7.When a match burns, it undergoes a chemical change. Matches use sulfur, phosphate and a friction agent held together by a binding agent. With a match, heat ignites the phosphorous on the head of the match. To keep the fire going, the match needs more oxygen than is available from the air alone.
in short po is
7.heat ignites the phosphorous on the head of the match.
8The temperature of the steel wool plus hydrogen peroxide plus salt mixture increases, so the reaction is exothermic. Rusting is exothermic. It usually happens so slowly that it is not noticed.
inshort
8.so the reaction is exothermic. Rusting is exothermic
9.When the two substances are mixed together, hydrogen ions in the vinegar react with the sodium and bicarbonate ions in the baking soda. This initial reaction results in two new chemicals: carbonic acid and sodium acetate.
Answers & Comments
Answer:
7.When a match burns, it undergoes a chemical change. Matches use sulfur, phosphate and a friction agent held together by a binding agent. With a match, heat ignites the phosphorous on the head of the match. To keep the fire going, the match needs more oxygen than is available from the air alone.
in short po is
7.heat ignites the phosphorous on the head of the match.
8The temperature of the steel wool plus hydrogen peroxide plus salt mixture increases, so the reaction is exothermic. Rusting is exothermic. It usually happens so slowly that it is not noticed.
inshort
8.so the reaction is exothermic. Rusting is exothermic
9.When the two substances are mixed together, hydrogen ions in the vinegar react with the sodium and bicarbonate ions in the baking soda. This initial reaction results in two new chemicals: carbonic acid and sodium acetate.
inshort
9.carbonic acid and sodium acetate.