Law of Conservation of Mass

Front

What is the Law of Conservation of Mass?

Back

The Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction. The total mass of reactants equals the total mass of products.

Front

What is a balanced chemical equation?

Back

A balanced chemical equation has the same number of each type of atom on both sides of the equation, ensuring that mass is conserved.

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What is a subscript in a chemical formula?

Back

A subscript is a number written below and to the right of a chemical symbol that indicates the number of atoms of that element in a molecule.

Front

What is a coefficient in a chemical equation?

Back

A coefficient is a number placed in front of a chemical formula in an equation to indicate how many molecules or moles of that substance are involved.

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If reactant A has 5g and product C has 9g, how many grams does reactant B have?

Back

4g

Front

If Bob puts 200 grams of ice into 900 grams of water, how much total mass is in the pitcher after the ice melts?

Back

1,100 g

Front

In the reaction AB -> A + B, if AB has 12g and B has 5g, how much does A weigh?

Back

7g

Front

What does it mean for a chemical reaction to be 'closed'?

Back

A closed chemical reaction is one where no matter enters or leaves the system, allowing for accurate measurement of mass.

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What is the difference between reactants and products in a chemical reaction?

Back

Reactants are substances that undergo a chemical change, while products are the substances formed as a result of that change.

Front

How can you tell if a chemical equation is balanced?

Back

You can tell if a chemical equation is balanced by counting the number of atoms of each element on both sides of the equation.