ERSC 2220 - Enviro Chem Questions
with complete solution
exact - correct answer ✔any defined value or integer obtained from counting
number of objects
inexact numbers - correct answer ✔those whose values have some
uncertainty or limitations of measurement
Accuracy - correct answer ✔how close a measurement is to the true value
Precision - correct answer ✔The degree to which the measurement is
reproducible
adding and subtracting sig figs - correct answer ✔least number of decimal
places
multipling and dividing sig figs - correct answer ✔least number of sig figs
mass - correct answer ✔the quantity of matter that a sample contains
Volume - correct answer ✔space a given quantity of matter occupies
Kelvin scale - correct answer ✔no negative numbers, C + 273.15
Elements - correct answer ✔most basic form of matter that exists under
ordinary circumstances
, Compound - correct answer ✔A substance made up of atoms of two or more
different elements joined by chemical bonds
essential elements - correct answer ✔A chemical element required for an
organism to survive, grow, and reproduce.
Atoms - correct answer ✔Basic unit of matter
chemical compound - correct answer ✔composed of atoms of different
elements combined in small whole number ratio
chemical reaction - correct answer ✔rearrangement of atoms into different
combinations
Molecules - correct answer ✔Groups of two or more atoms held together by
chemical bonds
molecular compound - correct answer ✔molecules of atoms of two different
elements
covalent bond - correct answer ✔A chemical bond that involves sharing a
pair of electrons between atoms in a molecule
3 subatomic particles - correct answer ✔protons, neutrons, electrons
ionic compound - correct answer ✔A compound that consists of positive and
negative ions
with complete solution
exact - correct answer ✔any defined value or integer obtained from counting
number of objects
inexact numbers - correct answer ✔those whose values have some
uncertainty or limitations of measurement
Accuracy - correct answer ✔how close a measurement is to the true value
Precision - correct answer ✔The degree to which the measurement is
reproducible
adding and subtracting sig figs - correct answer ✔least number of decimal
places
multipling and dividing sig figs - correct answer ✔least number of sig figs
mass - correct answer ✔the quantity of matter that a sample contains
Volume - correct answer ✔space a given quantity of matter occupies
Kelvin scale - correct answer ✔no negative numbers, C + 273.15
Elements - correct answer ✔most basic form of matter that exists under
ordinary circumstances
, Compound - correct answer ✔A substance made up of atoms of two or more
different elements joined by chemical bonds
essential elements - correct answer ✔A chemical element required for an
organism to survive, grow, and reproduce.
Atoms - correct answer ✔Basic unit of matter
chemical compound - correct answer ✔composed of atoms of different
elements combined in small whole number ratio
chemical reaction - correct answer ✔rearrangement of atoms into different
combinations
Molecules - correct answer ✔Groups of two or more atoms held together by
chemical bonds
molecular compound - correct answer ✔molecules of atoms of two different
elements
covalent bond - correct answer ✔A chemical bond that involves sharing a
pair of electrons between atoms in a molecule
3 subatomic particles - correct answer ✔protons, neutrons, electrons
ionic compound - correct answer ✔A compound that consists of positive and
negative ions
