NEVADA A GENERAL ENGINEERING PRACTICE
EXAM 2026 COMPREHENSIVE EXAM SCRIPT
WITH CORRECT ANSWERS GRADED A+
◉ Crystalline Solid ( molecules). Answer: Atoms of the same element
bond together to form molecules
◉ Covalent. Answer: Formed when atoms share electrons
◉ Ionic. Answer: Formed when an atom transfers an electron to
another atom
◉ Hydrogen Bond. Answer: A weak bond between a hydrogen atom
of one molecule an electronegative atom ( Nitrogen, oxygen, or
fluorine) of another molecule
◉ Valence layer. Answer: - Outermost layer of electron orbits
- Shares 8 electrons
- Molecules bond occurs at this layer
◉ Van der Waals Force. Answer: Weak force between molecules
( weaker than chemical bonds between atoms )
,◉ Nucleus ( Plural= Nuclei). Answer: - Consists of protons and
neutrons
- Positively charged
◉ Electrons. Answer: - Atomic particles
- number of electrons same as atomic number
- Negatively charged
- Orbit the nucleus of an atom ( Similar to how earth orbits the sun)
◉ Hadrons. Answer: Composed of quarks
◉ Protons. Answer: - Postively charged
- The number of protons = charge of the atom
◉ Neutrons. Answer: - No charge
- Uncharged atomic particles contained within the nucleus
◉ Atomic Number ( Proton Number). Answer: The number of
protons in the nucleus of an atom
- Determines number of an element in the periodic table
,- EX: Carbon Atoms, has 6 protons
AN = 6
◉ ions. Answer: when the number of protons and electrons are not
equal, an atom has a positive or negative charges.
◉ Neutral Charge. Answer: Atoms that have an equal number of
protons and electrons ( atomic number = number of electrons)
◉ Isotopes. Answer: Atoms of the same element that have different
mass number and different number of neutrons
◉ Nucleon. Answer: collective number of neutrons and protons
◉ Element. Answer: Matter with one type of atom
- It can be identified by its atomic number
- 117 elements
- 94 naturally on earth
◉ Electron Cloud. Answer: - An atomic model
- Relates the Earth as the nucleus and it's atmosphere as electrons
, - Model not to scale
◉ Not-to-scale solar system model. Answer: - An atomic model
- more accurate
- Nucleus with a diameter of 2 cm in a stadium
- electrons would be in the bleachers
◉ Atomic Radius. Answer: average distance between nucleus and
outermost electron
◉ Compounds. Answer: two or more different types of atoms bind
together chemically
◉ Physical and Chemical Properties. Answer: both physical change
and chemical reactions are everyday occurrences
PHYSICAL PROPERTIES: ( matter)
-Observed without changing matters identiy just a physical change
- when observing use 5 senses plus measure
EX: boiling point, melting point, & evaporation point
EXAM 2026 COMPREHENSIVE EXAM SCRIPT
WITH CORRECT ANSWERS GRADED A+
◉ Crystalline Solid ( molecules). Answer: Atoms of the same element
bond together to form molecules
◉ Covalent. Answer: Formed when atoms share electrons
◉ Ionic. Answer: Formed when an atom transfers an electron to
another atom
◉ Hydrogen Bond. Answer: A weak bond between a hydrogen atom
of one molecule an electronegative atom ( Nitrogen, oxygen, or
fluorine) of another molecule
◉ Valence layer. Answer: - Outermost layer of electron orbits
- Shares 8 electrons
- Molecules bond occurs at this layer
◉ Van der Waals Force. Answer: Weak force between molecules
( weaker than chemical bonds between atoms )
,◉ Nucleus ( Plural= Nuclei). Answer: - Consists of protons and
neutrons
- Positively charged
◉ Electrons. Answer: - Atomic particles
- number of electrons same as atomic number
- Negatively charged
- Orbit the nucleus of an atom ( Similar to how earth orbits the sun)
◉ Hadrons. Answer: Composed of quarks
◉ Protons. Answer: - Postively charged
- The number of protons = charge of the atom
◉ Neutrons. Answer: - No charge
- Uncharged atomic particles contained within the nucleus
◉ Atomic Number ( Proton Number). Answer: The number of
protons in the nucleus of an atom
- Determines number of an element in the periodic table
,- EX: Carbon Atoms, has 6 protons
AN = 6
◉ ions. Answer: when the number of protons and electrons are not
equal, an atom has a positive or negative charges.
◉ Neutral Charge. Answer: Atoms that have an equal number of
protons and electrons ( atomic number = number of electrons)
◉ Isotopes. Answer: Atoms of the same element that have different
mass number and different number of neutrons
◉ Nucleon. Answer: collective number of neutrons and protons
◉ Element. Answer: Matter with one type of atom
- It can be identified by its atomic number
- 117 elements
- 94 naturally on earth
◉ Electron Cloud. Answer: - An atomic model
- Relates the Earth as the nucleus and it's atmosphere as electrons
, - Model not to scale
◉ Not-to-scale solar system model. Answer: - An atomic model
- more accurate
- Nucleus with a diameter of 2 cm in a stadium
- electrons would be in the bleachers
◉ Atomic Radius. Answer: average distance between nucleus and
outermost electron
◉ Compounds. Answer: two or more different types of atoms bind
together chemically
◉ Physical and Chemical Properties. Answer: both physical change
and chemical reactions are everyday occurrences
PHYSICAL PROPERTIES: ( matter)
-Observed without changing matters identiy just a physical change
- when observing use 5 senses plus measure
EX: boiling point, melting point, & evaporation point
