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WorksheetsPhysical and Chemical Changes Review
Total questions: 109
Worksheet time: 1hrs 25mins
What is a physical change?
Changing the way a substance appears without changing its identity.
Changing the identity of a substance.
Creating a new substance.
None of the above.
Fill in the blank: Physical changes are typically _________.
reversible
irreversible
permanent
destructive
Which of the following is a characteristic of a physical change?
A) Change in chemical composition
B) Change in size, shape, or color
C) Formation of a new substance
D) Release of gas
What happens to the state of matter during a physical change?
It changes
It remains the same
It becomes a gas
It becomes a liquid
How does temperature affect a physical change?
It has no effect
It changes the temperature
It changes the chemical composition
It changes the texture
Which of the following is affected during a physical change?
Chemical bonds
Texture
Atomic structure
Molecular weight
What type of change is 'Pencil shavings'?
Physical change
Chemical change
Biological change
No change
What type of change is 'Torn Paper'?
Physical change
Chemical change
Biological change
No change
What type of change is 'Crushed ice'?
Physical change
Chemical change
Nuclear change
Biological change
What type of change is 'Sugar dissolved in water'?
Physical change
Chemical change
Nuclear change
Biological change
What type of change is 'Painting a wall'?
Physical change
Chemical change
Biological change
No change
Chemical Changes: A change that occurs that ______ the identity of a substance to change.
causes
prevents
ignores
enhances
Chemical Changes: Changes on a ______ level.
molecular
atomic
cellular
elementary
Chemical Changes: New substances with ______ properties are formed.
new
old
unchanged
similar
An unexpected new _________ appears is a chemical change.
color
shape
pattern
texture
Chemical changes are difficult or impossible to _________.
reverse
understand
predict
control
Is 'Wood burning' an example of a chemical change or a physical change?
Chemical Change
Physical Change
Is 'Metal rusting' an example of a chemical change or a physical change?
Chemical change
Physical change
Is 'Food digesting' an example of a chemical change or a physical change?
Chemical Change
Physical Change
Is 'Gasoline burning' an example of a chemical change or a physical change?
Chemical Change
Physical Change
Is 'Cake baking' an example of a chemical change or a physical change?
Chemical Change
Physical Change
What type of change is crumbling cookies an example of?
Chemical Change
Physical Change
Biological Change
None of the above
Which of the following is a sign of a chemical change?
Smoke or Fire
Melting Ice
Dissolving Sugar
Breaking Glass
Which of the following indicates a chemical change?
Bubbles or Fizzing
Cutting Paper
Boiling Water
Freezing Water
A sign of chemical change is an unexpected ______ change.
temperature
color
shape
size
What is an unexpected sign of chemical change related to color?
Unexpected Color Change or Rusting
Formation of Bubbles
Change in Temperature
Emission of Light
What forms as a result of a chemical change?
Precipitate or New Substance Formed
No Change
Physical Change
Evaporation
What happens at 310°F?
Water boils
Sugar caramelizes
Ice melts
Bread toasts
What is an example of an unexpected color change in a chemical reaction?
Melting ice
Fireworks
Boiling water
Freezing water
New molecules created in a chemical reaction can produce new colors because:
They absorb and emit light differently.
They change the temperature of the reaction.
They increase the reaction speed.
They decrease the pressure in the environment.
What happens during chemical bonding that affects the temperature of the surroundings?
A) Energy is released or absorbed
B) Energy is created
C) Energy is destroyed
D) Energy remains constant
Fill in the blank: Adding baking soda to vinegar causes the temperature to ________.
decrease.
increase.
remain the same.
fluctuate.
What is combustion?
A) A physical change
B) A chemical reaction between substances, usually including oxygen accompanied by giving off heat and/or light
C) A temporary change
D) A reversible change.
Fill in the blank: Combustion is a _______ change that cannot be undone.
permanent
temporary
reversible
minor
Which of the following is an example of combustion?
Ice melting
Wood burning
Water boiling
Salt dissolving
A precipitate in a chemical change is:
A solid formed from a solution
A gas released during a reaction
A liquid that evaporates
A color change in a solution
Which of the following is an example of a precipitate forming?
Water boiling
Milk souring
Ice melting
Sugar dissolving
What happens when gases produced in a chemical reaction are released?
A) Bubbles form
B) Color changes
C) Temperature decreases
D) Solid forms
Fill in the blank: An example of a chemical reaction where bubbles form is ________.
Alka-Seltzer.
Melting ice.
Boiling water.
Breaking glass.
What gas is released when vinegar reacts with baking soda? Fill in the blank: Vinegar + baking soda = release of _________.
Carbon Dioxide Gas
Oxygen Gas
Nitrogen Gas
Hydrogen Gas
Fill in the blank: Iron + Oxygen = ______.
rust
water
carbon dioxide
salt
What is formed when sodium reacts with chloride? Fill in the blank: Sodium + chloride = _______.
salt
water
sugar
oxygen
What is formed when silver reacts with sulfur in the air? Fill in the blank: Silver + sulfur in the air = _______.
tarnish
rust
patina
oxide
Using what you have learned by taking notes, determine if the change shown in the first image (ice melting) is a chemical or physical change.
Chemical change
Physical change
Using what you have learned by taking notes, determine if the change shown in the second image (cookie dough baking) is a chemical or physical change.
Chemical change
Physical change
Charcoal in a fire turns to ash after several hours. Is this a physical or chemical change?
Physical Change
Chemical Change
Which process describes only a physical change?
Fungus decomposing organic matter
Leaves using carbon dioxide to make surgar
Plants using nitrogen to make protein
Water evaporating from salt water
Researchers are investigating processes that happen during digestion.
Which answer choice describes only a physical change during digestion?
Hydrochloric acid in the stomach breaks down proteins
Chewing in the mouth breaks food into small pieces
Enzymes in saliva start the digestion of starches before food is swallowed
Bacteria in the intestines convert dietary fiber into fats
Both the esophagus and the small intestine are involved in the digestion of food. The esophagus squeezes food into the stomach by wave-like muscle contractions. Peptidase enzymes in the small intestine break food molecules into smaller molecules.
Which statement best describes changes to food during digestion?
The muscle contractions result in physical changes, while the action of the peptidase results in chemical changes
The muscle contractions and the action of the peptidase both result only in physical changes
The muscle contraction result in chemical changes, while the action of the peptidase results in physical changes
The muscle contractions and the action of the peptidase both result only in chemical changes
A student listed how different parts of the body work to aid in the digestion of food.
Which of the following is a chemical change that occurs to the food?
The reduction in size of food particles as food is chewed
The movement of food to the stomach after food is swallowed
The breakdown of molecules of food by enzymes and acid in the stomach
Many processes occur in the digestive system.
Which process is best classified as a physical change?
Saliva converting the starch molecules in crackers into simple sugars
Digestive enzymes breaking down proteins into smaller fragments
Bacteria converting lactose into simple sugars in the intestines
Teeth grinding an almond into smaller pieces in the mouth
Which of the following does NOT indicate a chemical reaction is occurring? Check all that apply.
Unknown A dissolves into Unknown B
Unknown A creates fizzing and bubbles when combined with Unknown B
Unknown A sinks to the bottom when added to Unknown B
Unknown A floats to the top when added to Unknown B
What evidence can you use to infer that a chemical reaction has occurred here?
A dark solid formed on the zinc metal
The zinc metal remained silver-colored and shiny
The CuSO4 solution turned blue when the zinc metal was added
None of these
Which scientific observation, shown in the chart, indicates that a chemical reaction has NOT occurred?
Number 1
Number 2
Number 3
Number 4
Zinc is an element that can chemically react with other substances. When zinc reacts with hydrochloric acid, zinc chloride is produced. Which observation best supports the conclusion that a chemical reaction has occurred between zinc and the acid?
Zinc is an element
Acids are a safety hazard
A new substance is formed
A group of students make observations about the changes that occur to a candle as it burns. A table of their observations is shown below. Based on these observations, the students decide that a chemical change is occurring.
Which observation provides the least evidence that the burning candle is undergoing a chemical change?
Light is being given off by the flame
Heat is being released from the candle
The wax around the wick is melting
Gases are being produced by the fire
Students in a science classroom perform investigations using different solutions. During each investigation two solutions are mixed and the students make observations. Which of the following observations would provide the LEAST evidence that a chemical reaction had occurred after the solutions were mixed?
Bubbles began to form after the solutions were mixed
The solutions were slow to mix because they had different densities
After the solutions mixed, a change in color was observed
An increase in temperature was recorded after the solutions were mixed
A student mixed two clear solutions together, but she did not notice any obvious changes in the solutions. Both solutions remained clear, and no new gaseous or solid substances were observed. The student is still not sure if a chemical change occurred when the solutions were mixed. Which of the following procedures would provide the BEST evidence to determine if a chemical change occurred?
Measure the mass before and after the solutions mixed
Measure the total volume of solutions before and after they are mixed
Measure the temperature of the solutions before and after they are mixed
Measure the conductivity of these solutions before and after they are mixed
Students in a science class performed the four investigations shown above. During which investigations did a chemical change most likely occur? (Select TWO)
A container of water is placed on a hot plate and the water begins to evaporate
Two liquids are placed together and instead of mixing they form two layers in the container
A piece of metal is placed into a solution and bubbles form and the temperature increases
Two clear solutions are mixed together and a white solid forms and sinks to the bottom of the container
A teacher placed some vinegar (acetic acid) into a beaker. She then placed a scoop of baking soda (sodium bicarbonate) into the same beaker. Which of these observations gives the best evidence that a chemical change occurred?
Some baking soda dissolved in the vinegar
Vinegar evaporated and could be smelled in the room
The baking soda and vinegar mixed and produced bubbles
A portion of the baking soda sank to the bottom of the beaker
During an investigation, students mixed together two clear solutions in a test tube. The students then observed the changes that occurred.
A student concluded that a chemical change occurred.
Which observation best supports this conclusion?
The color of the solid substance is yellow
A precipitate was produced from the solutions
The solutions became clear after they were mixed
Name 3 events that would provide evidence of a chemical change.
the substance catches fire and flames are visible
smoke is produced
heat is added to the substance
the substance changes from a solid to a liquid
The substance changes from clear to black
The sugar in my lemonade seems to disappear when I stir it. This is called __.
solubility
solid
mixture
Reactivity of a subject is a _____ change.
chemical
physical
Using a hot plate to heat a solid until it changes color and releases an odor would provide evidence of a chemical change because the particles cannot be changed back. This is what type of change?
chemical
physical
Which of the following options provides evidence of a CHEMICAL change?
Wood is burned releasing ash and smoke
Rocks separate when soil is sifted
Boiling water bubbles when heated
Salt dissolves in water
Which of the following is an example of both a physical and a chemical change?
chopping vegetables with a knife
burning a candle
dissolving hot cocoa mix in water
pouring cold water on a hot object
When two liquids are mixed, the container feels cold to the touch. This is evidence of what?
physical change
chemical change
state of matter change
no change
Which of the following would indicate the formation of a new substance?
A liquid turns to a solid.
A sample of metal melts.
Bubbles and fizzing occur.
A solid dissolves in a liquid.
Which of the following is an example of a physical change in your home?
frying an egg
lighting a birthday candle
cooking a pizza in the oven
a light bulb is hot after being on for a while
Which of the following is an example of a physical change?
an explosion
a solid stays a solid
a piece of paper is crumpled
two liquids are mixed and it warms up
Metals are useful materials in that they are good conductors of heat and electricity. Metals that can be changed to meet specific needs. All of the following changes to a metal are physical changes except -
bending
melting
rusting
polishing
An older bicycle shows wear and tear. Which of the following signs show that a chemical change has occurred to the bicycle?
rust on the wheel
broken light
torn seat cover
bent handle bar
In the laboratory, a blue liquid is mixed with a yellow liquid. What would be the best evidence that a chemical change took place as the liquids were mixed?
The new liquid is green.
The yellow liquid floats on top of the blue.
The formation of a gas.
No change in the temperature of the new solution.
Jack leaves solid butter near a warm surface. When Jack returns, the butter has turned into a liquid. Jack's friend Elijah insists this is a chemical change. Is Elijah right?
no, because no new matter was formed
yes, because the matter changed states
no, because the butter didn’t have enough time to go through a chemical change
yes, because melted butter is a new type of matter
When combined, the powder and water create a solution because the powder dissolves evenly into the water. This is an example of a __________. If the water were evaporated from the solution, the powder would __________.
physical change ; have disappeared
physical change ; remain
chemical change ; be a new matter
chemical change ; remain
1. The Best Friend's Club uses "invisible ink" to write notes to each other. The invisible ink is actually lemon juice that is clear when it dries on paper, but turns brown when a club member holds a burning candle under the paper. Once it is heated, it is never invisible again.
What type of change is occurring when the paper is heated?
Chemical Change
Physical Change
Elemental Change
Temperature Change
A student mixes two clear liquids together. After a few minutes, a white powdery solid can be seen settling on the bottom of the test tube. Which of the following is a conclusion that the student can draw based on these observations? The two clear liquids-
were pure substances before they were mixed
are toxic and should be handled with extreme caution
have gone through a chemical change in which a new substance called a precipitate was produced
have been stored too long and are no longer good
Shredding paper is an example of a
chemical change
physical change
physical property
chemical property
A student added white crystals to a clear liquid. The crystals dissolved in the liquid. After a few seconds, the liquid became quite warm and then turned bright red in color. Indications that a chemical change was taking place could be observed when –
the white crystals were added to the clear liquid.
the crystals dissolved in the liquid leaving only the liquid visible
There are no indications of chemical change
the temperature of the liquid increased and an unexpected color change occurred.
A student observes some sugar as it is heated and burns. The student concludes that a chemical reaction has occurred. Which of the following observations about the burning sugar provides evidence of a chemical reaction?
Heat is added to the sugar crystals.
The sugar melts and becomes a liquid.
Gas is produced as the sugar turns black.
No evidence of chemical reaction is present.
Bethany had a beaker with a small amount of baking soda. She added a few drops of pickle juice to the baking soda and observed fizzing and bubbling. Based on her observation, which of these can Bethany determine about the new substance formed by mixing the baking soda and pickle juice?
A chemical reaction produced a solid.
A chemical reaction produced a gas.
No chemical reaction took place.
Only a physical change happened.
A granular substance is added to a liquid. Which of the following would provide evidence to suggest a chemical change has taken place?
The liquid gives off heat.
The granules dissolve completely.
The volume of the liquid increases.
The granules seem to get smaller.
Olivia had a beaker with a small amount of baking soda. She added a few drops of vinegar to the baking soda and observed fizzing and bubbling. Based on her observation, which of these can Vanessa determine about the new substance formed by mixing the baking soda and vinegar?
It was hot.
It was a gas.
It was magnetic.
It was a conductor
When two liquids are mixed and a solid forms as a result of a reaction, the solid is called a
participant
percipitate
polypeptide
precipitate
The brown color of a cut apple can be called
physical change
chemical change
evidence of chemical reaction
all of the above
How many of the listed observations indicate a new substance was formed?
The student observed that the temperature changed from 25 •C to 23 •C when the solutions were combined and that a white substance rapidly formed and settled to the bottom of the container. What most likely happened to produce these results?
