Chemistry HESI A2 Quizlet

Correct Answer: C

Rationale: The correct answer is C: Gamma. Gamma radiation is high-energy electromagnetic radiation with no charge or mass, making it able to penetrate matter easily. Beta (A) and Alpha (B) radiation are particles with charge and mass, and Delta (D) is not a type of radiation. Therefore, Gamma is the only option that fits the given characteristics.

Correct Answer: C

Rationale: The correct answer is C: 3. In a triple covalent bond, 3 electron pairs are shared between two atoms. This results in the sharing of a total of 6 electrons, forming a strong bond. Each bond consists of one sigma bond and two pi bonds. Option A (1) is incorrect as a single bond involves one electron pair, while option B (2) is incorrect as a double bond consists of 2 electron pairs. Option D (4) is incorrect because a triple bond only involves 3 electron pairs being shared.

Correct Answer: A

Rationale: The correct answer is A: Unequal sharing of electrons. In a covalent bond, when two different atoms with different electronegativities come together, one atom attracts the shared electrons more strongly than the other, leading to an uneven distribution of electron density. This results in a dipole moment where one end of the bond is slightly positive and the other slightly negative. Choices B, C, and D are incorrect because in covalent bonds, electrons are not fully transferred or exchanged, but rather shared between atoms, leading to the creation of a dipole due to the unequal sharing of electrons.

Correct Answer: A

Rationale: The correct answer is A: 6.02 x 10^23. A mole is a unit used in chemistry to represent a specific number of particles, which is Avogadro's number, approximately 6.02 x 10^23. This number represents the number of atoms, ions, or molecules in one mole of a substance. It is a fundamental concept in chemistry for measuring quantities of substances. Choices B, C, and D have incorrect values for Avogadro's number, so they do not represent the correct definition of a mole.

Correct Answer: C

Rationale: The correct answer is C: Atomic mass. Atomic mass refers to the average mass of an element's isotopes as they occur in nature. This is calculated by taking into account the abundance of each isotope. The atomic number (A) is the number of protons in an atom's nucleus, not the average mass. The mass number (B) is the sum of protons and neutrons in an atom's nucleus, not the average mass. Neutron number (D) is simply the number of neutrons in an atom's nucleus, not the average mass. Therefore, the correct term for the average mass of isotopes is atomic mass.