Chemical Formulas and Counting Atoms

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•
Chemistry, Science
•
8th Grade
•
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 elements in a compound and the number of atoms of each element. For example, H2O represents water, which has 2 hydrogen atoms and 1 oxygen atom.
2.
FLASHCARD QUESTION
Front
How do you count atoms in a chemical formula?
Back
To count atoms in a chemical formula, look at the subscripts. The subscript indicates the number of atoms of that element. If there is no subscript, it means there is one atom of that element.
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 CO2, the subscript '2' means there are 2 oxygen atoms.
4.
FLASHCARD QUESTION
Front
What is the significance of protons in determining the identity of an atom?
Back
The number of protons in an atom's nucleus determines its atomic number, which defines the element. For example, an atom with 6 protons is carbon.
5.
FLASHCARD QUESTION
Front
What is the overall charge of a nucleus?
Back
The overall charge of a nucleus is positive due to the presence of protons, which have a positive charge.
6.
FLASHCARD QUESTION
Front
Which group on the periodic table contains oxygen?
Back
Oxygen is found in Group 16 of the periodic table, also known as the chalcogens.
7.
FLASHCARD QUESTION
Front
What is the difference between protons and neutrons?
Back
Protons are positively charged particles found in the nucleus, while neutrons are neutral particles that also reside in the nucleus.
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