Chemical Formulas
Flashcard
•
Science
•
8th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is a chemical formula?
Back
A chemical formula is a way of expressing information about the proportions of atoms that constitute a particular chemical compound or molecule.
2.
FLASHCARD QUESTION
Front
How do you determine the number of atoms of an element in a chemical formula?
Back
The number of atoms of an element in a chemical formula is indicated by the subscript following the element's symbol. If there is no subscript, it is understood to be one.
3.
FLASHCARD QUESTION
Front
What does the subscript '2' next to an element symbol indicate?
Back
The subscript '2' indicates that there are two atoms of that element in the molecule.
4.
FLASHCARD QUESTION
Front
What is the significance of the coefficients in a chemical equation?
Back
Coefficients indicate the number of molecules or moles of a substance involved in a chemical reaction.
5.
FLASHCARD QUESTION
Front
What is the difference between an element and a compound?
Back
An element is a pure substance that cannot be broken down into simpler substances, while a compound is a substance formed when two or more elements are chemically bonded together.
6.
FLASHCARD QUESTION
Front
How many different kinds of elements are present in the formula C2H5NO?
Back
There are four different kinds of elements: carbon (C), hydrogen (H), nitrogen (N), and oxygen (O).
7.
FLASHCARD QUESTION
Front
What is the role of nitrogen in biological systems?
Back
Nitrogen is essential for the formation of amino acids, which are the building blocks of proteins, and nucleic acids, which are vital for genetic information.
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