Chem A Final Study Guide

Identify the number of significant figures in the number: 0.0054

• 2
• 4
• 3
• 1

What is the correct answer with the correct number of significant figures: 2.56 x 0.32

• 0.82
• 0.819

• 0.8192

• 0.8

What is the mass of an atom of Magnesium with 13 neutrons?

(a)  

An isotope is defined as...

• A variant of an element with the same number of protons but a different number of neutrons.
• A variant of an element with the same number of protons but a different number of electrons.
• A variant of an element with the same number of neutrons but a different number of protons.
• A variant of an element with the same number of electrons but a different number of protons.

Which of the following is the compound that is created from combining the ions of Sodium (Na) and Oxygen (O)?

• Sodium Oxide (NaO)
• Sodium Peroxide (Na₂O₂)

• Sodium Hydroxide (NaOH)
• Sodium Oxide (Na₂O)

Tags

NGSS.MS-PS1-1

What is the charge of a proton?

• +2
• -1
• 0
• +1

Which of the following is the definition for Hund's Rule regarding electron configuration?

• Electrons will fill orbitals in pairs with opposite spins before filling them singly.
• Hund's Rule is not related to electron configuration.
• Electrons will fill orbitals in any order without regard to spin.
• Electrons will fill orbitals singly with parallel spins before filling them in pairs.

Which of the following is the definition of the Aufbau principle regarding electron configuration?

• Electrons fill atomic orbitals based on their spin orientation
• Electrons fill atomic orbitals in order of decreasing energy level
• Electrons fill atomic orbitals in order of increasing energy level, starting from the lowest energy level and moving to higher levels as each lower level fills up.
• Electrons fill atomic orbitals in a random order

What is the expanded electron configuration for a neutrally charged atom of Nitrogen (N)?

• 1s² 2s² 2p²
• 1s² 2s² 2p⁴
• 1s² 2s² 2p⁵
• 1s² 2s² 2p³

Which neutrally charged atom is represented by the electron configuration 1s²2s²2p⁶3s¹?

• Sodium
• Magnesium
• Chlorine
• Potassium

Tags

NGSS.HS-PS1-1