Test Corrections
11/28/11
Catalyst
1. How did you prepare for the test?
2. What grade do you think you earned on
the test? Why?
Test Corrections and Analysis
Please follow the directions on the
worksheet. Do NOT write on the
worksheet! Complete in your notebook.
31L
Phase Changes
11/28/11
Catalyst
1. How does something change from a
liquid to a solid? What about from a liquid
to a gas?
Brainpop Video and Quiz
Watch the video and we will do the quiz
together.
32L
11/28/11
Phase Changes
Learning Target #5 (Reminder)
LT #5: I can describe the motion of particles
in a solid, liquid, and gas (including phase
changes).
32R
Phase Changes
11/28/11
Definitions
Physical change: any change that alters the
form or appearance of matter but does not
make any substance in the matter into a
different substance. Examples = melting an
ice cube, dissolving sugar in water
Chemical change: a change in matter that
produces one or more new substances.
Examples = rust, burning a substance
32R
Phase Changes
Physical or Chemical Change?
11/28/11
1. Drying wet clothes
Physical
2. Cutting snowflakes out of paper
Physical
3. Lighting a match
Chemical
4. Rust
Chemical
5. Boiling water
Physical
6. Breaking down water into hydrogen and oxygen
32L
Chemical
11/28/11
Phase Changes
Independent Reading and Notes p. 96
Read “Changes Between a Solid and Liquid.”
Answer the following questions
1. What is melting? A melting point?
2. What happens when a substance melts?
3. What is freezing?
4. What happens when a substance freezes?
5. What happens to the particles of a liquid
as they lose more and more energy?
32R
Phase Changes
Catalyst
1. What happens when the particles of a
solid vibrate so fast they break free?
The solid melts into a liquid.
32L continued
11/30/11
11/30/11
Phase Changes
Independent Reading and Notes p. 96
Read “Changes Between a Liquid and Gas.”
Answer the following questions
1. What is vaporization?
2. When does vaporization take place?
3. What are the 2 types of vaporization?
4. What is evaporation?
5. What is boiling? Boiling point?
6. What is condensation?
7. What happens during condensation?
32R continued
11/30/11
Phase Changes
Independent Reading and Notes p. 96
Read “Changes Between a Solid and Gas.”
Answer the following questions
1. What is sublimation?
2. What happens during sublimation?
3. What physical state is skipped during the
sublimation of a substance?
4. How is dry ice an example of
sublimation?
32R continued
11/30/11
Phase Changes
States of Matter Comparison Chart
Fill out the chart with a partner. Do NOT
write on the worksheet. Complete it in your
notebook. You will have 10 minutes to
work.
32L continued
Phase Changes
12/1/11
Catalyst
1. What is the opposite of vaporization
(boiling/evaporation)?
Condensation
2. What is sublimation?
The change from a solid directly into a gas.
3. If a solid changes into a liquid, which
phase change is this?
Melting
*Review States of Matter Comparison
Chart (Word doc)* 32L continued
Phase Changes
Key Definition
Deposition = the change from a gas to a
solid. The opposite of sublimation!
Our final phase change!!
32R continued
12/1/11
12/1/11
Phase Changes
Interpreting Phase Change Graphs
Turn to p. 100 and copy down the Changes
of States for Water graph at the top of the
page. Answer questions #1-5 in your
notebook.
Hints:
*The horizontal portions of the line
represent phase changes. Look at the
temperature (y-axis) at which this happens!
*The slanted portions of the line represent a
change in temperature.
32R continued
12/1/11
Phase Changes
Interpreting Phase Change Graphs: Answers
1. Temperature (◦C) is on the y-axis and time
(minutes) is on the x-axis.
2. The temperature is rising from 0◦C
to 100◦C.
3. Segment B is 0◦C and the melting point of
water. Segment D is 100◦C and the boiling
point of water.
4. Segment B is melting, or a change from a
solid to a liquid. Segment D is vaporization, or a
change from a liquid to32Ra continued
gas.
12/1/11
Phase Changes
Interpreting Phase Change Graphs: Answers
5. Water molecules in segment E have more
thermal energy because they are at a higher
temperature.
32R continued
12/1/11
Phase Changes
Phase Change Practice
1. Create an example of a phase change.
Question: “What happens when the
particles of a solid break free?”
Answer: Melting
2. You will ask your question to a partner
and they will ask you their question. Then,
switch partners!
3. You will have 7 minutes to walk around
the room and quiz each other. Quiz, quiz,
switch (partners)! 32L continued
12/1/11
Phase Changes
Self-Assess on LT #5
LT #5: I can describe the motion of particles
in a solid, liquid, and gas (including phase
changes).
Rate yourself on a 3, 2, 1 scale. Write it
down and hold up your fingers as well.
32L
--You will now take a quiz on the states of
matter and phase changes. Surprise! Good
luck.
--You will have about 20 minutes to
complete the quiz.
--Do NOT write on the quiz. Please use a
separate sheet of paper.
--If you are done early, please complete the
following book work:
Read Section 1 on p. 58-67.
--You will correct the quiz together
afterwards.
Quiz Grading
Put the number correct over 20.
16-20 = 5
12-15 = 4
8-11 = 3
4-7 = 2
0-3 = 1
Compounds
12/1/11
Catalyst
1. What is the difference between a
chemical and physical property? *Review!
Look back in your notes!
A physical property (luster, density, melting
point) can be observed without changing it
into another substance while a chemical
property (reactivity, flammability or ability
to be burned) describes its ability to change
into different substances.
33L
Compounds
12/1/11
Key Definitions
Review:
Molecule = 2 or more atoms bonded
together
Compound = 2 or more elements bonded
together
New:
Chemical bond = when atoms combine, a
force of attraction between 2 atoms, holds
atoms together in molecules and compounds
33R
12/1/11
Compounds
Class Reading p. 64-65
Answer the following questions:
1. What is a chemical formula?
A chemical formula represents a compound
and shows the elements in the compound as
well as the ratio of atoms.
*Example = CO2 for carbon dioxide with 1
carbon and 2 oxygen atoms and CO for
carbon monoxide with 1 carbon and 1
oxygen atom
33R
12/1/11
Compounds
Class Reading p. 64-65
Answer the following questions:
2. When elements chemically combine, what
do they form?
When elements are chemically combined,
they form compounds having properties that
are *different* from those of the
uncombined elements.
33R
12/1/11
Compounds
Class Reading p. 64-65
Answer the following questions:
3. Define mixture. What is true about the
properties of each substance in a mixture?
A mixture is made of 2 substances that are
together but not chemically combined. Each
substance in a mixture *keeps its individual
properties.* There is also no set ratio for the
substances in a mixture.
33R
12/1/11
Compounds
Class Reading p. 64-65
Answer the following questions:
4. What is the difference between a
heterogeneous and homogeneous mixture?
In a heterogeneous mixture, you can see the
different parts. In a homogeneous mixture,
you can’t see the different parts because
they are so evenly mixed.
33R
12/1/11
Compounds
Class Reading p. 64-65
Answer the following questions:
5. What is a solution? What is it an example
of?
A solution can be a mixture of liquids, solids,
or gases. It is an example of a homogeneous
mixture because you can’t see the different
parts.
33R
Compounds
Heterogeneous or Homogeneous?
Choose whether the example is heterogeneous or
homogeneous. Raise your hand for your answer:
Iced tea
Homogeneous
Sand and water
Heterogeneous
Coffee
Homogeneous
Air
Homogeneous
Salad
Heterogeneous
33L
12/1/11