Particle Theory
What are all substances made of?
Particles
What is diffusion?
The spreading out of particles
What is a solution?
A mixture where one substance dissolves in another
In salt water, what is the solute?
Salt
What does Soluble mean?
Can dissolve
Do particles in a solid move?
A little.
They vibrate
Give an example of diffusion in every day life.
(We used it in our lesson on diffusion)
Perfume spreading in a room
Name an example of a salt solution
Sea water
In vinegar, what is the solvent?
Water
Can mixtures be separated?
Yes
Which state of matter has particles that are far apart and move fast?
Gas
In which state does diffusion happen fastest?
Gas
What TWO components make up a solution?
Solute and solvent
Which is usually present in the LARGEST amount?
Solute or Solvent?
Solvent
Is air a mixture?
Yes
What happens to particles when substances are heated?
They move faster and spread out
Why does food colouring spread in water?
Particles mix and spread with diffusion
Is muddy water a solution? Why?
No. Sand doesn't dissolve in water.
In hot chocolate, what is the solute?
Chocolate powder / sugar
Name a method to separate mixtures?
Filtering
Sieving
Evaporation
Handpicking
Why can gases be compressed more easily than solids?
Their particles are far apart with lots of space in between
Does diffusion happen faster in hot or cold water?
Why?
Hot.
Particles move faster in hot.
What happens when too much solute is added?
It becomes SATURATED and no more can dissolve
Can water be a solute?
Yes, depending on the mixture.
Name two things that can affect how fast something dissolves
Temperatures
Stirring
Particle Size