Test 2 Flashcards
Thermal Decomposition
A chemical reaction due to heat
Chemical Change
Substance combined with another substance to form a new substance.
Physical Change
Are changes that affect the form of a substance.
S-curve or heating curve.
Phase Change Diagram
Diagram in the form of a S.
What Chemical thermally decomposed when you heated it and how do you know?
Sulfur
What is the difference between a chemical change and a physical change?
A chemical change is where one substance and another substance are combined to make another substance
A physical change is where the form of the substance changes, but it is still the same substance.
Give an example of a chemical change.
Iron oxide (or rust) on a piece of metal. Because of oxygen.
Give an example of a physical change
Breaking a glass
Phase Change
Matter changing from one state to another
Boiling/Evaporation
Evaporated is the process of a liquid changing into a vapor
Boiling is the action of a liquid to the temperature at which it bubbles and eventually turns into a vapor.
Condensation
Going from a gas to a liquid
Freezing
Going from a liquid to a solid
Melting
Going from a solid to a liquid
Solid
Stable shape, not a liquid or a fluid
Liquid
A substance that flows freely, but is of constant volume.
Gas
An air like fluid that flows freely and takes up as much space as possible.
Mass
Solid, liquid, gas
What does a heating curve show and what is happening at the plateaus?
A heating curve shows the process of a substance being heated. At the plateaus a phase change is occurring.
What are some examples of phase changes? Be able to describe what is happening.
Solid to a gas. Which is a process called melting
Gas to a liquid. Which is a process called condensation.
Law of conservation of mass
Mass can not be destroyed or created
Closed system
Does not let matter in or out
Example-closed water bottle
Open system
Allows matter to go in and out
Example-donut
What happens to the mass in a open or closed system
Closed system-mass will stay the same
Open system-mass will change
