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Particle Model
Mixing and Dissolving
Separating Mixtures/ Viscosity
Density/Buoyancy
Pressure and Fluid Systems
100
Describe particles of a solid in at least two different ways.
Particles are closely packed together They are always vibrating "packed party"
100
What is a homogeneous mixture?
A mixture that only has 1 identifiable part ex. Milk
100
What is desalination?
Removing salt from water
100
What is density? what is the formula that measure it?
Mass per unit volume of a substance D=m/V
100
What is the formula for pressure
P(pascals) = F(N)/A(m2)
200
Define Matter
Anything that has mass and takes up space
200
Provide an example of pure substance?
Answers may vary
200
List 3 ways to separate a mixture
Mechanical Floating Dissolving Magnets Filtration Evaporation
200
Problem Mass of an object is 15g the object measures 5cm high, 3 cm wide and 5cm long, what is the density?
V = lxwxh (5x3x5) V= 75cm3 M=15g D=m/V D=15g/75cm3 D=0.2g/cm3
200
Explain why a women walking in high heels walks across a field of grass will sink into the ground while the same women walking in the same field wearing wedges does not sink in.
The same amount of pressure (womens weight) is applied to the different surface areas of the two shoes
300
What is a fluid? Name 3 fluids you would find around house, in body or in environment?
Anything that flows - Gases AND liquids flow, examples may vary
300
How do you know a solution is saturated?
No more solute will dissolve
300
What is viscosity? What are the characteristics of a liquid with low viscosity?
Thickness or thinness of a liquid Low Viscosity = High flow rate (liquid moves fast ie. water)
300
Compare Densities of a Solid, Fluid and Gas
Solid - most dense - hard to run through brick wall Liquid - less dense than solid Running through water, particles move apart Gas - less dense than liquid or gas - Easier to pass through than liquid and solid
300
Why is it more difficult to compress liquids? hint* think particle model
Liquid has a fixed volume, gas does not
400
Draw a diagram that shows different states of matter and label the changes from each state to one another.
Solid, Liquid, Gas - Freezing, Melting...etc
400
What is the difference between emulsion and suspension?
Emulsion - agent added to a substance to prevent it from separating (mayonaise) Suspension - tiny particle that float in a mixture that WILL SETTLE AFTER TIME
400
What 3 things impact a liquids viscosity?
Solvent - Adding more solvent Temperature - heating up Types of Particles
400
What is difference between buoyancy and gravity?
Buoyancy is the tendency for an object to float, a force that pushes opposite of gravity
400
Explain a unbalanced pressure force
Substances of high pressure will look to move to an area of low pressure because the two pressure systems want to be balanced.
500
What are the 5 components of the particle theory
1.All matter is made up of tiny particles 2.All particles in a pure substance are the same 3.Particles have spaces between them 4.Particles are always in motion (moving, rotating, vibrating) 5. Particles in a substance are attracted to each other.
500
Identify these 2 WHMIS symbols and what they mean? Bonus: What does WHMIS stand for?
Work Hazardous Material Information System
500
Describe 2 jobs where viscosity would be important
Answers may vary - ie, mechanic, candy maker
500
Why do large cruise ships that are made of metal float?
Archimedes’s Principle – the buoyant force acting on an object equals the weight (force of gravity) of the fluid displaced by the object - weight of the water displaced is less than the weight of the object , object will sink
500
What is the difference between hydrolics and pneumatics?
hydrolics use built up pressure of liquids, pressure will be the same at all(wood splitter) while pneumatics use pressure of gases (air compressor)