The particle model of matter Flashcards
Almost everything is made of ___ .
particles
Particles can be __ , ___ or ___.
atoms
molecules
ions
Particles behave differently in___ , __ and ___
solids
liquids
gases
The __ explains the differences between solids, liquids and gases.
particle model
Water exists as a solid, liquid and as a gas. What name is used for solid water and gaseous water?
Solid water is ice. Gaseous water is steam.
In a __ , the particles pack together tightly in a neat and ordered arrangement. The particles are held together too strongly to allow much movement but the particles do vibrate.
solid
In ___, particles are quite close together and move with random motion throughout the container.
liquids
In ___ the particles move rapidly in all directions, frequently colliding with each other and the side of the container.
gases
The hotter a solid gets, the faster its particles vibrate. This means that solids __ when they are heated.
expand
So particles in __ can move around and can move over each other, allowing __ to flow and be poured.
liquids
liquids
Sand can be poured, but it is definitely a solid. Why is this?
Sand is made from tiny grains, and even though these can roll over each other, each grain of sand has a fixed shape.
Why is helium gas used inside party balloons?
Helium gas is lighter than the mixture of gases that make up air. The lighter helium gas is trying to move above the air making the balloon rise up.
What are models?
Models are used in science to help explain scientific concepts.
What is a control variable?
The control variable is kept the same during the experiment.
What is an independent variable?
The independent variable is changed during the experiment.
What is a dependent variable?
The dependent variable is tested or measured during the experiment.
Pressure in gases is caused by particles __ with the walls of the container.
colliding
Gas pressure is increased when the temperature __ or the volume of the container ___ .
increases
decreases