Matter
Complete:
Matter is anything that has _____ and _____.
Matter is anything that has mass and volume.
What is an atom?
The smallest unit of an element.
Choose:
Opposite charges repel/attract.
Like charges repel/attract.
Opposite charges attract.
Like charges repel.
What is friction?
a) an element
b) a a subject
c) a force
A force.
Density is:
a) how compact the molecules of a substance are.
b) the relationship between mass and volume.
c) a property.
d) all of the above.
e) none of the above.
d) all of the above.
How compact the molecules of a substance are, the relationship between mass and volume and a property.
What is matter made of?
Matter is made of atoms.
What are the main two parts of an atom?
Nucleus and electrons.
Say the electric charges of:
Protons
Neutrons
Electrons
Protons +1
Neutrons 0
Electrons -1
What does the force of friction resist?
Movement / Motion.
Talking about density, what happens if you apply pressure to an object? what happens if you heat it?
If you apply pressure to an object, its density increases. If you heat it, its density decreases.
How do you call a substance made up of only one kinds of atoms?
Elements.
Besides the nucleus and electrons, what are the other elements of an atom?
Inside the nucleus are the protons and neutrons. The electrons spin in energy levels called electron shells.
What happens when an atom gains an electron?
It becomes negative charged.
How can you reduce the force of friction?
Explain why the solid state of water (ice) is an exception to the rule of density: The solid state of most substances is denser than their liquid state.
Water's solid state (ice) is less dense than its liquid state, that is why it floats.
Mention 3 different properties elements can have.
Size, shape, color, density, state, luster, hardness, elasticity and conductivity.
If the atomic number is the number of protons inside the nucleus of an atom, what is atomic mass?
The number of protons and neutrons inside the nucleus of an atom.
What happens when an atom looses an electron?
It becomes positive charged.
Mention the 3 types of dry friction.
Static friction, sliding friction (kinesthetic friction), and rolling friction.
How can you calculate density?
Density = mass / volume
Mention the four states of matter.
Solid, liquid, gas and plasma.
What is an ion?
A charged atom.
A atom that has gained or lost one or more electrons.
What is electrostatic discharge?
The release of energy from a charge object.
Describe fluid friction.
Fluid friction is a force that restricts the movement in water or air.
How do you express density for solids and liquids?
Density expression for solids: g/cm³
Density expression for liquids: g/ml