GEN Balancing Equations Flashcard Review

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that in a chemical reaction, the total mass of the reactants is equal to the total mass of the products.

Front

What are coefficients in a chemical equation?

Back

Coefficients are the numbers placed before the compounds in a chemical equation to indicate the number of molecules or moles of each substance involved in the reaction.

Front

What are subscripts in a chemical formula?

Back

Subscripts are the small numbers written to the lower right of an element symbol in a chemical formula that indicate the number of atoms of that element in a molecule.

Front

How do you balance a chemical equation?

Back

To balance a chemical equation, adjust the coefficients of the reactants and products to ensure that the number of atoms of each element is the same on both sides of the equation.

Front

What is the balanced equation for the reaction of PCl₅ and H₂O?

Back

4 PCl₅ + 5 H₂O → 4 HCl + H₃PO₄.

Front

How many hydrogen atoms are in 3(NH₄)₂CrO₄?

Back

There are 24 hydrogen atoms in 3(NH₄)₂CrO₄.

Front

What does it mean if a chemical equation is not balanced?

Back

If a chemical equation is not balanced, it means that the law of conservation of mass is violated, indicating that the number of atoms of at least one element is not the same on both sides of the equation.

Front

What is the significance of balancing chemical equations?

Back

Balancing chemical equations is important because it reflects the conservation of mass and allows chemists to predict the amounts of reactants and products involved in a reaction.

Front

What is the balanced equation for the reaction of SO₂ and Li₂Se?

Back

1 SO₂ + 2 Li₂Se → 1 SSe₂ + 2 Li₂O.

Front

What is the difference between a reactant and a product?

Back

Reactants are the starting substances in a chemical reaction, while products are the substances formed as a result of the reaction.