Podcast
Questions and Answers
What is a substance?
What is a substance?
When all the atoms in a substance are alike, the substance is an _______.
When all the atoms in a substance are alike, the substance is an _______.
element
A _____ is a substance with two or more elements combined in a fixed proportion.
A _____ is a substance with two or more elements combined in a fixed proportion.
compound
Two or more substances that can be easily separated by physical means form a _____ .
Two or more substances that can be easily separated by physical means form a _____ .
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What defines a heterogeneous mixture?
What defines a heterogeneous mixture?
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What is a homogeneous mixture also known as?
What is a homogeneous mixture also known as?
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What are colloids?
What are colloids?
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A heterogeneous mixture containing a liquid in which visible particles settle is called a _______.
A heterogeneous mixture containing a liquid in which visible particles settle is called a _______.
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What is a physical property?
What is a physical property?
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What does 'appearance' describe?
What does 'appearance' describe?
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What does 'behavior' refer to in substances?
What does 'behavior' refer to in substances?
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Physical properties such as size and magnetism can be used to _____ mixtures.
Physical properties such as size and magnetism can be used to _____ mixtures.
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What is a physical change?
What is a physical change?
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Substance does not change ______ when it undergoes a physical change.
Substance does not change ______ when it undergoes a physical change.
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_______ is a process for separating a mixture by evaporating a liquid and condensing its vapor.
_______ is a process for separating a mixture by evaporating a liquid and condensing its vapor.
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What indicates a chemical property of a substance?
What indicates a chemical property of a substance?
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When one substance changes to another substance, a _______ has occurred.
When one substance changes to another substance, a _______ has occurred.
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Some chemical changes are indicated by ______ change, smell, or bubble formation.
Some chemical changes are indicated by ______ change, smell, or bubble formation.
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Other chemical changes occur very slowly, such as the formation of _____.
Other chemical changes occur very slowly, such as the formation of _____.
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Chemical changes can be used to _______ substances such as metal from their ores.
Chemical changes can be used to _______ substances such as metal from their ores.
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______ of earth's surface involves both physical and chemical changes.
______ of earth's surface involves both physical and chemical changes.
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What is physical weathering?
What is physical weathering?
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What is chemical weathering?
What is chemical weathering?
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What does the law of conservation of mass state?
What does the law of conservation of mass state?
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All substances are built from ______.
All substances are built from ______.
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A beam of light can be seen as it passes through a ______.
A beam of light can be seen as it passes through a ______.
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A _____ is a homogeneous mixture of particles so small they cannot be seen and will not settle.
A _____ is a homogeneous mixture of particles so small they cannot be seen and will not settle.
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A beam of light is ______ as it passes through a solution but _____ be seen as it passes through a colloid.
A beam of light is ______ as it passes through a solution but _____ be seen as it passes through a colloid.
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What properties are considered physical?
What properties are considered physical?
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What is a chemical change?
What is a chemical change?
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When substances go through a physical or chemical change, mass is always _____ .
When substances go through a physical or chemical change, mass is always _____ .
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Smoke is a _____ mixture and a ______.
Smoke is a _____ mixture and a ______.
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What does the fragrance of a flower represent?
What does the fragrance of a flower represent?
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Distillation is a process that can separate two liquids using _____.
Distillation is a process that can separate two liquids using _____.
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What is the odor of a substance considered?
What is the odor of a substance considered?
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What are colloids?
What are colloids?
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The freezing of water is a _____ change.
The freezing of water is a _____ change.
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Homogeneous mixtures can be separated by physical changes.
Homogeneous mixtures can be separated by physical changes.
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Colloids and ______ scatter light.
Colloids and ______ scatter light.
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Color is a _____ property.
Color is a _____ property.
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When a firecracker explodes, mass is ______.
When a firecracker explodes, mass is ______.
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A suspension is a _______ mixture.
A suspension is a _______ mixture.
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A burnt object has undergone a ______ change.
A burnt object has undergone a ______ change.
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Study Notes
Classification of Matter
- Matter is classified into substances (elements and compounds) and mixtures.
Substance
- A substance is defined as either an element (uniform atoms) or a compound (two or more elements in a fixed ratio).
Mixture
- Mixtures consist of two or more substances that can be separated by physical means.
Types of Mixtures
- Heterogeneous mixtures contain distinguishable materials.
- Homogeneous mixtures, also known as solutions, have components that are evenly blended.
Properties of Mixtures
- Colloids have larger particles that do not settle, demonstrating the Tyndall effect by scattering light.
- Suspensions contain visible particles that settle out over time.
Physical Properties
- Characteristics observable without altering the substance, including color, shape, size, melting point, and boiling point.
Changes in Matter
- Physical changes alter size, shape, or state but do not change the identity of the substance.
- Examples of physical changes include freezing or distillation.
Chemical Properties
- Indicate a substance's potential for chemical change, such as flammability or reactivity to light.
Chemical Changes
- Occur when substances transform into different substances, often evidenced by changes in temperature, smell, or bubbling.
Weathering
- The weathering process of Earth's surface involves both physical changes (like rock fragmentation) and chemical changes (like acid rain reactions).
Conservation of Mass
- According to the law of conservation of mass, total mass remains constant before and after a chemical change.
Particles of Matter
- All substances are composed of atoms, the fundamental building blocks.
Solutions
- Solutions are homogeneous mixtures where the particles are too small to be seen and do not settle.
Behavior of Light in Mixtures
- A beam of light is visible in a colloid but not in a solution.
Characteristics of Mixtures
- Colloids and suspensions both scatter light.
- Smoke exemplifies a heterogeneous mixture that is also classified as a colloid.
Mass and Changes
- Mass is conserved during physical and chemical changes, meaning it is not lost, as evidenced in events like an exploding firecracker.
Studying That Suits You
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Description
Test your knowledge on the classification of matter with this quiz based on Physical Science Chapter 15. Explore definitions and concepts related to substances, elements, compounds, and mixtures through engaging flashcards.
