Counting Atoms

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•
Chemistry
•
8th Grade
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is the formula for calculating the number of atoms in a compound?
Back
To find the total number of atoms in a compound, sum the products of the coefficients and the subscripts for each element in the formula.
2.
FLASHCARD QUESTION
Front
In the compound Al₂(SO₄)₃, how many oxygen atoms are present?
Back
There are 12 oxygen atoms in Al₂(SO₄)₃.
3.
FLASHCARD QUESTION
Front
What is the product of the reaction 2H₂ + O₂?
Back
The product is 2H₂O.
4.
FLASHCARD QUESTION
Front
How many different elements are in the molecular formula C₆H₁₂O₆?
Back
There are 3 different elements: Carbon (C), Hydrogen (H), and Oxygen (O).
5.
FLASHCARD QUESTION
Front
In the compound 3(NH₄)₂CrO₄, how many hydrogen atoms are there?
Back
There are 24 hydrogen atoms.
6.
FLASHCARD QUESTION
Front
How many magnesium atoms are in the formula 10MgCl₂?
Back
There are 10 magnesium atoms.
7.
FLASHCARD QUESTION
Front
What does a subscript in a chemical formula indicate?
Back
A subscript indicates the number of atoms of the element in the molecule.
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