Balancing Chemical Equations

What are products in a chemical equation?

• Substances that are consumed in a chemical reaction, found on the left side of the equation.

• Substances that are formed as a result of a chemical reaction, found on the right side of the equation.

• Elements that are combined to create a new substance, found in the middle of the equation.

• Reagents that are used to initiate a chemical reaction, found at the beginning of the equation.

What are reactants in a chemical equation?

• Substances produced at the end of a reaction, found on the right side of the equation.

• Starting substances in a chemical reaction, found on the left side of the equation.

• Elements that do not participate in the reaction, found in the middle of the equation.

• Catalysts that speed up the reaction, found on either side of the equation.

What is the law of conservation of mass?

• Mass can be created or destroyed in a chemical reaction.

• Mass remains constant in a closed system but can change forms.

• Mass can be converted into energy during a chemical reaction.

• Mass cannot be created or destroyed in a chemical reaction; it can only change forms.

What is the role of the arrow in a chemical equation?

• It indicates the temperature of the reaction.

• It shows the pressure conditions of the reaction.

• It indicates the direction of the reaction, separating reactants from products.

• It represents the catalyst used in the reaction.

What is the difference between a chemical equation and a word equation?

• A chemical equation uses chemical symbols to represent reactants and products, while a word equation uses the names of the substances.

• A chemical equation is always balanced, while a word equation is not.

• A chemical equation can only represent solid substances, while a word equation can represent all states of matter.

• A chemical equation uses chemical formulas to represent reactants and products, while a word equation uses the names of the substances.

What is a diatomic molecule?

• A molecule composed of two atoms of the same element, such as O2.

• A molecule composed of two atoms, which can be of the same or different elements, such as O2 or HCl.

• A molecule that contains three atoms, such as H2O.

• A molecule that is made up of only one atom, such as He.

What is a subscript in a chemical formula?

• A large number indicating the total number of atoms in a molecule.

• A small number written to the right of a chemical symbol that indicates the number of atoms of that element in a molecule.

• A symbol used to represent a chemical reaction.

• A notation that shows the charge of an atom.

What is the purpose of using parentheses in chemical formulas?

• To indicate that the enclosed atoms or groups are treated as a single unit, especially when subscripts apply to the entire group.

• To separate different elements in a formula for clarity.

• To denote the state of matter of the compound (solid, liquid, gas).

• To indicate the charge of the ions present in the formula.

What is a balanced chemical equation?

• A balanced chemical equation has equal numbers of each type of atom on both sides of the equation, indicating that mass is conserved during the reaction.

• A balanced chemical equation shows the total energy released during a reaction.

• A balanced chemical equation is one that has unequal numbers of atoms on each side of the equation.

• A balanced chemical equation is a representation of a reaction that does not follow the law of conservation of mass.

What does it mean if a chemical equation is unbalanced?

• It has equal numbers of each type of atom on both sides.

• It does not have equal numbers of each type of atom on both sides, violating the law of conservation of mass.

• It can be simplified to a more basic form.

• It indicates that a reaction has not occurred.