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Exam Study Guide

study of composition and structure of materials and the changes that materials undergo best describes the science of chemistry
technology is the application of scientific knowledge to solve problems
a physical property may be investigated by melting ice
chemical properties include changes that alter the identity of a substance
based on its location in the periodic table you could infer that _______ is very unreactive Ar
a vertical cloumn of blocks in the periodic table is group
the elements that border the zigzag line in periodic table are metalliods
physical means can be used to seperate mixtures
group _____ in the periodic table contains only metals 2
which element has properties most similar of those to sodium? calcium
the state of matter in which a material has a definite volume but no definite shape is liquid state
the most appropriate SI unit for measuring the length of an automobile is the meter
poor precision in scientific measurements may arise from both human erroe and the limitations of the measuring instrument
the SI unit for time is the second
to calculate the density of an object divide its mass by its volume
the symbol that represets the measured unit for volume is mL
the unit m3 measures volume
the symbol for the metric unit used to measure mass is g
the standard SI units for length and mass are meter and kilogram
the metric unit for length that is closest to the thickness of a dime is the millimeter
what process always decreases the number of protons by an even number? Alpha decay
what is the atomic number of tungsten 74
how many significant digits are in 50.000005 2
this does not detect radiation radio active tracer
phosphorus-33 contains 18 neutrons
an atom of potassium has 19 protons and 20 neutrons, what is the mass number? 19
as the mass number of isotopes of an element increases the number of protons remains the same
reactions that affect the nucleus of an atom are called nuclear reactions
how many half-lives are required for 3/4 of the nuclei of 1 isotope in a sample of decay? 2
in a glass tube electrical current passes from the negative electrode called the _____ cathode
a quantum of electromagnetic energy is called photon
the emission of electrons from metals that have absorbed photons is called the photoelectric effect
the distance between two successive peaks on a wave is its wavelength
Max Plancsk proposed that a hot object radiated energy in small, specific amounts called quanta
for electromagnetic radiation c (the speed of light) equals frequency times wavelength
in SI, the frequency of electromagnetic radiation is measured in hertz
one of the wave propertied of electromagnetic radiation, such as light,is frequency
as it travels through space, electromagnetic radiation exhibits wavelike behavior
how many groups are found on the periodic table? 18
how many periods are found on the periodic table? 7
A horizontal row of blocks in the periodic table is called family
the electron configuration of aluminum, atomic number 13, is [NE} 3s2 3p1. Aluminum is in period 13
the principle that states that the physical and chemical properties of the elemtns are periodic functions of their atomis numbers is the periodic law
the person whose work led to a periodic table based on increasing atomic number was Moseley
to which group do flourine and chlorine belong? halogens
argon, krypton and xenon are noble gases
the most useful source of general information about the elements for anyone associated with chemistry is a periodic table
elements in a group or column in the periodic table can be expected to have similar properties
to which group do lithium and potassium belong? alkali metals
the energy required to remove an electron from an atom is the atom's ionization energy
the electron configuration of nitrogen is 1s2 2s2 2p3. how many more electrons does nitrogen need to satisfy the octect rule? 8
the substance whose lewis structure shows 3 covalent bonds is NH3
the elements of the _______ group satisfy the octect rule without forming compounds moble gas
an octect rule is equal to 3
a compound that vaporizes readily at room temperature is most likely to be an molecular compound
NOT a property of an ionic compound low boiling point
how many double bonds are in the lewis structure for hydrogen flouride, HF? none
if a material can be shaped or extended by physcal pressure, such as hammering, which property does the material have? malleability
the electron-sea model of bonding represents metallic bonding
atoms are _____ when they are combined more stable
Created by: hbales