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