rate of reactions (3) Flashcards
what is wrong with a combustible product?``
it can cause explosions
what does breaking up a block into smaller pieces increase?
the surface area of the block
why can collisions only occur with the particles on the surface?
because most particles inside the block are trapped, so they are not available to react
what does a catalyst do?
changes the rate of reaction but is unchanged at the end of a reaction
each catalyst is specific…
to a reaction
what is an example of a class experiment that tests for hydrogen gas?
the squeaky pop reaction
name 3 things that are flammable if they spread out into air and catch fire?
flour, custard and sulfur
what is a catalyst?
a substance added to a chemical reaction to make it go faster
what does a catalyst not do?
change how much of the product is made
name 3 properties of a catalyst?
it is unchanged at the end of the reaction
only a small mass of catalyst is needed to catalyse a large mass of reactants
specific to one reaction
name 2 examples of catalysts
- zeolites or aluminium oxide in the cracking of long chain hydrocarbons
- rhodium-based catalysts in a catalytic converter
what does a catalyst increase?
collision success rate
what does a catalyst do?
it helps reacting particles collide with the correct orientation
it allows collisions between particles with less kinetic energy than normal to be successful
