CHEM 1211 - UNIT 1 EXAM QUESTIONS ANSWERED CORRECTLY LATEST UPDATE 2026
What is chemistry? - Answers The science that seeks to understand the behavior of matter by
studying the behavior of atoms and molecules.
What are atoms? - Answers The fundamental building blocks of matter.de
What are molecules? - Answers Structures formed by atoms bonded together, such as water (H2O).
What is a covalent bond? - Answers A chemical bond where atoms share electrons.
What is hydrogen bonding? - Answers A type of attractive interaction between a hydrogen atom and
an electronegative atom.
What does the Law of Conservation of Mass state? - Answers In a chemical reaction, matter is neither
created nor destroyed.
How is matter classified by state? - Answers Matter can be classified as solid, liquid, or gas based on
the arrangement and movement of atoms or molecules.
What is a pure substance? - Answers A material made up of only one component with invariant
composition. Made of the same thing. Could be different elements, but if they're in the same
molecular form it's a pure substance. For instance, a bunch of H2O molecules is a pure substance
despite there being two different elements, hydrogen and oxygen. There are two types - elements
and compounds.
What is an element? - Answers A substance whose atoms all have the same number of protons.
(TYPE OF PURE SUBSTANCE where it's all only one element - one color)
What is a compound? - Answers A substance formed when two or more chemical elements are
chemically bonded together. (TYPE OF PURE SUBSTANCE)
What is a mixture? - Answers A combination of two or more components that are not chemically
bonded. There are two types: homogeneous and heterogeneous.
What is a homogeneous mixture? - Answers A mixture that appears uniform throughout and has a
consistent composition.
What is a heterogeneous mixture? - Answers A mixture where the composition varies from one
region to another.
What are physical properties? - Answers Characteristics observed or measured without changing the
identity of a substance.
What is the difference between intensive and extensive properties? - Answers Intensive properties
do not depend on the amount of matter, while extensive properties do.
What is a physical change? - Answers A change that affects one or more physical properties of a
substance without altering its chemical composition.
What are chemical properties? - Answers Properties that describe a substance's ability to change into
new substances.
What is a chemical change? - Answers A change that results in the formation of new chemical
substances.
What is energy in the context of physical and chemical change? - Answers The capacity to do work,
which can transfer between objects as work or heat.
What is the law of conservation of energy? - Answers Energy is neither created nor destroyed; it can
only change forms.
What is kinetic energy? - Answers The energy an object possesses due to its motion.
What is potential energy? - Answers The stored energy of an object based on its position or state.
What is the significance of temperature in relation to kinetic energy? - Answers Temperature reflects
the level of kinetic energy in a substance; higher temperature indicates higher kinetic energy.
What is the role of observation and experiment in the scientific approach? - Answers They are
fundamental processes in forming hypotheses and developing scientific laws and theories.
What is a significant figure? - Answers A digit in a number that contributes to its precision.
What is the purpose of rounding in scientific calculations? - Answers To simplify numbers while
maintaining an appropriate level of precision.
What is thermal energy? - Answers The energy associated with the temperature of an object, a type
of kinetic energy.
What are the two most common unit systems in chemistry? - Answers The Metric system and the
English system.
What does SI stand for in measurement? - Answers International System of Units.
What is the SI unit for length? - Answers Meter (m).
What is chemistry? - Answers The science that seeks to understand the behavior of matter by
studying the behavior of atoms and molecules.
What are atoms? - Answers The fundamental building blocks of matter.de
What are molecules? - Answers Structures formed by atoms bonded together, such as water (H2O).
What is a covalent bond? - Answers A chemical bond where atoms share electrons.
What is hydrogen bonding? - Answers A type of attractive interaction between a hydrogen atom and
an electronegative atom.
What does the Law of Conservation of Mass state? - Answers In a chemical reaction, matter is neither
created nor destroyed.
How is matter classified by state? - Answers Matter can be classified as solid, liquid, or gas based on
the arrangement and movement of atoms or molecules.
What is a pure substance? - Answers A material made up of only one component with invariant
composition. Made of the same thing. Could be different elements, but if they're in the same
molecular form it's a pure substance. For instance, a bunch of H2O molecules is a pure substance
despite there being two different elements, hydrogen and oxygen. There are two types - elements
and compounds.
What is an element? - Answers A substance whose atoms all have the same number of protons.
(TYPE OF PURE SUBSTANCE where it's all only one element - one color)
What is a compound? - Answers A substance formed when two or more chemical elements are
chemically bonded together. (TYPE OF PURE SUBSTANCE)
What is a mixture? - Answers A combination of two or more components that are not chemically
bonded. There are two types: homogeneous and heterogeneous.
What is a homogeneous mixture? - Answers A mixture that appears uniform throughout and has a
consistent composition.
What is a heterogeneous mixture? - Answers A mixture where the composition varies from one
region to another.
What are physical properties? - Answers Characteristics observed or measured without changing the
identity of a substance.
What is the difference between intensive and extensive properties? - Answers Intensive properties
do not depend on the amount of matter, while extensive properties do.
What is a physical change? - Answers A change that affects one or more physical properties of a
substance without altering its chemical composition.
What are chemical properties? - Answers Properties that describe a substance's ability to change into
new substances.
What is a chemical change? - Answers A change that results in the formation of new chemical
substances.
What is energy in the context of physical and chemical change? - Answers The capacity to do work,
which can transfer between objects as work or heat.
What is the law of conservation of energy? - Answers Energy is neither created nor destroyed; it can
only change forms.
What is kinetic energy? - Answers The energy an object possesses due to its motion.
What is potential energy? - Answers The stored energy of an object based on its position or state.
What is the significance of temperature in relation to kinetic energy? - Answers Temperature reflects
the level of kinetic energy in a substance; higher temperature indicates higher kinetic energy.
What is the role of observation and experiment in the scientific approach? - Answers They are
fundamental processes in forming hypotheses and developing scientific laws and theories.
What is a significant figure? - Answers A digit in a number that contributes to its precision.
What is the purpose of rounding in scientific calculations? - Answers To simplify numbers while
maintaining an appropriate level of precision.
What is thermal energy? - Answers The energy associated with the temperature of an object, a type
of kinetic energy.
What are the two most common unit systems in chemistry? - Answers The Metric system and the
English system.
What does SI stand for in measurement? - Answers International System of Units.
What is the SI unit for length? - Answers Meter (m).
