[C] Rates Of Reactions

Question 1

What is the definition of the rate of reaction?

Answer 1

The rate of reaction is the speed at which reactants are converted into products.

Question 2

True or False: Increasing the temperature generally increases the rate of reaction.

Answer 2

True

Question 3

What effect does increasing concentration have on the rate of reaction?

Answer 3

Increasing concentration increases the rate of reaction.

Question 4

Fill in the blank: The __________ of a reaction is influenced by the surface area of solid reactants.

Answer 4

rate

Question 5

What is the purpose of a catalyst in a chemical reaction?

Answer 5

A catalyst speeds up the rate of reaction without being consumed in the process.

Question 6

Which of the following factors does NOT affect the rate of reaction? A) Temperature B) Pressure C) Color D) Concentration

Answer 6

C) Color

Question 7

What is the relationship between particle size and rate of reaction?

Answer 7

Smaller particle size increases the rate of reaction due to a larger surface area.

Question 8

True or False: A higher activation energy results in a faster reaction rate.

Answer 8

False

Question 9

What is a common method to measure the rate of reaction?

Answer 9

One common method is to measure the volume of gas produced over time.

Question 10

Fill in the blank: A __________ is a substance that increases the rate of a reaction without being consumed.

Answer 10

catalyst

Question 11

What does the term ‘activation energy’ refer to?

Answer 11

Activation energy is the minimum energy required for a reaction to occur.

Question 12

How does temperature affect particle movement?

Answer 12

Increasing temperature increases the energy and movement of particles.

Question 13

Which of the following increases the frequency of collisions: A) Lower temperature B) Higher concentration C) Larger particle size

Answer 13

B) Higher concentration

Question 14

What is the main purpose of the required practicals in the AQA GCSE Chemistry curriculum?

Answer 14

To provide hands-on experience and understanding of scientific concepts.

Question 15

True or False: The rate of reaction can be expressed in terms of concentration change over time.

Answer 15

True

Question 16

What is the effect of pressure on the rate of reaction involving gases?

Answer 16

Increasing pressure increases the rate of reaction by reducing the volume and increasing concentration.

Question 17

What is the general effect of a catalyst on activation energy?

Answer 17

A catalyst lowers the activation energy required for a reaction.

Question 18

Fill in the blank: The __________ of a reaction is often measured in moles per liter per second.

Answer 18

rate

Question 19

What is an example of a reaction that can be measured by the change in color?

Answer 19

The reaction between sodium thiosulfate and hydrochloric acid.

Question 20

True or False: The rate of reaction is constant throughout the entire reaction.

Answer 20

False

Question 21

What is the effect of surface area on the rate of reaction?

Answer 21

Increased surface area increases the rate of reaction.

Question 22

Which of the following is a factor affecting the rate of reaction? A) Temperature B) Light C) Sound

Answer 22

A) Temperature

Question 23

What does the term ‘concentration’ refer to in a chemical reaction?

Answer 23

Concentration refers to the amount of a substance in a given volume of solution.

Question 24

Fill in the blank: A __________ reaction releases energy, usually in the form of heat.

Answer 24

exothermic

Question 25

What is the effect of a lower temperature on the rate of reaction?

Answer 25

A lower temperature decreases the rate of reaction.

Question 26

True or False: The presence of a catalyst changes the products of a reaction.

Answer 26

False

Question 27

What is the significance of the collision theory?

Answer 27

Collision theory explains how and why reactions occur based on particle collisions.

Question 28

Which measurement technique is commonly used to observe gas production in a reaction?

Answer 28

Gas syringe or water displacement method.

Question 29

Fill in the blank: The __________ of a chemical reaction can be affected by the physical state of the reactants.

Answer 29

rate

Question 30

What type of reaction occurs when an acid reacts with a base?

Answer 30

Neutralization reaction.

Question 31

What is the role of temperature in the kinetic theory of gases?

Answer 31

Temperature is a measure of the average kinetic energy of gas particles.

Question 32

True or False: A faster reaction rate means that products are formed more quickly.

Answer 32

True

Question 33

What is the effect of decreasing the concentration of reactants on the rate of reaction?

Answer 33

Decreasing concentration decreases the rate of reaction.

Question 34

Fill in the blank: In a __________ reaction, energy is absorbed from the surroundings.

Answer 34

endothermic

Question 35

What is the relationship between reaction rate and time?

Answer 35

As the reaction progresses, the rate of reaction typically decreases over time.

Question 36

Which factor can be controlled to investigate the effect on the rate of reaction in a practical experiment?

Answer 36

Temperature, concentration, or surface area.

Question 37

What is the main aim of conducting required practicals in the AQA GCSE Chemistry course?

Answer 37

To develop practical skills and understand scientific principles through experimentation.

Question 38

True or False: The rate of reaction is independent of the nature of reactants.

Answer 38

False

Question 39

What does the term 'reaction mechanism' refer to?

Answer 39

The step-by-step sequence of elementary reactions by which overall chemical change occurs.

Question 40

Fill in the blank: __________ reactions involve the breaking of bonds in reactants and the formation of new bonds in products.

Answer 40

Chemical

Question 41

What type of graph is often used to represent the rate of reaction over time?

Answer 41

A concentration vs. time graph.