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Physical and Chemicl Changes
Transcript of Physical and Chemicl Changes
SWBAT determine whether a reaction was a physical or a chemical change by looking at what was produced in an experiment.
You can distinguish the liquids by examining their PROPERTIES.
Properties of Matter
There are two types of properties.
A physical property is a characteristic that can be observed or measured without changing the identity of a substance.
Physical and Chemical Changes
There are 2 types of changes:
Physical and Chemical
You have a container of water and a container of motor oil. How can you decide which liquid is in each container?
Matter is everywhere.
Matter is anything that takes up space and has mass.
Matter is constantly experiencing both chemical and physical changes.
A chemical property is a characteristic that determines how a substance will interact with other substances during a chemical reaction.
SPI 0807.9.8 - Interpret the results of an investigation to determine whether a physical or chemical change has occurred.
Take 45 seconds to discuss with your neighbor. Be prepared to share your answers with the class.
A property is any characteristic that can be used to identify and describe matter.
Physical and Chemical
Physical Properties of Matter
•color: The pigment or shade
•conductivity: electricity to flow through the substance
•malleability: if a substance can be flattened
•luster: how shiny the substance looks
Chemical Properties of Matter
* ability to burn
* ability to rust
changes occur when matter changes its property but not its chemical nature.
Physical changes are considered to be:
: melting, freezing, condensing, boiling
: cutting, breaking, building
: mixing and dissolving (mixing with water
Chemical changes are changes matter undergoes when it becomes new or different matter.
Evidence of chemical change includes:
•A gas is produced (bubbles form)
•A precipitate forms
•A precipitate is a solid that forms when 2 liquids are mixed together
•Color changes (think of rust, or a rotten banana)
•Odor or taste changes (think of rotten food)
A chemical change occurs when fireworks are used. Fireworks are made of metals such as magnesium and copper. These change chemically as they light up the sky.
Is it a chemical or physical change?
Consider these two questions:
Did it change size, color, shape (Physical Change)?
Did it become different matter (Chemical Change)?
Wood Log Burning
Crushing an Aspirin
An egg breaking
An egg rotting
1. What tool do you use to find the mass of an irregular solid (ex: rock)?
2. What tool do you use to find the volume of an irregular solid (ex: rock)?
3. What tool do you use to find the weight of an irregular solid (ex: rock)?
4. Everything that has ____ and takes up space is considered to be made up of atoms.
1. Which of the following is an example of a physical change?
2. When water freezes it undergoes a
A. Physical change
B. Chemical change
3. Which of the following is an example of a chemical change?
A. Melting ice
B. Cutting a pizza
C. Toasting a marshmallow
4. Which one of the following is a chemical change?
A. Cutting a bar of sodium metal into pieces with a knife
B. Lard when heated changes to a liquid
C. A freshly cut apple turns brown
D. Mixing sugar and cinnamon
Think of ways that physical changes could occur to each of the following items.
A sheet of paper
An iron nail
Now, think of ways that a chemical change could occur to each of the items.
When a candle is lit, the wick burns, the wax melts, the candle changes shape, and the air around the candle heats up.
What is the chemical change that occurred?
What is the physical change that occurred?
1. A student is observing a chemical reaction that forms a liquid. Which tool should the students use to determine the volume of the liquid that is produced?
A. electronic balance
B. spring scale
D. graduated cyclinder
2. Which property of an object will be different on the moon than it is on the Earth?
A. chemical structure
C. pH level
3. Which is a chemical change?
A. melting an ice cube
B. dissolving sugar in boiling water
C. boiling an egg
D. crushing a can
4. The process of iron combining with oxygen to form rust is considered a chemical change because rust has
A. properties that differ from both iron and oxygen
B. greater chemical reactivity than oxygen
C. the same chemical composition as iron
D. a very high melting point
1. The chemical process of burning coal produces energy and ash. The ash produced is best described as a
A. new state of matter
B. new type of element
C. substance with properties identical to coal
D. substance with properties different from coal
2. A strip of magnesium burns at a temperature of about 2220 degrees Celsius. Burning magnesium produces a brilliant white light and leaes behind a white powder known as magnesium oxide . Which best explains why the burning of magnesium results in a chemical reaction.
A. A new substance is formed.
B. A temperature increase occurred.
C. The appearance of the magnesium strip changed.
D. The state of matter of the magnesium strip changed.
A video about chemical change and chemical reactions...
Write down 10 facts you learned in the video. Be ready for a quiz after the video.
True or False:
1. When something burns, heat and light are given off. T or F
2. When water is decomposed into hydrogen and oxygen, these gases cannot combine again to reform water. T or F
3. Electrical energy is required to decompose water into hydrogen and oxygen. T or F
4. A cold pack feels cold because the chemical reaction absorbs heat. T or F
5. The salt you put on your food is a compound made from two poisonous elements. T or F
6. When vinegar and baking soda combine, the chemical reaction absorbs energy. T or F
Chemical and Physical Changes
Part I: Sort the following verbs into chemical change or physical change categories.
Tear, Burn, Mix, Dissolve, Cook, Rust, Decompose, Squeeze, Explode, Divide
Part II: Write whether the following is a chemical or physical change
1. Chocolate chips are melted in a pot on the stove.
2. A rancher lights a brush pile on fire.
3. Before a basketball game, the ref uses an air pump to inflate the basketball.
4. A metal wagon is left outside in the rain and it rusts.
5. A woman puts unused vegetables and fruit scrapes into a compost pile where they decompose.
6. A furniture maker uses a piece of sandpaper to make a chair more smooth.
7. Before a child takes a bath, his mother mixes bubbles into the bath water
8. Water drops form on the outside of cold glass of lemonade that is sitting outside in the hot air.
Physical Change: Tear, Mix, Dissolve, Squeeze, Divide
Chemical Changes: Burn, Cook, Rust, Decompose, Explode
There are 7 signs that a chemical change has occurred.
1. Gas Created (Bubbles Created)
2. Color Change
3. Odor Change
4. Temperature Change
5. Precipitate Formed Sound
Sound is produced.
Light is produced.
1. Lighting a piece of wood on fire.
2. Mixing Baking Soda and Vinegar
3. A metal fence rusting
4. Baking a cake
5. A firework exploding
List the signs of a chemical change that occur in the following scenrios.
F.O.A. - 10/2/14
Classify the following changes as either chemical or physical.
Be able to justify your answer.
1. A match is lit
2. Food is chewed
3. A nail rusts
4. Gas is burned in a stove
5. Ice cream melts
Instructions: At each station, you are presented with a substance or process. You will be asked if it represents a chemical or physical change scenario and the reasons for your answer. The third “follow-up” question is directly related to the definitions or characteristics of physical and chemical changes.
Station 1: Halloween glo-sticks
Station 2: Melting Wax
Station 3: Leaves Decomposing
Station 4: Carving Pumpkin
Station 5: Striking the match
Station 6: Popcorn popping
Station 7: Calcite + HCl
Station 8: Dissolving sugar and water
Station 9: Alka-Seltzer
1. The snap in the stick is a
reaction caused by the mixing of two components. Descriptions of these materials may be found at the following sites: http://daily.stanford.org/Daily96-97/11-6-96/NEWS/NEWbug06.html
2. Burning candle is a
change. The wax is still wax; it is now in a liquid state of matter rather than a solid.
3. Leaf decomposition is a
change caused by chemical reactions within the leaf structure.
4. Pumpkin carving is a
change—the pumpkin is now just in pieces; it is still of its original composition.
5. Striking a match is a
change caused by the reaction of chemicals on the tip of the match head instigated by the friction between the match head and the surface.
6. Popcorn popping is a
change. It looks different but is the same thing.
7. Calcite + HCl is a
change. The bubbles result from the chemical reaction between HCl and CaCO3 (Calcite) to give Carbon Dioxide gas.
8. Dissolving sugar and water is a
change. The sugar macromolecules are broken down into smaller molecules; but their form remains the same, which is shown through the descriptive taste
9. Alka-Seltzer in water is a
change. The fizzing indicates a chemical change, and the substance dissolving does not maintain its original chemical structure.
Exit Ticket 9-30-14
1. A student observes actions that occurred in four different eggs. Which action describes only a chemical change?
A a cut up egg
B a stirred egg
C a rotting egg
D a dropped egg
2. A student applies heat to a solid substance. Which indicates that a chemical change occurred?
A. The substance becomes a liquid but solidiﬁes when cooled.
B. The substance changes color and stays that color when cooled.
C. The substance goes from liquid to gas very quickly.
D. The substance expands but stays the same color.
3. Which of these represents a chemical change?
A. A match is lit, creating a yellow-orange ﬂame.
B. A small piece of ice melts, changing from a solid to a liquid.
C. A ball of clay sinks in water, and ﬂ oats when reshaped.
D. A pot of water is heated to boiling, and evaporation occurs.
Do Now 10/1/14
1. A new substance is usually formed when two or more substances combine and form new
B. chemical bonds.
C. physical shapes.
2. A science teacher demonstrated physical and chemical changes by using a fork to hold a marshmallow over a lit candle.
Which observation is the best evidence of a chemical change?
A. Some candle wax melted.
B. Metal in the fork became warmer.
C. The marshmallow became sticky on the inside.
D. The marshmallow developed a brown crust on the outside
Video and Notes
Today we are going to review chemical and physical changes. You will fill in the guided notes as you watch the video. The notes can be used to help you study for the benchmark.
Let's Play Jeopardy
You will be divided up into 5 teams.
The team with the highest points wins.
Elect a team spokesperson.
Exit Ticket 10/1/14
1. A student observes that a gas is formed when chemical Y is added to chemical Z in the lab. The student’s observation of a new product being formed is the common outcome of all
A. physical changes.
B. chemical changes.
C. mass changes.
D. phase changes
2. Students heated a white solid. The solid produced a flame during the heating process. The product cooled into a black solid. Which statement best classifies this change?
A. The change was only physical because the heat produced a color change.
B. The change was only physical because the properties of the substance were permanently changed.
C. The change was only chemical because the substance remained in its original state.
D. The change was only chemical because a flame was produced.
3. Which process most likely produces a physical change, without a chemical change?
A. A solid is exposed to heat and transforms into a liquid.
B. Two liquids are mixed together and a solid forms in the solution.
C. A metal burns in air and produces a white powder.
D. A metal is exposed to water and becomes corroded.