Mix and Flow of Matter
Bell Work 1. What is the Model in chemistry we use in science 8 to teach you about matter? 2. Calculate the density of an object with a mass of 90 grams and a total volume of 30 milliliters. 3. Calculate the volume of an object with a mass of 30kg and a density of 6 kg/l.
The Particle Model of Matter What does it tell us?
3 states of matter What are they and how do the particles look?
How do we change states?
How do we classify matter?
How do they mix? What is the process called? What are the parts?
What 3 things affect the rate of dissolving?
How do we measure how dissolvable something is?
Which 3 things affect it?
How do we measure how tightly packed they are?
Density Calculate the density of a human with a mass of 72 Kg and a volume of 80L. Calculate the mass of a human with a volume of 50L and a density of 0.98 Kg/L Calculate the volume of a human with a mass of 60 Kg and a density of 0.90 L.
Most chemicals have safety concerns. What are these ones?
How do we measure how fast they flow? How do we increase it?
What is Archimedes Principle?
How do we measure how floatable something is?
What is Pascal’s Law?
Try! Mr. Bexson exerts a force of 100 N on a desk when he is angry. If the resultant pressure is 7000 pascals, what is the area of desk he hits? What is the pressure on a submarine if it has a surface area of 500 m2 and there is a force of 7000N exerted on it?
Finally, what systems do we make of these principles in everyday life?
Mechanical Systems
What are the 6 simple machines?
What are the 3 kinds of levers?
Which lever can only produce a max mechanical advantage of 1?
What do we use to create rotational motion/force and mechanical advantage?
How do we calculate the effectiveness of them?
Try it What is the speed ratio of a gear system with a 60 tooth gear turning a 20 tooth gear? How many teeth are on a gear that turns a 50 tooth gear with a speed ratio of 1:2 ?
How do we find mechanical advantage?
Try it What is the mechanical advantage of a 2nd class lever with a load arm of 15 m and an effort arm of 30 m? What is the mechanical advantage of a 2nd class lever with an input (effort) force of 16 N and an output (load) force of 8 N?
Where do we lose our input energy? Energy input = Energy output + energy lost due to friction?
What kind of pulley makes a mechanical advantage?
What do we use to measure force exerted over distance?
Try it Calculate the work done by an input force of 40 N over 2 m. Calculate the force exerted by a work input of 700 J over 5 m.
What does something like a bike chain do?
Which two kinds of systems exist that use these principles as well as Pascal’s law?
What do we call 2 simple machines together?
Examples of complex machines?
When more than one complex machine works together, what do they form?
Who made this machine?
Light and Optics
What is light?
What are the two types of light?
What are the five kinds of light sources?
What model did we use to describe the behavior of light?
What is the law of reflection?
What is refraction?
How does it work?
What else can light do?
What types of surfaces exist for light?
Lenses and Mirrors. What do they do to light?
How are the eye/camera similar?
How do we extend human vision?
Parts of the microscope
Scientists who discovered light Pythagorus - Light comes from our eyes. BUT if light came from our eyes, we would see in the dark. This does not happen. Euclid – Ray model of light (i.e. straight lines) Newton – White light can be split into many colours – wave model. Van Leeuwenhoek – Discovered bacteria under a microscope
3 Primary colours of light?
3 Secondary colours of light?
How do we see colour? Contrast?
The next model of light?
What does it look like?
The spectrum.
Cells and Systems
Living things – Functions. 5 of them. What are they?
Basic Unit of Life?
How do we see them thingies?
If you put a microscope onto 40x you’re magnifying by how much?
Organisms with more than one cell are called?
Parts of a cell?
Parts of a cell?
How does stuff move in and out of cells? 2 processes.
When cells specialize together, they become what?
When tissues work together, they become what?
When organs work together, they become what?
When organs work together, they become what?
When organs work together, they become what?
What are the major systems in the body?
Nervous System
Respiratory System
Circulatory System
Excretory System
Digestive System
Skeletal and Muscular Systems
Endocrine System
Digestive System
All of this stuff has its origins in what?
Fresh and Salt Water Systems
Earth’s freshwater distribution…where is it? How much is there?
Salinity measures what?
Silver nitrate tests for what?
Soap tests for what?
Glaciers. What do they leave behind?
The water cycle.
Waves and tides. How do they form?
What is distillation?
What is the continental divide?
Continental shelf/slope/trench.
Runoff from farmer’s fields can produce a lot of what in rivers and lakes etc?
Chemicals responsible for hard water are…
What do we call drinkable water?
What is lowered during the coral reef bleaching event we are living through?
What is this an effect of?
How much has the average temperature of the earth increased over the past 100 years?
Organisms at the bottom of the ocean undergo, not photosynthesis, but…
They get their source of energy from…
That about does it!
One Freebie…. What is a Slurry?
Credits… 8H and all your loveliness Mr. Bexson and his “in-your-face teaching style” About 17 dead frogs and 9 dead cows.