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Questions and Answers
What is the main reason for balancing a chemical equation?
What is the main reason for balancing a chemical equation?
- To study the properties of elements
- To follow the law of multiple proportions
- To satisfy the law of conservation of mass (correct)
- To obey the law of definite proportions
What type of chemical equation is Equation (1.2) according to the text?
What type of chemical equation is Equation (1.2) according to the text?
- A chemical reaction
- A skeletal chemical equation (correct)
- A balanced chemical equation
- A word-equation
What is the purpose of drawing boxes around each formula in a chemical equation?
What is the purpose of drawing boxes around each formula in a chemical equation?
- To satisfy the law of conservation of mass
- To balance the chemical equation (correct)
- To write the word-equation
- To identify the reactants and products
Which element has the same number of atoms on both sides of the arrow in Equation (1.3)?
Which element has the same number of atoms on both sides of the arrow in Equation (1.3)?
What is the result of not balancing a chemical equation?
What is the result of not balancing a chemical equation?
What is the purpose of balancing a chemical equation?
What is the purpose of balancing a chemical equation?
What is the characteristic of a balanced chemical equation?
What is the characteristic of a balanced chemical equation?
What is the difference between a word-equation and a chemical equation?
What is the difference between a word-equation and a chemical equation?
What is the purpose of rubbing the iron nails with sandpaper in Activity 1.9?
What is the purpose of rubbing the iron nails with sandpaper in Activity 1.9?
What is the function of the thread in Activity 1.9?
What is the function of the thread in Activity 1.9?
What is observed in the copper sulphate solution in test tube B after 20 minutes?
What is observed in the copper sulphate solution in test tube B after 20 minutes?
What is the purpose of keeping one iron nail aside in Activity 1.9?
What is the purpose of keeping one iron nail aside in Activity 1.9?
What is the duration of time for which the iron nails are immersed in the copper sulphate solution in test tube B?
What is the duration of time for which the iron nails are immersed in the copper sulphate solution in test tube B?
What is the volume of the copper sulphate solution taken in each test tube?
What is the volume of the copper sulphate solution taken in each test tube?
What is compared in the copper sulphate solutions in test tubes A and B?
What is compared in the copper sulphate solutions in test tubes A and B?
What is the name of the reaction that occurs in Activity 1.9?
What is the name of the reaction that occurs in Activity 1.9?
What is the end result of burning a magnesium ribbon in air?
What is the end result of burning a magnesium ribbon in air?
What is the purpose of wearing eye protection in Activity 1.1?
What is the purpose of wearing eye protection in Activity 1.1?
What is the primary reason for cleaning the magnesium ribbon with sandpaper?
What is the primary reason for cleaning the magnesium ribbon with sandpaper?
What is a common characteristic of all the situations mentioned in the introduction?
What is a common characteristic of all the situations mentioned in the introduction?
What is the term used to describe the process of milk turning sour when left at room temperature during summers?
What is the term used to describe the process of milk turning sour when left at room temperature during summers?
What is the purpose of collecting the ash in a watch-glass in Activity 1.1?
What is the purpose of collecting the ash in a watch-glass in Activity 1.1?
What is the term used to describe the process of grapes turning into wine?
What is the term used to describe the process of grapes turning into wine?
Why is it necessary to perform Activity 1.1 under the teacher's supervision?
Why is it necessary to perform Activity 1.1 under the teacher's supervision?
What is the result of oxidation of copper?
What is the result of oxidation of copper?
What happens to the copper(II) oxide during the reaction with hydrogen gas?
What happens to the copper(II) oxide during the reaction with hydrogen gas?
What is the definition of oxidation?
What is the definition of oxidation?
In reaction (1.31), what is the product of the oxidation of carbon?
In reaction (1.31), what is the product of the oxidation of carbon?
What is the type of reaction that occurs between copper oxide and hydrogen gas?
What is the type of reaction that occurs between copper oxide and hydrogen gas?
What is the result of the reduction of zinc oxide?
What is the result of the reduction of zinc oxide?
What happens to the hydrogen during the reaction with copper oxide?
What happens to the hydrogen during the reaction with copper oxide?
What is the definition of reduction?
What is the definition of reduction?
In the reaction 2Fe2O3 + 2Al → Al2O3 + 2Fe, which of the following is true?
In the reaction 2Fe2O3 + 2Al → Al2O3 + 2Fe, which of the following is true?
What is the result of adding dilute hydrochloric acid to iron fillings?
What is the result of adding dilute hydrochloric acid to iron fillings?
What is the purpose of a balanced chemical equation?
What is the purpose of a balanced chemical equation?
What is the correct balanced equation for the reaction of hydrogen gas with nitrogen to form ammonia?
What is the correct balanced equation for the reaction of hydrogen gas with nitrogen to form ammonia?
What is the type of reaction that occurs between barium chloride and aluminium sulphate?
What is the type of reaction that occurs between barium chloride and aluminium sulphate?
What is the correct balanced equation for the reaction of calcium hydroxide with carbon dioxide to form calcium carbonate and water?
What is the correct balanced equation for the reaction of calcium hydroxide with carbon dioxide to form calcium carbonate and water?
What is the type of reaction that occurs between zinc and silver nitrate?
What is the type of reaction that occurs between zinc and silver nitrate?
What is the correct balanced equation for the reaction of barium chloride with potassium sulphate to form barium sulphate and potassium chloride?
What is the correct balanced equation for the reaction of barium chloride with potassium sulphate to form barium sulphate and potassium chloride?
Study Notes
Chemical Reactions and Equations
- Chemical reactions involve a change in the nature and identity of the initial substance, resulting in a new product.
- Examples of chemical reactions in daily life include:
- Milk spoiling when left at room temperature
- Iron rusting when exposed to humid air
- Grapes fermenting
- Food cooking
- Digestion of food in the body
- Respiration
Chemical Equations
- A chemical equation is a representation of a chemical reaction using symbols and formulas.
- A skeletal chemical equation is a basic representation of a chemical reaction that may not be balanced.
- The law of conservation of mass states that mass cannot be created or destroyed in a chemical reaction, so the total mass of elements in the reactants must equal the total mass of elements in the products.
- A balanced chemical equation is one in which the number of atoms of each element is the same on both sides of the equation.
Balancing Chemical Equations
- To balance a chemical equation, first draw boxes around each formula.
- Count the number of atoms of each element on both sides of the equation and adjust the coefficients as necessary to make the equation balanced.
Types of Chemical Reactions
- Displacement reactions: a more reactive element displaces a less reactive element from a compound.
- Oxidation-reduction reactions (redox reactions): one reactant is oxidized (loses electrons) while the other is reduced (gains electrons).
- Examples of redox reactions include:
- CuO + H2 → Cu + H2O
- ZnO + C → Zn + CO
- MnO2 + 4HCl → MnCl2 + 2H2O + Cl2
Characteristics of Chemical Reactions
- If a substance gains oxygen during a reaction, it is said to be oxidized.
- If a substance loses oxygen during a reaction, it is said to be reduced.
- Oxidation and reduction occur simultaneously in a redox reaction.
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Description
Explore the concept of chemical reactions and equations through everyday life scenarios, such as milk spoilage, iron rusting, fermentation, cooking, and digestion. Test your understanding of these chemical reactions and equations in this quiz.
