Chemical Kinetics Reaction Rates! Trivia Quiz

A catalyst is a substance that initiates or accelerates a chemical reaction without itself being affected. It works by providing an alternative pathway for the reaction to occur, lowering the activation energy required for the reaction to proceed. This allows the reaction to happen at a faster rate and with less energy input. The catalyst itself remains unchanged at the end of the reaction, making it available for use in subsequent reactions.

Activation energy is the amount of energy required for a reaction to occur. It is the minimum energy needed for reactant molecules to overcome the energy barrier and initiate the reaction. Without this energy, the reaction cannot proceed. The term "head start energy" and "startup energy" are not commonly used in chemistry to describe the energy required for a reaction. Therefore, the correct answer is activation energy.

An exothermic reaction is a chemical reaction that releases energy in the form of heat. In this type of reaction, the products have less energy than the reactants, resulting in the release of excess energy in the form of heat. This can often be observed as an increase in temperature in the surroundings.

An endothermic reaction is a type of chemical reaction that absorbs energy in the form of heat from its surroundings. In this reaction, the products have higher energy than the reactants, and the overall change in energy is positive. This means that heat is being taken in or absorbed during the reaction. The opposite of an endothermic reaction is an exothermic reaction, where heat is released.

The correct answer is Collision theory. This theory explains that atoms, ions, and molecules can react to form products when they collide, as long as they have enough kinetic energy. It emphasizes the importance of collisions between particles in chemical reactions and how energy transfer during these collisions determines whether a reaction will occur.

The correct answer is Reaction Rates because the question is asking for the term that represents the rate of change of concentration over time. Reaction rates refer to the speed at which a chemical reaction occurs, specifically the change in concentration of reactants or products per unit of time. Therefore, it is the most appropriate term to describe the given concept.

A closed system is a system in which no matter is allowed to enter or leave. This means that the system is isolated from its surroundings and there is no exchange of matter with the external environment. In a closed system, the total amount of matter remains constant, although energy can still be exchanged with the surroundings. This concept is often used in thermodynamics to analyze the behavior of physical systems.

Preservatives cannot affect the rate of reaction because they are substances added to products to prevent spoilage or decay. They do not participate in the chemical reaction itself and do not alter the reaction rate. Temperature, catalysts, and the nature of reactants, on the other hand, can all significantly impact the rate of a chemical reaction. Temperature affects the kinetic energy of particles, catalysts provide an alternative reaction pathway with lower activation energy, and the nature of reactants determines the ease with which they can react.

An open system is a system in which both energy and matter can be exchanged with the surroundings. In an open system, there is a continuous flow of energy and matter between the system and its surroundings, allowing for interactions and exchanges to occur. This is in contrast to a closed system, where only energy can be exchanged, and a isolated system, where neither energy nor matter can be exchanged.

Fewer ionic bonds react faster because ionic bonds are relatively stronger compared to other types of bonds. When there are fewer ionic bonds present, it means there are more opportunities for other types of bonds, such as covalent bonds, to form. Covalent bonds are generally weaker and more reactive than ionic bonds. Therefore, a system with fewer ionic bonds will have a faster reaction rate.