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chemistry exam
| Question | Answer |
|---|---|
| what is a scientific hypothesis | a general, unproven statement derived from observations |
| which of the following statements about theories is incorrect | they are above question and should be accepted as stated |
| chemistry is the study of | all matter and changes it undergoes |
| the first step in the scientific method is | to ask a question |
| a scientific experiment must be | repeatable |
| the dependent variable in an experiment | shows changes during the experiment |
| the independent variable in an experiement | changes as the dependent variable is altered |
| a control group | is not exposed to the independent variable |
| data that includes numerical information or counted material is | quantitative data |
| what does the prefix milli- represent | 1/1000 |
| what is the symbol for milli | m |
| how many grams are in 5,280 mg | 5.28 g |
| the SI prefix for one hundredth (10⁻²) or 0.01 is | centi |
| how many meters are in 1 km | 1000 |
| the smallest particles into which a compound may be broken down without changing it into another substance are | molecules |
| any substance composed of only one type of atom is called an | element |
| a group of two or more atoms linked together by chemical bonds is called a | molecule |
| which of the following is a homogeneous mixture | solution |
| which of the following is not a chemical change | dissolving sugar in coffee |
| which of the following is a chemical property (substance is liquid at room temperature, substance is very dense, substance is combustible, substance is blue in color) | substance is combustile |
| one gallon of gasoline (3785) has a mass of 2540 g. what is the density of gasoline | 0.671 g/mL |
| the measurement 0.037010 m has how many significant digits | 5 |
| how many atoms of oxygen are there in a molecule of penicillin C17H20O4S | 4 |
| which of the following has the greatest amount of thermal energy(heat) | 1L of water at 98 C |
| which of the following is not a characteristic of solids | ease of compressibility |
| in the chemical formulas 10Al(C2H3)2)3, the number 3 is a | subscript |
| which of the following numbers does not have 4 significant digits | 2900 |
| convert 132000 cm to km and report answer in correct number of significant digits | 1.32 km |
| convert 450 mg to kg and report answer in correct number of significant digits | c |
| which of the following is not a monatomic element | hydrogen |
| italian salad dressing is an example of a | heterogeneous mixture |
| the phase change from gas to liquid is known as | condensation |
| who was the first to refer to the smallest particles composing matter as atoms? | democritus |
| how many electrons can a d sublevel hold | 10 |
| how many electrons can a f sublevel hold | 14 |
| which is the correct electron configuration for aluminum (atomic number 13) | 1s |
| which of the following sets of quantum numbers is impossible | 3, 2, -3, +1/2 |
| the sum of the number of neutrons and the number of protons is known as the | mass number |
| tritium is an isotope of hydrogen and has a mass number of 3. what is its isotopic notation | 31H |
| how many neutrons does the isotope 177,52Te have | 125 |
| what is the mass number of 120,80Hg | 120 |
| which of the following was not part of Dalton's atomic theory | elements are composed of tiny, indestructible spheres |
| the s, p, d, and f sublevels are identified by ____ quantum numbers | azimuthal (l) |
| the type of sublevel found in all principal energy levels is the ____ sublevel | s |
| the maximum number of electrons that can be found in any atom's second principal energy level is | 8 |
| 2 different isotopes of a single element would have the same number of ______ but a different number of ______ | protons, neutrons |
| which has the smallest mass? proton, electron, neutron, or nucleon | electron |
| a positively charged ion is called | cation |
| a negatively charged ion is called | anion |
| who arranged a number of the elements in triads, based on similar properties | dobereiner |
| what chemist arranged the elements according to increasing atomic masses and thereby discovering the relationship he called Law of Octaves | Newlands |
| who used the atomic number as the organizing factor for the elements in his version of the periodic table | Moseley |
| In general, where are the nonmetals located on the periodic table | the far right side |
| in general which groups of elements tend to have the strongest electron affinity | halogens |
| which scientist determined that gaps left in the periodic table belonged to undiscovered elements | Mendeleev |
| Mendeleev's periodic table arranged elements by | atomic mass |
| which is more electronegative | chlorine |
| it is the lightest and most abundant element in the universe | hydrogen |
| existing as diatomic molecules, this gas is tasteless, colorless, and odorless, and it accounts for approximately 78% of the earth's atmosphere | nitrogen |
| nitrogen, oxygen, chlorine, and krypton can be classified as | nonmetals |
| which of the following elements would you expect to have the greatest electronegativity (Li, Ba, B, F) | F |
| which of the following ions would you expect to have the largest radius (O, C, S, K) | K |
| which of the following elements is considered a typical metal? (Fe, Mg, Na, P) | Fe |
| Which of the following ions has the smallest electron affinity (K, Al, S, Si) | K |
| which of the following groups consists of elements that rarely undergo chemical reactions | noble gases |
| which of the following is not an alkali metal? | calcium |
| which of the following is classified as a halogen | Iodine |
| what type of bond would you expect in a compound of oxygen and sodium | ionic bond |
| what type of bond would you expect in a compound of carbon and oxygen | polar covalent bond |
| what type of bond would you expect in a compound of nickel and aluminum | metallic bond |
| the electron sea theory accounts for all of the following except | brittleness |
| a _______ bond shares 6 electrons | triple |
| an atom becomes more stable by bonding with another atom if the resulting electron configuration is more like that of which group of elements | noble gases |
| the electrons that are involved in bonding are called | valence electrons |
| the luster or shine seen on most metals is thought to be caused by the movement of | electrons |
| which of the following molecules has a bent shape (NH₃, CO₂, OF₂, CL₂CO) | OF2 |
| what theory explains the shape of molecules | VSEPR theory |
| which of the following shapes is always polar | bent |
| what is the shape of a molecule that has 4 electron concentrations, but only 3 of them are occupied by bonding pairs of electrons | pyramidal |
| which of the following compounds is polar? (NH₃, CH₄, Br₂, CO₂) | NH3 |
| the assumption that shapes are determined by the repulsions of regions of electron concentrations is known as the | VSEPR theory |
| which of the following molecules contains only single covalent bonds (SO₂, CICN, Cl₂O, F₂CO) | Cl2O |
| which of the following molecules contains one or more double covalent bonds? (N₂, HCN, CO₂, IBr) | CO2 |
| which of the following is not linear in shape? (CS2, HCL, BeF₂, H₂S) | H2S |
| all of the following are polar molecules except (CCL₄, NF₄, H₂0, HCN) | CCl₄ |
| all of the following are nonpolar molecules except? (F₂, CO₂, CH₃Cl, BF₃) | CH₃Cl |
| which of the following occurrences is not an indication that a chemical change has taken place | the colors change temporarily |
| which of the following does not represent a function of a balanced equation | indicates the quality of products and reactants |
| which of the following is not an example of a combination reaction | ZN+2HCL=> ZnCL₂+H₂ |
| the formulas on the left side of the arrow represent the substances known as the | reactants |
| the formulas on the right side of the arrow represent substances known as the | products |
| what is the oxidation number of H in MgH2 | -1 |
| what is the oxidation number of alkaline earth metals | +2 |
| what is the oxidation number of S in SCL2 | +2 |
| what is the oxidation number of P in CaP2 | +2 |
Created by:
dagnymoore