2nd - Counting Atoms, Classifying and Balancing Equations

Front

What is the balanced equation for the reaction of hydrogen and chlorine to form hydrochloric acid?

Back

H₂ + Cl₂ → 2HCl

Front

What are the reactants in the chemical equation 2H₂ + O₂ → 2H₂O?

Back

Reactants are the substances that undergo a chemical change, in this case, 2H₂ and O₂.

Front

How many hydrogen atoms are present in the compound 4H₂O?

Back

8 hydrogen atoms.

Front

How many oxygen atoms are in the compound 2SO₄?

Back

8 oxygen atoms.

Front

Balance the equation: ____ CH₄ + ____ O₂ → ____ CO₂ + ____ H₂O. What are the coefficients?

Back

1, 2, 1, 2.

Front

What is the right part of a chemical equation called?

Back

Products.

Front

Define a chemical equation.

Back

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

Front

What is the law of conservation of mass?

Back

The law states that mass is neither created nor destroyed in a chemical reaction.

Front

What is a coefficient in a chemical equation?

Back

A coefficient is a number placed in front of a chemical formula to indicate the number of molecules or moles of that substance.

Front

What does it mean to balance a chemical equation?

Back

Balancing a chemical equation means ensuring that the number of atoms for each element is the same on both sides of the equation.