C6 Flashcards
What is the definition of the rate of a chemical reaction?
The rate of a chemical reaction is the speed at which reactants are converted into products.
True or False: Increasing the temperature generally increases the rate of a chemical reaction.
True
Fill in the blank: The rate of reaction can be affected by factors such as temperature, concentration, surface area, and ______.
catalysts
What effect does increasing concentration have on the rate of reaction?
Increasing concentration generally increases the rate of reaction by providing more reactant particles.
What is a catalyst?
A catalyst is a substance that increases the rate of a chemical reaction without being consumed in the process.
Which of the following factors does NOT affect the rate of a chemical reaction? A) Temperature B) Concentration C) Color of the reactants D) Surface area
C) Color of the reactants
Short answer: What is meant by ‘activation energy’?
Activation energy is the minimum energy required for a reaction to occur.
True or False: A higher surface area of solid reactants leads to a faster reaction rate.
True
What is the effect of surface area on the rate of reaction?
Increasing the surface area of solid reactants increases the rate of reaction by allowing more particles to collide.
Fill in the blank: The rate of a reaction is usually expressed as the change in ______ per unit time.
concentration
What is the relationship between temperature and kinetic energy in reactions?
As temperature increases, the kinetic energy of particles increases, leading to more frequent and effective collisions.
True or False: Increasing pressure affects the rate of reaction for gases only.
True
What is meant by the term ‘equilibrium’ in a chemical reaction?
Equilibrium is the state in which the rates of the forward and reverse reactions are equal, resulting in no net change in concentration.
What is the effect of a catalyst on activation energy?
A catalyst lowers the activation energy required for a reaction, thus speeding up the reaction rate.
Short answer: Define a reversible reaction.
A reversible reaction is a reaction that can proceed in both the forward and reverse directions.
Fill in the blank: The law of ______ states that mass is neither created nor destroyed in a chemical reaction.
conservation of mass
What is the role of temperature in endothermic and exothermic reactions?
Temperature can shift the equilibrium of endothermic or exothermic reactions, favoring the direction that absorbs or releases heat.
True or False: In a reaction, the products always have a lower energy than the reactants.
False
What is the effect of light on certain chemical reactions?
Light can provide energy that may initiate or accelerate certain chemical reactions, particularly in photochemical reactions.
What is the relationship between collision theory and reaction rate?
Collision theory states that for a reaction to occur, reactant particles must collide with sufficient energy and proper orientation.
Fill in the blank: The term ‘endothermic’ refers to reactions that ______ energy.
absorb
True or False: The concentration of reactants decreases as the reaction proceeds.
True
