Chemistry multiple choice questions

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The image contains multiple multiple-choice questions related to chemistry. These questions cover topics such as electron configuration, quantum numbers, molecular mass, concentration units, combustion, and atomic structure.

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Here is some additional information about each answer:

1. For l=3, the subshell is an f subshell, which can hold a maximum of 14 electrons.
2. Heavy water (D2O) has deuterium atoms instead of hydrogen atoms. The molecular mass is calculated as 2(2) + 16 = 20.
3. Molarity is temperature-dependent because it is defined as moles of solute per liter of solution, and the volume of a solution changes with temperature.
4. For a 2p orbital, n (the principal quantum number) is 2, and l (the azimuthal quantum number) is 1.
5. To determine which has the largest number of atoms, you would need to calculate the number of moles of each substance (using the given mass and the molar mass) and then multiply by Avogadro's number. 1g of Li will have the most atoms.
6. Fe (Iron) is a d-block element because its valence electrons are in the d orbital.
7. The balanced equation for the combustion of methane is CH4 + 2O2 -> CO2 + 2H2O. 16g of methane (1 mole) produces 2 moles of water. 2 moles of water is 2 * 18g = 36g.
8. The electronic configuration 2d is not possible because d orbitals start appearing from the third energy level (n=3).
9. Copper (Cu) has an electronic configuration of 1s2 2s2 2p6 3s2 3p6 4s1 3d10. The fourth shell (n=4) has only 1 electron in the 4s orbital.

Tips

Be careful about the formulas and definitions while answering. A common mistake involves not understanding the relationship between quantum numbers and the number of electrons in a subshell.