When this occurs, the identity of the substance does change (it is irreversible)
What is a chemical change
300
Coke
What is a mixture
300
Particles are very close together in a given volume
What is a solid
300
The formula for density
What is D = m/v
300
Law of conservation of mass/energy
What is energy/mass cannot be created or destroyed
400
Making spagetti
What is a chemical change
400
Steel
What is a mixture
400
Particles move together and have a definite shape but no definite volume
What is a liquid
400
If you put Mentos in Diet Coke a stream will shoot out of the 2-Liter
What is chemical
400
A liquid substance evaporates and becomes a gas. This means that energy is required and particles are moving __________.
What is faster
500
The difference between physical/chemical property and physical/chemical change
Property: Helps identify a substance
Change: Something is being done to the substance that may or may not change the identity of the substance
500
The difference between homogenous and heterogeneous mixtures
Homogenous: Same throughout
Heterogeneous: Not evenly distributed
500
Solid --> Gas
What is sublimation
500
An unknown object has a mass of 20 g. You calculated the volume using the displacement method and found the volume to be 5 ml. What is the density of the unknown object?
What is 4 g/ml
(20 g / 5 ml)
500
In a line graph of temperature vs. time, you see the temperature increase and then stay steady for a certain period of time. A _____________ has occurred.