PS8.1.5 VOCAB

Which of the following best describes a chemical equation?

• A description of the physical properties of substances involved in a reaction

• A symbolic representation of a chemical reaction using element symbols and formulas

• A written list of the products of a chemical reaction

• A list of the conditions required for a chemical reaction to occur

What does a coefficient in a chemical equation indicate?

• The type of chemical reaction

• The number of molecules of a substance in the reaction

• The atomic mass of an element

• The type of bonding in the reactants

True or False: A subscript in a chemical formula indicates the number of atoms of an element in a molecule.

What does the yield arrow (→) in a chemical equation represent?

• The reactants of the chemical reaction

• The direction of the chemical reaction

• The products of the chemical reaction

• The catalyst used in the reaction

True or False: The Law of Conservation of Mass states that matter is neither created nor destroyed in a chemical reaction.

Which of the following are products in a chemical reaction?

• The starting substances in the reaction

• The substances formed as a result of the reaction

• The coefficients used in the equation

• The catalysts involved in the reaction

What are reactants in a chemical reaction?

• The substances formed by the chemical reaction

• The elements that are rearranged during the reaction

• The starting substances in the reaction

• The arrow that shows the direction of the reaction

True or False: In an open system, matter can enter or escape during a reaction.

Which of the following best describes a closed system?

• A system where matter can enter or leave during a reaction

• A system where matter cannot enter or leave during a reaction

• A system where only energy can enter or leave during a reaction

• A system that involves only solid substances