C1 - Cooking and Chemical Change 0.0 / 5 ? ChemistryCooking and food additivesGCSEOCR Created by: RachelcfxCreated on: 03-05-16 14:51 How does cooking cause chemical changes? Cooking food produces new substances, the process is irreversible. 1 of 7 What chemical change does baking powder undergo when heated? Thermal decompositition. 2 of 7 What is thermal decomposition? When a SUBSTANCE BREAKS DOWN into SIMPLER SUBSTANCES when heated. 3 of 7 What chemical does baking powder contain? Sodium hydrogencarbonate. 4 of 7 What is the word equation for sodium hydrocarbonate's thermal decomposition? Sodium hydrocarbonate ---> sodium carbonate + carbon dioxide + water 5 of 7 What is the symbol equation for sodium hydrocarbonate's thermal decomposition? 2NaHCO3 ---> Na2CO3 + CO2 +H2O 6 of 7 What chemical test can you use to check that carbon dioxide has been formed? CARBON DIOXIDE can be tested using LIMEWATER - CO2 turns limewater CLOUDY. 7 of 7
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