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chemistry exam

study of the compositon 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
the branch of chemistry that includes the study of materials and processes that occur in living things is biochemistry
the state of matter in which a material has neither a definite shape and definite volume is the gaseous state
under ordinary conditions of temperature and pressure, the particles in a gas are very far from each other
group_______ in the periodic table contains only metals 2
based on their location in the periodic table oxygen and selenium have similar properties
the most useful source of chemical information about the elements is a periodic table
a vertical column of blocks in the periodic table is called? group
Elements in a group in the periodic table can be expected to have similar properties
which of the following observations is quantitaive? the liquid boils at 100 degrees C
Quantitative observations are recorded using numerical information
Standards are chosen because they are reproducible in another laboratory
The SI standard units for length and mass are meter and kilogram
the symbol for the metric unit used to measure mass is g
the symbol that represents the measured unit for volume is ML
the SI base unit for time is the second
to determine density the quantities that must be measured are volume and mass
to calculate the density of an object divide its mass by its volume
poor precision in scientific measurement may arise from both human error and the limitations of the measuring instrument.
A nuclear particle that has about the same mass as a proton, but with no electrical charge, is called neutron
who discovered the nucleus by bombarding gold foil with positively charged particles? Rutherford
Experiments with cathode rays led to the discovery of the electron
the fact NaCl always consists of 39.34% Na and 60.66%Cl, is what law? Law of definite proportions
the smallest unit of an element that can exist alone or in combination with other such particles is an? atom
the atomic number of oxygen, 8, indicates that there are eight protons in the nucleus of an oxygen atom
what is the atomic number for aluminum? 13
How many half-lives are required for three-fourths of the nuclei of one isotope in a sample decay? 2
Particles or electromagnetic radiation emitted from the nucleus during radioactive decay is nuclear radiation
Gamma Rays are Electromagentic waves
The distance between two sucessive peaks on a wave is its Wavelength
An element with 8 electrons in its highest main energy level is a noble gas
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 highest energy after 4p is 5s
For an electron in an atom to change from the ground state to an excited state, energy must be absorbed
the number of orbitals for the d sublevel is 5
A quantum of electromagnetic energy is called a photon
For electromagnetic radiation, c (the speed of light) equals Frequency times wavelength
The main energy levels of an atom are indicated by the Principal quantum numbers
What are the radioactive elements with atomic numbers from 90 to 103 in the periodic table called? The actinides
The discovery of the noble gases changed Mendeleev's periodic table by adding a new group
What are the elements with atomic numbers from 58 to 71 in the periodic table called? The lanthanide elements
To which group do lithium and potassium belong? Alkali metals
Mendeleev predicted that the spaces in his periodic table presented Undiscovered elements
In the modern periodic table, elements are ordered according to increasing atomic number
The most useful source of general information about the elements for anyone associated with chemistry is a periodic table
Argon, Krypton, and Xenon are Noble gases
One-half the distance between the nuclei of identical atoms that are bonded together is called the atomic radius
To which group do fluorine and chlorine belong? Halogens
The electrons involved in the formation of a chemical bond are called Valence electrons
Most chemical bonds are Partly ionic and partly covalent
In a molecule of flourine, the two shared electrons give each flourine atom _____ electron(s) in the outer energy level 8
In drawing a Lewis structure, each nonmetal atom except hydrogen should be surrounded by 8 electrons
An octect is equal to 8
A compound that vaporizes readily at room temperature is most likely to be a(n) molecular formula
A ____ shows the types and numbers of atoms joined in a single molecular of a molecular compound Molecular formula
Created by: alden28