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Quizzes > Science

Physical Chemical Changes Answer Key (Color by Number)

Quick science quiz with a color by number answer key. Instant feedback.

Editorial: Review CompletedCreated By: Sadasd AsdsadUpdated Aug 28, 2025
Difficulty: Moderate
Grade: Grade 5
Study OutcomesCheat Sheet
Vibrant paper art promoting the Colorful Change Challenge, a high school science quiz.

Use this color-by-number quiz to practice telling physical and chemical changes apart, with an answer key for instant feedback. For extra review, try classifying physical and chemical changes, take a physical vs chemical change quiz, or do a chemical change quick check.

What is a physical change?
A process that creates a new substance by altering its chemical composition.
A permanent change that cannot be undone.
A change in form or appearance without altering the substance's identity.
A change involving the release of energy through chemical reactions.
A physical change involves modifications in form or appearance while the underlying chemical composition remains unchanged. The process is usually reversible, as no new substances are created.
What is a chemical change?
A reversible process that does not alter the chemical composition.
A change in physical state only.
A process that results in the formation of one or more new substances with different properties.
A change that only affects the appearance of a substance.
Chemical changes involve a rearrangement of atoms to form new substances with distinct properties. Such processes are often accompanied by energy changes, making them fundamentally different from physical changes.
Which of the following is an example of a physical change?
Burning wood.
Baking a cake.
Melting ice.
Rusting of iron.
Melting ice is a physical change because it involves a change of state from solid to liquid without any alteration in chemical composition. The molecular structure of water remains H2O throughout the process.
Which property remains unchanged during a physical change?
Temperature.
State of matter.
Physical shape.
Chemical composition.
During a physical change, although the appearance or state of a material may change, its chemical composition remains constant. This means the substance's fundamental identity is preserved.
Which process is an example of a chemical change?
Rusting of iron.
Stretching a rubber band.
Freezing water.
Dissolving sugar in water.
Rusting of iron is a chemical change because it involves the oxidation of iron to form iron oxide, a new compound with distinct properties. Such a transformation alters its chemical composition permanently.
How can you identify a chemical change?
By the change in state only.
By simply measuring temperature differences.
If the substance returns to its original form immediately.
By the formation of new substances indicated by color change, gas evolution, or precipitate formation.
Chemical changes are often identified by observable signs like color changes, gas evolution, or precipitation. These indicators suggest that new substances have been formed through chemical reactions.
Which process best represents a physical change?
Cooking an egg.
Souring milk.
Burning paper.
Boiling water.
Boiling water is a physical change because it involves a state change from liquid to vapor without altering the molecular structure of water. No new chemical substances are formed during boiling.
Which factor is crucial when distinguishing between physical and chemical changes?
The speed with which the change occurs.
Whether the substance is moving.
Whether the molecular structure or chemical composition changes.
The amount of energy used in the process.
A key indicator of a chemical change is a change in the molecular structure or chemical composition of a substance. Physical changes, by contrast, alter only the form or state while keeping the underlying chemistry the same.
What common observation suggests that a chemical change has occurred?
The release of gas or formation of bubbles.
A simple change in shape.
A change in temperature without any visible change.
A transition from one state of matter to another.
The release of gas or the formation of bubbles is a hallmark of a chemical change because it indicates that new substances are forming. This is distinct from physical changes, where no new substances are produced.
Which property is typically observed during a chemical reaction?
The release or absorption of energy in the form of heat or light.
Only a change in physical shape.
A subtle change in clarity.
A minor change in boiling point.
Chemical reactions often involve significant energy changes, such as the release or absorption of heat or light. These energy shifts occur because the bonds between atoms are being broken and reformed during the reaction.
Which of these processes is reversible?
Cooking food.
Melting and refreezing water.
Burning a log.
Rust formation on iron.
Melting and refreezing water is an example of a reversible physical change because the substance remains chemically unchanged throughout the process. In contrast, chemical changes like rusting are generally irreversible.
How does the law of conservation of mass apply to physical changes?
Mass is unpredictable during these changes.
Mass remains constant before and after the change.
Mass is converted completely into energy.
Mass increases during physical changes.
The law of conservation of mass states that mass cannot be created or destroyed during a physical change. Even though the matter may change its form or state, the total mass remains the same.
When water evaporates, what type of change occurs?
A physical change.
A chemical change.
A nuclear change.
An irreversible chemical change.
Evaporation involves the change of state from liquid to gas without altering the chemical composition of the water. As no new substances are formed, this process is classified as a physical change.
Why is the melting of ice considered a physical change?
Because it produces new molecules.
Because it only involves a change in state from solid to liquid.
Because it releases heat energy.
Because it is an irreversible process.
The melting of ice is a physical change because it only causes a transition from a solid state to a liquid state. The water molecules remain the same throughout the process, indicating no chemical transformation occurred.
During a chemical change, what happens to the bonds between atoms?
New bonds form without breaking the old ones.
They are broken and new bonds are formed to create different substances.
They remain completely unchanged.
They only stretch and then return to their original state.
In a chemical change, the bonds between atoms are broken and reformed, leading to the creation of new substances with different properties. This rearrangement of bonds is a defining characteristic of chemical reactions.
A reaction exhibits a color change and produces heat. Which of the following best explains why this is considered a chemical change?
Because heat is a definitive sign of a physical change.
Because the color change and heat release indicate bond rearrangement and formation of new substances.
Because only chemical reactions can produce a color change.
Because physical changes never involve heat.
The appearance of a color change along with heat release suggests that chemical bonds are breaking and forming, resulting in new substances. These observable signs are strong indicators of a chemical reaction rather than a physical change.
In an experiment where a metal reacts with an acid producing bubbles, a temperature increase, and a color change, what indicates that a chemical change has taken place?
Only the bubbling indicates a physical transformation.
The temperature increase is unrelated to chemical changes.
The production of gas alone confirms a purely physical process.
The combination of bubbles, heat, and color change indicates bond rearrangement and the formation of new substances.
Multiple signs such as bubbling, an increase in temperature, and a color shift together illustrate that a chemical reaction is occurring. These observations collectively indicate that the original substances are transforming into new compounds with different properties.
How can a process involve both physical and chemical changes concurrently, and what cues help differentiate the two?
Only physical changes produce observable cues.
A process may include a reversible state change alongside a chemical reaction indicated by cues such as gas evolution or color change.
Both changes happen simultaneously without any observable differences.
Physical changes always mask any underlying chemical reactions.
Some processes can exhibit a physical change, such as a state transition, at the same time as a chemical change, like oxidation. Observable cues such as gas bubbles or color shifts help differentiate the chemical transformation from the physical change.
What is the main difference between energy transformations in physical changes versus chemical changes?
Energy is not transformed in any significant way during physical changes.
Both types involve identical energy transformations.
Chemical changes involve significant energy changes from bond breaking and formation, while physical changes involve smaller energy exchanges related to state changes.
Physical changes involve large energy releases while chemical changes do not.
Chemical changes involve breaking old bonds and creating new ones, which typically requires or releases a significant amount of energy. Physical changes generally involve smaller energy shifts associated with changes in state, making the difference in energy transformation a key distinguishing factor.
When comparing a separation process and a reaction-based purification, what indicates that a chemical change has occurred in the latter?
Temperature changes are irrelevant in distinguishing chemical changes.
Only a change in texture signals a chemical reaction.
The formation of new compounds with distinct properties, often indicated by precipitate, gas evolution, or color change.
A change in physical appearance alone is sufficient.
In reaction-based purification, the occurrence of a chemical change is marked by the formation of new substances that exhibit different physical properties, such as a precipitate or color change. This contrasts with simple separation techniques, which do not alter the chemical composition of the original substances.
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Study Outcomes

  1. Understand the key differences between physical and chemical changes.
  2. Analyze visual cues to distinguish between types of changes.
  3. Apply scientific concepts to interpret color-coded representations.
  4. Evaluate evidence from interactive practice scenarios.
  5. Synthesize observations to enhance exam readiness.

Color-by-Number Answer Key: Phys/Chem Changes|QuizMaker Cheat Sheet

  1. Difference between physical and chemical changes - Physical changes tweak the appearance or state of a substance without creating something new, while chemical changes break and form bonds to make brand‑new materials. Understanding this distinction will help you predict outcomes when substances interact.
  2. Signs of chemical changes - Keep an eye out for color shifts, bubbling (gas release), precipitate formation, or sudden heat/light - these are classic clues that a chemical reaction is happening. Spotting these tells you when new substances are forming.
  3. Reversible physical changes - Processes like melting, freezing, or cutting typically don't alter the substances themselves and can often be undone. Recognizing these helps you separate simple transformations from true chemical reactions.
  4. Real‑life examples - Think of melting ice, tearing paper, dissolving sugar (physical) versus rusting iron or burning wood (chemical). These everyday scenarios make the concepts stick in your mind.
  5. Chemical bond breaking and forming - Chemical changes rearrange atoms by breaking old bonds and forging new ones, creating substances with fresh properties. Delving into bond dynamics gives you a microscopic lens on reactions.
  6. No new substances in physical changes - When you freeze water into ice or bend a paperclip, the substance itself remains unchanged at the molecular level. This often makes it easy to reverse these changes.
  7. Energy shifts in chemical reactions - Many chemical changes release or absorb heat, light, or sound - think exothermic fireworks or endothermic ice packs. Tracking energy flow helps you classify reactions.
  8. Irreversibility of chemical changes - Because new substances form, reversing a chemical reaction is usually tough without another reaction. Knowing this keeps you from expecting to "unburn" wood or "unrust" metal.
  9. Interactive simulations and experiments - Virtual labs let you mix, heat, cool, and observe without safety worries - and you can replay reactions to catch every detail. Hands‑on practice cements your learning!
  10. Key vocabulary review - Terms like catalyst, oxidizer, precipitate, and states of matter are your new best friends for describing and predicting changes. A strong vocabulary makes complex ideas click faster.
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