# F325

• Created by: dominika
• Created on: 31-05-15 19:27
Define rate of reaction
The change in concentration of a reactant or product per unit time
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Define order
The power to which the concentration of the reactant is raised in the rate equation
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Define rate constant
The constant that links the rate of reaction with the concentrations of reactants raised to the powers of their orders in the rate equation
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Define rate determining step
The slowest step in the reaction mechanism of a multi step reaction
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How does the half time of a first order reaction change?
It remains the same and is independent of concentration
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How can order be measured?
It can be measured using the initial rates method where you vary the concentration of one reactant and keep the other the same and then you vary the other one and keep the first one the same.
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Define conjugate acid-base pair
An acid-base pair is a pair of two species that transform into each other by gain or loss of a proton
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Define buffer solution
A buffer solution is a system that minimises pH changes on addition of small amounts of acid or alkali
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Define enthalpy change of neutralisation
The energy change that accompanies the neutralisation of an aqueous acid by an aqueous base to form one mole of H2O under standard conditions
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Define enthalpy change of solution
The enthalpy change that takes place when one mole of a compound is completely dissolved in water under standard conditions
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Define enthalpy change of hydration
The enthalpy change that takes place when one mole of isolated gaseous ions is dissolved in water forming one mole of aqueous ions, under standard conditions
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What is entropy and how does it affect the system?
ntropy is a measure of the ‘disorder’ of a system, and that a system becomes energetically more stable when it becomes more disordered
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How does a fuel cell work?
A fuel cell uses the energy from the reaction of a fuel with oxygen to create a voltage
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What can fuel cell vehicles be fuelled by?
Hydrogen gas and hydrogen rich fuels
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What are the advantages of FCVs over conventional petrol or diesel-powered vehicles?
Greater efficiency and less pollution and less CO2
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What are the limitations of hydrogen fuel cells?
Storing and transporting hydrogen in terms of safety and feasibility of a pressurised liquid and a limited life cycle of a solid absorber or adsorber. Also, HFCs have a limited lifetime and high production costs, toxic materials are used in productio
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What needs to be achieved in order to establish a hydrogen economy?
Public and political acceptance of hydrogen as a fuel, handling and maintenance of hydrogen systems, initial manufacture of hydrogen which requires energy
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Define complex ion
A transition metal ion bonded to one or more ligands by coordinate bonds
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What is cis platin?
It is an anti cancer drug which binds to DNA in cancer cells and prevents division of cancerous cells
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What is the stability constant
It is the equilibrium constant for the formation of the complex ion in a solvent from its constituent ions
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## Other cards in this set

### Card 2

Define order

#### Back

The power to which the concentration of the reactant is raised in the rate equation

### Card 3

#### Front

Define rate constant

### Card 4

#### Front

Define rate determining step

### Card 5

#### Front

How does the half time of a first order reaction change?