3. Particle Model Of Matter Flashcards
What is SA?
Surface area
Equation for volume of a rectangle?
V=h x b x l
Equation for volume of a triangle?
V=1/2xbxlxh
Equation for volume of a circle?
V=3.14r2xl
Equation for volume of a sphere?
V=4/3 3.14r3
Equation for density?
Density = mass/volume
How to measure mass of an irregular object?
Displacement method
What should water have a gradient of?
1
Why do gas particles move more quickly?
They have more energy when heated
What happens when particles have a higher kinetic energy?
Greater average kinetic energy so faster average speed
Equation for pressure?
Pressure = force / area
What is pressure measured in?
N/cm2 or N/m2
What is the symbol for density?
Rho
What happens when molecules collide with the wall of a container?
They exert a force on the wall
What is the unit area?
The total force exerted by all the molecules
What does the pressure of a gas depend on?
mass of molecules
speed of molecules - hitting walls more often
how many molecules - more molecules to hit the walls
What happens when the volume of a gas decreases while the temperature stays the same?
pressure decreases, The average speed stays the same but the molecules hit the walls more often
What does Boyles law state?
The pressure of a fixed mass of gas at a constant temperature is inversely proportional to its volume
pV=constant
pV=constant or…
p1V1=p2V2
Why are things different densities?
some atoms might have more mass than others
some atoms may be smaller so more can fit in the same space
they might be arranged differently
Equation for mass?
Density x volume
Equation for distance?
Distance = speed x time
Equation for force?
Force = pressure x area
Equation for area?
Area = force / pressure
Reasons for a difference in mass of the same volume?
- some atoms may have more mass than others
- some atoms may be smaller so more can fit
- some atoms may be arranged different so more can fit
