Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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multiple choice question an electric current is a _. o resistance to th…
flowing or moving charge
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multiple choice question lons always have o the same number of protons …
an unequal number of protons and electrons
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consider the following set of quantum numbers: ( n = 2 ), ( l = 1 ), ( …
D. \(m_s = 0\)
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effective nuclear charge, z_{eff}, is defined as answer: the number of …
D. the true nuclear charge minus the charge that is shielded by electrons.
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which of the following elements would be chemically similar to calcium …
B. Sr
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multiple choice question lons are formed when o neutrons are ejected fr…
atoms either gain additional electrons or give up existing electrons
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which of the following is not permitted as a plausible orbital designat…
C. \(2d\)
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multiple choice question electrical, light, and chemical phenomena invo…
electrons
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which of the following is a halogen? answer: a sodium b copper c neodym…
E. iodine
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a single electron in an orbital has quantum numbers ( n = 2,ell = 0,m_{…
B. \(n = 2\), \(l = 0\), \(m_l=0\), \(m_s =-\frac{1}{2}\)
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a ground state atom of ar could not have any electrons with which of th…
B. \(n = 4,l = 2,m_{l}=0,m_{s}=+\frac{1}{2}\)
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5. list the four variables that define an electron according to quantum…
Principal quantum number ($n$), angular momentum quantum number ($l$), magnetic quantum number ($m_l$), spin quantum number ($m_s$)
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boundaries are the divisions between two physical conditions. boundarie…
the same material with different conditions
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multiple choice question sound is transmitted in air as longitudinal wa…
air molecules are not attached to one another and therefore cannot transmit transverse waves
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fill in the blank question sound waves in air must be waves since air m…
longitudinal
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fill in the blank question a thermodynamic measure of disorder is refer…
entropy
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multiple choice question with molecules continuously moving between the…
The number of molecules either leaving or entering the liquid
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multiple choice question the transition of a liquid to a gas or a solid…
phase change
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a liquid may turn to a gas at any temperature through the process of al…
Evaporation
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classify the following compound as covalent (molecular) or ionic: al₂o₃
B. ionic
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for the following electron configuration, identify the element and dete…
B. Zn, ground state
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true or false: two electrons can simultaneously occupy the same (n, l, …
A. true
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given ( n = 2 ), identify which of the quantum numbers is not possible.…
C. \( m_l=-2 \)
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which of the following orbitals cannot exist? answer: a 2p b 3d c 4d d …
D. \(3f\)
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fill in the blank question the quantity of heat associated with a phase…
latent
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fill in the blank question when a substance transitions between being a…
physical change
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multiple choice question liquids evaporate relatively low temperatures …
some of the liquid's molecules have high enough energy to escape into the surrounding atmosphere as a gas
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halogens tend to form anions because answer: a losing electrons will fi…
B. gaining electrons will fill their octet faster than losing them.
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if $\\ell = 0$, which of the following may be true? answer: a $n = 6$ b…
A. \(n = 6\)
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multiple choice questions answer the following multiple choice question…
1. D. To separate mixtures into their individual components 2. B. Solid phase 3. D. To find out what's in our water, food, and bodies 4. D. Parts that stick more to the stationary…
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multiple choice question which of the following is true regarding the l…
It is used to break molecule - to - molecule bonds.
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true or false question true or false: the phase change between a liquid…
False
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multiple choice question the transition of a liquid to a gas or a solid…
phase change
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multiple choice question conduction is a transfer of energy that occurs…
through the interaction of molecules
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fill in the blank question the transfer of heat due to the movement of …
convection
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which of the following are key experimental variables that are systemat…
The initial concentration of \(H_2O_2\), The initial concentration of \(KI\)
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multiple choice question the transfer of energy from one molecule to an…
conduction
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a student calculates the rate constant, k, for a reaction at two differ…
Increasing the temperature increases the reaction rate.
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question 8 of 10 points possible: 1.00 what is the balanced chemical eq…
\(2H_2O_2 ightarrow 2H_2O + O_2\) (the second option in the given choices)
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question 7 of 10 points possible: 1.00 what is the function of the gas …
To monitor the increase in pressure over time as \(O_2\) gas is produced by the reaction.
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to change the state of an object, for example, from a solid to a liquid…
heat
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question 6 of 10 points possible: 1.00 a student mixes 5.0 ml of 3.0% h…
\(0.064\)
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what is the purpose of performing run 4 at a lower temperature (approx.…
To collect data at a different temperature in order to calculate the activation energy (\(E_a\)).
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how is the initial rate of the reaction measured in this experiment? se…
By finding the slope of the steepest part of the pressure vs. time graph.
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a student compares the initial rate of run 1 (10 ml h₂o₂) to the initia…
The reaction is first - order in \(H_2O_2\).
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fill in the blank question the of a substance is a measure of the avera…
temperature
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what is the role of potassium iodide (ki) in the decomposition of hydro…
It is a catalyst that speeds up the rate of the decomposition reaction.
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question 1 of 10 points possible: 1.00 what is the primary purpose of c…
To collect the data needed to determine the rate law and activation energy for the reaction.
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multiple choice question the molecules in a ______ flow over each other…
liquid
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q: long - standing hypertension is the most common cause of heart failu…
B. Pressure Overload → Left Ventricular Hypertrophy → Myocardial Fibrosis.
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a student is given a data table to characterize several unknown substan…
Color, Boiling Temperature, Density.
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multiple choice question the molecules in a ____ are at regular distanc…
solid
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an unknown liquid is colorless and has a sweet, butterscotch - like odo…
Ethyl acetate
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when your group designs a procedure to identify your unknown, what is t…
To select a procedure that measures a physical property that will effectively distinguish your unknown from the other possibilities.
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why does the lab manual ask you to review your procedures from the \syn…
Because the techniques you used in "Synthesis and Analysis of Alum", such as measuring melting point or solubility, are the same types of procedures you might propose for identify…
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multiple choice question while the word temperature is commonly used to…
the measure of the average kinetic energy of the molecules in a substance
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a student is trying to identify an unknown solid. they find that it is …
tert - butanol
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a data table lists the solubility of cyclohexane in water as os\. what …
Not observably soluble
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when considering the interaction of molecules, is the attractive force …
First blank: Cohesion; Second blank: Adhesion
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your group is given a colorless liquid unknown. you measure its boiling…
ter - butanol or 2 - propanol
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multiple choice question oxygen is an example of a(n)____, whereas wate…
element; compound
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which of the following is not a physical property? select one: density …
Flammability
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question 6 1 pts what is the function of the lymphatic system? returns …
C. all of these
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what is the primary objective of the \synthesis and analysis of alum in…
To design an experiment that uses physical properties to identify an unknown substance.
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a student is given a data table to characterize several unknown substan…
Density, Color, Mass, Boiling Temperature
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an unknown liquid is colorless and has a sweet, butterscotch - like odo…
Ethyl acetate
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when your group designs a procedure to identify your unknown, what is t…
To select a procedure that measures a physical property that will effectively distinguish your unknown from the other possibilities.
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why does the lab manual ask you to review your procedures from the \syn…
Because the techniques you used in "Synthesis and Analysis of Alum", such as measuring melting point or solubility, are the same types of procedures you might propose for identify…
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a student is trying to identify an unknown solid. they find that it is …
tert - butanol
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a data table lists the solubility of cyclohexane in water as os\. what …
Not observably soluble
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according to the \synthesis and analysis of alum investigations - proce…
Develop a specific, researchable question about how to identify it.
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question 1 1 pts antibody molecules have all of these characteristics. …
have all of these characteristics.
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your group is given a colorless liquid unknown. you measure its boiling…
tert - butanol or 2 - propanol
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which of the following is not a physical property? select one: density …
Flammability
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what is the primary objective of the \synthesis and analysis of alum in…
To design an experiment that uses physical properties to identify an unknown substance.
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in part iv, \determining the percent sulfate,\ you add barium nitrate t…
Barium sulfate ($BaSO_4$)
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what piece of equipment is used with a filter flask and a vacuum source…
A Büchner funnel
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3. if a substance is only one type of atom, it is an __________________…
element
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question 7 of 10 points possible: 1.00 not yet answered in the final st…
Alum is less soluble in the ethanol solution than in pure water, which minimizes the amount of product that dissolves and gets lost during washing.
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a student places 2.500 g of their hydrated alum crystals in a crucible.…
1.140 g
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in part iii, determine the water of hydration, why is the crucible heat…
To ensure all of the water of hydration has been driven off as vapor.
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in step 9 of the synthesis, why is the beaker of solution placed in an …
To greatly decrease the solubility of alum in water, causing it to crystallize out of the solution.
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question 3 of 10 points possible: 1.00 a student starts with 1.00 g of …
85.7%
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what is the chemical formula for the alum you are synthesizing, also kn…
\(KAl(SO_{4})_{2}\cdot12H_{2}O\)
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what eventually happens to a sound wave traveling through the air? mult…
Its energy becomes dispersed as random molecular motion.
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does sound travel faster in cold air or warm air? it travels faster in …
warm air because molecules are moving faster and therefore carry information faster.
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17 which of the following has more entropy? multiple choice liquid wate…
water vapor
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a burn on your arm from 100°c steam is more severe than a burn from 100…
\(100^{\circ}C\) steam contains more energy (\(540\) cal/g) than \(100^{\circ}C\) water.
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which dating method is useful for dating the remains of organisms that …
radiocarbon dating
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why does a glass filled with a cold beverage seem to \sweat\? multiple …
The cold glass cools adjacent air to saturation, which is followed by condensation of water vapor.
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on a molecular level, how does the condensation of water vapor on a bat…
The latent heat is released during vapor - to - liquid phase changes.
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a food calorie is (check all that apply.) check all that apply the same…
All the options are correct. - the same thing as a kilocalorie. - equivalent to 1,000 calories. - a measure of the chemical energy released by the oxidation of food.
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air is a good insulator because (check all that apply.) check all that …
All the options are correct. - a gas does not transfer heat very well because the molecules are far apart. - conduction takes place slowly in a gas. - gas molecules are not attach…
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materials become less dense as their temperature is increased because m…
Increased energy results in molecules moving farther apart.
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8. sodium (na) and chlorine (cl) form the ionic compound table salt. de…
Sodium donates one electron to chlorine. Sodium becomes \(Na^{+}\) and chlorine becomes \(Cl^{-}\). The electrostatic attraction between them forms NaCl (table salt).
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a measure of the average kinetic energy of the molecules making up a su…
temperature.
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a(n) ______ refers to the most likely or most commonly thought of examp…
Prototype
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part b correct the false sentences from the part a. the ( mathrm{fe}^{2…
The \(Fe^{2+}\) ion contains 26 protons and 24 electrons.
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determine the true statements. check all that apply. the li+ ion contai…
The \(Li^{+}\) ion contains 3 protons and 2 electrons.
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use the periodic table to decode each halloween clue. write the chemica…
\(S + P+O + O+K + Y = SPOOKY\)