4.5.2.2 - Examples of Counting Atoms
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Practice Questions
Test your understanding with targeted questions
How many atoms are in the formula H₂O?
💡 Hint: Count the subscripts.
In the formula CO₂, how many oxygen atoms are there?
💡 Hint: Look at the subscript after the O.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What does a subscript indicate in a chemical formula?
💡 Hint: Think about what each part of the formula represents.
True or False: The absence of a subscript after an element means there is one atom of that element.
💡 Hint: Recall how we interpret chemical formulas.
3 more questions available
Challenge Problems
Push your limits with advanced challenges
Given the formula C₄H₁₀, calculate the total number of atoms and explain your reasoning.
💡 Hint: Break it down by each type of atom.
In the formula Ca(OH)₂, what is the total number of atoms, and how do you arrive at that number?
💡 Hint: Consider both the single elements and the group in parentheses.
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