Question | Answer |
The bracnh of chemistry concerned with the properties, changes, and relationships between energy and matter is.. | physical chemistry |
basic research is | carried out for the sake of increasing knowledge |
chemical properties | include changes that alter the identity of a substance |
particles of a solid are | packed closely together |
which of the following is an intensive property | color |
state of matter in which a material has definite volume but no definite shape | liquid state |
an example of extensive physical property | mass |
physical occurs when | glue gun melts a glue stick |
most useful source of chemical information about the elements is a | periodic table |
verticle column of blocks in the periodic table is called | group |
qualitative observations are recorded using | non-numerical information |
testable statement used for making predictions and carrying out further experiments | hypothesis |
SI sandard units for length and mass are | meter and kilogram |
symbol for metric unit for mass is | g |
symbol that represents measured unit for volume is | mL |
SI base unit for time is the | second |
most appropriate SI unit for measuring the length of a car is the | meter |
change in the force of Earth's gravity on an object will affect its | weight |
how many minutes are in 1 week | 10 080 |
to determine density quantities that must be measured are | volume and mass |
gamma rays are | electromagnetic waves |
Phosphorus-33 cantains | 18 neutrons |
Nickel-60 has | 32 neutrons |
who called the atom an atom | Democritus |
discovery of electron rusulted from experiments using | cathode rays |
All atoms of the same element have the same | atomic number |
Atomic number of oxygen is 8, indicates there are 8... | protons |
what does the 218 in polonium-218 represent | the mass number |
what intrument detects radiation by counting electric pulses carried by ionized atoms | Geiger-Muller counters |
radioactive tracers are used to | follow movement of substances in system |
distance between two successive peaks on a wave is its | wavelength |
element with 8 electrons in its highest main energy level is a | noble gas |
emission of electrons from metals that have absorbed photons is called the | photoelectric effect |
how many quantum numbers are needed to describe the energy state of an electron in an atom | 4 |
which group are the noble gases | 18 |
what is the total number of electrons needed to fill the first two main energy levels | 10 |
the atomic sublevel with the next hishest energy after 4p is | 5s |
number of orbitals for d sublevel is | 5 |
Max Planck proposed that a hot object readiated energy in small specific amounts called | quanta |
a quantom of electromagnetic energy is called | photon |
the discovery of the noble gases changed Mendeleev's periodic table by adding a new | group |
to which group do lithium and potassium belong | alkali metals |
Medeleev attempted to organize the chemical elements based on their | properties |
most useful source of information about the elements is a | periodic table |
in the modern periodic table elements are ordered according to | increasing atomic number |
argon, krypton, and xenon are | noble gases |
to which group do chlorine and flourine belong | halogens |
horizontal row of blocks in the periodic table is called | period |
positive ion is known as | cation |
negative ion is known as | anion |
atoms are_______when they are combined | more stable |
when atoms atoms share electrons the electrical attraction of an atom for the electrons is called the atoms | electronegativity |
covalent bond results when ___________ are shared | electrons |
in many compounds atoms of main group elements form bonds so that the number of electrons in the outermost energy level is | 8 |
chemical bond resulting from the electrostatic attraction between positive and negative ions is called | ionic bond |
chemical bond formed when 2 atoms share electrons is called a | covalent bond |
a compound that vaporizes readily at room temperature is most likely to be a | molecular compound |
elements of the __________ group satisfy the octet rule without forming compounds | noble gases |
what is not a property of an ionic compund | low boiling point |
to draw a lewis structure one must know the | number of valence electrons in each atom |