Matter and Particles
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
Fluid includes these two states of matter.
Liquid and gas.
This is the formula for pressure and the correct units.
Force divided by area, where force is in newtons and area is metres squared.
Name a technology that uses buoyancy
Submarines,, divers
What is the difference between MASS and WEIGHT and what are their units?
1) MASS - amount of matter in a substance (kg). WEIGHT - the force of gravity exerted on an object (newtons).
This force allows things to float.
BUOYANT FORCE.
The brakes in your car use this system.
HYDRAULIC system.
What happens if a diver ascends too quickly from a deep dive?
The Bends. Nitrogen gas bubbles in the skin and causes inflammation.
You were adding a solute to water (the solvent) in a beaker and it was dissolving nicely. You added more solute and suddenly it started forming crystals in the beaker. This is now called a __________ solution.
Supersaturated!
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).
What is the Pressure if a foot stepping on a lego piece if the force is 75000N and the area is 0.16m2?
468750Pa
What is Pascal's Law?
F/A = F/A
An enclosed fluid transmits pressure equally in all directions
What does WHIMS stand for?
Workplace Hazardous Materials Information System
Name 1 example of a suspension mixture?
Salad dressing
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
Which would have the highest density?
5.6g/10mL OR 12g/20mL?
the 12g/20mL
What happens to pressure when the area increases while the force stays constant
It decreases
What is the term for the process by which a solid turns directly to a gas?
Sublimation
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.
Why did the molasses disaster in Boston happen?
The heat during the day causes the particles of molasses to expand. The tank was too full. The tank was made of cheap metal. When the molasses flooded the streets it got cold and more viscous.
Explain what happens to buoyancy in salt water vs fresh water
You become more buoyant because the salt makes the water more dense increasing the buoyant force
He put a crown in a bath and realized the displaced water was equal to the weight of the crown.
What is the acronym SCUBA stand for?
Self Contained Underwater Breathing Apparatus