mandas chem. exam Word Scramble
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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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