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Interactive Grade 6 Science Pure & Impure Substances Worksheet

Science · Grade 6 · 15 questions

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Pure & Impure Substances

A scientist wants to check whether a sample of sulfur is pure. Which set of tests would be most useful?

A.Observe its colour and smell, then mix it with water to see if it dissolvesB.Measure its melting point and compare it to the known melting point of pure sulfur (113°C), and check if it melts sharply at one temperatureC.Weigh the sample and compare it to a standard mass of sulfur to check they are equalD.Heat the sample and see if it changes colour, then decide based on the new colour

Sugar (sucrose) is dissolved in water to make a syrup. Which statement correctly classifies this syrup?

A.It is a pure substance because the sugar has fully dissolved and cannot be seenB.It is a mixture because it contains two substances — sugar and water — physically combinedC.It is a new compound because sugar and water have chemically reactedD.It is a pure substance because both sugar and water are pure on their own

When a candle burns, it produces carbon dioxide gas and water vapour. Are these products pure substances?

A.Yes, because carbon dioxide and water are each single compounds with a fixed compositionB.No, because they are produced by a chemical reactionC.No, because gases are always mixturesD.Yes, because burning always produces pure products

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