 |
Section 1
Measuring Motion
What You Will Learn
"Look around you—you are likely to see something in motion. Your teacher may be walking across the room, or perhaps your friend is writing with a pencil."
"Even if you don’t see anything moving, motion is still occurring all around you. Air particles are moving, the Earth is circling the sun, and blood is traveling through your blood vessels!"
Observing Motion by Using a Reference Point
"You might think that the motion of an object is easy to detect—you just watch the object. But you are actually watching the object in relation to another object that appears to stay in place. The object that appears to stay in place is a reference point. When an object changes position over time relative to a reference point, the object is in motion. You can describe the direction of the object’s motion with a reference direction, such as north, south, east, west, up, or down".What is a reference point? |
jueves, 14 de marzo de 2013
Matter in Motion
Motion and forces
Motion and Forces
"It’s hard to imagine a world where nothing ever moves. Without motion or forces to cause motion, life would be very dull! The relationship between force and motion is the subject of this unit. You will learn how to describe the motion of objects, how forces affect motion, and how fluids exert force. This timeline shows some events and discoveries that have occurred as scientists have worked to understand the motion of objects here on Earth and in space".
Bibliography:
http://my.hrw.com/tabnav/controller.jsp?isbn=0030462495 |
miércoles, 6 de marzo de 2013
Science Fair
SIMON
GALINDO AND MATIAS LOPERA.
7A
VERMONT
SCHOOL
CAN THE
PLANTS INCLINE TO THE MAGNETS AND IT CAN AFFECT THE GROWTH OF THE PLANT?
VERMONT
SCHOOL
Biology
7A
By
SIMON
GALINDO ZULUAGA AND MATIAS LOPERA.
Medellín,
Antioquia
05/05/2013
CAN THE
PLANTS INCLINE TO THE MAGNETS AND IT CAN AFFECT THE GROWTH OF THE PLANT?
Introduction….
Most
of the plants need soil, water and sun light to grow normal and healthy, but
can we affect that growing for doing better? In this project we are going to
see if magnetism can affect plants growth for good, to see if with these
magnets we can do the growth process of the plant better by doing it faster and
healthier. COME HERE AND LEARN!!!!
Theoretical Background
1.Magnetism:
“Magnetism
is the force generated by any moving charged particle or charged particles. A
magnetic field is the result of the motion of a charged particle or charged
particles, and this field is generated in no other way. Any time a charged
particle moves, it creates a magnetic field around its path of travel. There
are no exceptions that we know of. Magnetism is a term that speaks to the
phenomenon associated with a magnetic field and with its action on other
things”
“The
creation of a magnetic field by a moving charge or moving charges is this
fundamental concept that is behind the term electromagnetic force, which is one
of the four fundamental forces in the universe. Electricity and magnetism are
tied together inextricably because of this it produce energy”
The
magnetism is the force in which an object is attracted to one other. Every
magnet has two poles. These poles are called north and south or north-seeking
and south seeking poles. When the south poles of two magnets are placed near
one another, they also are repelled from one another. When the north and south
poles of two magnets are placed near one another, they are attracted to one
another.The magnetism is caused because the magnetic field.
2. Magnetic force:
The
magnetic field of an object can create a magnetic force on other objects with
magnetic fields. That force is what we call magnetism.
When
a magnetic field is applied to a moving electric charge, such as a moving
proton or the electrical current in a wire, the force on the charge is called a
Lorentz force.
3. Does magnetism affect
plants growth?:
“A
study was conducted to test the hypothesis that a magnetic field can affect
plant growth and health. The study divided plants into three groups. The first
group of plant seeds grew in a low magnetic field. The second group grew in a
high magnetic field. The third group grew in the absence of a magnetic field,
serving as a control group. Several growth parameters were measured, including
the germination rate, plant height, and leaf size”
“In
addition, the health status was measured by leaf color, spots, the stem
curvature, and the death rate. Plant growth was observed continuously for four
weeks. The results showed that magnetism had a significant positive effect on
plant growth. Plant seeds under the influence of the magnetic field had a
higher germination rate, and these plants grew taller, larger, and healthier
than those in the control group. No adverse effects of magnetism on plant
growth were noticed. However, the removal of the magnetic field weakened the
plant stem, suggesting the role of magnetism in supplying plants with energy”
4. How do plants grow and change?
4.1.
Plants need some primary needs to grow and change: They are water and sunlight.
4.2.
The plants start off as a seed and then slowly develop into a seedling. During
this moment the embryo help the seed to supply food.
4.3.
Later the seed make the root grow. They need also carbon dioxide and oxygen to
grow. After a long time, with good conditions for the plant, the stem and the
leaves will appear.
1.
Objectives
a)
To
see if plants can grow with magnetism and how affect?
b)
Know
more about the plants and their growth.
c)
Have
a good time with a funny project.
d) Increase our
knowledge.
e)
See
if our plant changes using magnetism.
f)
See
if our plant inclines to the magnet.
2.
Materials
and Reactives
|
Pots (3)
|
|
Bean seeds(2)
|
|
Mandarin seed(1)
|
|
Magnets (2)
|
|
Ruler of about 30 cm. (1)
|
|
Reactives
|
|
Sunlight
|
|
Water
|
|
Soil
|
|
|
3. Procedure
1.
Get
all the materials.
2.
Place
soil in the three pots.
3.
Plant
the three seeds in the three pots.
4.
Place
them in a wall because in a wall they will be protected of the cold.
5.
Put
the magnets in front of two pots.
6.
They
will have the same condition.
7.
Put
them in the sun light and give them water.
8.
Wait
about 5 days and see if they have growth.
9.
Record data and take pictures of the project.
4. Observations and Results
1.
The
first three days the seeds were exactly the same.( see on the appendix the
graph of the plants growth)
2.
The
fourth day the seed starts to get crease
3.
In
a week the seeds that have the magnets start to grow faster.
4.
The
bean seeds start to take out the roots but the mandarin deeds doesn't grow so
much.
5.
The
climate on “EL RETIRO” affect the plant growth, so maybe that is another cause
of the plant has not grown much ( The
three plants )
5. Conclusions
1. We could say that the magnets
help the plant to grow up faster and healthier.
2. We could say that the magnets
affects the plants growth for good.
3. We reach all our objectives.
4. We have fun with this project.
5. The plants can incline to the
magnets because of the energy that produce it.
References:
3.
3.http://www.selah.k12.wa.us/SOAR/SciProj2
Lab Report
Finding
the density of two coins on the virtual lab on Vermont School and cleaning a
rare, valuable coin and also identify the physical and chemical changes,
process and properties with three
diferents coins
Simón Galindo ,7-A
Vermont School
Finding
the density of two coins on the virtual lab on Vermont School and cleaning a
rare, valuable coin and also identify the physical and chemical changes,
process and properties with three
diferents coins
Colegio
Gimnasio Vermont Medellín
Biology
Stage
Grade
By
Simón
Galindo Zuluaga
Medellín,
Antioquia
20/02/2013
Finding
the density of two coins on the virtual lab on Vermont School and cleaning a
rare, valuable coin and also identify the physical and chemical changes,
process and properties with three
diferents coins
Introduction….
In
this Apa Template we are going to find the density of two coins. We are going
to know more about the chemical and physical properties,processes and changes.
Also, we are going to know the Atomic Model through history and learn: How you
can reach the density of an object?Also we are going to know why cleaning rare
coins is a bad idea!!!!!!!!!!Also we are going to
identify the physical and chemical changes, process and properties with three
different coins.
Theoretical Background
1Physical
and chemical properties
1.1Physical property:
Is a characteristic of a substance that does not involve a chemical change,
such as density, color, or hardness.
1.2Chemical property: Is a property of matter that describes a substance's ability to participate in chemical reactions. |
2.Chemical
Reaction
A reaction in which one or more substances
are converted into different substances. The reactants are the starting
materials in a chemical reaction. The products are the substances that are
formed by a chemical reaction.
3.Physical
and chemical
A physical change is a change of matter from one form to another without a change in chemical properties.
A chemical change is a change that occurs when one or more substances change into entirely new substances with different properties.
4.Physical Processes
4.1Distillation
Distillation is a water purification process that
uses a heat source to vaporize water and separate it from contaminants. The
water is heated at 100 degrees and evaporated, vapors go to the cooler, cool
and condense, passing again to the liquid state.
4.2Evaporation
Is the process in which water converts in vapor, by
first boiling and then changing state? The temperature has to raise the boiling
point (100ºC) because it takes more time to evaporate, because affect the mass,
density and volume of the water.
4.3Filtration
Consists on separate solid residues or matter from
water by passing the material at a low speed, permitting liquid to pass and
leaving residues in the filter.
5.Chemical Process
5.1Combustion:
Combustion reactions always involve molecular
oxygen O2. Anytime anything burns (in the usual sense), it is a combustion
reaction. Combustion reactions are almost always exothermic (i.e., they give
off heat). For example when wood burns, it must do so in the presence of O2 and
a lot of heat is produced.
5.2Neutralization:
“Neutralization reaction refers to acid and base
reaction producing salt and water. The equivalent amounts of acid react with
base to form equivalent amounts of salt and water. When the reaction is
complete, acid and base are said to neutralize each other. Since water is
produced, neutralization reaction is also referred as “water forming reaction”.
5.3Electrolysis:
“Process by which electric current is passed
through a substance to effect a chemical change. The chemical change is one in
which the substance loses or gains an electron (oxidation or reduction).The
process is carried out in an electrolytic cell, an apparatus consisting of
positive and negative electrodes held apart and dipped into a
solution containing positively and negatively charged ions”
5.4Corrosion:
“Is the loss of metallic properties of a metal as
the metal reacts with the atmosphere or water. e.g. strength, luster or shine
and electrical conductivity. Rust is brownish red in color and is formed from
the corrosion of iron. Other metals like copper and aluminum also corrode or
weaken. For corrosion to occur both water and oxygen need to be present”
6.Density
Density is a
physical property of matter, as each element and compound has a unique density
associated with it. Density defined in a qualitative manner as the measure of
the relative "heaviness" of objects with a constant volume.
Equation:
7.Matter
Matter is all surrounding you, that have a volume, weight and mass.
8.Volume
Volume is the amount of space taken up or
occupied by an object..
Equation:
Mass/Density.
9.Weight
Gravity acting over all the matter and energy
in our planet is call weight.
10.Mass
Mass is the amount of matter that something
is made of.
Equation:
Density X Volume.
11.Energy
All surrounding you, that don’t have volume,
weight and mass.
Equations
1: 9.8 m/s=Per second
Equation
2:
12.Atom
Atom is the name that means ”Without
division”.
13,Atomic
Models
13.1John
Dalton :
Dalton
proposed a modern atomic model based on experimentation not on pure
reason, he also said:
1. All matter is made of atoms.
2. Atoms of an element are identical.
3. Each element has different atoms.
4. Atoms
of different elements combine in constant ratios to form compounds.
5. Atoms
are rearranged in reactions.
13.2Ernest
Rutherford:
Most particles passed through. So, atoms are mostly empty. Some positive
α-particles deflected or bounced back! Thus, a “nucleus” is positive &
holds most of an atom’s mass.
13.3BÖHR
Electrons orbit the nucleus in “shells”
Electrons can be bumped up to a higher
shell if hit by an electron or a photon of light , the Bohr model was a
one-dimensional model that used one quantum number to describe the distribution
of electrons in the atom.
There are 2 types of spectra: continuous
spectra & line spectra. It’s when electrons fall back down that they
release a photon. These jumps down from
“shell” to “shell” account for the line spectra seen in gas discharge tubes
(through spectroscopes).
13.4
J.J THOMPSON:
He discover that electrons are negative
charged part of every atom, he also discovered that atoms are positive and that
are spread together in the atom, like a cloud.
13.5
ERWIN SCHRÖDINGER:
Schrödinger combined the equations for the
behavior of waves with the de Broglie equation to generate a mathematical model
for the distribution of electrons in an atom, this models contains Mathematical Equation Know as wave function
that can know the behavior of electrons , this model based on waves that why
this model is called Wave Function.
1. Objectives
a) Learn more about chemical and physical Properties, Changes and
processes.
b) Know more about different equations to find Density, Mass and Volume.
c) Find the coin with most density.
d) Have fun with this new activity.
e) See why cleaning rare coins is a bad
idea.
f)
Identify
the physical and chemical properties on a coin but using acids.
2. Materials and Reactives
Materials
and Reactives in both stages:
Materials
|
Reactives
|
Virtual Coins.
|
Virtual Water
|
Computer.
|
|
Balance.
|
|
Graduate.
|
|
Virtual gloves,
virtual glasses and virtual lab coat.
|
|
Calculator
|
|
And the physical
lab:
Materials
|
Reactives
|
Gloves
|
HcL(Hylocrolic Acid)
|
Glasses
|
|
Lab coat
|
|
Balance
|
|
Coins
|
|
Graduate
|
|
3. Procedure
Stage 1
1. Click on the coin A and put it on the balance for finds its mass.
2. Copy the mass.
3. Measure the water level on the graduate.
4. Then put coin A and copy he last volume.
5. Do the same with coin B.
6. Make the procedure of density.
Stage 2
1.Click on the lab coat,glosses
and safety glosses,Then ,click Enter.
2.Move your pointer over a labeled
cointainer to learn more about the cleaning substance.
3.Click the first coin on the left
side of the screen.Carefully observe the way the coin looks before cleaning.
4.Click Continue to begin the
cleaning process.
5.Carefully observe the coin after
the cleaning takes place, and then click Continue.
6.You can use the Close-up button
on the left at any time to see how the coin looked before cleaning.Use the
Close-up button on the right to see how a coin looks after a cleaning.
7.Repeat step 3.6 for the second
and third coins.
8.Answer the questions,and then
Evaluate.
Physical lab report
1.
Mix all the substances that I say in
the Table in Observations and observe and take note.
4.
5. Observations and Results
Results
Stage 1
Samples
|
Mass (g)
|
Water level (ML)
|
Water level(ML)
|
Volume(cm3)
|
Coin A
|
26.7(g)
|
50.0
|
52.6 (ML)
|
2.6 (cm3)
|
Coin B
|
26.3(g)
|
50.0
|
52.8(ML)
|
2.8(cm3)
|
Density/Coin
A= 26,7g/2,6 cm3= 10,26 g/cm3.
Density/Coin
B= 26,3g/2,8 cm3= 9,39 g/cm3.
R//So the COIN A has more density than
the COIN B.
Observations:
1. The coin A has more density than B.
2. Both coins are beautiful.
Stage 2
Observations
a)First ,putting hydrogen sulfide solution to the coin A
coverted like more dark and changed a lot and also decrased his density.
b)Then, mixing Sodioum hypocholorite to Coin
B the coin B changed it color like a rainbow
c) Finally, mixing baking soda to Coin C,Coin
C looked more bright and cleaner than when it was before.
Physical Lab
Test tube.
|
Substance.
|
Reactivity.
|
Observations.
|
A
|
CUSO4
|
HcL[ ]
|
It got bubbles, it turned blue and break.
|
B
|
CUSO4
|
NaoH
|
Bubbles, hot, smoke, break, blue.
|
C
|
CUSO4
|
NH3
|
Bad smell, green and cold down-
|
A
|
Zn
|
HcL[ ]
|
It haved an very awfull or disgustion smell and
smoked.
|
B
|
Zn
|
NaoH
|
It only disolves
|
C
|
Zn
|
NH3
|
It haved an hard smell and it was cold.
|
A
|
S
|
HcL[ ]
|
Above hot, down cold, smoke, transparent, grey and
it was really hot.
|
B
|
S
|
NaoH
|
It was cold,it was dark blue and have an neutral
smell.
|
C
|
S
|
NH3.
|
It was cold and warm and it have an light blue
color.
|
6. Conclusions
i)
The coin A is denser than the coin B.
ii) We have reached all owr objectives.
iii) We have increased owr knowledge
with physical and chemical changes, processes and properties.
iv) Now we know how to know the density of an object,the mass of an object and the volume of a object using
owr Formules.
v) I haved fun with this didactic
activity.
vi) Cleaning rare coins is a bad idea.
vii) In stage 2,the change is physical.
viii)
It are many chemical changes or physical changes
when we mix something.It can change the color,smell,the coldeness or the hotness,the
produce of bubles,etc…..
References
7.
Appendix
Finding the density of two coins on the virtual lab on Vermont School and cleaning a rare, valuable coin and also identify the physical and chemical changes, process and properties with three diferents coins
Simón Galindo ,7-A
Vermont School
Finding the density of two coins on the virtual lab on Vermont School and cleaning a rare, valuable coin and also identify the physical and chemical changes, process and properties with three diferents coins
Colegio Gimnasio Vermont Medellín
Biology
Stage Grade
By
Simón Galindo Zuluaga
Medellín, Antioquia
20/02/2013
Finding the density of two coins on the virtual lab on Vermont School and cleaning a rare, valuable coin and also identify the physical and chemical changes, process and properties with three diferents coins
Introduction….
In this Apa Template we are going to find the density of two coins. We are going to know more about the chemical and physical properties,processes and changes. Also, we are going to know the Atomic Model through history and learn: How you can reach the density of an object?Also we are going to know why cleaning rare coins is a bad idea!!!!!!!!!!Also we are going to identify the physical and chemical changes, process and properties with three different coins.
Theoretical Background
1Physical and chemical properties
1.1Physical property: Is a characteristic of a substance that does not involve a chemical change, such as density, color, or hardness.
1.2Chemical property: Is a property of matter that describes a substance's ability to participate in chemical reactions.
2.Chemical Reaction
A reaction in which one or more substances are converted into different substances. The reactants are the starting materials in a chemical reaction. The products are the substances that are formed by a chemical reaction.
3.Physical and chemical
A physical change is a change of matter from one form to another without a change in chemical properties.
A chemical change is a change that occurs when one or more substances change into entirely new substances with different properties.
4.Physical Processes
4.1Distillation
Distillation is a water purification process that uses a heat source to vaporize water and separate it from contaminants. The water is heated at 100 degrees and evaporated, vapors go to the cooler, cool and condense, passing again to the liquid state.
4.2Evaporation
Is the process in which water converts in vapor, by first boiling and then changing state? The temperature has to raise the boiling point (100ºC) because it takes more time to evaporate, because affect the mass, density and volume of the water.
4.3Filtration
Consists on separate solid residues or matter from water by passing the material at a low speed, permitting liquid to pass and leaving residues in the filter.
5.Chemical Process
5.1Combustion:
Combustion reactions always involve molecular oxygen O2. Anytime anything burns (in the usual sense), it is a combustion reaction. Combustion reactions are almost always exothermic (i.e., they give off heat). For example when wood burns, it must do so in the presence of O2 and a lot of heat is produced.
5.2Neutralization:
“Neutralization reaction refers to acid and base reaction producing salt and water. The equivalent amounts of acid react with base to form equivalent amounts of salt and water. When the reaction is complete, acid and base are said to neutralize each other. Since water is produced, neutralization reaction is also referred as “water forming reaction”.
5.3Electrolysis:
“Process by which electric current is passed through a substance to effect a chemical change. The chemical change is one in which the substance loses or gains an electron (oxidation or reduction).The process is carried out in an electrolytic cell, an apparatus consisting of positive and negative electrodes held apart and dipped into a solution containing positively and negatively charged ions”
5.4Corrosion:
“Is the loss of metallic properties of a metal as the metal reacts with the atmosphere or water. e.g. strength, luster or shine and electrical conductivity. Rust is brownish red in color and is formed from the corrosion of iron. Other metals like copper and aluminum also corrode or weaken. For corrosion to occur both water and oxygen need to be present”
6.Density
Density is a physical property of matter, as each element and compound has a unique density associated with it. Density defined in a qualitative manner as the measure of the relative "heaviness" of objects with a constant volume.
Equation:
7.Matter
Matter is all surrounding you, that have a volume, weight and mass.
8.Volume
Volume is the amount of space taken up or occupied by an object..
Equation: Mass/Density.
9.Weight
Gravity acting over all the matter and energy in our planet is call weight.
10.Mass
Mass is the amount of matter that something is made of.
Equation: Density X Volume.
11.Energy
All surrounding you, that don’t have volume, weight and mass.
Equations 1: 9.8 m/s=Per second
Equation 2:
12.Atom
Atom is the name that means ”Without division”.
13,Atomic Models
13.1John Dalton :
Dalton proposed a modern atomic model based on experimentation not on pure reason, he also said:
1. All matter is made of atoms.
2. Atoms of an element are identical.
3. Each element has different atoms.
4. Atoms of different elements combine in constant ratios to form compounds.
5. Atoms are rearranged in reactions.
13.2Ernest Rutherford:
Most particles passed through. So, atoms are mostly empty. Some positive α-particles deflected or bounced back! Thus, a “nucleus” is positive & holds most of an atom’s mass.
13.3BÖHR
Electrons orbit the nucleus in “shells” Electrons can be bumped up to a higher shell if hit by an electron or a photon of light , the Bohr model was a one-dimensional model that used one quantum number to describe the distribution of electrons in the atom.
There are 2 types of spectra: continuous spectra & line spectra. It’s when electrons fall back down that they release a photon. These jumps down from “shell” to “shell” account for the line spectra seen in gas discharge tubes (through spectroscopes).
13.4 J.J THOMPSON:
He discover that electrons are negative charged part of every atom, he also discovered that atoms are positive and that are spread together in the atom, like a cloud.
13.5 ERWIN SCHRÖDINGER:
Schrödinger combined the equations for the behavior of waves with the de Broglie equation to generate a mathematical model for the distribution of electrons in an atom, this models contains Mathematical Equation Know as wave function that can know the behavior of electrons , this model based on waves that why this model is called Wave Function.
1. Objectives
a) Learn more about chemical and physical Properties, Changes and processes.
b) Know more about different equations to find Density, Mass and Volume.
c) Find the coin with most density.
d) Have fun with this new activity.
e) See why cleaning rare coins is a bad idea.
f) Identify the physical and chemical properties on a coin but using acids.
2. Materials and Reactives
Materials and Reactives in both stages:
Materials Reactives
Virtual Coins. Virtual Water
Computer.
Balance.
Graduate.
Virtual gloves, virtual glasses and virtual lab coat.
Calculator
And the physical lab:
Materials Reactives
Gloves HcL(Hylocrolic Acid)
Glasses
Lab coat
Balance
Coins
Graduate
3. Procedure
Stage 1
1. Click on the coin A and put it on the balance for finds its mass.
2. Copy the mass.
3. Measure the water level on the graduate.
4. Then put coin A and copy he last volume.
5. Do the same with coin B.
6. Make the procedure of density.
Stage 2
1.Click on the lab coat,glosses and safety glosses,Then ,click Enter.
2.Move your pointer over a labeled cointainer to learn more about the cleaning substance.
3.Click the first coin on the left side of the screen.Carefully observe the way the coin looks before cleaning.
4.Click Continue to begin the cleaning process.
5.Carefully observe the coin after the cleaning takes place, and then click Continue.
6.You can use the Close-up button on the left at any time to see how the coin looked before cleaning.Use the Close-up button on the right to see how a coin looks after a cleaning.
7.Repeat step 3.6 for the second and third coins.
8.Answer the questions,and then Evaluate.
Physical lab report
1. Mix all the substances that I say in the Table in Observations and observe and take note.
5. Observations and Results
Results
Stage 1
Samples Mass (g) Water level (ML) Water level(ML) Volume(cm3)
Coin A 26.7(g) 50.0 52.6 (ML) 2.6 (cm3)
Coin B 26.3(g) 50.0 52.8(ML) 2.8(cm3)
Density/Coin A= 26,7g/2,6 cm3= 10,26 g/cm3.
Density/Coin B= 26,3g/2,8 cm3= 9,39 g/cm3.
R//So the COIN A has more density than the COIN B.
Observations:
1. The coin A has more density than B.
2. Both coins are beautiful.
Stage 2
Observations
a)First ,putting hydrogen sulfide solution to the coin A coverted like more dark and changed a lot and also decrased his density.
b)Then, mixing Sodioum hypocholorite to Coin B the coin B changed it color like a rainbow
c) Finally, mixing baking soda to Coin C,Coin C looked more bright and cleaner than when it was before.
Physical Lab
Test tube. Substance. Reactivity. Observations.
A CUSO4 HcL[ ] It got bubbles, it turned blue and break.
B CUSO4 NaoH Bubbles, hot, smoke, break, blue.
C CUSO4 NH3 Bad smell, green and cold down-
A Zn HcL[ ] It haved an very awfull or disgustion smell and smoked.
B Zn NaoH It only disolves
C Zn NH3 It haved an hard smell and it was cold.
A S HcL[ ] Above hot, down cold, smoke, transparent, grey and it was really hot.
B S NaoH It was cold,it was dark blue and have an neutral smell.
C S NH3. It was cold and warm and it have an light blue color.
6. Conclusions
i) The coin A is denser than the coin B.
ii) We have reached all owr objectives.
iii) We have increased owr knowledge with physical and chemical changes, processes and properties.
iv) Now we know how to know the density of an object,the mass of an object and the volume of a object using owr Formules.
v) I haved fun with this didactic activity.
vi) Cleaning rare coins is a bad idea.
vii) In stage 2,the change is physical.
viii) It are many chemical changes or physical changes when we mix something.It can change the color,smell,the coldeness or the hotness,the produce of bubles,etc…..
References
1.http://www.green-planet-solar-energy.com/hydrogen-electrolysis.html
2.http://cnx.org/content/m17138/latest/
3.http://www.iun.edu/~cpanhd/C101webnotes/chemical%20reactions/combustion.html
4.http://www.chemicalformula.org/chemistry-help/corrosion
5.http://www.historyofwaterfilters.com
6.http://my.hrw.com/sh2/sh07_10/student/flash/visual_concepts/75013.htm
7.http://my.hrw.com/sh2/sh07_10/student/flash/visual_concepts/75016.htm
8.http://my.hrw.com/sh2/sh07_10/student/flash/visual_concepts/75014.htm
9.http://my.hrw.com/sh2/sh07_10/student/flash/sample_problems/20021.htm
10.http://my.hrw.com/sh2/sh07_10/student/flash/virtual_investigations/hst/mat/hst_mat_vi.html
7. Appendix
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