Magnetic Forces
As the distance between magnets increases, the attraction between them will –
decrease
A directional flow of electric charge
current
The basic building block of matter; made of electron(s), proton(s), and neutron(s)
atoms
Particles that vibrate close together in substance
Solid
Temperature is not a direct measure of the thermal energy of a system. The total thermal energy of a system depends on its temperature and what other factors?
The mass of object, number of atoms in the system,conductivity of the material
The tendency to pull other objects toward it
Attraction
_________ objects exert forces on each other.
charged
The smallest unit of a compound
Molecule
The distinct form of matter
State
What happens to water molecules when a large quantity of thermal energy is added to water in the liquid state?
The molecules gain kinetic energy, move farther apart, and become a gas.
The tendency to push other objects away from it
repulsive
What will happen as an electron (-) gets closer to a proton (+)?
The attraction will be stronger
What is it called when a molecule contains two or more elements?
Compound
How many of atoms each element exist in this chemical formula:
2Na2SO4
Na:
S:
O:
Na: 4
S: 2
O: 8
In science, the term “heat" is used to describe which of the following?
The transfer of thermal energy from one object to another
When magnetic poles that are ____________
align, they will have an attractive force.
opposite
Matter with a surplus of electrons
Charged object
Anything with both volume and mass
Matter
Particles move freely at a very fast speed
Gas
Thermal energy is removed from a sample of helium. What will not be a result?
The temperature of the system will decrease.
Total energy in the system increases.
The molecules of the system will lose kinetic energy.
The molecules will become more packed.
Total energy in the system increases.
How can the strength of an electromagnet increase?
Add more wire around it
When the currents of two electromagnets are increased, the size of the ____________ is increased
force
The energy an object has because of its motion
Kinetic Energy
The energy of the motion of the particles in the matter
Thermal Energy
When thermal energy is removed from a system, what happens to the temperature and the average kinetic energy of the system?
Temperature decreases, average kinetic energy decreases