C}$ curve M1\n- Levels off horizontally at exactly $40\\text{ cm}^3$ at an earlier time than $150\\text{ seconds}$ A1","marks":2,"order":0,"markingRubric":null,"explanation":null,"options":[]}],"options":[],"explanation":null,"firstAttemptFullMarks":null},{"id":"bfc31b9c-28b0-487f-8ca0-0939e5a6004b","revisionId":"ad3571ba-efd5-4748-a18b-2e32aeaa1b65","questionNumber":null,"questionType":"LA","specification":"A student investigates the rate of reaction between marble chips (calcium carbonate) and dilute nitric acid. In the experiment, the student measures the volume of carbon dioxide gas collected in a gas syringe.","difficulty":3,"difficultyBand":"easy","totalMarks":1,"sourceTitle":null,"calculatorUse":null,"isCalculation":true,"parts":[{"id":"156e43bf-461e-4aa8-950c-ac299cc2284e","label":null,"content":"Give **one** other way that the amount of carbon dioxide produced could be measured to determine the rate of reaction.","markscheme":"- Measure the loss in mass / change in mass of the flask or reaction mixture (using a balance) OR count the number of bubbles of gas produced per unit time B1","marks":1,"order":0,"markingRubric":null,"explanation":null,"options":[]}],"options":[],"explanation":null,"firstAttemptFullMarks":null},{"id":"c0920af3-165a-4865-bcc3-3db32cde7407","revisionId":"a90e87e6-1f58-4de6-8fc7-22805764bd7a","questionNumber":null,"questionType":"LA","specification":"A student investigated the rate of reaction between calcium carbonate (marble chips) and dilute hydrochloric acid by measuring the volume of carbon dioxide gas produced.\n\nThe student's results are shown in the table below:\n\n| Time / s | Volume of carbon dioxide / $\\text{cm}^3$ |\n| :---: | :---: |\n| 0 | 0 |\n| 15 | 24 |\n| 30 | 41 |\n| 45 | 52 |\n| 60 | 59 |\n| 75 | 63 |\n| 90 | 65 |\n| 105 | 66 |\n| 120 | 66 |","difficulty":3,"difficultyBand":"easy","totalMarks":3,"sourceTitle":null,"calculatorUse":null,"isCalculation":false,"parts":[{"id":"44e823de-c5c1-4221-92e0-4b2cde3c99bf","label":null,"content":"Draw a graph of the volume of carbon dioxide gas produced against time.\n\n![A blank graph grid with the horizontal x-axis labelled 'Time / s' from 0 to 120 with major divisions every 20 seconds, and the vertical y-axis labelled 'Volume of carbon dioxide / cm³' from 0 to 70 with major divisions every 10 units.](https://assets.mathsgenie.co.uk/aqa-qb/713ca886-5344-450a-b217-795414191dd2.png)","markscheme":"- Plots points accurately within $\\pm 1\\text{ mm}$ (half a small square), allowing at most 1 plotting error M1\n- Draws a single, smooth, continuous curve of best fit starting at $(0,0)$, rising steeply at first and then flattening out (becoming horizontal) at $66\\text{ cm}^3$ by $105\\text{ s}$ A1\n- Correctly labels both axes with units ($x$-axis: Time / s; $y$-axis: Volume of carbon dioxide / $\\text{cm}^3$) using a linear scale covering more than half of the grid space B1","marks":3,"order":0,"markingRubric":null,"explanation":null,"options":[]}],"options":[],"explanation":null,"firstAttemptFullMarks":null}],"subjectCode":"gcse_chemistry","summaries":[{"id":"00286838-236c-45c3-8dfb-7969159e6b03","difficultyBand":"easy","calculatorUse":null,"totalMarks":1},{"id":"026999e6-55d6-4720-bd20-b8311fe409a4","difficultyBand":"easy","calculatorUse":null,"totalMarks":3},{"id":"03eab6e1-eb3c-4808-bb4a-df75f5927fe4","difficultyBand":"medium","calculatorUse":null,"totalMarks":3},{"id":"04739728-4096-48b7-a05f-5a851a75aef7","difficultyBand":"easy","calculatorUse":null,"totalMarks":2},{"id":"0529a19c-cf77-40cd-a286-58b20cceef33","difficultyBand":"easy","calculatorUse":null,"totalMarks":2},{"id":"05e913cc-baae-417a-8cd8-51294c0d4b3c","difficultyBand":"easy","calculatorUse":null,"totalMarks":2},{"id":"077da557-ea02-436c-a73c-111ca8f5757e","difficultyBand":"easy","calculatorUse":null,"totalMarks":1},{"id":"085e5e7f-71de-41d4-b4ad-4bec8f1afe6f","difficultyBand":"medium","calculatorUse":null,"totalMarks":6},{"id":"0876e94d-ebef-4068-9a52-9c5ff73cbbc4","difficultyBa

Rates of reaction

Question 92

Rates of reaction Questions

Rates of reaction

Question 92

Rates of reaction Questions