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Questions and Answers
What does a chemical formula represent?
What does a chemical formula represent?
- The method of synthesis of a chemical
- The chemical composition and ratio of elements in a compound (correct)
- The physical properties of a substance
- The history of discovery of a compound
How many atoms of oxygen are present in one molecule of water (H2O)?
How many atoms of oxygen are present in one molecule of water (H2O)?
- 1 (correct)
- 2
- 4
- 3
What is the systematic name for the common name 'water'?
What is the systematic name for the common name 'water'?
- 2-hydroxypropane
- dihydrogen monoxide
- 2-butanone
- 2-propanone (correct)
In the compound sodium chloride (NaCl), what is the ratio of sodium to chlorine atoms?
In the compound sodium chloride (NaCl), what is the ratio of sodium to chlorine atoms?
What distinguishes a common name from a systematic name in chemistry?
What distinguishes a common name from a systematic name in chemistry?
What does the subscript in a chemical formula represent?
What does the subscript in a chemical formula represent?
Which chemical formula indicates a one-to-one ratio of elements?
Which chemical formula indicates a one-to-one ratio of elements?
What does the subscript in a chemical formula signify?
What does the subscript in a chemical formula signify?
Which of the following compounds is represented by the chemical formula C6H12O6?
Which of the following compounds is represented by the chemical formula C6H12O6?
What distinguishes a systematic name from a common name for a chemical?
What distinguishes a systematic name from a common name for a chemical?
Which element's chemical symbol is represented first in the formula H2O?
Which element's chemical symbol is represented first in the formula H2O?
The systematic name for the compound represented by the formula NaCl is:
The systematic name for the compound represented by the formula NaCl is:
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Study Notes
Chemical Formula Overview
- A chemical formula symbolizes a compound's chemical composition.
- It indicates the elements that make up the molecules and their atomic ratios.
- Example: H2O (water) represents 2 hydrogen atoms and 1 oxygen atom.
- Example: NaCl (table salt) indicates 1 sodium atom and 1 chlorine atom in a one-to-one ratio.
Composition and Notation
- Chemical symbols represent elements, with subscripts indicating the quantity of each atom.
- Example: In H2O, the "2" is a subscript showing two hydrogen atoms.
Naming Conventions
- IUPAC (International Union of Pure and Applied Chemistry) establishes systematic naming rules for chemicals.
- Systematic names are precise and identify a single chemical.
- Common names may not adhere to systematic conventions but still clearly denote substances.
- Example: The common name "water" corresponds to the systematic name "2-propanone."
Chemical Formula Overview
- A chemical formula symbolizes a compound's chemical composition.
- It indicates the elements that make up the molecules and their atomic ratios.
- Example: H2O (water) represents 2 hydrogen atoms and 1 oxygen atom.
- Example: NaCl (table salt) indicates 1 sodium atom and 1 chlorine atom in a one-to-one ratio.
Composition and Notation
- Chemical symbols represent elements, with subscripts indicating the quantity of each atom.
- Example: In H2O, the "2" is a subscript showing two hydrogen atoms.
Naming Conventions
- IUPAC (International Union of Pure and Applied Chemistry) establishes systematic naming rules for chemicals.
- Systematic names are precise and identify a single chemical.
- Common names may not adhere to systematic conventions but still clearly denote substances.
- Example: The common name "water" corresponds to the systematic name "2-propanone."
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