Questions and Answers
A mixture is a chemical combining of substances.
False
In a compound, the ______ are chemically combined so that the elements that make up the compound ______ their identities and ______ take on a new set of properties.
The smallest identifiable unit of a compound is a(n) _____ which is made up of _____ which are chemically bonded.
molecule, atoms
A mixture is always made up of a combination of elements.
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In a mixture, the substances ______ their identities.
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In a mixture, the substances involved ______ be separated by a simple physical process because the elements are ______.
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An element can be broken down into a simpler substance.
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The smallest identifiable unit of an element is a(n) _____
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From the following list of substances, which ones are elements?: silver, water, oxygen, air, carbon dioxide, hydrogen, gold, sulfur, wood alcohol, carbon, sugar, magnesium, chromium, nitrogen, salt, nickel
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Explain how to separate the sugar and water in a solution of sugar and water.
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How would you separate a mixture of alcohol and water?
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How would you separate sand and water?
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Is air classified as a pure substance or a mixture?
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Is water classified as a pure substance or a mixture?
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Is mercury classified as a pure substance or a mixture?
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Is gasoline classified as a pure substance or a mixture?
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Is sugar classified as a pure substance or a mixture?
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Is oxygen classified as a pure substance or a mixture?
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Is grain alcohol classified as a pure substance or a mixture?
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Is salt water classified as a pure substance or a mixture?
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Is a sand and salt mixture classified as heterogeneous or homogeneous?
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Is salt water classified as a heterogeneous or homogeneous?
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Is pure water classified as a heterogeneous or homogeneous?
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Is tossed salad classified as a heterogeneous or homogeneous?
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Is hydrogen classified as a heterogeneous or homogeneous?
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Is air classified as a heterogeneous or homogeneous?
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Is an apple classified as a heterogeneous or homogeneous?
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Is granite classified as a heterogeneous or homogeneous?
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Is iron classified as a heterogeneous or homogeneous?
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Is iron with rust classified as a heterogeneous or homogeneous?
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Is nitric acid classified as a heterogeneous or homogeneous?
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Is wood classified as a heterogeneous or homogeneous?
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Is freshly-brewed black coffee classified as a heterogeneous or homogeneous?
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Is water classified as a heterogeneous or homogeneous?
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Is Lucky Charms classified as a heterogeneous or homogeneous?
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Is salt classified as a heterogeneous or homogeneous?
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Is dirt classified as a heterogeneous or homogeneous?
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Study Notes
Mixtures and Compounds
- A mixture is not a chemical combining of substances; components retain their individual identities.
- In compounds, atoms are chemically combined, causing them to lose their original identities and acquire new properties.
- The smallest unit of a compound is a molecule, which consists of chemically bonded atoms.
Elements and Mixtures
- A mixture can include substances other than just elements; it is false that a mixture is always made up of elements.
- Elements cannot be broken down into simpler substances.
- The smallest identifiable unit of an element is an atom.
Identification of Elements
- Elements from a specified list include: silver, oxygen, hydrogen, gold, sulfur, carbon, magnesium, chromium, nitrogen, nickel. Other substances on the list are compounds or mixtures.
Separation Techniques
- Sugar can be separated from water by dissolving it, stirring, and then allowing the water to evaporate.
- Alcohol can be separated from water by heating, as it vaporizes before water at 78°C.
- Sand can be separated from water through filtration.
Classification of Substances
- Air is classified as a mixture, while water, mercury, oxygen, sugar, and grain alcohol are considered pure substances.
- Gasoline and salt water are deemed mixtures.
Heterogeneous and Homogeneous Mixtures
- A sand and salt mixture is classified as heterogeneous, while salt water is homogeneous.
- Pure water is homogeneous, as are nitric acid and freshly brewed black coffee.
- Tossed salad, an apple, granite, and dirt are classified as heterogeneous mixtures.
- Iron is homogeneous, but iron with rust is heterogeneous.
General Properties
- Sugar, salt, and pure water are homogeneous substances.
- Heterogeneous mixtures vary in composition and appearance, exemplified by items like Lucky Charms, sausage-and-mushroom pizza, and wood.
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Description
This quiz focuses on the fundamental concepts of matter, including mixtures and compounds. It will test your understanding of how substances combine and the properties of these combinations. Perfect for students studying chemistry at any level.
