Questions and Answers
What is a chemical symbol?
A chemical symbol is a one or two-letter code, with the first letter being uppercase and the second letter being lowercase, used to represent an element in the periodic table.
What is the difference between an element and a compound?
Elements are the most basic substances and have unique atoms, while compounds are made up of two or more different elements.
How can compounds be described?
Compounds can be described by their chemical formula.
What does the subscript in a chemical formula indicate?
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What does the chemical formula of cellulose tell us?
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Which of the following is NOT true about chemical symbols?
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What does the subscript in a chemical formula indicate?
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Which of the following is true about compounds?
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What is the chemical formula for water?
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What is cellulose made up of?
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Study Notes
Chemical Symbols and Formulas
- A chemical symbol is a one- or two-letter abbreviation that represents an element.
Elements and Compounds
- An element is a substance that consists of only one type of atom, while a compound is a substance formed by the chemical combination of two or more different elements.
- Compounds can be described as substances that contain two or more different elements, chemically bonded together.
Chemical Formulas
- In a chemical formula, the subscript indicates the number of atoms of an element present in a compound or molecule.
- The chemical formula of cellulose (C6H10O5) tells us that one molecule of cellulose is composed of 6 carbon atoms, 10 hydrogen atoms, and 5 oxygen atoms.
Chemical Formula Example: Water
- The chemical formula for water is H2O, indicating that one molecule of water consists of 2 hydrogen atoms and 1 oxygen atom.
Cellulose Composition
- Cellulose is a compound made up of carbon, hydrogen, and oxygen atoms.
Facts about Chemical Symbols
- NOT true about chemical symbols: None of the above questions suggest a false statement about chemical symbols.
Facts about Compounds
- TRUE about compounds: Compounds are substances formed by the chemical combination of two or more different elements.
