Give reason why? (a) Decomposition reaction is called the opposite of
combination reaction. (b) the respiration is considered an exothermic reaction.
(c) magnesium ribbon should be cleaned before burning in air. (d) The colour of
copper sulphate solution change when iron nail is dipped in it.
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Answers
Answer:
(a) DECOMPOSITION REACTION IS CALLED OPPOSITE OF COMBINATION REACTION BECAUSE IN COMBINATION REACTION, TWO OR MORE SUBSTANCES COMBINE TO FORM A NEW SUBSTANCE WHILE IN DECOMPOSITION REACTION, ONE SUBSTANCE DECOMPOSES OR BREAKS DOWN INTO TWO OR MORE SUBSTANCES.
(b) RESPIRATION IS CALLED AN EXOTHERMIC PROCESS BECAUSE ENERGY IS RELEASED IN THIS PROCESS IN THE FORM OF ATP MOLECULES DUE TO BREAK DOWN OF GLUCOSE INTO CO2 AND WATER.
(C) MAGNESIUM RIBBON SHOULD BE CLEANED BEFORE BURNING IN AIR BECAUSE IT HAS A WHITISH OXIDE LAYER ON ITS SURFACE WHICH SLOWS DOWN OR INTERFERE IN THE BURNING PROCESS.
THAT'S WHY IT IS RUBBED WITH SANDPAPER IN ORDER TO REMOVE THE OXIDE LAYER.
(d) IT IS DUE TO OCCURRENCE OF DISPLACEMENT REACTION IN WHICH HIGHER REACTIVE ELEMENT (IRON ) DISPLACES LOWER REACTIVE ELEMENT (COPPER) FROM ITS AQUEOUS SOLUTION.
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Answer:
Explanation:
- because in a combintion reaction two or more substances are combined to form new substance while in the decomposition reaction one substance decomposes into two or more substances . Hence , the decomposition reaction are called opposite of combination reaction .
- Because energy is released in this process . Glucose combines with oxygen present in our cells to form carbon dioxide and water along with energy .
- Because the layer of magnesium oxide ( which is formed due to the reaction of magnesium with air ) can be removed in order to get the desired chemical reaction .
- when an iron nail dipped in the copper sulphate solution than iron displaces copper from the copper sulphate because iron is more reactive than copper . Therefore the colour of the copper sulphate solution changes .