Rates of Reaction Flashcards
What is an example of a very slow reaction?
The rusting of iron
What is an example of a moderate reaction?
Metal reacting with acid to produce bubbles
What is an example of a very fast reaction?
An explosion
What does the rate of reaction depend on?
- temperature
- concentration
- catalyst
- surface area of solids
How can you calculate the rate of reaction?
Amount of reactant used or amount of product formed / time
How else could the rate of reaction be measured? 1
Precipitation- observe a mark through solution and measure how long it takes for it to disappear, the quicker the mark disappears, the quicker the reaction
How else can rate of reaction be measured? 2
Change in mass - usually gas given off
The quicker the reading on the balance drops the faster the reaction
How else can rate of reaction be measured? 3
The volume of gas given off - the more gas given off in the gas syringe during each time interval, the faster reaction
What is meant by the collision theory?
When reacting particles collide with enough energy for a reaction to take place
What increases collisions?
- higher temperature
- higher concentration
- larger surface area
- catalyst
Why is there more collisions with a higher temperature?
The particles have more thermal energy which transfers into kinetic energy, therefore they move about more, therefore more likely to collide
How does a higher concentration increase collisions?
There are more particles to bump into each other
How does a larger surface area increase collisions?
More particles and more space for them to move around - more collisions
What is a catalyst?
A substance which speeds up a reaction without being changed or used up
What is an exothermic reaction?
One that releases energy to its surroundings
