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Science Final Part 1

molecules // expansion and contraction // phase changes // measuring temperature

Answer
What is rigidity? The inability to be forced or bent out of shape.
What is fluidity? The ability of a substance to flow easily.
Density is marked by... The compactness or crowding together of particles.
What is motion? When objects change position over time.
How do particles in solids move? - They never stop moving - The atoms don't touch each other - they attract and repel each other, a.k.a. the "dance of the molecules"
How close are particles in solids? They are extremely close, yet do not touch each other. These particles form a lattice structure to keep themselves together.
What shape to liquids have? Liquids have no shape of their own. They take the shape of whatever container they are in.
What happens to the particles in liquids when they are heated up? The particles get warmer. The warmer they get, the faster they move around.
Once fast enough, what happens to the particles in liquids? Their attractive force breaks and the particles are able to move freely, slipping and sliding past each other.
What causes evaporation? When the particles get warmer, they speed up, causing water molecules to leave the system.
What happens as gas particles cool down? They slow down, causing their forces of attraction to take place.
The change from gas to liquid is called: Condensation [particles get more "dense"]
What happens when gas particles get hot? They move faster, pushing against their container and making it bigger [this is called "expansion"].
If warm particles mean expansion, cold particles mean: Contraction
How much space do warm and cold molecules take up? Warm molecules take up more space, cold molecules take up less space.
What are phase changes? Adding or removing energy from matter [heating or cooling] causing it to change states
Can the human body tell the temperature of something? No, it can only tell the difference between temperatures.
How was the Celsius temperature scale created? Anders Celsius used a tube of mercury to make the scale. The mercury contracts at 0°C, and expands to its boiling point at 100°C.
How do gas particles move? Gas particles are in constant motion, moving in straight lines until they collide into something.
How would one describe the collision of gas particles? The particles experience "elastic collision," which means they don't slow down.
What is the pressure of a gas related to? The pressure of a gas is related to the frequency and force of the collisions of the gas particles with the sides of their container.
What is the speed of gas particles related to? The speed of gas particles is related to their temperature.
Do gas particles stick to other particles? No.
Created by: hevi_k
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