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What is melting?
When a solid becomes a liquid. The particles gain energy and start moving more until they move so much they become un-stuck
Explain evaporation
Individual particles gain energy from the sun, other particles, etc until they gain enough to turn into a gas
Explain boiling
Boiling happens everywhere in a liquid,h appens at a liquids boiling point (temperature.) Happens when pressure in gas and in lquid are equal.
What is the difference in evaportion and boiling?
Boiling happens everywhere in the liquid. Evaporation happens on the surface of a liqui
What is vaporization? What are the types?
Vaporization is when a liquid turns into a gas. The two types are evaporation and boiling.
How do the particles in a solid behave?
They can't freely move past each other but they vibrate in place.
Where does evaporation happen?
On the surface of the liquid. Molecules slowly gain energy until they vaporize and become a gas one at a time.
When the air pressure above a liquid increases, what happens to the amount of thermal energy need for the liquid to vaporize (boiling)?
It also increases. The temperature required to boil the liquid gets higher.
What is condensation?
The process of a gas turning into a liquid. It cools and the particles inside slow down enough for the air to become moisture.
What is sublimation?
It is the process of a solid turning directly into a gas, skipping the liquid phase.
What is happening when something is boiling?
It is the process of the kinetic energy of particles increasing to the point that they transform into a gas? It happens above and below the surface of a liquid.
When water freezes what is happening to the particles inside it?
They are losing energy and slowing down until they become stuck in place, turning into a solid (ice)
What are the types of nuclear energy and what is the difference? Which is strongest?
Fusion and fission. Fusion is joining atoms (the nuclei) and fission is splitting them. Fusion is stronger.
What is nuclear energy?
Nuclear energy is the energy in the nucleus, or core, of an atom. It occurs when nuclei are split or joined together.
What is elastic potential energy?
the energy of objects that can be compressed or stretched. Stored in such things as a Slinky, a spring, or a bungee cord, or a rubber ball.
What is the mathematical formula for gravitational potential energy?
Gravitational potential energy = Weight (in Newtons) x Height (in Meters)
How can we determine gravitational potential energy of an object.
You can measure the amount of work (vertical postion x weight) it would take to lift that object to it's current height,
What determines the gravitational potential energy of an object?
It's vertical position and it's weight.
What is the type of potential energy that comes from vertical position?
Gravitational potential energy. Ex: Anything in the air or a high position. Ex: A plane,or a cat at the top of stairs.
What is the type of potential energy that comes from shape?
Elastic potential energy. Ex: A bouncy ball, a rubber band, a slingshot, a spring
What is potential energy?
Energy that results from the position or shape of an object. For ex: Abike at the top of a hill, or a rubberband.
What is the mathematical formula for kinetic energy?
kinetic energy = 0.5 x mass x speed²
What affects kinetic energy?
Speed and mass
What unit is force measured in?
Newton
What unit is work measured in?
Joules
What unit is power measured in?
Watts
What is the mathematical formula for power?
Power = Work/Time
2 People load 10 items on the truck in 10 minutes: How can power be increased?
By loading more items in 10 minutes, or loading 10 items in less than 10 minutes.
What is power?
Power is how quickly work is done. Doing work faster, or doing more work in an equal time increases power.
Imagine that you are trying to open a jar, and the lid is stuck. You exert a lot of force on the lid, but it doesn’t move. Are you doing work?
No. No matter how much force you exert, you don’t do any work if the lid does not move.
What is work?
Any time you exert a force on an object that causes the object to change its motion in the same direction in which you exert the force.
What is Force?
A push or a pull.
What is motion?
When an object's position changes relative to another object.
What is energy?
The ability to do work or cause change
The particles of what type of solid are arranged in a regular pattern?
A crystalline solid
What is the law of conservation of matter/energy?
It says matter/energy can niether be created or destroyed, only changed.
What is thermal energy?
The energy contained within a system that is responsible for its temperature. It comes from the movement of it's particles (faster movement = higher temperature
What is temperature?
The meassure of how hot or cold something is
What are the characteristics of a gas?
Doesn't have a defnite shape or volume. Tries to fill any container it's in. Least dense. It's particles freely move.
What is surface tension?
An inward force or pull between molecules in a liquid.
What is viscosity?
A resistance to flowing.
What are the characteristics of a liquid?
It has a definite volume but not a definite shape. It is relatively dense but less dense than a solid. It's particles can move freely past each other.
Which type of solid has a definite melting temperature?
A crystalline solid
What are the characteristics of a solid?
It has a definite shape and volume. It has a high density. It's molecules cannot freely move past each other, only vibrate in place.
What are the two types of solids?
Crystalline and amorphous
How is mass different from weight?
Mass remains constant while weight depends on location. Mass is how much stuff there is in an object, weight is how heavy an object is.
What is weight?
The measure of the force of gravity on an object
What is density?
How tightly packed a mass is
What is a homogenous mixture?
A mixture where you cannot see the different parts
What is a heterogeneous mixture?
A mixture where you can see the different parts
Mass divided by volume = ????
Density
What are the two types of mixtures?
Homogenous and heterogeneous
How do you measure volume?
By either: measuring the dimensions of an object and multiplying them OR submerging an object in a known amount of water and measuring the difference.
What are atoms made of?
subatomic particles: protons, neutrons, electrons
What is a compound?
2 or more atoms of at least 2 different elements bonded together (Micro)
What is a molecule?
2 or more atoms bonded together
Express this number in scientific notation: 10,000,000,000,000
10^13
How is a molecule different from a compound?
A molecule is may only be made of one element, whereas a compound will always have at least 2 elements.
Water and CO2 in leaves is converted to oxygen and sugar: What kind of property does this describe?
A chemical property because the water and CO2 are CHANGING into sugar and oxygen. They become something different from what they originally were.
What is a chemical property?
Charateristics that describe something's ability to become something else. Include: flammability, reactivity, radioactivity, corrosion
what is a physical property?
A property that can be observed without changing the matter into another type of matter. Includes: Texture, hardness, luster, density
What is a substance?
A single kind of matter that always has a specific makeup (Macro). Similar to a compund, but bigger
What is matter?
Anything that has mass and takes up space.


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