Multiple Choice
Which of the following processes can transfer carbon from seashells (composed mainly of calcium carbonate, CaCO$_3$) to the atmosphere?
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4. Biomolecules
Carbon
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Which molecule has the shape of a completed tetrahedron?
A
Water (H2O)
B
Hydrogen gas (H2)
C
Oxygen gas (O2)
D
Methane (CH4)
Verified step by step guidance1
Understand the concept of molecular geometry: A tetrahedral shape in chemistry refers to a central atom bonded to four other atoms, with bond angles of approximately 109.5 degrees.
Identify the central atom in methane (CH4): In methane, carbon (C) is the central atom bonded to four hydrogen (H) atoms.
Visualize the 3D arrangement: The four hydrogen atoms are positioned at the corners of a tetrahedron, with the carbon atom at the center, creating a symmetrical shape.
Compare with other molecules: Water (H2O) has a bent shape due to two hydrogen atoms bonded to oxygen, and hydrogen gas (H2) and oxygen gas (O2) are diatomic molecules with linear shapes.
Conclude that methane (CH4) is the molecule with a completed tetrahedral shape, as it fits the criteria of having a central atom bonded to four other atoms in a symmetrical 3D arrangement.
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