C1 - Particles Flashcards Preview

Chemistry OCR GCSE > C1 - Particles > Flashcards

Flashcards in C1 - Particles Deck (19):

What happens to the vibrations of particles when a solid becomes hotter?

They vibrate more


What happens if you heat a solid?

It will melt and become liquid


How are the particles in solids arranged?

In a regular lattice arrangement


How do the particles in solids move?

They vibrate around a fixed position


How do the particles in liquids move?

They move constantly with random motion


What happens if you cool a liquid

It will freeze and become solid


What happens if you heat a liquid enough?

It will evaporate and become a gas


How do the particles in gases move?

They travel in straight lines and only interact when they collide


What do gases exert?



What happens if you cool a gas?

It will condense and become a liquid


What are the limitations of the particle model?

1) does not give any idea of the size of the particles
2) does not give any idea of the space between the particles
3) does not show any of the forces between the particles


What is a physical change?

1) when a substance changes from one state of matter to another
2) no new substances are made


What happens during a chemical reaction?

1) bonds between atoms break
2) atoms change places
3) atoms from the reactants rearrange themselves to form products


What are atoms

Tiny particles of matter which make up everything in the universe


How did John Dalton describe atoms?

1) solid spheres
2) different spheres made up different elements


How did JJ Thompson describe atoms?

1) plum pudding model
2) atoms weren't solid spheres
3) atoms contained negatively charged particles - electrons


How did Ernest Rutherford describe atoms?

1) in the atom there is a tiny, positively charged nucleus at the centre
2) most of the atom is empty space


What was the gold foil experiment?

1) positively charged alpha particles were fired at an extremely thin sheet of gold
2) most particles passed straight through the gold sheet
3) some particles were deflected more than expected
4) a small number of particles were deflected backwards


How did Niels Bohr describe atoms?

1) electrons in atoms were contained in shells
2) electrons can only exist in fixed orbits, or shells
3) each shell has a fixed energy