Subatomic
What is the positive charged subatomic particle of an atom?
Proton
What happens to the motion of particles when thermal energy is added to a substance?
The particles move faster.
What phase change occurs when a solid changes into a liquid?
Melting
Which property describes how much matter is in an object?
Mass
What is the smallest unit of an element that still has the properties of that element?
Atoms
What is the negative charge subatomic particle in an atom?
Electron
What happens to particle motion when thermal energy is removed?
The particles move more slowly.
What phase change occurs when a liquid changes into a gas?
evaporation
Which property describes the amount of space an object takes up?
Volume
What makes one element different from another element?
The type of atoms that make it up.
What is the neutral charged subatomic particle in an atom?
neutron
Which has particles moving faster: a cup of hot water or a cup of cold water?
Hot water
What happens to particle motion when a liquid freezes?
The particles slow down.
Is density dependent or independent of the amount of substance?
Independent
A model shows 5 identical blue spheres. What does each sphere represent?
An atom
Which subatomic particle is constantly in motion?
Electron
Two samples of the same substance are at different temperatures. Which sample has particles with greater average motion?
The sample with the higher temperature.
During melting, thermal energy is added to a substance. What happens to the particles?
Their motion increases as the substance changes from solid to liquid.
A pure substance has a melting point of 80°C. If you have twice as much of the substance, what happens to its melting point?
It stays the same.
A model contains 4 red atoms and 4 red atoms. Is this one element or two different elements? Explain.
One element because all the atoms are the same type.
What two subatomic particles are in the nucleus of the atom?
Neutrons and protons.
A student heats a solid. Describe what happens to its particles as thermal energy increases.
The particles move/vibrate faster and farther apart.
A substance is cooled until it changes from a gas to a liquid. What happens to the particles during this process?
They lose thermal energy, move more slowly, and come closer together.
A student has two samples of the same pure substance. Sample A has a mass of 20 g and Sample B has a mass of 40 g. Will their densities be different?
No. Density is independent of the amount of substance.
A model shows a substance made of two different types of atoms. Can the substance be classified as a single element?
No. An element contains only one type of atom.
No. An element contains only one type of atom.