CHM 1045 Exam 1 Study Questions Well
Answered.
What is chemistry? - Answer Chemistry is the study of matter, its properties, changes, and the
energy associated with those changes
What is matter? - Answer Anything that has mass and takes up space
States of matter - Answer solid, liquid, gas, plasma
Properties of a solid - Answer -Particles closely packed
-in an orderly array
-small vibrations around average position
-rigid shape, fixed volume
Properties of a liquid - Answer -random arrangement of particles, not confined, can float
around
-fixed volume but take shape of container
Properties of a gas - Answer -particles far apart and moving rapidly around
-volume varies with temperature, pressure, and size of container
Properties of plasma - Answer -gas of high temperature, dissociated atoms (loss of electrons)
-lots of charged particles
-RARE
What are some uses of chemistry? - Answer conquering diseases
energy (sustainable sources)
transportation
improve technology
environment
, Steps of the Scientific Method - Answer observation, read, hypothesis, experiment, analyze,
conclusion (report, peer review)
What is an atom? - Answer smallest particle of an element that has the properties of that
element
Law of Conservation of Matter - Answer Matter is not created nor destroyed in any chemical
or physical change (total mass of reactants=total mass of products)
What is a molecule? - Answer two or more atoms held together by chemical bonds into a
discrete unit with a specific stoichiometry/arrangement
What is a substance? - Answer A form of matter that has a definite or constant composition
and distinct properties (element or compound)
Types of substances - Answer elements and compounds
What is an element? - Answer a Substance that contains only ONE type of atom.
What is a compound? - Answer substance formed by the chemical combination of two or
more elements in definite proportions (fixed ratio)
What is a pure substance? - Answer cannot be separated into its elements by any physical
technique
What is a mixture? - Answer material composed of two or more elements or compounds that
are physically mixed together but not chemically combined
Types of mixtures? - Answer homogeneous and heterogeneous
What is a homogeneous mixture? - Answer a mixture in which the composition is uniform
throughout, but can be separated (SOLUTION)
What is a heterogeneous mixture? - Answer a mixture in which the composition is not uniform
Answered.
What is chemistry? - Answer Chemistry is the study of matter, its properties, changes, and the
energy associated with those changes
What is matter? - Answer Anything that has mass and takes up space
States of matter - Answer solid, liquid, gas, plasma
Properties of a solid - Answer -Particles closely packed
-in an orderly array
-small vibrations around average position
-rigid shape, fixed volume
Properties of a liquid - Answer -random arrangement of particles, not confined, can float
around
-fixed volume but take shape of container
Properties of a gas - Answer -particles far apart and moving rapidly around
-volume varies with temperature, pressure, and size of container
Properties of plasma - Answer -gas of high temperature, dissociated atoms (loss of electrons)
-lots of charged particles
-RARE
What are some uses of chemistry? - Answer conquering diseases
energy (sustainable sources)
transportation
improve technology
environment
, Steps of the Scientific Method - Answer observation, read, hypothesis, experiment, analyze,
conclusion (report, peer review)
What is an atom? - Answer smallest particle of an element that has the properties of that
element
Law of Conservation of Matter - Answer Matter is not created nor destroyed in any chemical
or physical change (total mass of reactants=total mass of products)
What is a molecule? - Answer two or more atoms held together by chemical bonds into a
discrete unit with a specific stoichiometry/arrangement
What is a substance? - Answer A form of matter that has a definite or constant composition
and distinct properties (element or compound)
Types of substances - Answer elements and compounds
What is an element? - Answer a Substance that contains only ONE type of atom.
What is a compound? - Answer substance formed by the chemical combination of two or
more elements in definite proportions (fixed ratio)
What is a pure substance? - Answer cannot be separated into its elements by any physical
technique
What is a mixture? - Answer material composed of two or more elements or compounds that
are physically mixed together but not chemically combined
Types of mixtures? - Answer homogeneous and heterogeneous
What is a homogeneous mixture? - Answer a mixture in which the composition is uniform
throughout, but can be separated (SOLUTION)
What is a heterogeneous mixture? - Answer a mixture in which the composition is not uniform
