P6 - Molecules And Matter Flashcards
How do you measure the density of a object/liquid?
Measure mass and volume and use equation p=m/v
When do objects float?
When they have a lower density than water (less than 1000kg/m3)
Most energetic state of matter?
Gas.
Less energetic states of matter?
Solid.
Why does the mass of a substance stay the same when it’s state of matter changes?
Because the number of particles are the same.
The flat point of a temp-time graph gives what?
The melting/boiling point of a substance
Increasing the temperature of a substance increases….
It’s internal energy.
Latent heat?
The energy needed for a substance to change state without changing temp.
E. Latent heat?
E=mL
D. Specific latent heat of fusion/vaporisation?
Energy needed to melt/boil 1kg of a substance without changing its temp.
How can the specific latent heat of ice/water be measured?
By using a low-voltage heater to melt the ice/water
What caused pressure of a gas?
The random impacts of gas molecules on surfaces that are in contact with the gas.
