Particle Theory 1
If you heat a solid it turns to a ___________ .
liquid
Solids such as dry ice can turn to gas through a process called ____________ .
Sublimation
The first model of an atom was given by ___________
J.J Thomson
Name the subatomic particles of an atom.
protons, neutrons and electrons
This subatomic particle of the atom does not contain any charge.
neutron
This state of matter takes up all the space available to it.
When a gas turns to a solid (eg. frost) it is known as _______________ .
Deposition
Rutherford's alpha particle scattering experiment led to the discovery of ____________
nucleus / nucleus in the atom
Almost the entire mass of the atom is concentrated in the __________ .
nucleus
This philosopher suggested that all matter is made up of tiny indivisible particles but had no scientific evidence.
Democritus
The spaces between particles in cold materials decreases. True or False?
True
When food colouring is added to water, it dissolves faster when the water is _______ (hot / cold) .
hot
Which Law states that a given compound must always contain the same elements in the same ratio?
Law of Constant Proportion
The force of attraction between protons and electrons is called ______________ .
electrostatic force / charge.
These tubes were used in an experiment in which the electrons were discovered.
Cathode ray tubes / gas discharge tubes.
When a material is heated, the particles get larger. True or false?
False.
It is actually the spaces that increase between the particles.
Will Glucon-D be a solute or a solvent when it is mixed in water?
Solute
An atom is neutral because it has equal number of ____________ and ____________ .
electrons and protons.
This scientist's theory included that all atoms of an element are alike, atoms of different elements are different and that elements combine to form compounds. (full name of the scientist)
John Dalton
When you add food colouring powder to water, it dissolves in water. This statement best proves which postulate of the Particle Theory?
Particles of matter have empty spaces between them.
Temperature of Substance B = 60 degrees celsius
Which out of substances A and B will have particles with greater forces of attraction? Explain.
Substance A .
Lower the temperature, lesser is the kinetic energy of particles and more are the forces of attraction.
Wet floor dries up after some time of mopping due to the process of _____________ .
Evaporation
The word atom is derived from ______________ and it means _____________ .
Greek word "atomos"
indivisible
Name the atomic model that stated that electrons are evenly distributed throughout the entire positive mass of the atom.
Plum pudding model / Thomson's atomic model
Why are particles always moving?
because they contain energy (kinetic energy)