BCLN Science 7 - Rev. Sept/2015
Unit 5 ~ Learning Guide Name: ______________________________
Instructions:
Using a pencil, complete the following notes as you work through the related lessons. Show ALL work as is explained in the lessons. You are required to have this package completed BEFORE you write your unit test. Do your best and ask questions if you don’t understand anything! Particle Model Questions
1. What is matter made up of?
2. What are the 4 main ideas in the particle model of matter?
The Particle Model of Matter
1.
2.
3.
4.
3. Illustrate how particles look in their different states. Write one sentence that describes their
appearance and how they move. Use the information from your lesson and the video to
complete your diagrams.
Solid
Liquid
Gas
______________________
______________________
______________________
______________________
______________________
______________________
______________________
______________________
______________________
BCLN Science 7 - Rev. Sept/2015
4. Complete the following diagram on state change of matter.
5. Complete the following statements using the following vocabulary words.
shape
slowly
gains
particles
gas
gain
a) When matter changes state, it does not _____________________ or lose
__________________.
b) A liquid takes the _______________ of its container because the particles can move
more freely than in a solid.
c) As a liquid cools, the particles in the liquid lose energy and move more and more
________________.
d)
When a liquid _________________ heat energy, the particles move about more and
more quickly.
e) When particles in a liquid gain enough energy to break free from other particles, the
liquid is changing into a __________________.
BCLN Science 7 - Rev. Sept/2015
6. What is sublimation? Give an example.
7. Complete the chart below by writing yes or no in each space.
State
Fixed mass?
Fixed volume? Fixed shape?
Solid
Liquid
Gas
Chemical or Physical Questions
1. What are some hints to help you determine if a physical or a chemical change has occurred?
List three hints for each one.
Physical Change Hints
Chemical Change Hints
1.
1.
2.
2.
3.
3.
BCLN Science 7 - Rev. Sept/2015
2. Complete the following table with information from the reading.
Physical
Change
Definition:
Examples:
Chemical
Change
Definition:
Examples:
Reversible
Change
Definition:
Examples:
Non
Reversible
Change
Definition:
Examples:
Chemical Changes Questions
1. What are some characteristics of matter?
2. How is a forest fire an example of a chemical change? What are some specific clues that
support your answer?
3. What happens when a substance rusts?
BCLN Science 7 - Rev. Sept/2015
4. Determine if the reaction listed below is physical or chemical. Justify your response from
your previous knowledge.
Reaction
A steak is well cooked
A piece of chalk is
crushed
The filament inside a
light bulb gets hot
and glows when an
electric current
moves through it
Frost forms on the
inside of a freezer
A green coating forms
on a copper statue
exposed to air.
Bread dough rises
when left in a
warm place.
butter melts on toast
lemonade powder is
mixed with water
Food scraps are turned
into compost
Coffee beans are
ground
Physical
or
Chemical
Reason
BCLN Science 7 - Rev. Sept/2015
Answer Key
Particle Model Answers:
1. Matter is made up of tiny particles.
2.
The Particle Model of Matter
1. all matter is made up of particles that are too small to see
2. the particles are always moving
3. the particles have space between them
4. at higher temperatures the particles move faster
3.
Solid
The particles are close together
and can't move very much.
Liquid
The particles have a bit more
space between them.
Gas
The particles in a gas have lots of
space between them and can
move quite freely around.
4.
5. Answers are in bold.
a) When matter changes state, it does not gain or lose particles.
b) A liquid takes the shape of its container because the particles can move more freely than
in a solid.
c) As a liquid cools, the particles in the liquid lose energy and move more and more slowly.
d) When a liquid gains heat energy, the particles move about more and more quickly.
e) When particles in a liquid gain enough energy to break free from other particles, the
liquid is changing into a gas.
BCLN Science 7 - Rev. Sept/2015
6. Sublimation is when a substance changes states but skips a state, for example solid to gas.
An example of a substance that goes through sublimation is dry ice, it changes from solid to
its gas form without moving into its liquid state.
7.
State
Fixed mass? Fixed volume? Fixed shape?
Solid
Yes
Yes
Yes
Liquid
Yes
Yes
No
Gas
No
No
No
Chemical or Physical Answers:
1.
Physical Change Hints
1. No change in colour
Chemical Change Hints
1. Bubbles given off
2. Reversible
2. Sound or heat given off
3. No heat, bubbles given off, no solid
particles formed
3. Solid particles formed
2.
Physical
Change
Definition: A change in the substances' state, usually reversible.
Examples: A change in state like, water freezing or a piece of paper ripping.
Chemical
Change
Definition: You ended up with something different than what you started out with.
Examples: Burn a piece of paper you end up with carbon and no more paper, most
chemical reactions are not reversible.
Reversible
Change
Definition: Can be put back into its original form.
Examples: Mixing juice crystals with water, you can evaporate the water and you are
left with your original drink crystals.
Non
Reversible
Change
Definition: Cannot be put back into its original form.
Examples: A burnt piece of paper cannot be put back together.
Chemical Changes Answers:
1. Some characteristics of matter are that it undergoes chemical changes but never disappears.
2. A forest fire an example of a chemical change because the original matter (wood, trees)
produces heat and is changed into a new form carbon and ash. The reaction is nonreversible.
BCLN Science 7 - Rev. Sept/2015
3. Rusting is a chemical reaction between iron, water, and oxygen. It causes the metal to rust
or oxidize. It is non-reversible.
Physical or Chemical
Reason
Reaction
Cannot be reversed,
change in colour
A steak is well cooked
Chemical
A piece of chalk is
crushed
Physical
It can be reversed,
not altered
The filament inside a
light bulb gets hot
and glows when an
electric current
moves through it
Physical
Original substance not
changed, reversible
Frost forms on the
inside of a freezer
Physical
A green coating forms
on a copper statue
exposed to air.
Chemical
Bread dough rises when
left in a warm place.
Chemical
butter melts on toast
Physical
lemonade powder is
mixed with water
Physical
Can be reversed
Food scraps are turned
into compost
Chemical
Scraps give off heat , new
substance
Coffee beans are ground
Physical
Can be reversed
It is oxidized, a reaction with
moisture and oxygen
Created a new substance
Original form not changed
Original substance has not
changed