Questions and Answers
An example of a heterogeneous mixture is:
Which of the following is an intensive property?
Which is NOT a pure substance?
Which of the following is classified as a mixture?
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Which is NOT a mixture?
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A sugar cube dissolved in water is an example of a ______ change.
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Substances produced when atoms chemically combine with each other are called _____
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Water is an example of a _____
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Which of the following properties of a substance does not change when the amount of the substance changes? What type of property is it?
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All changes in phase (or state of matter) are:
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You can easily compress a gas because:
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Solids have a ______ shape, a ______ volume, and ______ be compressed.
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Liquids have a ______ shape, a ______ volume, and ______ be compressed.
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Gases have a ______ shape, a ______ volume, and ______ be compressed.
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How is a mixture different from a compound?
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Compounds are:
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Which of the following is an extensive physical property?
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One way of telling whether a mixture is a solution or a suspension is by:
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An example of a homogeneous mixture is:
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The Tyndall effect is a method used to tell apart _____ and ______.
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Colloids _____ a Tyndall effect.
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Solutions _______ a Tyndall effect.
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Describe the Tyndall effect.
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List the 6 ways to separate matter physically:
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Study Notes
Mixtures and Pure Substances
- Heterogeneous mixtures contain visibly different substances, e.g., concrete.
- Intensive properties, such as density, remain unchanged regardless of the amount of substance.
- Brass is not a pure substance; it is a mixture of metals.
- Tap water is classified as a mixture, while distilled water is a pure substance.
- Sodium chloride (table salt) is a pure substance and not a mixture.
Properties of Matter
- A sugar cube dissolving in water is an example of a physical change, not a chemical one.
- Compounds are substances formed when atoms chemically combine and consist of more than one element.
- Water is a classic example of a compound, specifically distilled water.
- Temperature is an intensive property that does not change with the quantity of substance, unlike mass which is extensive.
Changes in State
- Changes in phase or state of matter, such as melting or boiling, are considered physical changes.
- Gases can be compressed due to the significant empty space between particles.
- Solids have a definite shape and volume and cannot be compressed, while liquids have a definite volume but an indefinite shape and can be slightly compressed. Gases have neither a definite shape nor volume and can be compressed easily.
Characteristics of Mixtures vs. Compounds
- Mixtures can be separated by physical means; compounds cannot.
- Compounds are pure substances made up of more than one element and cannot be physically separated.
Physical Properties
- Extensive properties, like mass, depend on the amount of substance present.
- The Tyndall effect distinguishes between colloids and solutions by observing light scattering: colloids show this effect, while solutions do not.
- The Tyndall effect occurs when light is reflected by particles too small to be seen, helping to identify the nature of the mixture.
Methods of Separating Matter
- Matter can be separated physically through various methods:
- Density difference (e.g., separating water and oil).
- Filtration to remove insoluble solids from liquids.
- Chromatography, as demonstrated in ink experiments.
- Distillation, based on varying boiling points.
- Evaporation to leave solids behind.
- Magnetism to attract certain materials from a mixture.
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Description
Test your knowledge on mixtures, pure substances, and the properties of matter. This quiz covers key concepts such as homogeneous and heterogeneous mixtures, intensive and extensive properties, and physical changes. Challenge yourself with questions about compounds and changes in state.
