States of Matter Flashcards
meaning of the term viscosity
viscosity is a measure of a fluid’s resistance to flow.
how does temperature affect the viscosity of a liquid
The viscosity decreases with an increase in temperature. The more viscous the fluid, the more sensitive it is to the temperature change.
meaning of the term “diffusion”
the movement of molecules from an area of their higher concentration to an area of their lower concentration
Explain why diffusion occurs at different speeds in liquids and gases.
This is because the particles in a gas are more spread out and move faster than the particles in a liquid
give some everyday examples of expansion/contraction.
Train tracks need to expand with the hot weather and power cables have a sag in the middle, so when they contract in the winter they won’t break.
is chemistry cool
yeah!
what is the concept of air pressure
The air that surrounds you is made up of billions of billions of particles buzzing around. Countless billions of particles are hitting your skin, exerting a force. We call this force Air Pressure. The pressure inside us pushing out balances out the air pressure on the outside pushing in.
how do you find density of a solid and of a liquid
Calculate the density (mass/volume)
To find mass, weigh object or liquid
To find volume of a solid, calculate (lengthbreadthheight)
To find volume of a liquid use a measuring beaker.
what is the concept of density
Density is a measure of the thickness with which mass is packed. The more closely atoms are packed the higher the density will be.
how do you predict whether an object will float having measured its density.
The density of an object determines whether it will float or sink in another substance. An object will float if it is less dense than the liquid it is placed in. An object will sink if it is more dense than the liquid it is placed in.
