Density
What is the formula of density?
Density = Mass/ Volume
What are the states of matter?
Solid, Liquid, gas, and Plasma
Melting point
The melting point of a substance is the temperature at which it changes state from solid to liquid.
Freezin is...
Liquid to gas
Every solid has an odor.
False
What are the units of density?
g/ ml. or g/ cm3
Give an example of four states of matter.
Solid: Wooden Block, Chair
Liquid: Syrup, coke
Gas: Oxygen, helium
Plasma: Neon rays, Lightening during a thunderstorm
Thermal conductivity
The ability to transfer thermal energy from one area to another. example: Plastic foam cup
All changes in the state of matter of a substance requires..
Energy
Sublimation is a phase change from liquid directly to gas.
False. It is a phase change from solid directly to gas.
Define mass and give an example of it.
Mass is the physical property of an object. It is measured in kilograms.
For example, a wooden block has a mass of 500g.
Define states of matter in terms of particle arrangement.
Solid: particles packed together very closely
Liquid: particles packed together closely with little space around them
Gas: Particles are far apart from each other
Viscosity
how quickly a substance flows in liquid form. example: Honey, oil, water
What happens to particles when they are heated?
They speed up and spread out
Melting a solid is a reversible process that means a solid that converts into liquid can be converted back into solid.
True. Melting is a process in which solid converts into a liquid when heated, and it becomes solid again once cooled.
Find density if mass = 25g and volume = 56ml.
Density = Mass/ Volume
= 25g/ 56ml
= 0.45g/ ml.
Define states of matter in term of in terms of shape and volume.
Solid: definite shape and volume
Liquid: definite volume but takes the shape of a container
Gas: No shape or volume
Plasma: does not have any shape or volume
A phase change from Gas directly to Solid.
What is condensation? give an example.
Condensation is a process of phase change from gas directly to liquid. Example: water drops while boiling water.
Making water vapor colder increases the rate of condensation.
True.
The dimensions of the block with the mass of 386g are 3.4cm by 2.6cm by 3.6cm. Find the density.
The volume of the block = L * W * H
= 3.4 X 2.6 X 3.6 = 31.82cm3
Density = 386g/ 31.82cm3
Density = 12.13g/cm3
What does The Kinetic Molecular Theory (KMT) say about states of matter?
All matter is made of very small particles.
The particles are in empty space.
Particles are constantly moving.
Kinetic energy makes the particle move.
Thermal expansion and Thermal Contraction
Thermal expansion: increase in the volume of a substance when its temperature increases.
Thermal contraction: decrease in the volume of a substance when its temperature decreases.
A student noticed frost was on the ground at 6:30 am but noticed it disappeared by 8:30 am. What phase change was responsible for turning the frost into water vapor?
Melting
Adding energy has no effect on the rate of evaporation.
False.