Flashcard 4 Review: Chemical Equations

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 quantities.

Front

What does it mean for a chemical equation to be balanced?

Back

A chemical equation is balanced when the number of atoms of each element is the same on both sides of the equation.

Front

How do you determine the number of hydrogen atoms in a compound?

Back

Count the number of H atoms in the chemical formula. For example, in 4H2O, there are 4 x 2 = 8 hydrogen atoms.

Front

What are reactants in a chemical reaction?

Back

Reactants are the starting substances that undergo a chemical change in a reaction.

Front

What are products in a chemical reaction?

Back

Products are the substances formed as a result of a chemical reaction.

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; it is conserved.

Front

How do you identify the coefficients in a chemical equation?

Back

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

Front

What is the significance of subscripts in a chemical formula?

Back

Subscripts indicate the number of atoms of each element in a molecule. For example, in H2O, the '2' indicates there are two hydrogen atoms.

Front

What is the balanced equation for the reaction of sodium iodide with bromine?

Back

Br2 + 2NaI → 2NaBr + I2.

Front

How do you calculate the total number of atoms in a compound?

Back

Add the number of atoms of each element in the compound. For example, in H2SO4, there are 2 H, 1 S, and 4 O, totaling 7 atoms.