Share CfE Higher Chemistry - Unit 1 Revision
Save to Folder
Which of following is not likely to have a significant effect on the rate of a reaction?
volume/mass of reactants
concentration of reactants
surface area of reactants
temperature of reactants
Which of the following is required for a successful collision?
a large surface area
a high concentration
energy lower than the activation energy
the correct geometry
A chemical reaction took 10 seconds to end. The rate of this reaction is ...
10 s<sup>-1</sup>
0.1 s<sup>-1</sup>
0.1 s
10 s
An increase in which of the following will have the largest impact on reaction rate?
surface area
pressure
concentration
temperature
A chemical reaction had a relative rate of 0.25 min-1. How long did the reaction take to end?
25 mins
0.25 mins
40 mins
4 mins
When reactants lose energy to form products, which of the following must be true?
the activation energy is very low
the reaction is endothermic
the reaction is exothermic
the activation energy is high
The activation energy for a reverse reaction is calculated from.....
the energy of the highest peak
the difference between the reactant and product energy
the difference between the reactant and highest peak energy
the difference between the product and highest peak energy
The enthalpy change for a reaction is calculated from.....
the difference between the product and highest peak energy
the energy of the highest peak
the difference between the reactant and highest peak energy
the difference between the reactant and product energy
Exothermic reactions ...
are always reversible
always have a + enthalpy change
always have a - enthalpy change
are not reversible
Which of the following is incorrect about the activation energy
it is the energy required to form the activated complex
it is lowered by the addition of a catalyst
it can sometimes be negative
it is the minimum kinetic energy needed to start a reaction
An increase in temperature ....
increases the energy released in a reaction
increases the average kinetic energy of the reactants
lowers the activation energy
increases the activation energy
The bonding and structure in the element sulphur is ....
metallic
monatomic
covalent network
covalent molecular
The bonding and structure in the element tin is ....
covalent molecular
covalent network
monatomic
metallic
The bonding and structure in the element helium is ....
metallic
covalent molecular
covalent network
monatomic
The bonding and structure in the element carbon (as graphite) is ....
covalent molecular
covalent network
monatomic
metallic
The bonding and structure in the compound silicon dioxide is ....
monatomic
metallic
covalent molecular
covalent network
