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Photo Chemistry 9
-Identifying Chemistry in Our World-
Judy Han Gr.9
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Table of ContentsMatter? Not Matter?
Pure Substance? Mixtures?
Element? Compounds?
Heterogeneous Mixtures? Homogenous Mixtures?
Mass? Volume?
Density? Viscosity? Conductivity?
States?
Physical Change? Chemical Change?
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Matter? Not Matter?
Matter
Not Matter
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Pure Substance? Mixtures?
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Pure Substance
Mixture
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Back
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Element? Compounds?
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ElementCompounds
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Heterogeneous?
Homogenous?
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Heterogeneous MixturesHomogenous Mixtures
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Mass? Volume?
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MassVolume
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Density? Viscosity? Conductivity?
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Density
Viscosity
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Conductivity
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States?
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States
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Physical Change? Homogenous Change?
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Physical Change Chemical Change
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Matter
: anything that has volume and mass
ex) water, air, sand
ㅡ Anything that takes up space and has mass is a matter. Therefore, a human and a car are matters.
Back Click Here forExplanations of
2 Types of Matter.
Not Matter
: anything that doesn’t have mass or volume
ex) thoughts, sound, emotion
ㅡ Light is energy, not a matter. It doesn’t have either volume or mass, which are important properties of matters.
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Pure Substance
: a type of matter that consists of only one type of particle
ex) copper, water, aluminum
ㅡ Water is always around us. It consists of only one type of particle, H2o, which is combination of two hydrogen atoms and one oxygen atom.
BackClick Here for
Explanations of2 Types of
Pure Substance.
Mixtures
: matter that has more than two pure substances
ex) iron mixed with sulfur, salt water, salad
ㅡ There are many different kinds of books on my bookshelf. They all have different colours and thicknesses, which makes it a mixture.
BackClick Here for
Explanations of2 Types of Mixtures.
Element
: a pure substance that cannot be transferred into any simpler form
ex) copper, aluminum, silver
ㅡ Aluminum foil is mostly made of aluminum which is an element, Al.
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Compounds
: a pure substance that is composed of two or more elements
ex) water
ㅡ Nail polish remover is mostly composed of acetone which is a compound, CH3COCH3 .
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Heterogeneous Mixtures
: a mixture that has uneven composition of large, visible particles
ex) water mixed with oil, salad, pencil case full of pens
ㅡ The school wall is mixture of different kinds of rocks and cement, and you can actually distinguish the particles pretty easily.
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Homogenous Mixtures
: a mixture that has even and microscopic composition of indistinguishable particles
ex) coffee, hot chocolate, salt water
ㅡ The mixture of ink and water is a good example of homogenous mixture because you cannot distinguish water particles and those of ink.
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Mass
: how much matter is in an object, which doesn’t change like weight
ㅡ Although those two objects have the same volume, the left one is more massive. That is because the left one has more amount of matter inside than the right one does.
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Volume
: the amount of space an object takes up
ㅡ Inside the plastic bag, there is air. The plastic bag takes up space and even though air is invisible, it is proven that air has volume. If air didn’t have volume, there would not be any balloon or ball.
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Density
: the amount of matter in an unit volume of an object
* How to Calculate Density: Mass/Volume
ㅡ From the photo, you can say that the yellow clay is floating on the water. This is because the yellow clays is less dense than the eraser. That means, the eraser has more matter in its unit volume.
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Viscosity
: the degree of resistance to flow from one spot to another of a liquid or gas; how thick a liquid or gas is
ㅡ As you can see from the photo, ketchup is dangling instead of falling right away. It is because ketchup is viscose, resisting to flow.
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Conductivity
: the ability of a matter to transmit electricity or heat
ㅡ The pot on the fire conducts heat, heating whatever inside of it. In this photo, there is water boiling inside the pot. If the pot didn’t conduct heat at all, it would be impossible to cook using it.
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States
: the physical property that shows in which form a matter exists: solid, liquid or gas
ㅡ These are the three states of water: ice, water, water vapor. The ice is solid in a certain shape, water is liquid in a pot, and water vapour is gas as you can see it coming out. Those bubbles are because of the water vapour escaping the boiling water to be free in the air.
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Physical Change (2 ex)
: change that cause a change in state or form of a matter, but not a change in the actual substance.
ex) ice cream melting
ㅡ In the first photo, a sheet of paper is torn apart, which changed the form of the paper. In the second photo, water vapour was blocked by the lid of the pot and cooled down due to the cooler lid. This is the change from a gas to a liquid.
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Chemical Change
: change that happens when a substance changes into one or more different substances.
ex) colour change of leaves
ㅡ Photosynthesis is chemical change, because the colour changes into green creating energy. The browning of an apple is chemical change for the same reason.
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