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Welcome Back! Today we will:. Check your books and binders. Talk about this semester’s plan. Talk about your study skills and…. Our NEW homework policy. You must finish all your homework before t he Friday before any exam or…. YOU DON’T WRITE THE EXAM!.

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welcome back today we will
Welcome Back! Today we will:

Check your books and binders

Talk about this semester’s plan

Talk about your study skills and…

our new homework policy
Our NEW homework policy

You must finish all your homework before

the Friday before any exam or…

my office hours
My office hours:

Everyday: 7am – 7:50am

Everyday: 12:15pm – 12:50pm

If you ask me I can also see you at

17:00 – but you have to ask.

how to study
How to study?

Review AND UNDERSTAND every lesson

(5 – 10 minutes)

Before tests study is small groups

Come see me in my office!

slide12
1. Explain what happened to the bike lock.2. Why do the lanterns fly?3. Why can we see steam when we eat hot Xiao long bao?
slide13
Bike Lock?- cold, particles move slower, hard to change shape, “hard solid”- warm, particles move faster, easy to change shape, “soft solid”
slide14
Lanterns?- fire inside makes particles move faster, farther- particles outside are slower, closer- outside air is more dense than air inside lantern- lantern floats up
slide15
XLB?- XLB has water inside- the XLB is hot- water’s particles move faster and farther- water evaporates to steam- we see steam
slide16
Chemistry is the study of changes of matter:Matter is anything that has mass or volume.Mass is the amount of stuff in something.Volume is the amount of space something needs.
slide17
Chemistry is the study of changes of matter:Matter is anything that has mass or volume.Mass is the amount of stuff in something.Volume is the amount of space something needs.
slide19
Matter is anything that has mass or volume.Mass is the amount of stuff in something.Volume is the amount of space something needs.
matter stuff
Matter = Stuff

Apples are matter, so are

cats, air particles and

people.

Matter is everything

matter stuff1
Matter = Stuff

Apples are matter, so are

cats, air particles and

people.

Matter is everything

mass how much stuff is in something
Mass = How much “stuff” is in something.

It is NOT how heavy something is. Why?

Because mass does not change on

other planets,

but things can be heavier of lighter

on other planets.

mass how much stuff is in something1
Mass = How much “stuff” is in something.

It is NOT how heavy something is. Why?

Because mass is the same on

other planets,

but things can be heavier of lighter

on other planets with different gravity.

slide26
Some things can have the same volume but different mass. For example: this cup with water and this cup without water
slide27
Some things can have the same volume but different mass. For example: this cupwith water and this cup without water
slide32
Thinking: For example, please think of 2 things (1 pair) that have the same (or almost the same) volume but not the same mass.
the particle theory of matter
The particle theory of matter.

All matter is made of very small

particles

There are spaces between the

particles (different states have more or

less space)

the particle theory of matter1
The particle theory of matter.

All matter is made of very small

particles

There are spaces between the

particles (different states have more or

less space)

how small are particles one small drop of water has 1000000000000000000000 particles in it
How small are particles?One small drop of water has 1000000000000000000000 particles in it.
3 the particles are always moving
3. The particles are always moving.

4. Particles like to “go together”

slide45
Particles move fast and far in gases. Particles move slower and closer in liquids. Particles “shake” in solids.
slide46
Particles move fast and far in gases. Particles move slower and closer in liquids. Particles “shake” in solids.
physical vs chemical change
Physical vs. Chemical change

The physical change there is no new

substance (物质), just frozen water and

common water.

The chemical change there is a new

substance. It is CO2.

physical vs chemical change1
Physical vs. Chemical change

The physical change there is no new

substance (物质), just frozen water and

common water.

The chemical change there is a new

substance. It is CO2.

physical properties
Physical Properties

Physical properties are ways to describe

a substance (物质). For example, its

colour or state (solid, liquid or gas).

physical properties1
Physical Properties

Physical properties are ways to describe

a substance (物质). For example, its

colour or state (solid, liquid or gas).

there are two ways to measure physical properties qualitative and quantitative
There are two ways to measure physical properties: qualitative and quantitative.

Qualitative properties we can see

but we can’t measure.

Quantitative properties was can see

and measure (with numbers)

there are two ways to measure physical properties qualitative and quantitative1
There are two ways to measure physical properties: qualitative and quantitative.

Qualitative properties we can see

but we can’t measure.

Quantitative properties we can see

and measure (with numbers)

quantitative properties density freezing melting point b oiling point kaishuidedian solubility
Quantitative Properties- Density- Freezing/melting point- Boiling point (kaishuidedian)- Solubility (可溶性)
elements
Elements

An element is a pure substance that

can’t be made into smaller parts.

Au

O

compound
Compound

A pure substance made from more than

one element.

Water is hydrogen

(H) and oxygen (O):

H2O.

solutions and reactions
Solutions and Reactions

Solutions and reactions are not pure

substances.

solutions or reactions
Solutions or Reactions

If we put two (or more) elements or

compounds together sometimes they just sit together, that is a “Solution”.

solution or reaction
Solution or Reaction

If we put two (or more) elements or

compounds together sometimes they

make a chemical reaction.

pure substances
Pure Substances

Pure substances are made from only

one kind of matter (thing).

There are two kinds of pure substances:

Elements and Compounds

pure substances1
Pure Substances

Pure substances are made from only

one kind of matter.

There are two kinds of pure substances:

Elements and Compounds

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