chemistry
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| 1.) A physical property may be investigated by | melting ice
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| 2.) basic research is | carried out for the sake of increasing knowledge
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| 3.) applied research is | carried out to solve a problem
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| 4.) group _ in the periodic table contains only metals | 2
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| 5.) an example of an extensive phusical property | color
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| 6.) the most useful ource of chemical information about thwe elements is a | periodic table
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| 7.) under ordinary conditions of temperature and pressure, the particles in a gas are | very far from each other
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| 8.) based on their location in the periodic table oxygen and selenium have | similar proporties
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| 9.) physical means can be used to seperate | mixtures
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| 10.) the state of matter in which a material has netiher a definite shape nor a definite volume is the | gaseous state
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| 11.) which of the following observation is quantitative? | the liquid boils at 100 C
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| 12.) a testable statement used for making predictions and carrying out further experiments is a | hypothesis
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| 13.) the symbol for the metric unit used to measure mass is | grams
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| 14.) the SI base unit for time is the | second
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| 15.) poor precision in scientific measurement may arise from | both human error and the limitations of the measuring instrument
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| 16.) the number of significant figures in the measurement 0.000305 kg is | 3
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| 17.) the number of significant figures in the measurement 170.040 km is | 6
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| 18.) standards are chosen because they | are reproducible in another laboratory
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| 19.) the symbol that represents the measured unit for volume is | mL
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| 20.) the metric unit for length that is closest to the thickness of a dime is the | millimeter
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| 21.) to determine density, the quantities that must be measured are | volume and mass
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| 22.) who was the schoolmaster who studied chemistry and proposed an atomic theory | john dalton
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| 23.) the smallest unit of an element that can exist alone or in combination with other such particles is an | atom
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| 24.) what is the atomis number for aluminum | 13
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| 25.) the discovery of the electron resulted from experiment using | cathrode rays
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| 26.) what does the 218 in polonium-218 represent | the mass number
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| 27.) the half life of an isotope is the time required for half the nuclei in a sample to | undergo radioactive decay
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| 28.) which of the following processes always decreases the number of protons by an even number? | alpha decay
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| 29.) a nuclear particale that has about the same mass as proton, but with no electrical charge, is called a | neutron
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| 30.) for the numbers lass than 0.1, sucha s 0.06, the zeros to the right of the decimal point but before the first nonzero digit | show the decimal place of the first digit
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| 31.) the measurement that has been expressed to four significant figures is | 30.00mm
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| 32.) an element with 8 electrons in its highest main energy level is a | noble gas
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| 33.) the emission of electrons from metals that have absorbed photons is called the | photoelectric effect
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| 34.) the region outside the nucleus where an electron can most probably be found is the | electron cloud
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| 35.) how many quantum numbers are needed to describe the energy state of an electron in an atom | 4
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| 36.) the wave model of light did not explain | the photoelectrical effect
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| 37.) the atomic sublevel with the next highest energy after 4p is | 5s
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| 38.) because excited hydrogen atoms always produce the same line emission spectrum, scientists concluded that hydrogen | released photons of only certain energies
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| 39.) a quantum of electromagnetic energy is called | photon
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| 40.) the main energy levels of an atom are indicated by the | primcipal quantum numbers
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| 41.) the main energy level that can hold only 2 electrons is the | first
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| 42.) one of the wave properties of electromagnetic radiation, such as light, is | freqency
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| 43.) for the f sublevel, the number of orbitals is | 7
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| 44.) as it travels throguh s[ace, electromagnetic radiaton | exhibits wavelike behavior
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| 45.) the total number of orbitals that can exist at the second main energy level is | 4
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| 46.) which of the following processes always decreases the number of protons by an even number? | alpha decay
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| 47.) a nuclear particale that has about the same mass as proton, but with no electrical charge, is called a | neutron
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| for the numbers lass than 0.1, sucha s 0.06, the zeros to the right of the decimal point but before the first nonzero digit | show the decimal place of the first digit
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| 49.) the measurement that has been expressed to four significant figures is | 30.00mm
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| 50.) an element with 8 electrons in its highest main energy level is a | noble gas
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| the emission of electrons from metals that have absorbed photons is called the | photoelectric effect
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| the region outside the nucleus where an electron can most probably be found is the | electron cloud
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| 53.) how many quantum numbers are needed to describe the energy state of an electron in an atom | 4
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| 54.) the wave model of light did not explain | the photoelectrical effect
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| 55.) the atomic sublevel with the next highest energy after 4p is | 5s
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| because excited hydrogen atoms always produce the same line emission spectrum, scientists concluded that hydrogen | released photons of only certain energies
🗑
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| a quantum of electromagnetic energy is called | photon
🗑
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| the main energy levels of an atom are indicated by the | primcipal quantum numbers
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| the main energy level that can hold only 2 electrons is the | first
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| one of the wave properties of electromagnetic radiation, such as light, is | freqency
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| for the f sublevel, the number of orbitals is | 7
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| 62.) as it travels throguh s[ace, electromagnetic radiaton | exhibits wavelike behavior
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| the total number of orbitals that can exist at the second main energy level is | 4
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| which of the following processes always decreases the number of protons by an even number? | alpha decay
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| 65.) a nuclear particale that has about the same mass as proton, but with no electrical charge, is called a | neutron
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| 66.) for the numbers lass than 0.1, sucha s 0.06, the zeros to the right of the decimal point but before the first nonzero digit | show the decimal place of the first digit
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| the measurement that has been expressed to four significant figures is | 30.00mm
🗑
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| an element with 8 electrons in its highest main energy level is a | noble gas
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| 69.) the emission of electrons from metals that have absorbed photons is called the | photoelectric effect
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| 70.) the region outside the nucleus where an electron can most probably be found is the | electron cloud
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| 71.) how many quantum numbers are needed to describe the energy state of an electron in an atom | 4
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| the wave model of light did not explain | the photoelectrical effect
🗑
|
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| the atomic sublevel with the next highest energy after 4p is | 5s
🗑
|
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| because excited hydrogen atoms always produce the same line emission spectrum, scientists concluded that hydrogen | released photons of only certain energies
🗑
|
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| a quantum of electromagnetic energy is called | photon
🗑
|
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| the main energy levels of an atom are indicated by the | primcipal quantum numbers
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| 77.) the main energy level that can hold only 2 electrons is the | first
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| one of the wave properties of electromagnetic radiation, such as light, is | freqency
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| for the f sublevel, the number of orbitals is | 7
🗑
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| as it travels throguh s[ace, electromagnetic radiaton | exhibits wavelike behavior
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| the total number of orbitals that can exist at the second main energy level is | 4
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