M.C.Q.: Choose the correct answer(s) ✅

• 1. During a chemical transformation:
• products appear reactants appear products disappear reactants disappear nothing appears or disappears

• 2. The dissolution of sugar in water is:
• a mixture a chemical transformation a physical transformation
  
  because the sugar:
  does not disappear disappears

• 3. In alkane combustions (methane, butane, etc.), dioxygen is:
• a reactant a product the fuel the oxidiser always necessary

• 4. During complete carbon combustion:
• carbon and dioxygen are the products carbon and dioxygen are the reactants carbon and carbon dioxide are the reactants carbon dioxide is one of the products carbon dioxide is the only product carbon monoxide is the only product

• 5. The reactants of butane combustion are:
• butane carbon dioxygen carbon dioxide methane propane

• 6. Complete butane combustion produces:
• carbon carbon dioxide dioxygen water copper sulfate the same chemical species as complete methane combustion

• 7. Water can be identified:
• by tasting it by its transparency using limewater, which turns cloudy on contact with it with anhydrous copper sulfate powder, which turns blue in the presence of water

• 8. During the carbon dioxide identification test with limewater, a precipitate forms:
• because limewater becomes clear because fine insoluble suspended particles form because carbon dioxide falls to the bottom of the container of calcium carbonate of calcium dioxide

• 9. The product of complete carbon combustion:
• is identified using anhydrous copper sulfate powder is identified using limewater cannot be identified

📊 RESULT: