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study of the composition and structure of materials and the changes that materials undergo best describes the science of chemistry
the branch of chemistry that is concerned with the identification and composition of materials is physical chemistry
basic research is carried out for the sake of increasing knowledge
applied research is carried out to solve problems
a physical property may be investigated by melting ice
chemical properties include changes that alter the identity of a substance
a horizontal row of blocks in the periodic table is called a period
the most useful source of chemical information about the elements is a periodic table
elements in a group in the periodic table can be expected to have similar properties
a vertical column of blocks in the periodic table is called a group
which of the following observations is quantitive liquid boils at 100'C
quantitive observations are recorded using numerical information
qualitive observations are recorded using nonnumerical information
a testable statement used for making predictions and carrying out further expiraments is hypothesis
all of the following are examples of units except weight
the symbol for the metric unit used to measure mass is g
the unit m3 measures volume
the symbol that represents the measured unit for volume is mL
the SI base unit for time is the second
a change in the force of gravity on an object will affect its weight
who was the schoolmaster who studied chemistry and proposed an atomic theory john dalton
rutherford fired positivly charged particles at metal foil and concluded that most of the mass of an atom was concentrated in the nucleus.
isotopes of an element contain different numbers of neutrons
the smallest unit of an element that can exist alone or in a combination with other such particles is an atom
the atomic number of oxygen 8 indicates that there are 8 protons in the nucleus of an oxygen atom
all atoms of the same element have the same atomic number
what is the atomic number for aluminum 13
the half life of an isotope is the time required for half the nuclei in a sample to undergo radioactive decay
which of the following has the greatest penatrating ability gamma rays
gamma rays are electromagnetic waves
an element with 8 electrons in its highest main energy level is noble gas
the emission of electrons from metals that have absorbed protons is called the photoelectric effect
the region outside the nucleus where an electron can most probably be found is the electron cloud
how many quantum numbers are needed to describe the energy state of an electron in an atom 4
the wave model of light did not explain the photoelectric effect
which group are the noble gases 18
what is the toal number of electrons needed to fill the first two main energy levels 10
the atomic sublevel with the next highest energy after 4p is 5s
the number of orbitals for the d sublevel is 5
max planck proposed that a hot object radiated energy in small amounts called quanta
which group do lithium and potassium belong in alkali metals
elements in a group or colomn in the periodic table can be expected to have similar properties
mendeleev predicted that the spaces in his periodic table represented undiscovered elements
mendeleev attempted to organize the chemical elements based on their properties
in the moderen periodic table elements are ordered according to increasing atomic number
argon krypton and xenon are noble gases
which group do flourine & clorine belong in halogens
a horizontal row of blocks in the periodic table is called a period
the person whose work led to a periodic table based on increasing atomic number was mosely
elements in the d sublevel is being filled have the properties of metals
atoms are when they are combined more stable
when atoms share electrons the electrical attraction of the atom for the electrons is called the atoms electronegativity
if the atoms that share electrons have an unequal attraction for thye electrons the bond is called polar
a covalent bond results when are shared electrons
a mutaul electrical attraction between the nuclei and valence electrons of different atoms that binds the atoms together is called chemical bond
in many compounds atoms of main group elements form bonds so that the number of electrons in the outermost energy levels of each atom is 8
if two covalently bonded atoms are identical the bond is nonpolar covalent
a chemical bond resulting from the electrostatic attraction between positive and negative ions is called ionic bond
the electrons involved in the formation of a chemical bond are called valence electrons
most chemical bonds are partly ionic partly covalent
Created by: marwhee