Multiple Choice
Which observation provides evidence that mercury has a partially molten (liquid) state at room temperature?
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2. Atoms & Elements
The Atom
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
What is the total number of individual atoms present in a single molecule of water (H_2O)?
A
2
B
1
C
3
D
4
Verified step by step guidance1
Identify the chemical formula of the molecule given, which is water (H_2O).
Recognize that the subscript number after each element symbol indicates the number of atoms of that element in one molecule. For H_2O, the subscript '2' after H means there are 2 hydrogen atoms.
Note that the oxygen atom (O) has no subscript, which means there is 1 oxygen atom in the molecule.
Add the number of hydrogen atoms and oxygen atoms together to find the total number of atoms in one molecule: total atoms = number of H atoms + number of O atoms.
Express this as an equation: total atoms = 2 (from H) + 1 (from O).
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