Chemical Equations and Formulae

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What is the purpose of using chemical formulae instead of words in a chemical equation?

To make the equation longer and less useful

To make the equation more concise and useful (correct)

To make the equation harder to understand

To make the equation less accurate

What does the law of conservation of mass state?

The number of atoms of each element changes before and after a chemical reaction

Mass can be created in a chemical reaction

Mass can be destroyed in a chemical reaction

The total mass of the elements present in the products must be equal to the total mass of the reactants (correct)

Why do we need to balance a skeletal chemical equation?

To ensure that the number of atoms of each element remains the same before and after a chemical reaction (correct)

To violate the law of conservation of mass

To create more confusion

To make the equation longer

How can you determine if a chemical equation is balanced?

By comparing the number of atoms of each element on both sides of the arrow Signup and view all the answers

What does a balanced chemical equation ensure about the number of atoms of each element?

It ensures that the number of atoms remains the same before and after a chemical reaction Signup and view all the answers

What is represented by 'Mg' in a chemical equation?

Magnesium Signup and view all the answers

What is represented by 'O' in a chemical equation?

Oxygen atom Signup and view all the answers

What does 'MgO' represent in a chemical equation?

Magnesium oxide Signup and view all the answers

What happens if the mass is not the same on both sides of a chemical equation?

The equation is unbalanced because mass must be equal on both sides Signup and view all the answers

What word-equation can be represented as Mg + O -> MgO?

Magnesium + Oxygen -> Magnesium Oxide Signup and view all the answers

Chemical Equations and Formulae

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Questions and Answers

What is the purpose of using chemical formulae instead of words in a chemical equation?

What does the law of conservation of mass state?

Why do we need to balance a skeletal chemical equation?

How can you determine if a chemical equation is balanced?

What does a balanced chemical equation ensure about the number of atoms of each element?

What is represented by 'Mg' in a chemical equation?

What is represented by 'O' in a chemical equation?

What does 'MgO' represent in a chemical equation?

What happens if the mass is not the same on both sides of a chemical equation?

What word-equation can be represented as Mg + O -> MgO?

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