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gcse — chemistry: february 2023 mock materials Questions & Correct Answers/ Graded A+

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what apparatus is used in the gas syringe practical? : ⦁ gas syringe ⦁ stand ⦁ boss & clamp ⦁ measuring cylinder ⦁ dilute hydrochloric acid (different cont.) ⦁ calcium carbonate ⦁ conical flask ⦁ stop clock how do you perform the gas syringe practical? : ⦁ set up gas syringe with boss & clamp ⦁ using a measuring cylinder, 50cm3 of HCl to conical flask ⦁ add 0.4g of calcium carbonate to the flask ⦁ connect gas syringe and start stop watch 2 ⦁ every 10 seconds record the volume of gas produced ⦁ repeat with different concentrations what is the equation for the mean rate of reaction? : rate of reaction = total mass of gas produced (cm3) / reaction time (s) what are the two hazards to the gas syringe? : hydrochlorice acid causes skin & eye irritation (wear eye protection) fizzing in reaction mixtur

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