Counting Atoms #1
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 the composition of a substance using symbols for its constituent elements and numbers to indicate the quantity of each element.
2.
FLASHCARD QUESTION
Front
How do you determine the number of elements in a chemical formula?
Back
Count the different element symbols present in the formula. For example, in NaHCO3, there are 4 different elements: Na, H, C, and O.
3.
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 2 hydrogen atoms.
4.
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 a substance formed when two or more different types of atoms bond together.
5.
FLASHCARD QUESTION
Front
How many sodium (Na) atoms are in the formula 6NaCl?
Back
There are 6 sodium (Na) atoms in the formula 6NaCl.
6.
FLASHCARD QUESTION
Front
What is the total number of atoms in the compound NaHCO3?
Back
There are 6 total atoms in NaHCO3: 1 Na, 1 H, 1 C, and 3 O.
7.
FLASHCARD QUESTION
Front
How many atoms of iron (Fe) are in the compound Fe2O3?
Back
There are 2 atoms of iron (Fe) in the compound Fe2O3.
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