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SWilliams Chem Exam
Savanna Williams Chemistry Semester Exam
| 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 concerned with properties, changes, and relationships between energy and matter is... | physical chemistry. |
| Chemical properties... | include changes that alter the identity of a substance. |
| A physical change occurs when a... | glue gun melts a glue stick. |
| Physical means can be used to seperate... | mixtures. |
| The most useful source of chemical inforemation about the elements is a... | periodic table. |
| The elements that border the zigzag line in the periodic table are... | metalloids. |
| Applied research is... | carried out to solve a problem. |
| The state of matter in which a material has definte shape and definite volume is the... | solid state. |
| Quantitive observations are recorded using... | numerical information. |
| A testable statement used for mking predictions and carrying out further experiments is a... | hypothesis. |
| The symbol for the metric unit used to measure mass is... | grams (g). |
| A change is the force of Earth's gravity on an object will affect its... | weight. |
| 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 measuremnt 0.000 305 kg is... | three. |
| The number of significant fidures in the measurement 210 cm is... | two. |
| Three samples of 0.12 g, 1.8 g, 0.562 g are mixed together. The combined mass of all three samples, exrressed to the correct number of significant digits, shoudl be recorded as... | 2.5 g. |
| Expressed in scientific notation, 0.0930 m is... | 9.30 X 10^-2. |
| The graph of a direct proportion is a(n)... | straight line. |
| Who was the schoolmaster who studied chemistry and proposed an atomic theory? | John Dalton |
| Rutherford's experiments led to the discovery of the... | nucleus. |
| The discovery of the electron resulted from experiments using... | cathode rays. |
| What is the atomic number for Aluminum? | 13. |
| What does the 218 in Polonium-218 represent? | the mass number. |
| What has the greatest penetrating ability? | gamma rays. |
| What process always decreases the number of protons by an even number? | alpha decay. |
| Reactions that affect the nucleus of an atom are called... | nuclear reactions. |
| What unit measures radiation damage to human tissue? | rem. |
| What are often used to moniter the approximate radiation exposure of people working with radioactive materials? | film badges. |
| The distance between two sucessive peaks on a wave is its... | wavelength. |
| How many quantum numbers are needed to describe energy state of an electron in an atom? | four. |
| The atomic sublevel with the next highest enegry after 4p is... | 5s. |
| A quantum of electonmagnetic energy is caled a(n)... | photon. |
| For electronmagnetic radiation, c (the speed of light) equals... | frequency times wavelength. |
| One of the wave properties of electronmagnetic radiation, such as light, is... | frequency. |
| As it travels through space, electronmagnetic radiation... | exhibits wavelike behavior. |
| The spin quantum number of an electron can be thought of as descrbing... | the direction of electron spin. |
| How many electrons can occupy the s orbitals at each energy level? | two, if they have opposite spins. |
| a three dimensional region around a nucleus where an electron may be found is called a(n)... | orbital. |
| Mendeleev noticed that properties of elements usaullt repaeted at regular intervals when the elements were arranged in order of increasing... | atomic mass. |
| To which group do lithium and potassium belong? | alkali metals. |
| Argon, krypton, and xenon are... | noble gases. |
| A horizontal row of block in the periodic table is called a(n)... | period. |
| In Period 3 there are eight elements. What sublevel(s) is (are) being filled? | s and p. |
| Elements in which the d-sublevel is being filled have th properties of... | metals. |
| A postive ion is known as a(n)... | cation. |
| The energy required to remove an electron from an atom ... as you move left to right from potassium through iron. | generally increases. |
| What is the oxidation number of sulfur? | -2. |
| The electrons available to be lost, gained, or shared when atoms frorm molecules are called... | valence electrons. |
| A mutual electrical attraction between nuclei and valence electrons of different atoms that binds the atoms together is called a(n)... | chemical nond. |
| When atoms share electrons, the electrical attraction of an atom from the electrons is called the atom's... | electronegativity. |
| Most chemical bonds are... | partly ionic and partly covalent. |
| In many compounds, atoms of main-group elements form bonds so that the number of electrons in the outermost energy levels of each atom is... | eight. |
| An octect is equal to... | eight. |
| The elements of the ... group satisfy the octet rule without forming compunds. | noble gas. |
| Compared with ionic compounds and molecular compounds... | have lower melting points. |
| The elctron-sea model of bonding represnets... | metallic bonding. |
| Malleability and ductility are characteristics of substances with... | metallic bonds. |
| A covalent bond results when ... are shared. | electrons. |
| A ... shows the types and numbers of atoms joined in a single moecule of a molecular compound. | molecular formula. |
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savanna.nycole
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