7th Grade Balancing Equations Flashcard

Front

What is a reactant in a chemical equation?

Back

A reactant is a substance that undergoes a chemical change in a reaction, found on the left side of the equation.

Front

What is a product in a chemical equation?

Back

A product is a substance that is formed as a result of a chemical reaction, found on the right side of the equation.

Front

What is a coefficient in a chemical equation?

Back

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

Front

What is a subscript in a chemical formula?

Back

A subscript is a small number written to the right of an element symbol that indicates 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.

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 many oxygen atoms are in 2H2O?

Back

There are 2 oxygen atoms in 2H2O.

Front

What is the balanced equation for the combustion of methane (CH4)?

Back

The balanced equation is CH4 + 2O2 → CO2 + 2H2O.

Front

How many hydrogen atoms are in 3H2O?

Back

There are 6 hydrogen atoms in 3H2O.

Front

What is the balanced equation for the reaction of magnesium and hydrochloric acid?

Back

The balanced equation is Mg + 2HCl → MgCl2 + H2.