Podcast
Questions and Answers
Which property describes a substance's ability to be stretched into a wire?
Which property describes a substance's ability to be stretched into a wire?
- Malleability
- Brittleness
- Viscosity
- Ductility (correct)
What indicates a chemical change has occurred?
What indicates a chemical change has occurred?
- Gas is formed (correct)
- Change in texture
- Dissolving in water
- Change in size and shape
Which of the following is a feature of a physical change?
Which of the following is a feature of a physical change?
- A new substance is made
- Precipitate forms
- The process is usually reversible (correct)
- Heat or light is produced
Which of the following describes a substance that can ignite easily?
Which of the following describes a substance that can ignite easily?
What is the ideal indicator of a physical change when mixing two substances?
What is the ideal indicator of a physical change when mixing two substances?
Which property describes the visibility of objects through a material?
Which property describes the visibility of objects through a material?
Which of the following describes a physical property of a substance?
Which of the following describes a physical property of a substance?
Which of the following options best describes the property 'malleable and ductile'?
Which of the following options best describes the property 'malleable and ductile'?
What type of property is indicated by the description 'the magnesium is smooth'?
What type of property is indicated by the description 'the magnesium is smooth'?
Which of the following is NOT described in identifying properties of substances?
Which of the following is NOT described in identifying properties of substances?
What classification does the process of rusting iron fall under?
What classification does the process of rusting iron fall under?
Which of the following changes is classified as a physical change?
Which of the following changes is classified as a physical change?
Which of the following is a characteristic of baking a cake?
Which of the following is a characteristic of baking a cake?
Which process illustrates a change in state but is still classified as a physical change?
Which process illustrates a change in state but is still classified as a physical change?
What is a reason for classifying the formation of clouds as a physical change?
What is a reason for classifying the formation of clouds as a physical change?
Flashcards
Chemical Change
Chemical Change
A change in a substance that produces a new substance with different chemical properties.
Physical Change
Physical Change
A change in the appearance of a substance, but not its chemical composition.
Malleability
Malleability
Describes how easily a substance can be bent or hammered into shapes.
Ductility
Ductility
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Brittleness
Brittleness
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Physical Property
Physical Property
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Chemical Property
Chemical Property
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Evaporation
Evaporation
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Condensation
Condensation
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Melting
Melting
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Study Notes
Physical Properties
- State: Describes the physical form of a substance (solid, liquid, gas).
- Color: Describes the hue of a substance.
- Odor: Describes the smell of a substance.
- Texture: Describes the feel of a substance.
- Hardness: Measures a substance's resistance to scratching.
- Malleability: The ability of a substance to be hammered or pressed into thin sheets.
- Ductility: The ability of a substance to be drawn into wires.
- Brittleness: The tendency for a substance to break easily.
- Lustre/Shininess: Describes if a substance reflects light.
- Clarity: The transparency or opaqueness of a substance.
- Viscosity: Describes a liquid's resistance to flow.
Chemical Properties
- Corrosive: Capable of damaging other substances through chemical reactions.
- Flammable: Easily ignitable and capable of burning.
- Reactive: Easily undergoing change when in contact with another substance.
Evidence of Physical Changes
- Changes of state: e.g., melting, freezing, boiling.
- Blending and Mixing: Combining substances; no new substance is formed.
- Dissolving: When a substance mixes with a solvent (e.g. sugar dissolving into water).
- Cutting: Changing the shape or size of a substance.
- Crushing: Changing the size or shape of a substance by applying force.
- Change in size and shape (e.g., stretching a wire).
- Change in size or shape (e.g., crushing a piece of paper).
- Change in physical state or form: e.g., evaporation, condensation, deposition.
Evidence of Chemical Changes
- Color Change: Change in hue.
- Odor change: Change in smell.
- Heat or light being produced or absorbed.
- Gas is produced.
- Formation of a precipitate: A solid forming in a solution.
- Formation of a new substance (with different properties).
- Formation of a new substance that's an entirely different element, compound, or mixture.
- Formation of a new substance, often with a change of color, smell, or the production of a gas, and commonly with an indication of energy production or absorption.
Physical Changes
- Usually reversible
- No new substance is formed
- Examples include: Change of state, blending, dissolving, cutting, crushing, stretching, resizing, changing size or shape.
Chemical Changes
- Usually not reversible, but some can be reversed with further chemical reactions.
- A new substance is formed
- Examples include: Burning, Corroding, rusting, exploding, reacting with an acid, mixing some substances to create a gas.
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