CHEM 211 ACS EXAM FINAL QUESTIONS WITH CORRECT ANSWERS LATEST UPDATE
2026/2027
physical properties - Answers the characteristics of a substance that can be observed or
measured without changing the substance
- color
- melting point
-electrical conducivity
- density
physical change - Answers A change in a substance that does not involve a change in the
identity or composition of the substance
Chemical properties - Answers A characteristic of a substance that appears as it interacts with,
or transforms into, other substances.
- flammability
- corrisiveness
- reactivity with acids
chemical change/reaction - Answers A change in which one or more substances are converted
into one or more substances with different composition and properties.
Energy - Answers the ability to do work, to move matter.
Potential energy - Answers the energy an object has as a result of its position relative to other
objects or because of its composition.
Kinetic energy - Answers the energy an object has in motion.
what are the two concepts central to energy? - Answers 1. when energy is converted from one
form to another, it is conserved, not destroyed.
2. situations of lower energy are more stable and are favored over situations of higher energy,
which are less stable. Low energy > high energy
scientific method - Answers a process of creative proposals and testing aimed at objective,
verifiable discoveries of the cause of natural events.
- observation
, - hypothesis
- experiment
- model (theory)
- further experiment
SI units - Answers A unit composed of one or more of the base units of the Système
International d'Unités, a revised form of the metric system.
celsius scale - Answers freezing point: 0 C
boiling point: 100 C
Kelvin (absolute) scale - Answers The preferred temperature scale in scientific work, which has
absolute zero (0 K, or − 273.15°C) as the lowest temperature.
Fahrenheit scale - Answers The temperature scale on which water freezes at 32 degrees and
boils at 212 degrees
Celsius to Farenheit conversion formula - Answers F = 9/5( T in C) +32
Farenheit to Celsius - Answers C= 5/9 (F-32)
uncertainty - Answers a characteristic of every measurement that results from the inexactness
of the measuring device and the need to estimate when taking a reading.
- the greater the number of digits in the measuremnt the more certainty there is in the
measurement
precision - Answers (also reproducibility) The closeness of a measurement to other
measurements of the same phenomenon in a series of experiments.
accuracy - Answers The closeness of a measurement to the actual value.
systemic error - Answers produces values that ere neither all higher or all lower than the actual
value. caused by the experimental system, faulty device, or consistent mistakes.
random error - Answers in the absence of systemic errors, produces values that are higher or
lower than the actual value. Random error always occurs, but its size depends on the
measurer's skill and instrument precision.
conversion factors - Answers A ratio of equivalent quantities that is equal to 1 and used to
express a quantity in different units.
density - Answers density = mass/ volume
2026/2027
physical properties - Answers the characteristics of a substance that can be observed or
measured without changing the substance
- color
- melting point
-electrical conducivity
- density
physical change - Answers A change in a substance that does not involve a change in the
identity or composition of the substance
Chemical properties - Answers A characteristic of a substance that appears as it interacts with,
or transforms into, other substances.
- flammability
- corrisiveness
- reactivity with acids
chemical change/reaction - Answers A change in which one or more substances are converted
into one or more substances with different composition and properties.
Energy - Answers the ability to do work, to move matter.
Potential energy - Answers the energy an object has as a result of its position relative to other
objects or because of its composition.
Kinetic energy - Answers the energy an object has in motion.
what are the two concepts central to energy? - Answers 1. when energy is converted from one
form to another, it is conserved, not destroyed.
2. situations of lower energy are more stable and are favored over situations of higher energy,
which are less stable. Low energy > high energy
scientific method - Answers a process of creative proposals and testing aimed at objective,
verifiable discoveries of the cause of natural events.
- observation
, - hypothesis
- experiment
- model (theory)
- further experiment
SI units - Answers A unit composed of one or more of the base units of the Système
International d'Unités, a revised form of the metric system.
celsius scale - Answers freezing point: 0 C
boiling point: 100 C
Kelvin (absolute) scale - Answers The preferred temperature scale in scientific work, which has
absolute zero (0 K, or − 273.15°C) as the lowest temperature.
Fahrenheit scale - Answers The temperature scale on which water freezes at 32 degrees and
boils at 212 degrees
Celsius to Farenheit conversion formula - Answers F = 9/5( T in C) +32
Farenheit to Celsius - Answers C= 5/9 (F-32)
uncertainty - Answers a characteristic of every measurement that results from the inexactness
of the measuring device and the need to estimate when taking a reading.
- the greater the number of digits in the measuremnt the more certainty there is in the
measurement
precision - Answers (also reproducibility) The closeness of a measurement to other
measurements of the same phenomenon in a series of experiments.
accuracy - Answers The closeness of a measurement to the actual value.
systemic error - Answers produces values that ere neither all higher or all lower than the actual
value. caused by the experimental system, faulty device, or consistent mistakes.
random error - Answers in the absence of systemic errors, produces values that are higher or
lower than the actual value. Random error always occurs, but its size depends on the
measurer's skill and instrument precision.
conversion factors - Answers A ratio of equivalent quantities that is equal to 1 and used to
express a quantity in different units.
density - Answers density = mass/ volume
