Podcast
Questions and Answers
What is an example of a physical change that cannot readily be undone by physical means?
What is an example of a physical change that cannot readily be undone by physical means?
How are mixtures of substances that are not soluble usually separated?
How are mixtures of substances that are not soluble usually separated?
What effect do crystals in metals have on the physical properties of the metal?
What effect do crystals in metals have on the physical properties of the metal?
Which process results in substances such as iodine and carbon dioxide going directly from solid to gas?
Which process results in substances such as iodine and carbon dioxide going directly from solid to gas?
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What can be separated by fractional distillation?
What can be separated by fractional distillation?
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Which of the following best describes a physical change?
Which of the following best describes a physical change?
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What is an example of a physical change?
What is an example of a physical change?
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Which property would be considered a physical property?
Which property would be considered a physical property?
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What distinguishes a physical change from a chemical change?
What distinguishes a physical change from a chemical change?
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Which process exemplifies a physical change?
Which process exemplifies a physical change?
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Study Notes
Physical Changes
- An example of a physical change that cannot readily be undone by physical means is melting of glass.
Separating Mixtures
- Mixtures of substances that are not soluble are usually separated by physical methods, such as filtration or centrifugation.
Crystals in Metals
- Crystals in metals have a significant impact on the physical properties of the metal, such as strength and ductility.
Phase Changes
- Sublimation is the process that results in substances such as iodine and carbon dioxide going directly from solid to gas.
- This process occurs when the intermolecular forces between molecules are weak, allowing them to change directly from solid to gas.
Separation Techniques
- Fractional distillation is a method used to separate a mixture of two or more substances with different boiling points.
Defining Physical Changes
- A physical change is best described as a change in which a substance changes its state, but its chemical composition remains the same.
- An example of a physical change is the melting of ice, where the solid (ice) changes to a liquid (water).
- Physical properties, such as color, shape, and state, are characteristics that can be observed or measured without changing the chemical composition of a substance.
Distinguishing Physical and Chemical Changes
- A physical change is distinguished from a chemical change by the fact that the chemical composition of the substance remains the same.
- A process that exemplifies a physical change is the dissolving of sugar in water, where the sugar changes its state from solid to solution, but its chemical composition remains the same.
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Description
Test your knowledge about physical changes, which affect the form of a substance without changing its chemical composition. Explore how physical changes are used to separate mixtures and understand the contrast with chemical changes.
