Questions and Answers
What is a binary compound?
What is a compound?
Two or more elements that have chemically combined
What is the law of definite proportions?
The principle that a compound always contains exactly the same elements in exactly the same proportions by mass
What is a molecule?
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What does a subscript in a chemical formula indicate?
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The formula for table salt is NaCl. According to the law of definite proportions, this means that the formula for table salt _____
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Which part of an atom is actively exchanged or shared in a chemical bond?
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Pure gold is a(n) _____.
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Pure water is a(n) _____.
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The smallest unit into which a compound can be divided and still be that same compound is a(n) _____.
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How many atoms are in one molecule of rust (Fe2O3)?
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Which of the following would be the best name for MgCl2?
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Which of the following is the best name for N2O?
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From what class(es) of elements is copper(I) chloride made?
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From what class(es) of elements is nitrogen dioxide made?
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Study Notes
Compounds and Their Definitions
- Binary compounds consist of two elements.
- A compound is formed from two or more elements that chemically combine.
- The law of definite proportions states that a compound always contains the same elements in the same mass proportions.
Molecular Structure and Components
- A molecule is the smallest unit of a compound that retains its chemical properties.
- The subscript in a chemical formula indicates the number of atoms of the preceding element in the compound.
Examples and Applications
- The formula for table salt is NaCl, which exemplifies the law of definite proportions as it is always NaCl.
- Electrons are the subatomic particles involved in chemical bonding, as they are exchanged or shared during interactions.
- Pure gold is categorized as an element, whereas pure water is classified as a compound.
Identifying Atoms and Compounds
- A molecule of rust (Fe2O3) contains five atoms.
- MgCl2 is correctly named magnesium chloride.
- The compound N2O is best referred to as dinitrogen monoxide.
Composition of Specific Compounds
- Copper I chloride is composed of a metal and a nonmetal.
- Nitrogen dioxide consists of two nonmetals.
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