What is a chemical formula?
Chemical Formula Review

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Science
•
8th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
A chemical formula is a way of expressing the composition of a substance using symbols for its constituent elements and numbers to indicate the ratio of atoms.
2.
FLASHCARD QUESTION
Front
What does the subscript in a chemical formula indicate?
Back
The subscript indicates the number of atoms of the element in the molecule. For example, in H2O, the '2' indicates there are two hydrogen atoms.
3.
FLASHCARD QUESTION
Front
What is the total atom count in the formula 2H2O?
Back
6 (2 Hydrogen + 1 Oxygen = 3 atoms per molecule, and there are 2 molecules: 3 x 2 = 6).
4.
FLASHCARD QUESTION
Front
True or False: A molecule can consist of two or more different elements.
Back
True.
5.
FLASHCARD QUESTION
Front
What elements are present in the compound C6H12O6?
Back
Carbon, Hydrogen, Oxygen.
6.
FLASHCARD QUESTION
Front
What is the difference between an element and a compound?
Back
An element is a pure substance made of only one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.
7.
FLASHCARD QUESTION
Front
What does the formula NaCl represent?
Back
Sodium Chloride, which is table salt, consisting of sodium and chlorine.
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