WGU D425 INTRO TO CHEMISTRY OBJECTIVE ASSESSMENT ACTUAL EXAM 2025/2026 ACCURATE QUESTIONS WITH CORRECT DETAILED ANSWERS || 100% GUARANTEED PASS NEWEST VERSION

WGU D425 INTRO TO CHEMISTRY OBJECTIVE ASSESSMENT
ACTUAL EXAM 2025/2026 ACCURATE QUESTIONS WITH
CORRECT DETAILED ANSWERS || 100% GUARANTEED PASS
<NEWEST VERSION>
WGU D425 Intro to Chemistry - Practice Questions & Answers

Atomic Structure & The Periodic Table

1. What are the three fundamental subatomic particles?
a) Proton, ion, molecule
b) Proton, neutron, electron ✓
c) Neutron, isotope, cation
d) Electron, element, compound

2. The atomic number of an element represents the number of:
a) Neutrons in the nucleus
b) Protons in the nucleus ✓
c) Electrons in the outer shell
d) Protons and neutrons

3. Isotopes of an element have the same number of ______ but different numbers of
______.
a) electrons, neutrons
b) protons, electrons
c) protons, neutrons ✓
d) neutrons, protons

4. In the periodic table, elements are arranged in order of:
a) Atomic mass
b) Number of neutrons
c) Atomic number ✓
d) Density

5. Which group on the periodic table contains the noble gases?
a) Group 1
b) Group 2
c) Group 17
d) Group 18 ✓

, 6. Elements in the same vertical group (column) have:
a) The same number of electron shells
b) Similar chemical properties ✓
c) The same atomic number
d) The same number of neutrons

7. An atom that has gained or lost electrons is called a(n):
a) Isotope
b) Ion ✓
c) Molecule
d) Element

8. A cation is formed when an atom:
a) Gains electrons
b) Loses electrons ✓
c) Gains protons
d) Loses neutrons

9. The mass number of an atom is defined as:
a) The number of protons
b) The number of electrons
c) The number of protons plus neutrons ✓
d) The atomic weight

10. The electrons involved in chemical bonding are the:
a) Core electrons
b) Valence electrons ✓
c) Cationic electrons
d) Neutrons

Chemical Bonding & Nomenclature

11. What type of bond involves the sharing of electron pairs between atoms?
a) Ionic bond
b) Covalent bond ✓
c) Metallic bond
d) Hydrogen bond

12. What type of bond is formed by the transfer of electrons from one atom to another?
a) Ionic bond ✓
b) Covalent bond

, c) Metallic bond
d) Polar bond

13. In a water molecule (H₂O), the bond between oxygen and hydrogen is:
a) A pure covalent bond
b) A polar covalent bond ✓
c) An ionic bond
d) A metallic bond

14. What is the correct name for the compound NaCl?
a) Sodium chlorine
b) Sodium monochloride
c) Sodium chloride ✓
d) Monosodium chloride

15. What is the formula for calcium carbonate?
a) CaCO₃ ✓
b) CaC
c) Ca(CO)₃
d) Ca₂CO₃

16. The correct name for N₂O₅ is:
a) Nitrogen oxide
b) Dinitrogen pentoxide ✓
c) Nitrogen pentoxide
d) Pentanitrogen dioxide

17. What is the charge of a copper(II) ion?
a) +1
b) +2 ✓
c) -1
d) -2

18. Which of the following is a polyatomic ion?
a) Na⁺
b) Cl⁻
c) O²⁻
d) NO₃⁻ ✓

19. The correct name for FeCl₃ is:
a) Iron chloride

, b) Iron(I) chloride
c) Iron(III) chloride ✓
d) Ferrous chloride

20. Which of the following is a covalent compound?
a) KCl
b) MgO
c) CO₂ ✓
d) NaF

Chemical Reactions & Stoichiometry

21. What principle states that matter cannot be created or destroyed in a chemical reaction?
a) Law of Multiple Proportions
b) Law of Definite Proportions
c) Law of Conservation of Mass ✓
d) Avogadro's Law

22. A balanced chemical equation must have the same number of each type of atom on
both sides. This is a direct application of the:
a) Law of Constant Composition
b) Law of Conservation of Mass ✓
c) Ideal Gas Law
d) Pauli Exclusion Principle

23. In the reaction 2H₂ + O₂ → 2H₂O, how many moles of oxygen are needed to react with 4
moles of hydrogen?
a) 1 mole
b) 2 moles ✓
c) 4 moles
d) 8 moles

24. The numerical coefficient in front of a compound in a chemical equation indicates the:
a) Number of atoms
b) Number of molecules or moles ✓
c) Physical state
d) Reaction rate

25. What is the molar mass of water, H₂O?
a) 17 g/mol
b) 18 g/mol ✓