles becoming less ordered during melting does not introduce a new substance. Chemical impurity occurs when any other substance is mixed into the original material."}]},{"id":"36294c57-e1f6-4afd-960f-08b1c6bbd702","cardType":"basic","points":1,"front":"How does a pure solid change state when it melts?","back":"It melts sharply at one fixed temperature.","mcqOptions":[{"text":"It melts sharply at one fixed temperature.","correct":true,"explanation":"A pure solid has a characteristic melting point, so under fixed pressure it changes from solid to liquid sharply at one specific temperature."},{"text":"It melts gradually across a wide temperature range.","correct":false,"explanation":"A melting range is characteristic of a mixture because its components melt at different temperatures. A pure solid melts sharply at one fixed temperature."},{"text":"It melts sharply at one random temperature.","correct":false,"explanation":"The melting point is a characteristic property, not a random value. A pure solid melts sharply at its fixed melting temperature under given conditions."},{"text":"It melts gradually below its boiling temperature.","correct":false,"explanation":"Although melting normally occurs below boiling, that comparison does not identify purity. A pure solid changes state sharply at one fixed melting temperature."}]},{"id":"f782847e-a3c4-4657-ba9d-409f4540bf47","cardType":"basic","points":1,"front":"How does a mixture usually change state when melting or boiling?","back":"It changes state over a range of temperatures.","mcqOptions":[{"text":"It changes state over a range of temperatures.","correct":true,"explanation":"A mixture contains substances with different melting or boiling points. Consequently, the whole sample usually changes state gradually across a range of temperatures."},{"text":"It changes state at one exact temperature.","correct":false,"explanation":"A sharp, exact change-of-state temperature is expected for a pure substance. A mixture usually changes state over a range because its components have different characteristic temperatures."},{"text":"It changes state at a random temperature each time.","correct":false,"explanation":"A mixture's melting or boiling behaviour is not random, because it depends on its composition. It usually changes state over a reproducible range of temperatures."},{"text":"It changes state only at room temperature.","correct":false,"explanation":"Room temperature has no special role in defining a mixture's change of state. Mixtures usually melt or boil across a range of temperatures."}]},{"id":"02ae2523-bc07-4753-b14b-1bae668cfb67","cardType":"basic","points":2,"front":"Why does a mixture usually melt or boil over a range?","back":"Its different substances change state at different temperatures.","mcqOptions":[{"text":"Its different substances change state at different temperatures.","correct":true,"explanation":"Each substance has characteristic melting and boiling points. Since a mixture contains different substances, its components change state at different temperatures, producing an overall range."},{"text":"Its different substances change state at exactly the same temperature.","correct":false,"explanation":"If all components changed state at exactly the same temperature, that would not explain a range. A mixture shows a range because its substances change state at different temperatures."},{"text":"Its particles change identity at steadily rising temperatures.","correct":false,"explanation":"Melting and boiling are physical changes, so particles do not gain new chemical identities. The range occurs because different substances have different change-of-state temperatures."},{"text":"Its chemical bonds break at different temperatures.","correct":false,"explanation":"Ordinary melting and boiling overcome attractions between particles rather than breaking the chemical bonds within them. The range reflects different substances changing state at different temperatures."}]},{"id":"4064afe6-d6e6-4a3f-929e-312ee8e3a3c8","cardType":"basic","points":2,"front":"What effect can an impurity have on a measured melting point?","back":"It shifts the value from the accepted value and often lowers it.","mcqOptions":[{"text":"It shifts the value from the accepted value and often lowers it.","correct":true,"explanation":"An impurity disrupts the regular structure of a solid, commonly depressing and broadening its melting point. The measured value therefore differs from the accepted value for the pure substance."},{"text":"It shifts the value from the accepted value and always raises it.","correct":false,"explanation":"This reverses the usual melting-point depression caused by impurities. An impurity shifts the result from the accepted value and commonly lowers it rather than always raising it."},{"text":"It keeps the value at the accepted value and often sharpens it.","correct":false,"explanation":"This confuses the behaviour of a pure substance with an impure one. Impurities usually broaden melting and shift the measured point, often to a lower value."},{"text":"It shifts the value to the boiling point and always increases it.","correct":false,"explanation":"Melting-point testing does not turn the measurement into a boiling point. An impurity alters the measured melting point from its accepted value and often lowers it."}]},{"id":"1058229f-c4a6-4e5e-ab07-bbfe1a1ac571","cardType":"basic","points":1,"front":"What does a carton labelled pure orange juice tell you?","back":"Only that nothing extra was added.","mcqOptions":[{"text":"Only that nothing extra was added.","correct":true,"explanation":"In food labelling, “pure” commonly means the product has no added ingredients. It does not mean the juice is a single chemical substance."},{"text":"Only that one chemical substance is present.","correct":false,"explanation":"This applies the laboratory definition of purity to food labelling. Orange juice naturally contains water, sugars, acids and flavour compounds; the label means nothing extra was added."},{"text":"Only that all water was removed.","correct":false,"explanation":"Orange juice naturally contains a large amount of water, and “pure” does not mean dehydrated. The label indicates that nothing extra was added."},{"text":"Only that all pulp was filtered out.","correct":false,"explanation":"Pure orange juice may contain pulp, so filtration is not guaranteed by the label. Here, “pure” indicates that no extra substances were added."}]},{"id":"61395392-db27-45f8-99af-c61360140c61","cardType":"basic","points":2,"front":"Why is pure orange juice chemically a mixture?","back":"It contains water, sugars, acids and flavour compounds together.","mcqOptions":[{"text":"It contains water, sugars, acids and flavour compounds together.","correct":true,"explanation":"Orange juice contains several different chemical substances physically combined, including water, sugars, acids and flavour compounds. It is therefore a mixture despite its food label."},{"text":"It contains only water and dissolved oxygen molecules together.","correct":false,"explanation":"This omits the sugars, acids and flavour compounds responsible for the juice's composition and properties. Orange juice is a mixture containing all these different substances."},{"text":"It contains hydrogen and oxygen chemically bonded together.","correct":false,"explanation":"This describes water, one component of orange juice, rather than the juice as a whole. Orange juice is a mixture of water, sugars, acids and flavour compounds."},{"text":"It contains one compound in several physical states together.","correct":false,"explanation":"A substance can remain chemically pure across different physical states, so that would not explain a mixture. Orange juice contains several distinct substances together."}]},{"id":"dc7e6c2d-5855-4cd7-9ef3-ac8be3f9290e","cardType":"basic","points":1,"front":"What is a mixture?","back":"Two or more substances are present together but are not chemically joined.","mcqOptions":[{"text":"Two or more substances are present together but are not chemically joined.","correct":true,"explanation":"In a mixture, multiple substances coexist without being chemically bonded to one another. They retain their identities and can usually be separated by physical methods."},{"text":"Two or more elements are present together and are chemically bonded.","correct":false,"explanation":"Chemically bonded elements form a compound rather than a mixture. In a mixture, two or more substances are together without being chemically joined."},{"text":"Two or more atoms are present together and are all identical.","correct":false,"explanation":"A collection of identical atoms could be a pure element, not a mixture. A mixture requires two or more different substances that are not chemically joined."},{"text":"Two or more substances are present together and are permanently combined.","correct":false,"explanation":"Permanent chemical combination describes a compound and prevents separation by simple physical means. Mixture components are not chemically joined and retain separate identities."}]},{"id":"2185022b-b8b2-4c4b-98b2-34f82f0e947d","cardType":"basic","points":1,"front":"How can the substances in a mixture be separated?","back":"By physical means.","mcqOptions":[{"text":"By physical means.","correct":true,"explanation":"Mixture components are not chemically bonded, so methods based on physical properties can separate them. Examples include filtration, distillation and chromatography."},{"text":"By nuclear reactions.","correct":false,"explanation":"Nuclear reactions alter atomic nuclei and are unnecessary for separating ordinary mixtures. Because mixture components are not chemically joined, physical methods can separate them."},{"text":"By chemical bonding.","correct":false,"explanation":"Chemical bonding would combine particles rather than separate the components of a mixture. Mixtures are separated by physical means such as filtration or distillation."},{"text":"By atomic decay.","correct":false,"explanation":"Atomic decay concerns unstable nuclei and is unrelated to normal mixture separation. The unbonded substances in a mixture can be separated using physical methods."}]},{"id":"290607b1-953f-4714-81ac-5f2b626dbcfc","cardType":"basic","points":2,"front":"How do you use a measured melting point to test purity?","back":"Compare it with the substance's accepted melting point.","mcqOptions":[{"text":"Compare it with the substance's accepted melting point.","correct":true,"explanation":"A pure substance should melt sharply at its known accepted melting point. A shifted value or melting range provides evidence that the sample contains impurities."},{"text":"Compare it with the substance's accepted boiling point.","correct":false,"explanation":"This compares two different physical properties, so the values are not expected to match. A measured melting point must be compared with the accepted melting point."},{"text":"Compare it with the substance's highest recorded temperature.","correct":false,"explanation":"The highest temperature reached depends on the experiment and is not a characteristic purity standard. Compare the measurement with the substance's accepted melting point."},{"text":"Compare it with the substance's room-temperature state.","correct":false,"explanation":"Knowing whether a substance is solid at room temperature does not give its precise purity. Its measured melting point should match the accepted melting point."}]},{"id":"52f11ea8-f208-4f49-aca4-1b1b1d922601","cardType":"basic","points":2,"front":"Why does a high melting point alone not prove that a sample is pure?","back":"Purity requires matching the accepted value, not simply having a high value.","mcqOptions":[{"text":"Purity requires matching the accepted value, not simply having a high value.","correct":true,"explanation":"Different pure substances naturally have very different melting points. Purity is supported when the sample melts sharply at that substance's accepted value, regardless of whether it is high."},{"text":"Purity requires exceeding the accepted value, not simply matching the known value.","correct":false,"explanation":"A result above the accepted point is a mismatch, not stronger evidence of purity. A pure sample should melt sharply at the substance's accepted value."},{"text":"Purity requires reaching the boiling point, not simply melting at a high value.","correct":false,"explanation":"Boiling point is a separate physical property and is not needed when testing purity by melting. The measured melting point should match the accepted melting point."},{"text":"Purity requires having the highest value, not simply matching an accepted value.","correct":false,"explanation":"This wrongly treats purity as a competition between substances. Each pure substance has its own characteristic melting point, which should match its accepted value."}]},{"id":"5970f15d-67f4-4750-ba79-8e7febd9693b","cardType":"basic","points":1,"front":"What does a sample melting over a temperature range indicate?","back":"The sample is impure.","mcqOptions":[{"text":"The sample is impure.","correct":true,"explanation":"Different components of an impure sample melt at different temperatures, creating a melting range. A pure substance instead melts sharply at its characteristic melting point."},{"text":"The sample is chemically pure.","correct":false,"explanation":"This reverses the diagnostic pattern: a pure sample should melt sharply at one fixed temperature. Melting across a range indicates that other substances are present."},{"text":"The sample is a pure element.","correct":false,"explanation":"Being an element does not follow from melting behaviour, and a pure element should have a sharp melting point. A temperature range indicates an impure sample."},{"text":"The sample is at its boiling point.","correct":false,"explanation":"A melting range concerns the transition from solid to liquid, not boiling from liquid to gas. Such a range indicates that the solid sample is impure."}]},{"id":"5c845759-6ea6-4e49-b066-8036b0fc4135","cardType":"basic","points":2,"front":"What does a sharp change at the accepted temperature support?","back":"The conclusion that the sample is pure.","mcqOptions":[{"text":"The conclusion that the sample is pure.","correct":true,"explanation":"A pure substance changes state at a sharp, characteristic temperature. Matching the accepted temperature therefore supports the conclusion that the sample contains only one substance."},{"text":"The conclusion that the sample is impure.","correct":false,"explanation":"Impurities usually cause melting or boiling over a range, or at a shifted temperature. A sharp change at the accepted temperature supports purity instead."},{"text":"The conclusion that the sample is flammable.","correct":false,"explanation":"Flammability describes how readily a substance burns and is unrelated to the sharpness of a state change. The observation supports the sample being pure."},{"text":"The conclusion that the sample is radioactive.","correct":false,"explanation":"Radioactivity concerns unstable nuclei and cannot be inferred from melting or boiling behaviour. A sharp change at the accepted temperature indicates likely purity."}]},{"id":"359c372c-d150-42ca-bcd5-0a6f3f8e2bca","cardType":"cloze","points":null,"front":"A pure solid melts at a [ ], whereas a mixture usually melts over a range of temperatures.","back":"A pure solid melts at a sharp, fixed temperature, whereas a mixture usually melts over a range of temperatures.","mcqOptions":[{"text":"sharp, fixed temperature","correct":true,"explanation":"Pure substances have particles arranged consistently, so they change state at one characteristic temperature. A mixture contains different substances and commonly melts across a range."},{"text":"low, changing temperature","correct":false,"explanation":"A pure solid does not melt at an arbitrary low temperature. Its melting point is sharp and fixed, while impurities commonly produce a temperature range."},{"text":"high, fixed temperature","correct":false,"explanation":"The melting point need not be high; different pure solids melt at different temperatures. The defining feature is one sharp, fixed temperature."},{"text":"wide, fixed temperature","correct":false,"explanation":"A wide interval contradicts the characteristic behaviour of a pure solid. Pure substances melt sharply at one fixed temperature, whereas mixtures melt over a range."}]},{"id":"f5afbb32-ae16-42e0-bbc8-71e217b79b90","cardType":"cloze","points":null,"front":"A pure solid melts at a sharp, fixed temperature, whereas a mixture usually melts over a [ ].","back":"A pure solid melts at a sharp, fixed temperature, whereas a mixture usually melts over a range of temperatures.","mcqOptions":[{"text":"range of temperatures","correct":true,"explanation":"A mixture contains more than one substance, so its components disrupt one another’s melting behaviour. It therefore melts gradually across a range rather than at one fixed point."},{"text":"single temperature","correct":false,"explanation":"Melting at one characteristic temperature is evidence of a pure substance. Mixtures usually melt over a range because their different components have different melting points."},{"text":"constant pressure","correct":false,"explanation":"Pressure can affect melting point, but it is not a temperature range and does not complete this comparison. The correct description is a range of temperatures."},{"text":"sharp temperature","correct":false,"explanation":"A sharp temperature is typical of a pure solid, not usually a mixture. Different substances in the mixture melt at different temperatures, producing a range."}]},{"id":"40136660-3b6d-425d-9bcd-58d4dba26789","cardType":"cloze","points":null,"front":"Pure ice melts sharply at $\\text{[...]}$, while pure water boils sharply at $100\\,^\\circ\\text{C}$.","back":"Pure ice melts sharply at $\\boxed{0\\,^\\circ\\text{C}}$, while pure water boils sharply at $100\\,^\\circ\\text{C}$.","mcqOptions":[{"text":"$$0\\,^\\circ\\text{C}$","correct":true,"explanation":"At standard atmospheric pressure, pure ice melts at 0 °C. This sharp, accepted melting point is characteristic of pure water."},{"text":"$$-100\\,^\\circ\\text{C}$","correct":false,"explanation":"This confuses the melting point with an extreme low temperature. Pure ice melts at the accepted value of 0 °C under standard atmospheric pressure."},{"text":"$$50\\,^\\circ\\text{C}$","correct":false,"explanation":"This value is above water’s melting point and cannot describe the normal melting of pure ice. The accepted sharp melting temperature is 0 °C."},{"text":"$$100\\,^\\circ\\text{C}$","correct":false,"explanation":"This is the boiling point of pure water at standard atmospheric pressure, not its melting point. Pure ice melts sharply at 0 °C."}]},{"id":"045d8325-56c8-4022-b7f6-73eea27f5ee9","cardType":"cloze","points":null,"front":"Pure ice melts sharply at $0\\,^\\circ\\text{C}$, while pure water boils sharply at $\\text{[...]}$.","back":"Pure ice melts sharply at $0\\,^\\circ\\text{C}$, while pure water boils sharply at $\\boxed{100\\,^\\circ\\text{C}}$.","mcqOptions":[{"text":"$$100\\,^\\circ\\text{C}$","correct":true,"explanation":"At standard atmospheric pressure, pure water boils sharply at 100 °C. This accepted boiling point helps identify whether a sample is pure."},{"text":"$$0\\,^\\circ\\text{C}$","correct":false,"explanation":"This is the melting point of pure ice, not the boiling point of water. At standard atmospheric pressure, pure water boils at 100 °C."},{"text":"$$50\\,^\\circ\\text{C}$","correct":false,"explanation":"This is below the accepted boiling point of water at standard atmospheric pressure. Pure water boils sharply at 100 °C, unless the pressure is changed."},{"text":"$$200\\,^\\circ\\text{C}$","correct":false,"explanation":"This is much higher than water’s normal boiling point and would require different conditions or another substance. Pure water boils at 100 °C at standard pressure."}]},{"id":"4bf17fc5-0dc4-4a44-8430-51751a885c73","cardType":"cloze","points":null,"front":"To judge purity, compare the measured temperature with the [ ]; a range or a value away from it indicates the sample is impure.","back":"To judge purity, compare the measured temperature with the accepted value; a range or a value away from it indicates the sample is impure.","mcqOptions":[{"text":"accepted value","correct":true,"explanation":"The accepted value is the established melting or boiling temperature for a pure substance under stated conditions. Comparing measurements with it helps assess purity."},{"text":"average value","correct":false,"explanation":"An average summarises several measurements but is not necessarily the characteristic temperature of a pure substance. Purity is judged against the accepted value."},{"text":"maximum value","correct":false,"explanation":"The maximum reading alone cannot establish purity and may result from experimental fluctuation. The measured temperature should be compared with the accepted value."},{"text":"estimated value","correct":false,"explanation":"An estimate is an approximate prediction rather than the reference temperature for a pure substance. The correct comparison is with the accepted value."}]},{"id":"9a7875d5-7dc5-4ad1-9b7c-853ef5a52122","cardType":"cloze","points":null,"front":"To judge purity, compare the measured temperature with the accepted value; a range or a value away from it indicates the sample is [ ].","back":"To judge purity, compare the measured temperature with the accepted value; a range or a value away from it indicates the sample is impure.","mcqOptions":[{"text":"impure","correct":true,"explanation":"An impure sample generally changes state over a range or at a temperature different from the accepted value. Either observation indicates that other substances are present."},{"text":"pure","correct":false,"explanation":"A pure sample should show a sharp change at its accepted temperature. A range or shifted value instead indicates that the sample is impure."},{"text":"stable","correct":false,"explanation":"Stability describes whether a substance changes chemically or physically under conditions, not whether its transition temperature matches the accepted value. The sample is impure."},{"text":"reactive","correct":false,"explanation":"Reactivity concerns how a substance reacts with other chemicals and is unrelated to a broadened or shifted melting or boiling temperature. Such behaviour indicates impurity."}]}]}],"examCountdown":{"examDate":"2027-05-17","paperLabel":"Paper 1"},"heading":"8.1.1 Pure substances","title":"8.1.1 Pure substances Flashcards","topbar":{"backHref":"/gcse/chemistry/aqa/flashcards"},"topicSidebar":"$L37"}]}],"topicId":"3d371f1a-7ae8-5c97-8695-aa7984712d37","walled":"$L38"}],"$L39","$L3a"]