Science TEKS 8.6B & 8.6E

Front

What is the law of conservation of matter?

Back

The law of conservation of matter states that matter cannot be created or destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.

Front

What are reactants in a chemical equation?

Back

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

Front

How do you count atoms in a molecule?

Back

To count atoms in a molecule, multiply the subscript of each element by the coefficient in front of the molecule, if present.

Front

What is a balanced chemical equation?

Back

A balanced chemical equation has the same number of each type of atom on both sides of the equation, demonstrating the conservation of mass.

Front

What is the significance of coefficients in a chemical equation?

Back

Coefficients indicate the number of molecules or moles of a substance involved in a reaction.

Front

How many hydrogen and oxygen atoms are in 2H₂O₂?

Back

There are 4 hydrogen atoms and 2 oxygen atoms in 2H₂O₂.

Front

What is the product of the reaction CH₄ + O₂?

Back

The products of the reaction CH₄ + O₂ are CO₂ and H₂O.

Front

What is the total mass of products if 25 g of solid is mixed with 60 g of solution?

Back

The total mass of products is 85 g.

Front

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

Back

An unbalanced chemical equation has different numbers of atoms of one or more elements on each side, violating the law of conservation of matter.

Front

What is the role of oxygen in combustion reactions?

Back

Oxygen acts as a reactant that combines with a fuel to produce energy, carbon dioxide, and water.