The outcome is controlled.
Results are obtained by computer models.
One variable is fixed while all others are changed.
One variable is changed while all others remain fixed.
Any visible solid that has mass.
Any liquid that takes up space and has mass.
Anything that takes up space and has mass.
Any liquid or solid that takes up space.
Melting ice cubes
All matter is made up of tiny, invisible particles.
Particles are smaller at lower temperature.
Particles move faster at higher temperature.
The particles are always moving.
The volume of the gas increases and the speed of the particles in increases.
The speed of the particles decreases.
The volume decreases.
The pressure decreases.
In all direction.
Both gases and liquids.
Neither gases or liquids.
Atoms cannot be subdivided.
Atoms are tiny.
Atoms of different elements are not identical.
Atoms join to form molecules.
The nucleus can be compared to the sun.
Electrons orbit the nucleus.
An electron's path is not known exactly.
Electrons exist in energy levels.
Moving electrons form an electron cloud.
Electrons and protons circle neutrons.
Neutrons have a positive charge.
The number of protons an atom has varies.
They have the same number of protons.
They have the same mass number.
They have similar chemical properties.
They have the same number of total electrons.