Gr 9 NATURAL SCIENCES: CH 2.2 Balanced equations

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What is the first step to balance the equation Mg + O2 → MgO?

Change the subscripts of Mg and O

Add O2 to the product side

Add a coefficient of 2 to MgO (correct)

Change the coefficient of Mg to 2

What is a crucial rule to follow when balancing equations?

Modify the given reactants and products

Change only the coefficients of chemical formulas (correct)

Change the subscripts of chemical formulas

Add or remove reactants or products

What is the purpose of balancing an equation?

To make the equation look visually appealing

To modify the subscripts of chemical formulas

To ensure the same number of atoms of each element on both sides (correct)

To change the reactants and products

In the balanced equation CH4 + 2O2 → CO2 + 2H2O, what is the coefficient of O2?

2 Signup and view all the answers

In the balanced equation 2H2 + O2 → 2H2O, what is the coefficient of H2?

2 Signup and view all the answers

What should not be changed when balancing an equation?

Subscripts of chemical formulas Signup and view all the answers

Why is it important to balance an equation?

To satisfy the law of conservation of mass Signup and view all the answers

What is the result of balancing an equation?

The same number of atoms of each element on both sides Signup and view all the answers

What does a balanced equation represent in chemistry?

The law of conservation of mass Signup and view all the answers

What is the term for a representation of a substance using symbols for its constituent elements?

Chemical formula Signup and view all the answers

What is the process of counting atoms on both sides of a chemical equation to ensure they are equal?

Counting the atoms Signup and view all the answers

What happens when a metal reacts with oxygen or sulfur?

It becomes tarnish Signup and view all the answers

What is the correct statement about the equation 2H₂ + O₂ → 2H₂O?

It is a balanced equation Signup and view all the answers

What is the first step in balancing a chemical equation?

Counting the atoms on both sides of the equation Signup and view all the answers

What is the definition of a balanced equation?

An equation where the number and type of atoms are the same on both sides Signup and view all the answers

What is the primary reason for balancing chemical equations?

To ensure the same number of atoms of each element on both sides of the equation Signup and view all the answers

What is the term for the dulling or discoloration of metal due to a chemical reaction?

Tarnish Signup and view all the answers

In the balanced equation 2H₂ + O₂ → 2H₂O, what is the number of oxygen atoms on the left side of the equation?

2 Signup and view all the answers

What is the result of balancing the equation Mg + O₂ → MgO?

The number and type of atoms are the same on both sides of the equation Signup and view all the answers

What is the term for iron oxide, formed by the reaction of iron and oxygen?

Rust Signup and view all the answers

What is the first step in balancing the equation Mg + O₂ → MgO?

Counting the atoms on both sides of the equation Signup and view all the answers

What is a characteristic of a balanced equation?

The number and type of atoms are the same on both sides of the equation Signup and view all the answers

When balancing an equation, what is the primary goal?

To ensure the number of atoms of each element is equal on both sides Signup and view all the answers

In the combustion of methane, what is the coefficient of O2 in the balanced equation?

2 Signup and view all the answers

What is the result of balancing the equation H2 + O2 → H2O?

2H2 + O2 → 2H2O Signup and view all the answers

What should be modified to balance an equation?

The coefficients in front of the chemical formulas Signup and view all the answers

In the equation 2Mg + O2 → 2MgO, what is the coefficient of Mg?

2 Signup and view all the answers

What is the purpose of using coefficients in balancing an equation?

To ensure the number of atoms of each element is equal on both sides Signup and view all the answers

What is the correct sequence of steps to balance an equation?

Modify the coefficients only Signup and view all the answers

What is the significance of a balanced equation in chemistry?

It represents the correct ratio of reactants and products Signup and view all the answers

Which of the following is a necessary condition for a chemical equation to be balanced?

The number of atoms of each element is equal on both sides of the equation. Signup and view all the answers

What is the primary reason for ensuring that a chemical equation is balanced?

To ensure that the law of conservation of mass is obeyed. Signup and view all the answers

In a balanced equation, what is the relationship between the number of atoms of each element on the reactant and product sides?

The number of atoms of each element is equal on both sides. Signup and view all the answers

What is the purpose of counting the atoms of each element on both sides of a chemical equation?

To ensure that the equation is balanced. Signup and view all the answers

Which of the following statements is true about a balanced equation?

The equation represents the conservation of mass. Signup and view all the answers

What is the result of balancing a chemical equation?

The number of atoms of each element is equal on both sides of the equation. Signup and view all the answers

Which of the following is an example of a chemical reaction that involves the tarnishing of a metal?

The rusting of iron. Signup and view all the answers

What is the primary reason for modifying the coefficients of reactants or products in a chemical equation?

To ensure the equation is balanced Signup and view all the answers

Which of the following is a correct statement about balancing a chemical equation?

Coefficients can be added to or modified to balance the equation Signup and view all the answers

What is a common mistake to avoid when balancing a chemical equation?

Changing the subscripts of reactants Signup and view all the answers

In the balanced equation CH₄ + 2O₂ → CO₂ + 2H₂O, what is the significance of the coefficient 2 in front of O₂?

It indicates the number of oxygen atoms required to balance the equation Signup and view all the answers

What is the primary goal of balancing a chemical equation?

To ensure the number of atoms of each element is equal on both sides Signup and view all the answers

In the balanced equation 2H₂ + O₂ → 2H₂O, what is the significance of the coefficient 2 in front of H₂?

It indicates the number of hydrogen atoms required to balance the equation Signup and view all the answers

What is the result of balancing the equation Mg + O₂ → MgO?

The coefficients of the reactants are modified Signup and view all the answers

What is the correct sequence of steps to balance a chemical equation?

Modify the coefficients, without changing the subscripts or adding/removing reactants/products Signup and view all the answers

Gr 9 NATURAL SCIENCES: CH 2.2 Balanced equations

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Questions and Answers

What is the first step to balance the equation Mg + O2 → MgO?

What is a crucial rule to follow when balancing equations?

What is the purpose of balancing an equation?

In the balanced equation CH4 + 2O2 → CO2 + 2H2O, what is the coefficient of O2?

In the balanced equation 2H2 + O2 → 2H2O, what is the coefficient of H2?

What should not be changed when balancing an equation?

Why is it important to balance an equation?

What is the result of balancing an equation?

What does a balanced equation represent in chemistry?

What is the term for a representation of a substance using symbols for its constituent elements?

What is the process of counting atoms on both sides of a chemical equation to ensure they are equal?

What happens when a metal reacts with oxygen or sulfur?

What is the correct statement about the equation 2H₂ + O₂ → 2H₂O?

What is the first step in balancing a chemical equation?

What is the definition of a balanced equation?

What is the primary reason for balancing chemical equations?

What is the term for the dulling or discoloration of metal due to a chemical reaction?

In the balanced equation 2H₂ + O₂ → 2H₂O, what is the number of oxygen atoms on the left side of the equation?

What is the result of balancing the equation Mg + O₂ → MgO?

What is the term for iron oxide, formed by the reaction of iron and oxygen?

What is the first step in balancing the equation Mg + O₂ → MgO?

What is a characteristic of a balanced equation?

When balancing an equation, what is the primary goal?

In the combustion of methane, what is the coefficient of O2 in the balanced equation?

What is the result of balancing the equation H2 + O2 → H2O?

What should be modified to balance an equation?

In the equation 2Mg + O2 → 2MgO, what is the coefficient of Mg?

What is the purpose of using coefficients in balancing an equation?

What is the correct sequence of steps to balance an equation?

What is the significance of a balanced equation in chemistry?

Which of the following is a necessary condition for a chemical equation to be balanced?

What is the primary reason for ensuring that a chemical equation is balanced?

In a balanced equation, what is the relationship between the number of atoms of each element on the reactant and product sides?

What is the purpose of counting the atoms of each element on both sides of a chemical equation?

Which of the following statements is true about a balanced equation?

What is the result of balancing a chemical equation?

Which of the following is an example of a chemical reaction that involves the tarnishing of a metal?

What is the primary reason for modifying the coefficients of reactants or products in a chemical equation?

Which of the following is a correct statement about balancing a chemical equation?

What is a common mistake to avoid when balancing a chemical equation?

In the balanced equation CH₄ + 2O₂ → CO₂ + 2H₂O, what is the significance of the coefficient 2 in front of O₂?

What is the primary goal of balancing a chemical equation?

In the balanced equation 2H₂ + O₂ → 2H₂O, what is the significance of the coefficient 2 in front of H₂?

What is the result of balancing the equation Mg + O₂ → MgO?

What is the correct sequence of steps to balance a chemical equation?

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