C6 Flashcards
1
Q
What is a strong or weak acid?
A
When referring to an acid as strong or weak you are reffering to the proportion of the acid molecules ionise in water
2
Q
What is meant by rate of reaction?
A
It is a measure of how quickly a reaction happens
Particles must collide with enough energy in order to react
3
Q
How do you increase rate of reaction?
A
- Increase temperature-when temp is increased the particles move faster so more frequent collisions
- Increase concentration-there are more particles of reactans in the same volume making collisions more likely
- increase pressure-the particles become more crowded frequency of collisions increases
- Using a catalyst- speed up rate of reaction by decreasing the activation energy needed for the reaction to occur
4
Q
What is equillibrium?
A
- Equilibrium is when a reaction is reversible
- meaning the products can react with each other to produce the reactants
- the position of equilibrium can be on the left or the right(meaning the concentration is more on one side than the other)
5
Q
What is atom economy?
A
Tells you how much of the reactants is used up in a reaction
Atom economy=relative formula mass of desired products / relative mass of all reactants
6
Q
What is the haber process?
A
- It is used to make ammonia from hydrogen and nitrogen
- Has equillibrium
- Important because ammonia produced makes nitrogen based fertilisers- so we are able to grow the food we need to feed human
- Exothermic reaction
7
Q
What is dynamic equilibrium?
A
- Le chateliers principle-A change in one of the variables that describe a system at equilibrium produces a shift in the position of the equilibrium that counteracts the effect of this change.
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8
Q
What are NPK fertilisers?
A
- They are a fertiliser substance that is applied to soil in order to supply plants with nitrogen
- A formulated fertilisr are used nowadats but in the past used to be cow waste
- It contains nitrogen, phospurus and potassium
