[C] Rates Of Reactions Flashcards
What is the definition of the rate of reaction?
The rate of reaction is the speed at which reactants are converted into products.
True or False: Increasing the temperature generally increases the rate of reaction.
True
What effect does increasing concentration have on the rate of reaction?
Increasing concentration increases the rate of reaction.
Fill in the blank: The __________ of a reaction is influenced by the surface area of solid reactants.
rate
What is the purpose of a catalyst in a chemical reaction?
A catalyst speeds up the rate of reaction without being consumed in the process.
Which of the following factors does NOT affect the rate of reaction? A) Temperature B) Pressure C) Color D) Concentration
C) Color
What is the relationship between particle size and rate of reaction?
Smaller particle size increases the rate of reaction due to a larger surface area.
True or False: A higher activation energy results in a faster reaction rate.
False
What is a common method to measure the rate of reaction?
One common method is to measure the volume of gas produced over time.
Fill in the blank: A __________ is a substance that increases the rate of a reaction without being consumed.
catalyst
What does the term ‘activation energy’ refer to?
Activation energy is the minimum energy required for a reaction to occur.
How does temperature affect particle movement?
Increasing temperature increases the energy and movement of particles.
Which of the following increases the frequency of collisions: A) Lower temperature B) Higher concentration C) Larger particle size
B) Higher concentration
What is the main purpose of the required practicals in the AQA GCSE Chemistry curriculum?
To provide hands-on experience and understanding of scientific concepts.
True or False: The rate of reaction can be expressed in terms of concentration change over time.
True
What is the effect of pressure on the rate of reaction involving gases?
Increasing pressure increases the rate of reaction by reducing the volume and increasing concentration.
What is the general effect of a catalyst on activation energy?
A catalyst lowers the activation energy required for a reaction.
Fill in the blank: The __________ of a reaction is often measured in moles per liter per second.
rate
What is an example of a reaction that can be measured by the change in color?
The reaction between sodium thiosulfate and hydrochloric acid.
True or False: The rate of reaction is constant throughout the entire reaction.
False
What is the effect of surface area on the rate of reaction?
Increased surface area increases the rate of reaction.
Which of the following is a factor affecting the rate of reaction? A) Temperature B) Light C) Sound
A) Temperature
What does the term ‘concentration’ refer to in a chemical reaction?
Concentration refers to the amount of a substance in a given volume of solution.
Fill in the blank: A __________ reaction releases energy, usually in the form of heat.
exothermic
What is the effect of a lower temperature on the rate of reaction?
A lower temperature decreases the rate of reaction.
True or False: The presence of a catalyst changes the products of a reaction.
False
What is the significance of the collision theory?
Collision theory explains how and why reactions occur based on particle collisions.
Which measurement technique is commonly used to observe gas production in a reaction?
Gas syringe or water displacement method.
Fill in the blank: The __________ of a chemical reaction can be affected by the physical state of the reactants.
rate
What type of reaction occurs when an acid reacts with a base?
Neutralization reaction.
What is the role of temperature in the kinetic theory of gases?
Temperature is a measure of the average kinetic energy of gas particles.
True or False: A faster reaction rate means that products are formed more quickly.
True
What is the effect of decreasing the concentration of reactants on the rate of reaction?
Decreasing concentration decreases the rate of reaction.
Fill in the blank: In a __________ reaction, energy is absorbed from the surroundings.
endothermic
What is the relationship between reaction rate and time?
As the reaction progresses, the rate of reaction typically decreases over time.
Which factor can be controlled to investigate the effect on the rate of reaction in a practical experiment?
Temperature, concentration, or surface area.
What is the main aim of conducting required practicals in the AQA GCSE Chemistry course?
To develop practical skills and understand scientific principles through experimentation.
True or False: The rate of reaction is independent of the nature of reactants.
False
What does the term ‘reaction mechanism’ refer to?
The step-by-step sequence of elementary reactions by which overall chemical change occurs.
Fill in the blank: __________ reactions involve the breaking of bonds in reactants and the formation of new bonds in products.
Chemical
What type of graph is often used to represent the rate of reaction over time?
A concentration vs. time graph.
