Unit 1 - Explaining Physical Changes 2 Flashcards
Density
The mass of a material per unit volume
Mass
The amount of matter in an object measured in kilograms (kg)
Volume
The amount of space taken up by an object
Float
To move or rest lightly in a liquid or in the air
The number of particles packed in a certain volume
Concentration
Concentrated
Having a high number of solute particles
Having a low number of solute particles
Dilute
Pressure
The average force on a certain area
A standard unit of pressure where one kilopascal equals 1000 pascals
Kilopascal (kpa)
Diffusion
The movement that causes particles in a liquid or gas to spread out evenly
A stable state in which no overall change is occurring
Equilibrium
Concentration gradient
The difference in concentration
The total mass of the reactants is the same as the total mass of the products
Law of Conservation of Mass
Chemical reaction
A process which changes substances by the rearrangement of their atoms
The change from one state (solid, liquid or gas) to another
Physical change
Efficiency
A measure of how well something transfers energy to useful outcomes
Can also work in the opposite direction
Reversible
Exothermic
A chemical reaction in which heat energy is given out
A chemical reaction in which heat energy is taken in
Endothermic
Particle model
Used to explain the kinetic theory of solids, liquids and gases
Mixture of two liquids one water-based, one oil-based.
Emulsion
Colloid
When different states of matter are dispersed together
Mixture of gas bubbles trapped inside a liquid
Foam
Gel
Mixture of liquid particles floating in a solid
