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Questions and Answers
A mixture is a chemical combining of substances.
A mixture is a chemical combining of substances.
False (B)
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.
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.
- molecules, lose, do not
- molecules, retain, do
- atoms, lose, do not (correct)
- atoms, retain, do (correct)
The smallest identifiable unit of a compound is a(n) _____ which is made up of _____ which are chemically bonded.
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.
A mixture is always made up of a combination of elements.
In a mixture, the substances ______ their identities.
In a mixture, the substances ______ their identities.
In a mixture, the substances involved ______ be separated by a simple physical process because the elements are ______.
In a mixture, the substances involved ______ be separated by a simple physical process because the elements are ______.
An element can be broken down into a simpler substance.
An element can be broken down into a simpler substance.
The smallest identifiable unit of an element is a(n) _____
The smallest identifiable unit of an element is a(n) _____
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
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
Explain how to separate the sugar and water in a solution of sugar and water.
Explain how to separate the sugar and water in a solution of sugar and water.
How would you separate a mixture of alcohol and water?
How would you separate a mixture of alcohol and water?
How would you separate sand and water?
How would you separate sand and water?
Is air classified as a pure substance or a mixture?
Is air classified as a pure substance or a mixture?
Is water classified as a pure substance or a mixture?
Is water classified as a pure substance or a mixture?
Is mercury classified as a pure substance or a mixture?
Is mercury classified as a pure substance or a mixture?
Is gasoline classified as a pure substance or a mixture?
Is gasoline classified as a pure substance or a mixture?
Is sugar classified as a pure substance or a mixture?
Is sugar classified as a pure substance or a mixture?
Is oxygen classified as a pure substance or a mixture?
Is oxygen classified as a pure substance or a mixture?
Is grain alcohol classified as a pure substance or a mixture?
Is grain alcohol classified as a pure substance or a mixture?
Is salt water classified as a pure substance or a mixture?
Is salt water classified as a pure substance or a mixture?
Is a sand and salt mixture classified as heterogeneous or homogeneous?
Is a sand and salt mixture classified as heterogeneous or homogeneous?
Is salt water classified as a heterogeneous or homogeneous?
Is salt water classified as a heterogeneous or homogeneous?
Is pure water classified as a heterogeneous or homogeneous?
Is pure water classified as a heterogeneous or homogeneous?
Is tossed salad classified as a heterogeneous or homogeneous?
Is tossed salad classified as a heterogeneous or homogeneous?
Is hydrogen classified as a heterogeneous or homogeneous?
Is hydrogen classified as a heterogeneous or homogeneous?
Is air classified as a heterogeneous or homogeneous?
Is air classified as a heterogeneous or homogeneous?
Is an apple classified as a heterogeneous or homogeneous?
Is an apple classified as a heterogeneous or homogeneous?
Is granite classified as a heterogeneous or homogeneous?
Is granite classified as a heterogeneous or homogeneous?
Is iron classified as a heterogeneous or homogeneous?
Is iron classified as a heterogeneous or homogeneous?
Is iron with rust classified as a heterogeneous or homogeneous?
Is iron with rust classified as a heterogeneous or homogeneous?
Is nitric acid classified as a heterogeneous or homogeneous?
Is nitric acid classified as a heterogeneous or homogeneous?
Is wood classified as a heterogeneous or homogeneous?
Is wood classified as a heterogeneous or homogeneous?
Is freshly-brewed black coffee classified as a heterogeneous or homogeneous?
Is freshly-brewed black coffee classified as a heterogeneous or homogeneous?
Is water classified as a heterogeneous or homogeneous?
Is water classified as a heterogeneous or homogeneous?
Is Lucky Charms classified as a heterogeneous or homogeneous?
Is Lucky Charms classified as a heterogeneous or homogeneous?
Is salt classified as a heterogeneous or homogeneous?
Is salt classified as a heterogeneous or homogeneous?
Is dirt classified as a heterogeneous or homogeneous?
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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