chemistry exam
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| study of the compositon and structure of materials and the changes that materials undergo best describes the science of? | chemistry
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| technology is the | application of scientific knowledge to solve problems
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| the branch of chemistry that includes the study of materials and processes that occur in living things is | biochemistry
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| the state of matter in which a material has neither a definite shape and definite volume is the | gaseous state
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| under ordinary conditions of temperature and pressure, the particles in a gas are | very far from each other
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| group_______ in the periodic table contains only metals | 2
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| based on their location in the periodic table oxygen and selenium have | similar properties
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| the most useful source of chemical information about the elements is a | periodic table
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| a vertical column of blocks in the periodic table is called? | group
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| Elements in a group in the periodic table can be expected to have similar | properties
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| which of the following observations is quantitaive? | the liquid boils at 100 degrees C
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| Quantitative observations are recorded using | numerical information
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| Standards are chosen because they | are reproducible in another laboratory
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| The SI standard units for length and mass are | meter and kilogram
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| the symbol for the metric unit used to measure mass is | g
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| the symbol that represents the measured unit for volume is | ML
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| the SI base unit for time is the | second
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| to determine density the quantities that must be measured are | volume and mass
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| to calculate the density of an object | divide its mass by its volume
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| poor precision in scientific measurement may arise from | both human error and the limitations of the measuring instrument.
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| A nuclear particle that has about the same mass as a proton, but with no electrical charge, is called | neutron
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| who discovered the nucleus by bombarding gold foil with positively charged particles? | Rutherford
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| Experiments with cathode rays led to the discovery of the | electron
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| the fact NaCl always consists of 39.34% Na and 60.66%Cl, is what law? | Law of definite proportions
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| the smallest unit of an element that can exist alone or in combination with other such particles is an? | atom
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| the atomic number of oxygen, 8, indicates that there are eight | protons in the nucleus of an oxygen atom
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| what is the atomic number for aluminum? | 13
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| How many half-lives are required for three-fourths of the nuclei of one isotope in a sample decay? | 2
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| Particles or electromagnetic radiation emitted from the nucleus during radioactive decay | is nuclear radiation
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| Gamma Rays are | Electromagentic waves
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| The distance between two sucessive peaks on a wave is its | Wavelength
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| An element with 8 electrons in its highest main energy level is a | noble gas
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| Which group are the Noble gases? | 18
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| What is the total number of electrons needed to fill the first two main energy levels? | 10
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| The atomic sublevel with the next highest energy after 4p is | 5s
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| For an electron in an atom to change from the ground state to an excited state, | energy must be absorbed
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| the number of orbitals for the d sublevel is | 5
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| A quantum of electromagnetic energy is called a | photon
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| For electromagnetic radiation, c (the speed of light) equals | Frequency times wavelength
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| The main energy levels of an atom are indicated by the | Principal quantum numbers
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| What are the radioactive elements with atomic numbers from 90 to 103 in the periodic table called? | The actinides
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| The discovery of the noble gases changed Mendeleev's periodic table by adding a new | group
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| What are the elements with atomic numbers from 58 to 71 in the periodic table called? | The lanthanide elements
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| To which group do lithium and potassium belong? | Alkali metals
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| Mendeleev predicted that the spaces in his periodic table presented | Undiscovered elements
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| In the modern periodic table, elements are ordered according to | increasing atomic number
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| The most useful source of general information about the elements for anyone associated with chemistry is a | periodic table
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| Argon, Krypton, and Xenon are | Noble gases
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| One-half the distance between the nuclei of identical atoms that are bonded together is called the | atomic radius
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| To which group do fluorine and chlorine belong? | Halogens
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| The electrons involved in the formation of a chemical bond are called | Valence electrons
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| Most chemical bonds are | Partly ionic and partly covalent
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| In a molecule of flourine, the two shared electrons give each flourine atom _____ electron(s) in the outer energy level | 8
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| In drawing a Lewis structure, each nonmetal atom except hydrogen should be surrounded by | 8 electrons
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| An octect is equal to | 8
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| A compound that vaporizes readily at room temperature is most likely to be a(n) | molecular formula
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| A ____ shows the types and numbers of atoms joined in a single molecular of a molecular compound | Molecular formula
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Created by:
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