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Questions and Answers
What does the law of conservation of mass state in relation to chemical reactions?
What does the law of conservation of mass state in relation to chemical reactions?
- The total mass of the elements in the products is equal to the total mass of the elements in the reactants (correct)
- Mass can be created in a chemical reaction
- Mass can be destroyed in a chemical reaction
- The number of atoms of each element changes before and after a chemical reaction
What does it mean for a chemical equation to be balanced?
What does it mean for a chemical equation to be balanced?
- It means the total mass on both sides of the equation is different
- It means there are more atoms in the reactants than in the products
- The number of atoms of each element remains the same before and after a chemical reaction (correct)
- It means there are fewer atoms in the reactants than in the products
What is a skeletal chemical equation?
What is a skeletal chemical equation?
- An equation with incorrect symbols for elements
- An equation without balanced elements on both sides (correct)
- A balanced equation representing a chemical reaction
- A chemical equation without any reactants or products
Why is it important to balance a chemical equation?
Why is it important to balance a chemical equation?
What does the word-equation 'Zinc + Sulphuric acid → Zinc sulphate + Hydrogen' represent?
What does the word-equation 'Zinc + Sulphuric acid → Zinc sulphate + Hydrogen' represent?
What is the simplest way to represent the chemical reaction involving the burning of a magnesium ribbon in oxygen?
What is the simplest way to represent the chemical reaction involving the burning of a magnesium ribbon in oxygen?
In a word-equation for a chemical reaction, where are the reactants and products written?
In a word-equation for a chemical reaction, where are the reactants and products written?
What does the arrow in a chemical equation indicate?
What does the arrow in a chemical equation indicate?
How can chemical equations be made more concise and useful?
How can chemical equations be made more concise and useful?
What should be done to compare the number of atoms of each element on both sides of a chemical equation?
What should be done to compare the number of atoms of each element on both sides of a chemical equation?
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Study Notes
Chemical Reactions and Equations
- The law of conservation of mass states that matter cannot be created or destroyed in a chemical reaction, only transformed from one substance to another.
Balancing Chemical Equations
- A balanced chemical equation is one in which the number of atoms of each element is the same on both the reactant and product sides.
- A skeletal chemical equation is a chemical equation that has not been balanced, meaning the number of atoms of each element is not the same on both sides.
Importance of Balancing
- It is important to balance a chemical equation to ensure that the law of conservation of mass is upheld and to accurately represent the reaction.
Representing Chemical Reactions
- A word-equation represents a chemical reaction using words, such as "Zinc + Sulphuric acid → Zinc sulphate + Hydrogen".
- The simplest way to represent the chemical reaction involving the burning of a magnesium ribbon in oxygen is "2Mg + O2 → 2MgO".
Chemical Equation Structure
- In a word-equation, reactants are written on the left and products are written on the right.
- The arrow in a chemical equation indicates the direction of the reaction, with reactants on the left and products on the right.
Refining Chemical Equations
- Chemical equations can be made more concise and useful by using symbols and formulas instead of words.
- To ensure a balanced equation, the number of atoms of each element should be compared on both sides of the equation and adjusted accordingly.
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