review of types of change. types of change reactants: zn + i 2 product: zn i 2
TRANSCRIPT
Review of Types of ChangeReview of Types of Change
Types of ChangeTypes of Change
Reactants: Zn + IReactants: Zn + I22 Product: Zn IProduct: Zn I22
Types of ChangeTypes of Change::At the conclusion of our time together, At the conclusion of our time together,
you should be able to:you should be able to:
1.1. List the 3 types of change and List the 3 types of change and define each.define each.
2.2. Classify a change as to Classify a change as to nuclear, chemical or physical.nuclear, chemical or physical.
All You Really Need To Know All You Really Need To Know You Can Learn From Noah's Ark You Can Learn From Noah's Ark
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4. Don't listen to critics, just get on with 4. Don't listen to critics, just get on with what has to be done. what has to be done.
NuclearNuclear ChemicalChemical PhysicalPhysical
Types of ChangeTypes of Change
Protons&
Neutronschange
Bondsmade/ broken
Electrons exchanged
No change in atoms a phase change a density change
Change can be identified by their atoms.
NuclearNuclear
Nuclear ChangeNuclear Change
Change in the Gain or lose Protons , Neutrons,
Alpha, Beta particle Fission, Fusion, RadiationWe looked at these in the last unit
Change in the Gain or lose Protons , Neutrons,
Alpha, Beta particle Fission, Fusion, RadiationWe looked at these in the last unit
Proton Neutron
nucleusnucleus
PhysicalPhysical
Physical ChangePhysical Change
No change in atoms/molecules Phase change (gas, liquid, solid) Light emission/absorption Dissolving Electrons passing through metals
ChemicalChemical
Chemical ChangeChemical Change
Bonds are made / broken Change in oxidation states Bonds are made / broken Change in oxidation states
Cl-1 Cl-1
21
Li +1
Stand Up to Your Problems!!
Evidence of Chemical Change:Chemists Get Practice Trying Labs
change in color development of a gas formation of precipitate temperature change light
Evidence of Chemical Change:Chemists Get Practice Trying Labs
change in color development of a gas formation of precipitate temperature change light
NOT a Chemical Change:
sublimation crystalizationfluorescence
NOT a Chemical Change:
sublimation crystalizationfluorescence
Chemical Properties are Determined by Observing Chemical
Changes
Chemical Properties are Determined by Observing Chemical
Changes
Reactivity
Combustibility
Gas formation
Precipitate
Color change
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Chemical or Physical
Ice cubes float in water because:
a. The ice is losing mass through the melting processb. The colder ice is more densec. Liquid water is less dense than ice cubesd. The molecules of ice are arranged in an orderly way so that there is an unusually large amount of empty space in the ice cubes.e. None of the above
A hot air balloon rises because:
1. molecules become lighter when heated.
2. molecules move faster and farther apart when heated.
3. molecules are less attracted by gravity when heated.
4. molecules become charged and repel each other when heated.
Chemical or Physical
The solid, liquid, and gaseous states of water The solid, liquid, and gaseous states of water differ from each other in:differ from each other in:
the mass of the individual atoms. the mass of the individual atoms.
the size of the individual atoms. the size of the individual atoms.
the net electrical charge of the individual the net electrical charge of the individual molecules. molecules.
the average speed of movement of the the average speed of movement of the individual molecules. individual molecules.
The solid, liquid, and gaseous states of water The solid, liquid, and gaseous states of water differ from each other in:differ from each other in:
the mass of the individual atoms. the mass of the individual atoms.
the size of the individual atoms. the size of the individual atoms.
the net electrical charge of the individual the net electrical charge of the individual molecules. molecules.
the average speed of movement of the the average speed of movement of the individual molecules. individual molecules.
Chemical or Physical
If you saw an ice cube sink after it was placed in what you thought was a glass of water, which question should you probably ask?
1. What kind of liquid is in the glass?
2. Will the ice melt slower or quicker?
3. How fast did the ice cube sink?
4. How soon would the ice cube start to float?
If you saw an ice cube sink after it was placed in what you thought was a glass of water, which question should you probably ask?
1. What kind of liquid is in the glass?
2. Will the ice melt slower or quicker?
3. How fast did the ice cube sink?
4. How soon would the ice cube start to float?
Chemical or Physical
Interesting Signs:Interesting Signs:
What will happen if you mix vinegar and baking What will happen if you mix vinegar and baking soda?soda?
1.1. It will explode. It will explode.
2.2. Nothing will happen. Nothing will happen.
3.3. It will bubble up rapidly. It will bubble up rapidly.
4.4. It will turn bright red. It will turn bright red.
What will happen if you mix vinegar and baking What will happen if you mix vinegar and baking soda?soda?
1.1. It will explode. It will explode.
2.2. Nothing will happen. Nothing will happen.
3.3. It will bubble up rapidly. It will bubble up rapidly.
4.4. It will turn bright red. It will turn bright red.
Chemical or Physical
When a gas forms a liquid, which process is taking place?
1. freezing
2. condensation
3. boiling
4. evaporation
Chemical or Physical
Based on the melting points shown in the table, which material would still be a solid at 400°C?
1. beeswax
2. gold
3. lead
4. oxygen
Based on the melting points shown in the table, which material would still be a solid at 400°C?
1. beeswax
2. gold
3. lead
4. oxygen
Substance Melting Point (°C)
Beeswax 62
Gold 1,063
Lead 327
Oxygen –218
Substance Melting Point (°C)
Beeswax 62
Gold 1,063
Lead 327
Oxygen –218
Chemical or Physical
A chemical change for a piece of metal would be
1. being bent in half.
2. getting cut into two pieces.
3. being painted.
4. getting rusty.
Design a Hypothesis
Types of ChangeTypes of Change::
Let’s see if you can:Let’s see if you can:
1.1. List the 3 types of change and List the 3 types of change and define each.define each.
2.2. Classify a change as to Classify a change as to nuclear, chemical or physical.nuclear, chemical or physical.
You get up in the morning and make toast for breakfast. You notice the color changes from light to dark. Later on that day in science class, your teachers asks for every day examples of physical and chemical changes.
Should you volunteer your toast as an example of a physical or chemical change?
Why?
Chemical or Physical
Lucy noticed that her coin collection had begun to tarnish. Some of the metal in the coins had begun to change color. The formation of tarnish is most similar to which of the following changes?
1. shredding a piece of paper into hundreds of tiny strips
2. dropping a dinner plate on the floor
3. melting ice cubes in a glass of juice
4. burning a piece of paper to ashes in a fireplace
Lucy noticed that her coin collection had begun to tarnish. Some of the metal in the coins had begun to change color. The formation of tarnish is most similar to which of the following changes?
1. shredding a piece of paper into hundreds of tiny strips
2. dropping a dinner plate on the floor
3. melting ice cubes in a glass of juice
4. burning a piece of paper to ashes in a fireplace
Chemical or Physical
Mr. T performed a chemical reaction for the class. Which of these does NOT show evidence that a chemical reaction has occurred ?
Change in color
Change in shape
Formation of gas
Formation of a precipitate
Mr. T performed a chemical reaction for the class. Which of these does NOT show evidence that a chemical reaction has occurred ?
Change in color
Change in shape
Formation of gas
Formation of a precipitate
Which picture shows only a physical change in the wood?
Which action would result in a chemical change?
crumpling several sheets of paper
pounding a nail into a piece of wood
peeling and slicing a carrot
making blueberry muffins
What Kind of a Change is This?
Precipitate is the formation of insoluble molecular
compounds.
What Kind of a Change is This?
Precipitate is the formation of insoluble molecular
compounds.Does NOT dissolve in water.
Chemical
A different chemical substance is formed when a:
A different chemical substance is formed when a:
piece of cloth is cut.
cup breaks.
candle burns.
piece of chalk breaks.
Which is an example of a chemical change?
• ice melting
• salt crystals being ground to powder
• water evaporating
• wood burning
Which is an example of a chemical change?
• ice melting
• salt crystals being ground to powder
• water evaporating
• wood burning
Familiar SayingFamiliar Saying
Supposing one primarily fails to be victorious, bend further efforts in the
direction.
If at first you don’t succeed, try, try again!!