Matter and Particles
Resistance to Flow
Learning to Float
Under Pressure
Random
100
Give an example of a homogeneous mixture.
Homogeneous mixtures are solutions (every part of the mixture is the same even though there are different substances mixed together). Ex: paints, vinegar, air, Kool-Aid
100
What is the formula to calculate flow rate?
flow rate = mL/second OR flow rate = L/second
100
Fluid includes these two states of matter.
Liquid and gas.
100
This is the formula for pressure and the correct units.
Force divided by area, where force is in newtons and area is metres squared.
100

The fourth state of matter:

Plasma

200

The process of a solid instantly becoming a gas is called

sublimation

200
To INCREASE the viscosity of a GAS, what should you do to the temperature?
INCREASE the temperature (this increases collisions between particles which makes it harder to flow).
200
This force allows things to float.
BUOYANT FORCE.
200

What kind of system has two pistons, connected by a hose, filled with fluid? It can be used to lift things up in the air, or make cars raise up, lower, and bounce.

a HYDRAULIC system.

200

Which state of matter has particles moving so fast electricity can pass through it?

Plasma

300

The melting point is actually the same temperature as this

The freezing point

300
You want to increase the viscosity of a liquid. To do this you must 1) ________ temperature. 2) Why?
1) DECREASE 2) this increases attractive forces between liquid particles, making it more viscous (flows more slowly).
300
Will an object with a density of 0.23 g/mL float, sink, or hover in a substance with a density of 0.32 g/mL?

Float, because it has a smaller density than the water.

300
Technically, NO ONE can drink out of a 30-foot straw. UNLESS we managed to somehow increase this.
AIR PRESSURE.
300

When particles are moving slowly and are arranged tightly together, then we have a...

Solid

400
Why do gases have no set volume?
They are able to move in all directions.
400
You emptied a 20mL of oil over a frying pan in 10 seconds. What is the flow rate of the oil?
Flow rate = mL/second = 20mL/10seconds = 2mL/s
400
Machine oil has a density of 0.9 g/mL. Ethyl alcohol has a density of 0.8 g/mL. 1) Which has greater density? 2) Which will float on top of the other one?
1) Machine oil has greater density (0.9 > 0.8) 2) Therefore, knowing that denser things SINK, the ethyl alcohol will FLOAT on top of the machine oil, because it's density is lower.
400
I can increase water pressure in a hose by doing this.
NARROWING the opening / DECREASING area (ex: putting my thumb over the opening).
400

If particles start off close together and slowly moving, and then end up moving fast and far apart, did we add heat to the particles or remove heat?

We added heat

500
What are the 5 points in the Particle Theory of Matter?
1) All substances are made up of tiny particles. 2) All particles in a pure substance are the same. Different pure substances are made up of different particles. 3) Particles have spaces between them. 4) Particles are always in motion (vibrating/rotating) in liquids/gases. Motion increases with temperature. 5) Particles in a substance are attracted to one another. Strength of attraction depends on the type of particle.
500
You know that a certain type of oil has a flow rate of 2mL/s. If you HEAT up 20mL of oil so its flow rate DOUBLES and then pour it over a frying pan, how long should it take to flow over the frying pan?
Original flow rate is 2mL/s but it is HEATED and so its flow rate doubles to 4mL/s. Flow rate = mL/s Seconds = mL/flow rate = 20mL/4(mL/s) = 5 seconds!
500

What is the density of an object that has a mass of 5g and a volume of 15cm3?

Will it float in water (water's density is 1g/mL)

The density is approximately 0.33 g/cm3.

It will float because it has a smaller density than water.

500

Calculate the pressure exerted by an elephants foot (an area of 100 cm2) with a force of 365N.

3.65 Pa

500

Would a force of 35N exert a greater pressure over an area of 0.25m2, or 0.35m2?

The pressure would be greater over an area of 0.25m2
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