Physical & Chemical Changes
Is freezing a physical or chemical change of water?
Physical change
Oxygen is a ... (solid, liquid, or gas)
gas
the process name when a liquid turns into a solid
freezing
what factor that affect the particle movement in kinetic particle theory?
temperature and pressure
The diffusion occurs in a high-pressure region into a ... pressure region
low
Burnt paper, baked cake, and decomposed food are a ... reaction
chemical
the type of matter that has no space between particles
solid
The process name when a solid turns into a gas
sublimation
boiling point
Diffusion is the movement of particles in a liquid or a gas as they move from a region of ... concentration to a region of ... concentration
high, low
an example of the solid form of milk
cheese
type of matter when the particles vibrate against each other
liquid
if someone moves the milk in a bottle into a glass, what will happen?
the shape will change
why does a solid become a liquid when the temperature increases?
the particle moves faster
what energy do we need to make the smell of the food spread to the whole room?
heat
The difference between chemical and physical reaction
a chemical is irreversible, physical reaction is reversible
If the temperature increases, the particles will move...
faster
the process name when a liquid turns slowly into a gas
evaporation
if the temperature is high enough, the particles are sufficiently attracted to each other, causing their kinetic energy to ...
increase
why can't we smell the food when it's cool?
no energy (heat) added to make the particles move faster and accumulate in the air
name of the transformation from solid into liquid
melting
if the water is heated, it will turn into...
water in the form of gas
The particles break away from their fixed positions and are able to move around each other. The solid has changed to a liquid.
melting
if the salt water evaporates, which components will turn into a gas first?
water
what is the meaning of high concentration?
There are a lot of particles in a small space in between