Final answer:
An example of no chemical reaction occurring can be observed when two substances are mixed together but do not show any change. A reaction that produces an acid can be seen when a substance reacts with water to form an acid. Similarly, a reaction that produces a base can be observed when a substance reacts with water to form a base. A reaction that uses a catalyst is when a substance is added to a reaction to speed up the reaction rate without being consumed.
Step-by-step explanation:
An example of no chemical reaction occurring can be observed when two substances are mixed together but do not show any change in color, temperature, or formation of a new substance.
A reaction that produces an acid can be seen when an acid is formed by the reaction of a substance with water. For example, when hydrogen chloride gas is dissolved in water, it forms hydrochloric acid.
A reaction that produces a base can be observed when a substance reacts with water to form a hydroxide ion. For example, when sodium hydroxide (NaOH) is dissolved in water, it forms sodium hydroxide solution, which is a strong base.
A reaction that uses a catalyst is when a substance is added to a reaction to speed up the reaction rate without being consumed. For example, the decomposition of hydrogen peroxide (H2O2) is catalyzed by the enzyme catalase.