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Stack #326997
| Question | Answer |
|---|---|
| Study of the composition and structure of materials and the changes that materials undergo best describes the science of? | chemistry |
| The branch of chemistry that in cludes the study of materials and process that occur in living things is.. | biochemistry |
| The branch of chemistry that is concerned with identification and composition of materials is.. | analytical chemistry |
| The study of substances containing carbon is | organic chemistry |
| The branch of chemistry concerned with the properties, changes, and relationships between energy and matter is.. | physical chemistry |
| Basic research is.. | carried out for the sake of increasing knowledge |
| a physical property my be investigated by... | melting ice |
| two features that destinguish matter are.. | mass and volume |
| An example of an extensive physical property is.. | mass |
| What is an example of an intesive physical property? | color |
| Quantitative observations are recorded using | numerical info |
| Qualitative obsevation are recorded using | non-numerical info |
| a testable statement used for making predictions and carrying out futher experiments is a | hypothesis |
| The Si units for length and mass are | meter and kilometer |
| the metric unit for length that is closest to the thickness of a dime is the | millimeter |
| the symbol for the metric unit used to measure mass is | g |
| the unit m^3 measures | volume |
| The SI base unit for time is the | second |
| A change in the force of Earths gravity on an object will affect it's | weight |
| To determine density, the quatities that must be measured are | volume and mass |
| Mendeleev noticed that properties of elements usually repeated at regular intervals when the elements were arranged in | atomic mass |
| what are the radioactive elements w/ atomic number from 90 to 103 in the periodic table called? | the actinides |
| The descovery of the noble gases changed mendeleeves periodic table by adding a new | group |
| what are the elements with atomic numbers from 58 to 71 in the periodic table called? | the lathanide elements |
| Elements in a group or column in the periodic table can be expected to have similar | properties |
| Mendeleev predicted that the spaces in his periodic table represented | undiscovered elements |
| Mendeleev attempted to organize the chemical elements based on thier | properties |
| in the modern periodic table, elements are ordered according to | increasing atomic number |
| The most useful soarce of general info about the elements for anyone associated with chemistry is a | periodic |
| 1/2 the distance btw the nuclei of identical atoms that are bonded 2gether is called the | atomic radius |
| Who was the school master who studied chem and proposed an atomic theory | John Dalton |
| A nuclear particle that has about the same mass as a proton, but with no electrical charge is called a | neutron |
| Rutherford fired positively charged particles at a metal foil and concluded that that most of the mass of an atom was | in the electrons |
| Who discovered the nucleus by bombarding gold foil with posetively charged particles? | Rutherford |
| Rutherford's experiments led to the discovery of the | nucleus |
| Experiments with discovery of the cathode rays led to the discovery of the | electron |
| The smallest unit of an element that can exist alone or in a combination with other such particles is an | atom |
| a positively charged particle is a | proton |
| The atomic number of oxygen,8, indicates that there are 8 | protons in the nucleus of an oxygen atom |
| All atoms of the same element have the same | atomic number |
| For electromagnetic radiation, c (speed of light) = | frequency times wavelength |
| In SI, the frequency of electromagnetic radiation is measured in | hertz |
| On eof the wave properties of electromagnetic radiation, such as light, is | frequency |
| As it travewls through space, electromagnetic radiation | exhibits wavelike behavior |
| The distance between two succesive peaks on a wave is its | wavelength |
| a quantum of electromagnetic energy is called a | photon |
| The wave model of light did not explain | the photoelectric effect |
| Mac PLank proposed that a hot object radiated energy in small, specific amounts called | quanta |
| the emission from electrons from metals that have absorbed photons is called the | photoelectric effect |
| For an electron in an atom to change from the ground state to an excited state | energy must be absorbed |
| Atoms are ___ when they are combined | more stable |
| When atoms share electrons, the electrical attraction of an atom for the electrons is called the atom's | electronegativity |
| If the atoms that share electrons have an unequal attraction for the electrons, the bond is called | polar |
| A covalent bond results when ___ are shared | electrons |
| A mutual electrical attraction between the nuclei and valence electrons of different atoms that binds the atoms together is called a | chemical bond |
| If two covalently bonded atoms are identical, the bond is | nonpolar covalent |
| the electrons in volved in the formation of a chemical bond are called | valence electrons |
| Most chemical bonds are | partly ionic and partly covalent |
| A chemical bond formed when two atoms share electrons is called a | covalent bond |
| An otet is = to | 8 |
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