Chemical Reactions and Nuclear Energy Review

Front

What is a chemical equation?

Back

A chemical equation is a symbolic representation of a chemical reaction, showing the reactants and products along with their coefficients.

Front

What does it mean to balance a chemical equation?

Back

Balancing a chemical equation means adjusting the coefficients of the reactants and products so that the number of atoms of each element is the same on both sides, reflecting the 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

How do you determine the coefficients needed to balance a chemical equation?

Back

To determine coefficients, count the number of atoms of each element in the reactants and products, and adjust the coefficients to make them equal.

Front

What is a half-life in nuclear chemistry?

Back

A half-life is the time required for half of the radioactive atoms in a sample to decay.

Front

How do you calculate the initial mass of a radioactive sample given its remaining mass and half-life?

Back

Use the formula: Initial Mass = Remaining Mass × (2^(time elapsed / half-life)).

Front

What is the significance of coefficients in a balanced chemical equation?

Back

Coefficients indicate the relative amounts of reactants and products involved in the reaction, ensuring that the equation adheres to the law of conservation of mass.

Front

What is an example of a balanced chemical equation?

Back

2H₂ + O₂ → 2H₂O is a balanced equation showing the reaction of hydrogen and oxygen to form water.

Front

What does it mean if a chemical reaction is unbalanced?

Back

An unbalanced chemical reaction means that the number of atoms of at least one element is not the same on both sides of the equation, violating the law of conservation of mass.

Front

What is the role of reactants in a chemical reaction?

Back

Reactants are the starting substances that undergo a chemical change to form products.