Chemistry core quiz (1)
Quiz by Reem Bakr
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- Q 1/39Score 0The diagram shows the paper chromatograms of four substances, W, X, Y and Z. Which two substances are pure?29X and ZW and XW and YX and Y
39 questions
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- Q1The diagram shows the paper chromatograms of four substances, W, X, Y and Z. Which two substances are pure?X and ZW and XW and YX and Y60s
- Q2A fruit drink coloured orange contains a dissolved mixture of red and yellow colouring agents. One of these colouring agents is suspected of being illegal. Which method could be used to show the presence of this illegal colouring agent?filterationdistillationevaporationchromatography45s
- Q3A student is investigating a coloured mixture using chromatography. Where should he place the coloured mixture?just above the pencil linejust below the pencil lineon the pencil linein the solvent45s
- Q4In the chromatography experiment shown, which label represents the solvent front?BCAD45s
- Q5A sample of liquid X turns blue cobalt(II) chloride paper pink. The sample boils at 102°C. Which statements are correct? 1) X contains water. 2 ) X is impure water. 3 ) X freezes above 0 °C.1, 2 and 31 and 3 only2 and 3 only1 and 2 only45s
- Q6A student carried out paper chromatography on a mixture of amino acids. The student sprayed the dried chromatogram with a locating agent. What is the function of the locating agent?to preserve the amino acidsto dissolve the amino acidsto form coloured spots with the amino acidsto stop the amino acids reacting45s
- Q7Impurities change the melting and boiling points of substances. Sodium chloride is added to a sample of pure water. How does the addition of sodium chloride affect the melting point and boiling point of the water?Melting point decreases and boiling point decreasesMelting point increases and boiling point increasesMelting point decreases and boiling point increasesMelting point increases and boiling point decreases60s
- Q8Propanone, is a liquid at room temperature. What is the boiling point of pure propanone?56 °C51 °C to 61 °C–61 °C to –51 °C–56 °C60s
- Q9A student carries out an experiment to prepare pure magnesium sulfate crystals. The diagram shows the first stage of the preparation. He adds magnesium carbonate until no more reacts. Which process should he use for the next stage?evaporationneutralisationfilterationcrystallisation45s
- Q10A student separates salt from a mixture of salt and sand. What is the correct order of steps for the student to take?filter → shake with water → evaporatefilter → evaporate → shake with watershake with water → evaporate → filtershake with water → filter → evaporate60s
- Q11Alcohol and water are completely miscible. This means when mixed together they form only one liquid layer. Which method is used to separate alcohol from water?crystallisationprecipitationfractional distillationfiltration45s
- Q12The diagram shows how muddy water can be purified. Which process for purifying the muddy water is shown?solvent extractionfiltrationdistillationcrystallisation45s
- Q13Which compound is not used as a fertiliser?ammonium sulfatepotassium nitratecalcium carbonateammonium phosphate45s
- Q14Lime (calcium oxide) is used to treat waste water from a factory. Which substance is removed by the lime?sulphuric acidammoniasodium chloridesodium hydroxide45s
- Q15Iron from a blast furnace is treated with oxygen and with calcium oxide to make steel. Which substances in the iron are removed?DABC60s
