Chem 101 UNC Final latest exam
review 2026
1A: Distinguish between the classes of matter - correct answer
Matter
✅1. Classes of
- Pure substances: These are forms of matter that have a constant composition
and distinct chemical properties. They can be elements or compounds.
- Elements: Substances that cannot be broken down into simpler substances by
chemical means. Oxygen, Carbon, Gold.
- Compounds: Substances that can be broken down into simpler substances by
chemical reactions. They are made of two or more elements in a fixed proportion.
Ex: H2O, CO2.
2. Mixtures: Combinations of two or more substances in which each substance
retains its own chemical identity. Mixtures can be homogeneous( uniform
composition, salt water) or heterogenous (salad).
correct answer ✅
1A: Distinguish between the physical and chemical properties of pure substances -
1. Physical Properties: These are characteristics that can be
observed or measured without changing the substances chemical identity.
- Color
- Melting/ Boiling Point
- Density
- Solubility
- State of Matter
2. Chemical Properties: These properties describe a substance's ability to undergo
changes that transform it into different substances. These involve chemical
reactions and cannot be observed by merely viewing or touching the substance.
- Reactivity with other chemicals
- Flammability
,Chem 101 UNC Final latest exam
review 2026
- Oxidation States
- Decomposition Temperature
- combustion of natural gas
1B: Describe the states of matter - correct answer
liquid, and gas.
✅ States of Matter: Solid,
- Solids: In solids, particles are tightly packed together in a fixed arrangement,
usually in a regular, repeating patter known as crystal lattice. The particles vibrate
but do not move from their fixed positions. The structure gives solids a definite
shape and volume.
- Liquid: Particles are still close together but not in a fixed arrangement, they can
move past of slide against eachother, this allows liquid to flow and take the shape
of their container.
Gas: Particles are much farther apart and move freely in all directions. This
freedom allows gases to expand to fill the shape and volume of their container.
Gases are compressible because there is alot of empty space between particles.
explained by the particulate nature of matter - correct answer ✅
1B: Describe the states of matter and how their physical properties can be
- Solid: Strong
interparticle forces, particles are held together by strong intermolecular forces,
which limit their movement. Low energy, the particles have lower kinetic energy.
- Liquid: Moderate interparticle forces, the intermolecular forces are strong
enough to keep particles close but not in fixed positions, allowing them to move
around. Intermediate kinetic energy, lower than gas energy.
- Gas: Weak interparticle forces, particles in a gas experience very weak or
negligible intermolecular forces, allowing them to move freely. High energy in
kinetic energy.
,Chem 101 UNC Final latest exam
review 2026
1C: Use molecular formulas and molecular models to describe the elemental
✅
composition and 3D arrangement of the atoms in compounds - correct answer
Molecular Formulas: a way of representing the composition of a compound.
- Element Symbols: Each element in the compound is represented by its chemical
symbol. Hydrogen is H.
- Subscripts: H2O. Indicates there are two hydorgens.
- No Subscript indicates there is 1.
Molecular Models: visually represent the three-dimensional arrangement of
atoms in a compound.
- Ball and Stick Model
3D arrangement: The spatial arrangement in a molecule is crucial. CH4 is a
tetrahedral structure.
Phase Changes: - correct answer ✅ - Sublimation: Solid to Gas
- Melting: Solid to Liquid
- Vaporization: Liquid to Gas
- Condensation: Gas to Liquid
- Freezing: Liquid to Solid
- Deposition: Gas to Solid
1D: Interpret physical scale of SI units - correct answer ✅- Mass: Kilogram (Kg)
- Length: meter (m)
- Temperature: Kelvin (K)
- Time: Second (s)
- Quantity of a substance: mole (mol)
, Chem 101 UNC Final latest exam
review 2026
Derived Units - correct answer ✅ speed: Distance/Time
volume: (distance)^3
density: mass/volume
energy: Joule
Power: watt
1E: Use proportionality to "reprefix" metric units - correct answer ✅
-Terrible
Guys Make Kooky Husbands. Dashing Dudes can make monsters, not perfect
friends.
-Tetra Giga Mega Kilo Hecta Deka Deci Centi Mili Micro Nano Pico Femto
- 12, 9, 6, 3, 2, 1, -1, -2, -3, -6, -9,-12, -15
1F: Distinguish between exact and uncertain values and express uncertain values
✅
with the
appropriate number of significant figures - correct answer 1. Exact Values:
numbers that are known with complete certainty. They are often the result of
defined quantities. Ex, 1 kg= 1000 grams, or 1 dozen= 12 items. No sig figs
because they are not subject to measurement uncertainty.
2. Uncertain Values: numbers that involve some degree of measurement
uncertainty. Measured lengths: like 5.34 cm, 20.1 g, or a time of 30.2 s. Are
expressed with sig figs, reflects the precision of the measurement.
1F: Sig Fig Rules - correct answer
(5 sf)
✅ - All non-zero digits are significant. eg, 123.45
- Any zero between sig figs are significant. eg, 1002 (4 sig figs)
review 2026
1A: Distinguish between the classes of matter - correct answer
Matter
✅1. Classes of
- Pure substances: These are forms of matter that have a constant composition
and distinct chemical properties. They can be elements or compounds.
- Elements: Substances that cannot be broken down into simpler substances by
chemical means. Oxygen, Carbon, Gold.
- Compounds: Substances that can be broken down into simpler substances by
chemical reactions. They are made of two or more elements in a fixed proportion.
Ex: H2O, CO2.
2. Mixtures: Combinations of two or more substances in which each substance
retains its own chemical identity. Mixtures can be homogeneous( uniform
composition, salt water) or heterogenous (salad).
correct answer ✅
1A: Distinguish between the physical and chemical properties of pure substances -
1. Physical Properties: These are characteristics that can be
observed or measured without changing the substances chemical identity.
- Color
- Melting/ Boiling Point
- Density
- Solubility
- State of Matter
2. Chemical Properties: These properties describe a substance's ability to undergo
changes that transform it into different substances. These involve chemical
reactions and cannot be observed by merely viewing or touching the substance.
- Reactivity with other chemicals
- Flammability
,Chem 101 UNC Final latest exam
review 2026
- Oxidation States
- Decomposition Temperature
- combustion of natural gas
1B: Describe the states of matter - correct answer
liquid, and gas.
✅ States of Matter: Solid,
- Solids: In solids, particles are tightly packed together in a fixed arrangement,
usually in a regular, repeating patter known as crystal lattice. The particles vibrate
but do not move from their fixed positions. The structure gives solids a definite
shape and volume.
- Liquid: Particles are still close together but not in a fixed arrangement, they can
move past of slide against eachother, this allows liquid to flow and take the shape
of their container.
Gas: Particles are much farther apart and move freely in all directions. This
freedom allows gases to expand to fill the shape and volume of their container.
Gases are compressible because there is alot of empty space between particles.
explained by the particulate nature of matter - correct answer ✅
1B: Describe the states of matter and how their physical properties can be
- Solid: Strong
interparticle forces, particles are held together by strong intermolecular forces,
which limit their movement. Low energy, the particles have lower kinetic energy.
- Liquid: Moderate interparticle forces, the intermolecular forces are strong
enough to keep particles close but not in fixed positions, allowing them to move
around. Intermediate kinetic energy, lower than gas energy.
- Gas: Weak interparticle forces, particles in a gas experience very weak or
negligible intermolecular forces, allowing them to move freely. High energy in
kinetic energy.
,Chem 101 UNC Final latest exam
review 2026
1C: Use molecular formulas and molecular models to describe the elemental
✅
composition and 3D arrangement of the atoms in compounds - correct answer
Molecular Formulas: a way of representing the composition of a compound.
- Element Symbols: Each element in the compound is represented by its chemical
symbol. Hydrogen is H.
- Subscripts: H2O. Indicates there are two hydorgens.
- No Subscript indicates there is 1.
Molecular Models: visually represent the three-dimensional arrangement of
atoms in a compound.
- Ball and Stick Model
3D arrangement: The spatial arrangement in a molecule is crucial. CH4 is a
tetrahedral structure.
Phase Changes: - correct answer ✅ - Sublimation: Solid to Gas
- Melting: Solid to Liquid
- Vaporization: Liquid to Gas
- Condensation: Gas to Liquid
- Freezing: Liquid to Solid
- Deposition: Gas to Solid
1D: Interpret physical scale of SI units - correct answer ✅- Mass: Kilogram (Kg)
- Length: meter (m)
- Temperature: Kelvin (K)
- Time: Second (s)
- Quantity of a substance: mole (mol)
, Chem 101 UNC Final latest exam
review 2026
Derived Units - correct answer ✅ speed: Distance/Time
volume: (distance)^3
density: mass/volume
energy: Joule
Power: watt
1E: Use proportionality to "reprefix" metric units - correct answer ✅
-Terrible
Guys Make Kooky Husbands. Dashing Dudes can make monsters, not perfect
friends.
-Tetra Giga Mega Kilo Hecta Deka Deci Centi Mili Micro Nano Pico Femto
- 12, 9, 6, 3, 2, 1, -1, -2, -3, -6, -9,-12, -15
1F: Distinguish between exact and uncertain values and express uncertain values
✅
with the
appropriate number of significant figures - correct answer 1. Exact Values:
numbers that are known with complete certainty. They are often the result of
defined quantities. Ex, 1 kg= 1000 grams, or 1 dozen= 12 items. No sig figs
because they are not subject to measurement uncertainty.
2. Uncertain Values: numbers that involve some degree of measurement
uncertainty. Measured lengths: like 5.34 cm, 20.1 g, or a time of 30.2 s. Are
expressed with sig figs, reflects the precision of the measurement.
1F: Sig Fig Rules - correct answer
(5 sf)
✅ - All non-zero digits are significant. eg, 123.45
- Any zero between sig figs are significant. eg, 1002 (4 sig figs)
