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Brooke Chemstry Exam
Brooke exam study guide(:
| Question | Answer |
|---|---|
| The branch of chemistry concerned with the properties, changes, andrelationships between energy and matter is | physical chemistry |
| Chemical properties... | include changes of state of a substance |
| Two features that distinguish matter are... | mass and volume |
| The melting of a candle wax is classified as a physical change because it... | produces no new substances |
| Based on there location in the periodic table oxygen and selenium have... | similar properties |
| The mosr useful source of chemical information about the elements is a... | periodic table |
| Which is NOT a property of metals? | unreactivity |
| Elements in a group in the periodic table can be expected to have similar | properties |
| A physical change occurs when a... | glue gun melts a glue stick |
| Basic Research is... | carried out for the sake of increasing knowlegde |
| A testable statement used for making predictions and carrying out further experiments is a | hypothesis |
| The symbol for the metric unit used to measure mass is | g |
| To determine density, the quantities that must be measured are | volume and mass |
| Poor precision in scientific measurement may arise from | both human error and the limitations of the measuring instrument |
| The number of significant figures in the measurment 0.000 305 kg is | 3 |
| The number that has five significants figures is... | 10.292 |
| The graph of a direct proportion is a... | straight line |
| Quantitatives observations are recorded using... | non-numerical information |
| How many minutes are in 1 week? | 10 080 min. |
| The SI base unit for time is the... | second |
| Who was the schoolmaster who studied chemistry and proposed an atomic theory? | John Dalton |
| Who discovered the nucleus by bombarding gold foil with positively charged particles? | Rutherford |
| The atomic number of oxygen,8, indicates that there are 8... | protons in the nucleus of an oxygen atom |
| What is the atomic number for aluminum? | 13 |
| What is the 218 in polonium-218 represent? | the mass number |
| What is the half-life of an isotope if 125 g of a 500 g sample of the isotope remain after 3.0 years? | 1.5 years |
| What Scientic discovered electrons? | J.J Thompson |
| In a glass tube, electrical current passes from the negative electrode, called the_________ to the other electrode. | cathode |
| What unit measures radiation? | rem |
| Who called the "atom" an atom? | J.J Thompson |
| A quantum of electromagnetic energy is called a... | photon |
| The wave model of light did not explain.. | the photoelectric effect |
| The part of the atom where the electrons CANNOT be found is the.. | nucleus |
| The total number of orbitals that can exist at the second main energy level is... | 4 |
| The main energy levels of an atom are indicated by the... | principle quantum numbers |
| Which group are the noble gases? | 18 |
| The main energy level that can hold only two electrons is the... | first |
| The SI, the frequency of electromagnetic radiation is measured in... | hertz |
| For an electron in an atom to change from the ground state to an excited state... | energy must be absorbed |
| For electromagnetic radiation, c equals... | frequency times wavelength |
| The atomic sublevel with the next highest energy after 4p is | 5s |
| Mendeleev attempted to organize the chemical elements based on their... | properties |
| To which group do lithium and potassium belong? | alkali metals |
| Argon, Krypton, and xenon are | noble gases |
| A horizontal row of blocks in the periodic table is called a... | period |
| The person whose work led to a periodic table based on increasing atomic number was | Moseley |
| The most characteristic property of the noble gases is that they | are largely unreactive |
| The energy required to remove an electron from an atom___________ as you move from left to right from potassium through iron. | generally increases |
| Valence electrons are those.... | in the highest energy level |
| A negative ion is known as a | anion |
| The elements in Group 1 are also known as the | alkali metals |
| Atoms are _________ when they combined | more stable |
| A covalent bond results when _______ are shared | electrons |
| An octet is equal to | 8 |
| If two covalently bonded atoms are identical, the bond is | nonpolar covalent |
| The electrons involved in the formation of a chemical bond are called | valence electrons |
| In drawing a Lewis structure, each nonmetal atom except hydrogen should be surrounded by | 8 electrons |
| Most chemical Bonds are | partly ionic and partly covalent |
| A neutral group of atoms held together by covalent bonds | molecules |
| The electron-sea model of bonding represents | metallic bonding |
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brooke12
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