cc7 Flashcards
paper 2
give two ways of measuring the rate of reaction
measuring the volume of gas produced or measuring the time taken for a colour change to happen
what has to happen for a reaction to occur?
particles must collide with sufficient energy
how can the rate of chemical reaction be increased in terms of collisions
increase the frequency and/or energy of collisions
how can the rate of a chemical reaction be increased practically?
increase the temperature, increase the surface area, increase the concentration, increase the pressure
if a rate of reaction graph is steeper, what does that mean?
The rate of reaction is high
how can you talk from a rate of reaction graph that the reaction has stopped?
The line levels of
how does a catalyst increase the rate of reaction
Reduced the activation energy, so more collisions are successful
what is a catalyst?
A substance that speeds up the rate of reaction without altering the products of the reaction, being its self unchanged, chemically, and the mass at the end of the reaction
what does the term activation energy mean?
The minimum amount of energy that colliding particles need to have for a reaction to happen
what is an enzyme?
biological catalyst
give a use of enzymes
The production of alcoholic drinks
what word describes a chemical reaction weather surroundings get hotter
exothermic reaction
what is exothermic reaction?
A reaction where heat energy is given out
what word describes a chemical reaction where the surrounding get colder
endothermic reaction
what is an endothermic reaction?
A reaction where heat energy is taken in
