WGU D425 INTRO TO CHEMISTRY TEST EXAM
WITH QUESTIONS AND 100% CORRECT
ANSWERS || LATEST AND COMPLETE VERSION
2025-2026 WITH EXPERT VERIFIED SOLUTIONS
|| ASSURED PASS
1. What is a subatomic particle that has a negative charge? -
ANSWER: Electron
2. What is a prescribed decimal place that determines the amount of rounding
off to be done based on the precision of the measurement? -
ANSWER: significant figures
3. What is the sum of the number of neutrons and protons in an atomic
nucleus? - ANSWER: mass number
4. What does amu stand for? - ANSWER: atomic mass unit
5. Which subatomic particle has a positive charge? - ANSWER: Protons
6. The atomic number of an element is the total number of which particles in
the nucleus? - ANSWER: protons
7. What is the formula for calculating average atomic mass? -
ANSWER: (mass)(%)+(mass)(%)/100 (% in decimal)
8. What is the distance from the center of an atom's nucleus to its outermost
electron? - ANSWER: atomic radius
9. How many electrons can energy level 2 hold? - ANSWER: up to 8
electrons
,10.How many electrons can energy level 3 hold? - ANSWER: up to 18
electrons
11.What is a diagram of a molecule using dots to represent valence electrons? -
ANSWER: Lewis Dot Structure
12.What are groups of atoms with an overall charge? - ANSWER: polyatomic
ions
13.What are the components of organic molecules that are most commonly
involved in chemical reactions? - ANSWER: functional groups
14.How many electrons can energy level 1 hold? - ANSWER: up to 2
electrons
15.What is a hydrocarbon containing only single covalent bonds? -
ANSWER: Alkane
16.What hydrocarbon contains a carbon-carbon triple bond? -
ANSWER: Alkyne
17.What hydrocarbon contains a carbon-carbon double bond? -
ANSWER: Alkene
18.What is the mass of one mole of a pure substance (1:1 ratio with atomic
mass, in g/mol)? - ANSWER: molar mass
19.What is the ideal gas law equation? - ANSWER: PV=nRT
20.What is the volume occupied by 1 mole of a gas at standard temperature and
pressure (STP)? - ANSWER: molar volume
21.Any gas at STP has the volume of? - ANSWER: 22.4 L
, 22.What type of chemical change involves an exchange of positive ions
between two compounds? - ANSWER: double replacement reaction
23.What is the charge of a neutron? - ANSWER: neutral (no charge)
24.What is the nucleus of an atom composed of? - ANSWER: protons and
neutrons
25.What is the maximum number of electrons in the first energy level (n=1)? -
ANSWER: 2
26.What is the maximum number of electrons in the third energy level (n=3)? -
ANSWER: 18
27.What is the maximum number of electrons in the fourth energy level (n=4)?
- ANSWER: 32
28.What is the term for atoms of the same element with different numbers of
neutrons? - ANSWER: isotopes
29.What is the charge of an ion formed when a sodium atom loses one electron?
- ANSWER: +1
30.What is the charge of an ion formed when a chlorine atom gains one
electron? - ANSWER: -1
31.What type of bond involves the sharing of electrons? - ANSWER: covalent
bond
32.What type of bond involves the transfer of electrons? - ANSWER: ionic
bond
33.What is the name of the law that states mass is neither created nor destroyed
in a chemical reaction? - ANSWER: law of conservation of mass
WITH QUESTIONS AND 100% CORRECT
ANSWERS || LATEST AND COMPLETE VERSION
2025-2026 WITH EXPERT VERIFIED SOLUTIONS
|| ASSURED PASS
1. What is a subatomic particle that has a negative charge? -
ANSWER: Electron
2. What is a prescribed decimal place that determines the amount of rounding
off to be done based on the precision of the measurement? -
ANSWER: significant figures
3. What is the sum of the number of neutrons and protons in an atomic
nucleus? - ANSWER: mass number
4. What does amu stand for? - ANSWER: atomic mass unit
5. Which subatomic particle has a positive charge? - ANSWER: Protons
6. The atomic number of an element is the total number of which particles in
the nucleus? - ANSWER: protons
7. What is the formula for calculating average atomic mass? -
ANSWER: (mass)(%)+(mass)(%)/100 (% in decimal)
8. What is the distance from the center of an atom's nucleus to its outermost
electron? - ANSWER: atomic radius
9. How many electrons can energy level 2 hold? - ANSWER: up to 8
electrons
,10.How many electrons can energy level 3 hold? - ANSWER: up to 18
electrons
11.What is a diagram of a molecule using dots to represent valence electrons? -
ANSWER: Lewis Dot Structure
12.What are groups of atoms with an overall charge? - ANSWER: polyatomic
ions
13.What are the components of organic molecules that are most commonly
involved in chemical reactions? - ANSWER: functional groups
14.How many electrons can energy level 1 hold? - ANSWER: up to 2
electrons
15.What is a hydrocarbon containing only single covalent bonds? -
ANSWER: Alkane
16.What hydrocarbon contains a carbon-carbon triple bond? -
ANSWER: Alkyne
17.What hydrocarbon contains a carbon-carbon double bond? -
ANSWER: Alkene
18.What is the mass of one mole of a pure substance (1:1 ratio with atomic
mass, in g/mol)? - ANSWER: molar mass
19.What is the ideal gas law equation? - ANSWER: PV=nRT
20.What is the volume occupied by 1 mole of a gas at standard temperature and
pressure (STP)? - ANSWER: molar volume
21.Any gas at STP has the volume of? - ANSWER: 22.4 L
, 22.What type of chemical change involves an exchange of positive ions
between two compounds? - ANSWER: double replacement reaction
23.What is the charge of a neutron? - ANSWER: neutral (no charge)
24.What is the nucleus of an atom composed of? - ANSWER: protons and
neutrons
25.What is the maximum number of electrons in the first energy level (n=1)? -
ANSWER: 2
26.What is the maximum number of electrons in the third energy level (n=3)? -
ANSWER: 18
27.What is the maximum number of electrons in the fourth energy level (n=4)?
- ANSWER: 32
28.What is the term for atoms of the same element with different numbers of
neutrons? - ANSWER: isotopes
29.What is the charge of an ion formed when a sodium atom loses one electron?
- ANSWER: +1
30.What is the charge of an ion formed when a chlorine atom gains one
electron? - ANSWER: -1
31.What type of bond involves the sharing of electrons? - ANSWER: covalent
bond
32.What type of bond involves the transfer of electrons? - ANSWER: ionic
bond
33.What is the name of the law that states mass is neither created nor destroyed
in a chemical reaction? - ANSWER: law of conservation of mass
