Reactivity Flashcards
melting salt: chemical or physical change?
Physical
Burning petrol: Chemical or physical change?
Chemical
Separating sugar from water in a sugar-water solution: Chemical or physical change
Physical
Boiling water : Chemical or physical change
Physical
Freezing food: Chemical or physical change
Physical
Separating sand from a mixture sand and water by filtration: Chemical or physical change
Physical
Puddles evaporating: Chemical or physical change
Physical
Heating silver oxide to form silver and oxygen: Chemical or physical change
Chemical
Lighting a match
Chemical
Respiration in cells : Chemical or physical change
Chemical
Nail varnish drying: Chemical or physical change
Physicalllllllllllll
Leaf rotting : Chemical or physical change
Chemical
Wax burning: Chemical or physical change
Chemical
Photosynthesis in leaves:: Chemical or physical change
Chemical
Condensing stream
Physical
Define implosion
An object destroyed by collapsing in on itself
What is a physical change
A change in which no new substances are formed
Give 3 qualities of a physical change
- do not make new substances
- are often easy to reverse
- the substances may change state or just be mixed together
Give 4 examples of a physical change
Melting
Boiling
Condensing
Freezing
Give 3 qualities of a chemical reaction
-always make at least one new substance
-are usually difficult to reverse
-the new substances have different properties from the original substance
-
Give 3 examples of a physical change
Combustion
Neutralisation
Thermal decomposition
How is gas pressure caused
By the force of the particles hitting the walls of the container
Why does increasing the temp. increase pressure
The particles move faster and they hit the walls of the container more often with more force
Why does increasing the number of particles in the container increase pressure
The particles are closer together and hit the walls of the container more often
