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| 397048750 | What are the factors that affect the rate of a chemical reaction? | Temperature, pressure, concentration, use of a catalyst, state of subdivision or particle size, stirring and nature of reactants. | |
| 397048751 | What is a transition state or activated complex? | The transition state is the point in the reaction where new bonds are forming and the original bonds are breaking. It is the highest PE state for the reaction. | |
| 397048752 | Does a change in mass alone affect the rate of a chemical reaction? | No. | |
| 397048753 | What is Ea? | Ea (activation energy) is the minimum energy required for a successfully reactive collision. | |
| 397048754 | What is an exothermic reaction? | A reaction that converts PE into KE. -Temp. increases. -There is a gain in electron(s). -The energy term in the equation is on the right of the arrow. -The change in H is -ve. -Particles are closer. -Bonds are formed. | |
| 397048755 | What is enthalpy (H)? | H is stored energy or PE. | |
| 397048756 | What is an endothermic reaction? | A reaction that converts KE into PE. -Temp. decreases. -Electron(s) are given away -The energy term in the equation is on the left of the arrow. -The change in H is +ve. -Particles are further apart -Bonds are broken | |
| 397048757 | What does the term 'heat of reaction' mean? | The heat of reaction is the change in PE during a chemical reaction. It has the symbol, (delta)H. | |
| 397048758 | The Haber Process is used to manufacture ammonia: N2(g) + 3H2(g) <-> 2NH3(g) What reaction conditions should be used to maximise yield? | The forward reaction is exothermic and hence will be favoured by lower temperatures. High pressure favours the reaction as it produces the fewest moles of gas in the system. The removal of NH3 as it is forward, as this will favour the forward reaction. | |
| 397048759 | A saturated solution of strontium hydroxide containing some undissolved solid was prepared. Would this solution be in a state of equilibrium? | Yes. This is because the two opposing processes are occurring at the same rate. i.e. Some of the undissolved solid particles will be dissolving and some of the undissolved particles will become solid. |
