Chemical Reactions - Finished (?) Flashcards
What is the difference between a physical change and a chemical change?
A physical change can be reversed easily but a chemical change cannot.
What type of change creates a new reaction?
Chemical change (chemical reaction)
What are the 5 signs of chemical reactions?
- Gas given off
- Solid produced
- Temperature change
- Colour change
- Light given off
Provide some examples of everyday chemical reactions.
Milk going sour
Bike rusting
Lighting a match
Digesting food
Etc etc
Provide examples of physical reactions
Chopping vegetables
Water boiling
Stretching wires
Melting ice
Etc etc
Do the properties change between a compound and the elements that make it up?
Yes
Can a compound be easily separated into the elements that make it up?
No
What is the term for using electricity to separate a compound into its separate parts?
Electrolysis
Why does an increase in temperature increase the rate of reaction?
The hotter the particle is the faster it moves. The more they collide the faster the reaction.
Why does increasing the concentration increase the rate of reaction?
The concentration is a measure of how many particles are in the substance. More particles cause more collisions, speeding up the reaction.
Why does a decrease in particle size speed up the reaction?
There is more surface area for tge particles to collude with, increasing the rate of reaction.
