6 **Chemical Reactions in Everyday Life**6) We observe several chemical reactions in everyday life. Often these reactions cause color change, temperature change, or gas production.**Which of the following case(s) is/are considered a chemical reaction? Mark all that are true.**a) Digestion of food in our body b) Process of respiration c) Burning of a candle when it is heated d) Melting of candle wax when it is heated e) Fermentation of grapes to produce wine 7) **340 grams of hydrogen peroxide (H₂O₂) is decomposed by UV treatment to water and O₂.**a) Choose a basis b) Write the chemical reaction c) Calculate the moles of decomposition products.

A chemical change is a method in which an element changes to another new compound having different chemical properties. The first option mentioned here is " digestion of food in our body". This is a chemical process because while digesting food, the food particles go through many chemical changes like converting protein to peptide and fat to glucose etc. The second option is the "process of respiration". This process undergoes a chemical reaction. Because here we take oxygen and leave carbon dioxide. So here conversion of oxygen to a new compound carbon di oxide is happening. The third option is " burning candle when it is heated". This is both physical and chemical change. It is physical when phase change is taking place from solid wax to melted wax. Here also burning of oxygen takes place. Oxygen here is converting to carbon dioxide. So, it would be considered as chemical reaction too. In the fourth option only " melting of candle is considered. It will not be a chemical reaction. "Fermentation of grapes" is a chemical reaction because here conversion of grape juice to alcohol is taking place. a) In the reaction of H2O2 , UV light will be the producer of free radical which will help the decomposition of H2O2 . b) 2H2O2 --------> 2H2O + O2 This is the chemical reaction involved. c) Moles of a compound is given by the mass divided by molar mass. Moles = massmolar mass Molar mass of H2O2 = 34 g/mol Now moles of H2O2 = 34034 =10 mole From the chemical equation's stoichiometry, it is clear that 2 moles of H2O2 will give 2 moles of H2O and 1 mole of O2 . Ratio of H2O2 : H2O: O2 = 2: 2: 1 So, 340 g of H2O2 is 10 moles of H2O2. H2O2 : H2O: O2 = 2: 2: 1 Multiplied by 5 we have, H2O2 : H2O: O2 = 10 : 10: 5 So, 10 moles of 340 g of H2O2 will produce 10 moles of H2O and 5 moles of O2.

Science

Chemistry

6) We observe several chemical reactions in everyday life. Often these reactions cause color change, temperature change or gas production. hich of the following case(s) is/are considered a chemical reaction? ark all that true. O Digestion of food in our body O Process of respiration Burning of candle when it is heated O Melting of candle wax when it is heated O Fermentation of grapes to produce wine 7) 340 grams of hydrogen peroxide (H₂O2) is decomposed by UV treatment to water and 0₂. a) Choose a basis b) Write the chemical reaction c) Calculate the moles of decomposition products.

6) We observe several chemical reactions in everyday life. Often these reactions cause color change, temperature change or gas production. hich of the following case(s) is/are considered a chemical reaction? ark all that true. O Digestion of food in our body O Process of respiration Burning of candle when it is heated O Melting of candle wax when it is heated O Fermentation of grapes to produce wine 7) 340 grams of hydrogen peroxide (H₂O2) is decomposed by UV treatment to water and 0₂. a) Choose a basis b) Write the chemical reaction c) Calculate the moles of decomposition products.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Concept explainers

Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".

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**Chemical Reactions in Everyday Life**

6) We observe several chemical reactions in everyday life. Often these reactions cause color change, temperature change, or gas production.

**Which of the following case(s) is/are considered a chemical reaction? Mark all that are true.**

a) Digestion of food in our body
b) Process of respiration
c) Burning of a candle when it is heated
d) Melting of candle wax when it is heated
e) Fermentation of grapes to produce wine

7) **340 grams of hydrogen peroxide (H₂O₂) is decomposed by UV treatment to water and O₂.**

a) Choose a basis
b) Write the chemical reaction
c) Calculate the moles of decomposition products.

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