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 - Comprehensive Practice Q&A

Atomic Structure & The Periodic Table

1. What are the three fundamental subatomic particles?
A) Proton, neutron, isotope
B) Proton, electron, ion
C) Proton, neutron, electron ✓
D) Neutron, electron, molecule

2. The atomic number of an element represents the number of ______ in its nucleus.
A) Protons ✓
B) Neutrons
C) Electrons
D) Nucleons

3. Isotopes of an element have the same number of ______ but a different number of ______.
A) Electrons, protons
B) Protons, neutrons ✓
C) Neutrons, electrons
D) Protons, electrons

4. In the periodic table, elements are arranged in order of increasing:
A) Atomic mass
B) Atomic number ✓
C) Number of neutrons
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 group (vertical column) have similar chemical properties because
they have the same:
A) Atomic number
B) Number of electron shells
C) Number of valence electrons ✓
D) Atomic mass

7. Which subatomic particle is responsible for the chemical behavior of an element?
A) Proton
B) Neutron
C) Electron ✓
D) Nucleon

8. An ion is formed when an atom gains or loses:
A) Protons
B) Neutrons
C) Electrons ✓
D) Positrons

9. A cation is a(n):
A) Positively charged ion ✓
B) Negatively charged ion
C) Neutral atom
D) Isotope

10. An anion is a(n):
A) Positively charged ion
B) Negatively charged ion ✓
C) Neutral atom
D) Type of isotope

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 complete 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 nonpolar covalent bond
B) An ionic bond
C) A polar covalent 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(CO₃)₂
D) Ca₂CO₃

16. The correct name for N₂O₅ is:
A) Nitrogen oxide
B) Dinitrogen pentoxide ✓
C) Nitrogen pentoxide
D) Nitrous oxide

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) SO₄²⁻ ✓

19. The prefix "hexa-" in a molecular compound indicates how many atoms?
A) 4
B) 5
C) 6 ✓
D) 7

20. What is the formula for sulfuric acid?
A) H₂SO₃
B) H₂SO₄ ✓
C) HSO₄
D) H₂S

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. To balance a chemical equation, you change the:
A) Subscripts
B) Chemical formulas
C) Coefficients ✓
D) Atomic numbers

23. What are the products of a combustion reaction of a hydrocarbon?
A) CO₂ and H₂O ✓
B) CO and H₂
C) C and H₂O
D) CO₂ and H₂

24. In the reaction AgNO₃(aq) + NaCl(aq) → AgCl(s) + NaNO₃(aq), AgCl is the:
A) Reactant
B) Solvent