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21. What is the word equation for the following reaction: MgO + CO2 > MgCO3a.) Magnesium oxide + carbon dioxide > magnesium carbon trioxideb.) magnesium oxide + carbon dioxide > magnesium carbonatec.) magnesium dioxide + carbon oxide > magnesium carbon trioxided.) magnesium dioxide + carbon oxide > magnesium carbonate

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Click and drag on elements in orderThe Cross-Industry Standard Process for Data Mining (CRISP-DM) methodology consists of six major phases. Please order the six phases from the start phase to end phase!Business understanding: The first phase focuses on understanding the data mining project and its objectivesEvaluation: After developing data mining models, we evaluate the performance of competing models based on specific criteriaData understanding: This phase involves collecting raw data and conducting a preliminary analysis to understand the dataData preparation: Specific tasks include record and variable selection, data wrangling, and cleansing for subsequent analysesModeling: This phase involves the selection and execution of several data mining techniques, including linear and logistic regression modelsDeployment: During this final phase, we develop a set of actionable recommendations based on the analysis results

1-bromobutane can be prepared from butan-1-ol and hydrogen bromide. CH3CH2CH2CH2OH + HBr → CH3CH2CH2CH2Br + H2OHydrogen bromide can be made from sodium bromide and 50% concentrated sulfuric acid. (a) The steps for the preparation of impure 1-bromobutane are summarised.1. Dissolve sodium bromide in distilled water in a pear-shaped flask then add 20.0 cm3 of butan-1-ol.2. Surround flask with an ice bath to COOL MIXTURE, before adding concentrated sulfuric acid drop by drop.3. Remove flask from ice bath + add a few ANTI-BUMPING GRANULES to the reaction mixture.4. Set up apparatus for HEATING UNDER REFLUX. Heat mixture in flask for 30 minutes + leave apparatus to cool.5. Rearrange apparatus for distillation + heat mixture until no more 1-bromobutane distils over.(i) Parts of the method are given in BOLD type in Steps 2, 3 and 4. Give a reason why each of these parts is necessary. (3)

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