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this sound. The squeaky pop is caused by hydrogen reacting rapidly with oxygen."},{"text":"Carbon dioxide","correct":false,"explanation":"Carbon dioxide extinguishes a flame and gives no squeaky pop. Hydrogen is the gas identified by this characteristic sound with a lit splint."},{"text":"Chlorine","correct":false,"explanation":"Chlorine has different chemical tests and does not give this result with a lit splint. Hydrogen produces the squeaky pop."}]},{"id":"be563ad4-9a58-4d45-9931-4f149d2e49fc","cardType":"basic","points":1,"front":"What apparatus is used to test for hydrogen?","back":"A lit splint.","mcqOptions":[{"text":"A lit splint.","correct":true,"explanation":"A lit splint provides a flame that can ignite hydrogen mixed with air, producing the characteristic squeaky pop."},{"text":"A glowing splint.","correct":false,"explanation":"A glowing splint is used to test for oxygen because oxygen relights it. Hydrogen requires a flame from a lit splint."},{"text":"A limewater test.","correct":false,"explanation":"Limewater tests for carbon dioxide by turning milky, not for hydrogen. A lit splint is needed to observe hydrogen's characteristic pop."},{"text":"A pH indicator.","correct":false,"explanation":"A pH indicator detects acidity or alkalinity, not hydrogen gas. The hydrogen test uses a flame to cause the identifying pop."}]},{"id":"9ecacbbc-7a31-44a1-b58f-7844c0280a1b","cardType":"basic","points":1,"front":"What observation identifies hydrogen?","back":"A squeaky pop.","mcqOptions":[{"text":"A squeaky pop.","correct":true,"explanation":"Hydrogen burns rapidly when it meets oxygen in the air, creating a small explosion heard as a squeaky pop."},{"text":"A glowing splint relights.","correct":false,"explanation":"Relighting a glowing splint identifies oxygen, not hydrogen. Hydrogen is identified by the squeaky pop produced when it burns."},{"text":"A flame is extinguished.","correct":false,"explanation":"Extinguishing a flame is associated with gases such as carbon dioxide. Hydrogen burns and produces a squeaky pop instead."},{"text":"A white precipitate forms.","correct":false,"explanation":"A precipitate is a solid formed in a solution and is not the hydrogen test observation. Hydrogen gives a squeaky pop with a flame."}]},{"id":"d3726a46-c329-4a27-a492-9f85d97829e4","cardType":"basic","points":1,"front":"Where is the gas collected before testing for hydrogen?","back":"Collect the gas in a test tube.","mcqOptions":[{"text":"Collect the gas in a test tube.","correct":true,"explanation":"The gas is collected in a test tube so it can be held safely while the lit splint is brought to its opening."},{"text":"Collect the gas in a beaker.","correct":false,"explanation":"A beaker is open and poorly suited to holding a small gas sample for this test. The gas should be collected in a test tube."},{"text":"Collect the gas in a conical flask.","correct":false,"explanation":"A conical flask can contain gas but is not the standard apparatus for this small test. Hydrogen is collected in a test tube."},{"text":"Collect the gas in a measuring cylinder.","correct":false,"explanation":"A measuring cylinder is designed for measuring liquid volume and is not the usual container for this flame test. A test tube is used."}]},{"id":"9b1cc125-ab74-4001-9a3f-efa9d5d8b387","cardType":"basic","points":1,"front":"Where is the lit splint held during the hydrogen test?","back":"Hold the splint at the test tube's open end.","mcqOptions":[{"text":"Hold the splint at the test tube's open end.","correct":true,"explanation":"Holding the flame at the opening lets it contact hydrogen escaping from the tube while keeping the reaction away from the main apparatus."},{"text":"Hold the splint at the test tube's closed end.","correct":false,"explanation":"The closed end cannot release the collected gas, so the flame would not meet the hydrogen. The splint belongs at the open end."},{"text":"Hold the splint in the test tube's middle.","correct":false,"explanation":"Placing the splint inside the tube risks inserting the flame into the gas sample and is not the standard method. Use the open end."},{"text":"Hold the splint beside the test tube's base.","correct":false,"explanation":"Hydrogen escapes from the opening, not the base. Holding the splint there would prevent reliable contact with the gas and its identifying reaction."}]},{"id":"6d115c22-f719-4b1b-88c0-eaa1b022ef6c","cardType":"basic","points":2,"front":"Why does hydrogen ignite during the test?","back":"Hydrogen is flammable, so it ignites in the splint's flame.","mcqOptions":[{"text":"Hydrogen is flammable, so it ignites in the splint's flame.","correct":true,"explanation":"Hydrogen is flammable, so the heat from the splint supplies the activation energy needed for it to react with oxygen and burn."},{"text":"Hydrogen is acidic, so it ignites in the splint's flame.","correct":false,"explanation":"Acidity does not explain ignition; flammability does. Hydrogen burns because it reacts with oxygen when supplied with enough energy from the flame."},{"text":"Hydrogen is dense, so it ignites in the splint's flame.","correct":false,"explanation":"Density affects how a gas behaves and is not the cause of burning. Hydrogen ignites because it is flammable and reacts with oxygen."},{"text":"Hydrogen is soluble, so it ignites in the splint's flame.","correct":false,"explanation":"Solubility describes dissolving in a solvent and does not cause combustion. Hydrogen ignites because it is flammable in the presence of oxygen."}]},{"id":"5acd1ac7-95f3-446b-a652-fec8d95e3669","cardType":"basic","points":2,"front":"What causes the squeaky pop?","back":"A small explosion as hydrogen reacts with oxygen in the air.","mcqOptions":[{"text":"A small explosion as hydrogen reacts with oxygen in the air.","correct":true,"explanation":"Hydrogen mixes with oxygen in the air and reacts very rapidly when ignited, releasing energy as a small explosion and producing the squeaky sound."},{"text":"A precipitate as hydrogen reacts with water in the air.","correct":false,"explanation":"No solid precipitate forms in this flame test, and water is not the reacting gas. The sound comes from hydrogen reacting rapidly with oxygen."},{"text":"A colour change as hydrogen reacts with nitrogen in the air.","correct":false,"explanation":"The hydrogen test is identified by sound, not colour, and oxygen is the relevant reacting gas. Hydrogen and oxygen produce the small explosion."},{"text":"A pressure drop as hydrogen dissolves in oxygen in the air.","correct":false,"explanation":"The gas does not simply dissolve, and a pressure drop does not cause the squeaky pop. Rapid combustion with oxygen creates the sound."}]},{"id":"f2b4380e-0a3d-4353-b3cb-f8a431963222","cardType":"basic","points":1,"front":"How does hydrogen burn when tested with a lit splint?","back":"Hydrogen burns very quickly.","mcqOptions":[{"text":"Hydrogen burns very quickly.","correct":true,"explanation":"Hydrogen reacts rapidly with oxygen when ignited, so its combustion is fast and produces the characteristic squeaky pop."},{"text":"Hydrogen burns very slowly.","correct":false,"explanation":"Hydrogen combustion is rapid rather than slow. Its fast reaction with oxygen creates the small explosion responsible for the squeaky pop."},{"text":"Hydrogen does not burn.","correct":false,"explanation":"Hydrogen is flammable and ignites when tested with a flame. Its rapid combustion with oxygen produces the characteristic sound."},{"text":"Hydrogen burns without oxygen.","correct":false,"explanation":"Combustion requires oxygen, which hydrogen obtains from the air. The gas burns rapidly because it reacts with oxygen when ignited."}]},{"id":"6c677320-0998-4501-a281-20accb342a11","cardType":"basic","points":1,"front":"What is the only product when hydrogen burns in oxygen?","back":"The only product is water.","mcqOptions":[{"text":"The only product is water.","correct":true,"explanation":"Hydrogen combines with oxygen during combustion to form water, so water is the only chemical product in the balanced reaction."},{"text":"The only product is carbon dioxide.","correct":false,"explanation":"Carbon dioxide requires carbon as a reactant, but hydrogen burning uses hydrogen and oxygen only. The product is water."},{"text":"The only product is oxygen.","correct":false,"explanation":"Oxygen is a reactant consumed during combustion, not the product. Hydrogen and oxygen combine to form water."},{"text":"The only product is hydrogen peroxide.","correct":false,"explanation":"Hydrogen peroxide is not the product of ordinary hydrogen combustion. The reaction of hydrogen with oxygen forms water."}]},{"id":"29e50dac-5794-44f4-87b3-b9b4839b3f37","cardType":"basic","points":2,"front":"Why is sound used to identify hydrogen rather than colour change?","back":"The sound is the identifying sign, not a colour change.","mcqOptions":[{"text":"The sound is the identifying sign, not a colour change.","correct":true,"explanation":"Hydrogen combustion produces a distinctive squeaky pop, whereas no characteristic colour change is used to identify the gas."},{"text":"The colour change is the identifying sign, not a sound.","correct":false,"explanation":"Hydrogen is not identified by a colour change. The characteristic squeaky pop produced on ignition is the relevant observation."},{"text":"The precipitate is the identifying sign, not a sound.","correct":false,"explanation":"This test does not produce a precipitate because it uses a flame rather than a solution reaction. The identifying observation is the sound."},{"text":"The temperature change is the identifying sign, not a sound.","correct":false,"explanation":"Although combustion releases energy, temperature change is not the standard identification. The squeaky pop is the distinctive sign for hydrogen."}]},{"id":"720807a4-f434-4361-8203-012e755a4433","cardType":"basic","points":1,"front":"What is a burning splint?","back":"A thin wooden splint that is lit and still has a flame.","mcqOptions":[{"text":"A thin wooden splint that is lit and still has a flame.","correct":true,"explanation":"A burning splint is a thin piece of wood with an active flame, providing the ignition source needed to test whether hydrogen is present."},{"text":"A thin wooden splint that is glowing but has no flame.","correct":false,"explanation":"A glowing splint has no flame and is used for the oxygen test. A burning splint must still have a flame."},{"text":"A metal wire that is lit and still has a flame.","correct":false,"explanation":"The apparatus is a wooden splint, not metal wire. It must also be lit and burning to provide the flame for the hydrogen test."},{"text":"A glass rod that is heated but has no flame.","correct":false,"explanation":"A heated glass rod is not a burning splint and does not provide the standard flame. The test uses a flaming thin wooden splint."}]},{"id":"ab2262eb-3ee9-4720-87da-ccd7dc9c0dc2","cardType":"basic","points":1,"front":"What type of splint is needed for the hydrogen test?","back":"Use a burning splint, not a glowing splint.","mcqOptions":[{"text":"Use a burning splint, not a glowing splint.","correct":true,"explanation":"Hydrogen needs a flame to ignite and produce its squeaky pop, so a burning splint is required rather than one that is merely glowing."},{"text":"Use a glowing splint, not a burning splint.","correct":false,"explanation":"A glowing splint is the test for oxygen because oxygen relights it. Hydrogen requires the flame of a burning splint."},{"text":"Use a moist splint, not a burning splint.","correct":false,"explanation":"Moistening the wood is not the identifying requirement and may weaken the flame. Hydrogen is tested with a burning splint."},{"text":"Use a metal splint, not a burning splint.","correct":false,"explanation":"A metal splint is not the standard apparatus and cannot provide the required wooden flame. The hydrogen test uses a burning splint."}]},{"id":"0af68723-7c8a-4aff-8365-8e369bc1ce1b","cardType":"basic","points":1,"front":"What does a glowing splint test for?","back":"A glowing splint tests for oxygen.","mcqOptions":[{"text":"A glowing splint tests for oxygen.","correct":true,"explanation":"Oxygen supports combustion strongly enough to relight a glowing splint, making this the standard qualitative test for oxygen gas."},{"text":"A glowing splint tests for hydrogen.","correct":false,"explanation":"A glowing splint tests for oxygen by relighting. Hydrogen requires a burning splint and produces a squeaky pop."},{"text":"A burning splint tests for oxygen.","correct":false,"explanation":"A burning splint is used when testing hydrogen, which burns with a squeaky pop. Oxygen is tested with a glowing splint."},{"text":"A limewater test tests for oxygen.","correct":false,"explanation":"Limewater is used to test for carbon dioxide, turning milky in its presence. Oxygen is identified using a glowing splint."}]},{"id":"d18ee345-a9a8-45cd-a0da-108e8b2869fb","cardType":"basic","points":1,"front":"What volume of gas should be used in the hydrogen test?","back":"Keep the gas volume small.","mcqOptions":[{"text":"Keep the gas volume small.","correct":true,"explanation":"A small gas sample limits the amount of combustible hydrogen-air mixture, making the test safer while still producing an observable pop."},{"text":"Keep the gas volume large.","correct":false,"explanation":"A large sample creates more combustible mixture and increases the force of the reaction. The test should use a small volume."},{"text":"Keep the gas volume constant.","correct":false,"explanation":"Consistency may help compare tests, but the key safety requirement is limiting the amount of gas. A small volume should be used."},{"text":"Keep the gas volume unknown.","correct":false,"explanation":"An unknown volume cannot ensure that the reaction remains safe. The sample should deliberately be kept small before applying the flame."}]},{"id":"56d32db8-d926-45a7-a2f2-1deeaab37ae7","cardType":"basic","points":2,"front":"Why should only a small volume of hydrogen be tested?","back":"Larger amounts of hydrogen and air burn more violently.","mcqOptions":[{"text":"Larger amounts of hydrogen and air burn more violently.","correct":true,"explanation":"Increasing the quantities of hydrogen and oxygen-containing air increases the amount of combustible mixture, releasing more energy and causing a more violent reaction."},{"text":"Larger amounts of hydrogen and air burn less violently.","correct":false,"explanation":"More combustible mixture generally releases more energy when ignited, increasing violence rather than reducing it. This is why only a small volume is tested."},{"text":"Larger amounts of hydrogen and air burn without oxygen.","correct":false,"explanation":"Hydrogen combustion still requires oxygen from the air, regardless of sample size. Larger amounts are hazardous because they can burn more violently."},{"text":"Larger amounts of hydrogen and air burn at a lower temperature.","correct":false,"explanation":"The safety concern is the greater energy release and violence of the reaction, not simply a lower temperature. Small samples reduce the hazard."}]},{"id":"8172c90f-d799-4552-8221-4715c7a42f13","cardType":"basic","points":1,"front":"What is the equation for hydrogen burning in oxygen?","back":"2H₂ + O₂ → 2H₂O","mcqOptions":[{"text":"2H₂ + O₂ → 2H₂O","correct":true,"explanation":"Two hydrogen molecules react with one oxygen molecule to form two water molecules, conserving two hydrogen atoms and two oxygen atoms on each side."},{"text":"H₂ + O₂ → H₂O","correct":false,"explanation":"This equation is not balanced because there are two oxygen atoms on the left but only one on the right. Coefficients of 2 are needed for hydrogen and water."},{"text":"2H₂ + 2O₂ → 2H₂O","correct":false,"explanation":"There are four oxygen atoms on the left but only two on the right, so the equation is unbalanced. One oxygen molecule is required for two hydrogen molecules."},{"text":"H₂ + O₂ → 2H₂O","correct":false,"explanation":"The right side contains four hydrogen atoms, but the left side contains only two. Balancing both elements gives 2H₂ + O₂ → 2H₂O."}]},{"id":"831c1c48-47a5-4b4d-abe8-2e9da31fb078","cardType":"cloze","points":null,"front":"A hydrogen test uses a [ ].","back":"A hydrogen test uses a lit splint.","mcqOptions":[{"text":"lit splint","correct":true,"explanation":"A lit splint is placed near the hydrogen. Hydrogen reacts with oxygen and burns rapidly, producing the characteristic squeaky pop."},{"text":"glowing splint","correct":false,"explanation":"A glowing splint is used to test for oxygen, which relights it. Hydrogen requires a lit splint so it can ignite and produce a squeaky pop."},{"text":"damp litmus paper","correct":false,"explanation":"Litmus paper tests whether a substance is acidic or alkaline, not whether hydrogen is present. A lit splint identifies hydrogen by its squeaky pop."},{"text":"limewater","correct":false,"explanation":"Limewater is used to test for carbon dioxide, turning cloudy when the gas is bubbled through it. Hydrogen is tested with a lit splint."}]},{"id":"714892ac-6b44-48de-8b95-81ed6d9c07c0","cardType":"cloze","points":null,"front":"Hydrogen is identified by a [ ].","back":"Hydrogen is identified by a squeaky pop.","mcqOptions":[{"text":"squeaky pop","correct":true,"explanation":"Hydrogen is identified by a squeaky pop when a lit splint is brought close to it. The sound comes from rapid combustion with oxygen."},{"text":"glowing splint relighting","correct":false,"explanation":"A glowing splint relighting is the positive test for oxygen, not hydrogen. Hydrogen burns with a characteristic squeaky pop when tested using a lit splint."},{"text":"cloudy limewater","correct":false,"explanation":"Cloudy limewater indicates carbon dioxide because a calcium carbonate precipitate forms. Hydrogen does not turn limewater cloudy; its test gives a squeaky pop."},{"text":"bleached damp litmus","correct":false,"explanation":"Bleaching damp litmus is associated with chlorine, which has bleaching properties. Hydrogen is identified by the squeaky pop produced during combustion."}]},{"id":"07f79c91-8f8a-430e-9136-cbbd7e27be2e","cardType":"cloze","points":null,"front":"The squeaky pop occurs because hydrogen reacts with [ ] from the air.","back":"The squeaky pop occurs because hydrogen reacts with oxygen from the air.","mcqOptions":[{"text":"oxygen","correct":true,"explanation":"Hydrogen reacts with oxygen in the air during combustion. The rapid exothermic reaction produces water and causes the characteristic squeaky pop."},{"text":"nitrogen","correct":false,"explanation":"Nitrogen makes up most of the air but is relatively unreactive in this test. The squeaky pop occurs because hydrogen combusts rapidly with oxygen."},{"text":"carbon dioxide","correct":false,"explanation":"Carbon dioxide is not the gas responsible for hydrogen’s squeaky pop and does not support combustion. Hydrogen reacts with oxygen from the air."},{"text":"water vapour","correct":false,"explanation":"Water vapour is a product of hydrogen combustion, not the reacting gas that causes the sound. Hydrogen reacts with oxygen from the air."}]},{"id":"ec4f3aa2-c89f-4e79-89e1-5c1464209cf5","cardType":"cloze","points":null,"front":"Hydrogen combustion produces only [ ].","back":"Hydrogen combustion produces only water.","mcqOptions":[{"text":"water","correct":true,"explanation":"Hydrogen reacts with oxygen during combustion to form water. Because the reactants contain only hydrogen and oxygen, water is the only product."},{"text":"carbon dioxide","correct":false,"explanation":"Carbon dioxide forms when carbon-containing fuels burn. Hydrogen contains no carbon, so its combustion produces water rather than carbon dioxide."},{"text":"oxygen","correct":false,"explanation":"Oxygen is consumed as hydrogen burns; it is a reactant, not the product. The reaction forms water from hydrogen and oxygen."},{"text":"hydrogen peroxide","correct":false,"explanation":"Hydrogen peroxide is not the usual product of hydrogen combustion. Under the test conditions, hydrogen reacts with oxygen to produce water."}]},{"id":"28bf2760-4d6d-4d71-b54c-afa4db84e2cf","cardType":"cloze","points":null,"front":"A glowing splint should not be used because it tests for [ ].","back":"A glowing splint should not be used because it tests for oxygen.","mcqOptions":[{"text":"oxygen","correct":true,"explanation":"A glowing splint is the test for oxygen because oxygen relights the glowing wood. Hydrogen needs a lit splint and produces a squeaky pop."},{"text":"hydrogen","correct":false,"explanation":"Hydrogen is tested with a lit splint, which produces a squeaky pop. A glowing splint is used for oxygen because it relights in that gas."},{"text":"carbon dioxide","correct":false,"explanation":"Carbon dioxide is tested using limewater, which turns cloudy. A glowing splint specifically tests for oxygen because oxygen supports combustion."},{"text":"chlorine","correct":false,"explanation":"Chlorine can be identified using damp litmus paper because it bleaches the paper. A glowing splint is used to test for oxygen."}]}]}],"examCountdown":{"examDate":"2027-05-17","paperLabel":"Paper 1"},"heading":"8.2.1 Test for hydrogen","title":"8.2.1 Test for hydrogen Flashcards","topbar":{"backHref":"/gcse/chemistry/aqa/flashcards"},"topicSidebar":"$L37"}]}],"topicId":"54d8a2c8-1e68-5934-b40a-1e00fe846be2","walled":"$L38"}],"$L39","$L3a"]