Under what conditions the interaction – chlorine + hydrogen = hydrogen chloride takes place with an explosion:
A: when stirring; B: in the cold; C: at maximum contact and in the dark; D: at maximum contact and direct sunlight? Task 2: In separate cups are placed a teaspoon of the substances salt, sugar, flour and baking soda. They are covered with vinegar. Which of the substances will interact with the vinegar at room temperature? ?3: Under what conditions hydrogen and oxygen are obtained from water; A: at room temperature B: when cooling C: in the dark D: when an electric current flows? 4: Which of the following changes is not a sign of a chemical reaction:A: Heat release B: Stirring; C: Light releasing D: Dissolving sludge?
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