化学
化学反応、化学量論、分子構造、元素の性質。
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question 3 of 15 consider the two reactions. 2nh₃(g) + 3n₂o(g) → 4n₂(g)…
$592$
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given that h₂(g) + f₂(g) → 2hf(g) δh°_rxn = -546.6 kj 2h₂(g) + o₂(g) → …
\(-521.6\)
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2a + b → 3c + d δh = 313 kj determine the enthalpy change, δh, for each…
\(-313\space kJ\) \(156.5\space kJ\) \(-939\space kJ\)
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lab data moles of magnesium (mol) 0.00058 verify your calculation. in y…
- Volume of hydrogen gas collected (\(L\)): \(0.01400\ L\) - Pressure of hydrogen gas (\(atm\)): \(0.99\ atm\) - Moles of hydrogen gas produced (\(mol\)): \(5.66\times 10^{-4}\ mo…
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过量agcl溶解在下列各种物质中，问哪种溶液中c(ag^{+})最小 a 100ml 0.2mol·l^{-1}kcl溶液 b 1000ml …
A. \(100mL\ 0.2mol\cdot L^{-1}KCl\) solution
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4. in still i rise, how does maya angelou emphasize the speakers determ…
C. repetition of a key phrase
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in 1986, the worlds worst nuclear power plant accident occurred at cher…
- The explosion caused a fire - A crew poured sand on the reactor. - Rainwater might have triggered another explosion - A crew built a concrete structure to seal the reactor. - Er…
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the napoleonic wars were a series of wars between france and other euro…
- Gunpowder was in demand - Courtois made saltpeter. - Wood ash wasn't available - Courtois used seaweed. - Courtois's business was in decline - Courtois manufactured iodine.
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use the text to compare and contrast acids and bases. an acid is define…
- Have a pH less than 7.0: Acids - Taste sour: Acids - Are usually solids: Bases - Change litmus paper to red: Acids
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how much heat in kj is required to convert 10.4 grams of ice at -19.9 c…
\(31.8\)
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how much heat in kj is required to convert 23.3 grams of ice at -27 cel…
18.9
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here are three equations for heat calculations: equation 1: $q = m\\del…
- When the substance is going from a gas to a liquid: equation 3 (since condensation is the reverse of vaporization, and the same enthalpy concept for the phase - change between g…
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how much heat in kilojoules is absorbed when 84.88 grams of carbon tetr…
\(1.81\)
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example: a 125.0 g sample of aluminum pellets at 215.0°c is added to 45…
\(94.2\)
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hot metal pellets at 150.0°c are added to water that is at 25.1°c. if 4…
\(4.41\space kJ\)
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how much heat in kilojoules must be absorbed by 375 grams of water to r…
39.2 kJ
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indicate if the process is exothermic or endothermic. the system is a h…
- The system is a house on a cold day: endothermic - The system are eggs cooking on a stove: endothermic - The system is liquid water in an ice cube tray in the freezer: exothermi…
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question 1 which substance will have the highest melting point? $\bigci…
\(C_{5}H_{9}Cl_{3}\) # Question 2
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which substance will have the highest melting point? c₂h₃cl₃ c₅h₉cl₃ c₃…
\(C_5H_9Cl_3\)
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question 3 identify the properties of a gas. □ compressible □ incompres…
compressible, no fixed volume, flows (no fixed shape), large space between particles
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question 2 identify the properties of a liquid. □ compressible □ large …
incompressible, fixed volume, flows (no fixed shape), small space between particles
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what are believed to have caused the steep cliff - like north and south…
early tectonic activity and tidal forces
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question 1 identify the properties of a solid. fixed volume small space…
fixed volume, small space between particles, incompressible, fixed shape
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which compounds can hydrogen bond? hcl ch₃och₃ hf ch₃oh nh₃
HF, \(CH_{3}OH\), \(NH_{3}\)
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question 1 which compounds will have dipole - dipole iaf. you will need…
\(SO_2\), \(CH_2F_2\)
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rank the following molecules by increasing strength of dispersion force…
\(CH_3CH_2CH_3\): \(4\) \(CH_3CH_2OCH_3\): \(2\) \(CH_3CH_2OCH_2CH_3\): \(3\) \(CH_3CH_2CH_2OCH_2CH_3\): \(1\)
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what are the intermolecular attractive forces. □ diarectic force □ inst…
C. Dispersion Force, D. hydrogen bonding, F. dipole - dipole
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when atoms are held together by a bond where one atom has taken possess…
ionic
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indicate the bond with the correct dipole moment. c⇌cl c+cl c+cl c⇌cl
C$\xleftarrow{~~}$Cl (the first option in the original problem's format where the arrow points from C to Cl)
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the following are simplified representations of three acids with the sa…
Solution A, Solution B, Solution C
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indicate the bonds with the proper delta notation. □δ⁻h−clδ⁺ □δ⁺h−clδ⁻ …
\(\delta^+ H - Cl \delta^-\), \(\delta^+ O - C \delta^-\)
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question 1 1 pts when the electrons in a bond are around one atom more …
True
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question # 2 multiple choice early toxicologists were at a disadvantage…
sensitive chemical tests and analytical instruments
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when the electrons in a bond are shared equally between two atoms the r…
True
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select the electron groupings that results in a bent molecule? -e- -e= …
\(-\ddot{E}-\), \(-\ddot{E}=\)
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select the electron groupings that results in a trigonal planar molecul…
\(-E-\), \(=E=\), \(\begin{array}{c}-E-\\|\end{array}\)
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select the electron groupings that result in a linear molecule? -e- -e-…
\(-E-\), \(-E\equiv\)
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question 1 match the electronic geometry to the number of electron doma…
Linear: 2 electron domains Trigonal Planar: 3 electron domains Tetrahedral: 4 electron domains
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the vsepr theory is based on the assumption that the molecule will take…
True
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what is the correct lewis diagram for the carbonate ion?
The second option (the one with a double bond to one oxygen and the \(2-\) charge in brackets) is correct.
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question 1 what is the sum of valence electrons for carbonate ion? 22 v…
\(24\) v.e.
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question 5 does every atom have an octet of electrons? yes no
B. No
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how many electrons remain after step 3 in so₂? subtract the used electr…
14 v.e.
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which structure has the central atom placed correctly? o-o-s o-o s o-s-o
\(O - S - O\)
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question 1 what is the sum of valence electrons in sulfur dioxide? (so₂…
18 v.e.
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if the octet rule is not satisfied, which is the correct position for t…
Use lone pair on sulfur.
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consider the flowing structure. all electrons have been distributed. qu…
Yes
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question 1 does every atom have an octet of electrons? yes no
B. No
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which structure of ccl₂o has the correct initial electron distribution …
The first structure (with \(\ce{::O::}\) above \(C\) and \(\ce{::Cl - C - ::Cl}\) with 3 lone pairs on each \(Cl\)) has the correct initial electron distribution.
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question 1 1 pts how many electrons remain after step 3 in ccl₂o? subtr…
18 v.e.
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which structure has the central atom placed correctly? c cl cl o cl o c…
The second - option structure (with \(C\) in the central position among \(O\), \(Cl\), \(C\), \(Cl\)) has the central atom placed correctly.
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what is the sum of the valence electron contributions of ccl₂o? 26 v. e…
\(24\) v.e.
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which elements lewis dot diagram is incorrect? li ·b· he: ·c· lithium h…
helium
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what are the two exception to the octet rule you must know in chem 3a? …
boron which can have 6 or 8 electrons, hydrogen which gets a duet (2)
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question 1 complete the statement. electronegativity is the force of at…
a pair of bonding electrons.
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question 1 which statement is correct? a triple bond consists of three …
A triple bond consists of one sigma and two pi bonds.
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2. when people talk about recreational drugs, what definition of \drugs…
nonfood chemicals that alter the way a person thinks, feels, functions, or behaves
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question 1 which statement is correct? a double bond consists of two si…
A double bond consists of one sigma and one pi bond.
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which is the correct orientation of a s to p single covalent bond. a b …
B
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which p orbital orientation represents the formation of a single covale…
B
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question 1 what is a covalent bond? a chemical bond involving the shari…
A. A chemical bond involving the sharing of valence electrons between two atoms.
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question 1 which element is closest to argon on the periodic table? sul…
neon
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an illegal sales technique in which a seller advertises a product with …
Bait and Switch
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what exists when there is only one producer or supplier of a product? c…
Monopoly
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multilevel marketing plans that promise distributors commissions * 2 po…
Pyramid Schemes
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a swindle in which additional repairs are urged when an advertised repa…
Bait and Switch
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when a merchant advertises a big sale, but keeps the items at regular p…
Fake Sales
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when producers conspire to set identical prices. * 2 points choose bait…
Price Fixing
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fraudulent investment operation that pays returns to its investors * 2 …
Ponzi Scheme
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method used to convince people to invest in phony investments or other …
Ponzi Scheme
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concentration of hydrobromic acid (m) 2.01 concentration of potassium h…
Moles of \(H^+\): \(0.187\space mol\); Moles of \(OH^-\): \(0.207\space mol\); Limiting Reactant: \(H^+\); \(\Delta H_{neutralization}\approx - 59.8\space kJ/mol\)
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use by advertisers of images and sounds to influence consumers * 2 poin…
Subliminal Advertising
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offering several products for sale as one combined product. * choose ba…
Bundling
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question 2 1 pts a compound is 31.1% s, the rest is chlorine. the compo…
\(S_2Cl_2\)
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question 1 1 pts a compound has an empirical formula bh₃ and a molar ma…
\(B_2H_6\)
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if v1 and v2 are given in ml and p1 is given in atm, and you are asked …
False
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a gas is a a collection of uniformly moving high energy molecules with …
B. collection of randomly moving high energy molecules with majority of the volume coming from intermolecular empty space
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the diagrams below show two pure samples of gas in identical closed, ri…
neither; their gas pressures are the same
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question the freezing point of methanol is - 97.6°c. what is the freezi…
\(-143.7^{\circ}F\)
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which si unit of length is most commonly used to indicate the radius of…
C. 1 nanometer (nm)
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which of the following statements is true about the atoms of any elemen…
A. All the atoms of a given element are identical in that they have the same number of protons.
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which statement is true about all the atoms of a given element? a they …
B. They can have a different number of protons.
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question which of the following is a rule of significant figures in cal…
C. Round down if the digit to be dropped is less than 5.
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balance the reactions and state the type of reaction described. 1. sodi…
1. \(2Na(s)+2H_2O(l) ightarrow H_2(g)+2NaOH(aq)\) 2. \(2NaCl(s)+H_2SO_4(aq) ightarrow 2HCl(g)+Na_2SO_4(aq)\) 3. \(2Al(s)+Fe_2O_3(s) ightarrow 2Fe(l)+Al_2O_3(s)\)
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complete the sentence with the past progressive form of the verb. sit f…
was sitting
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1. in a reading, you come across a lithium atom represented as li+. a *…
This lithium atom has lost an electron, so it now has 3 protons and 2 electrons.
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dahlia is trying to make partner at one of the citys most prestigious l…
norms.
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5. the medical dissection (incision) and examination of a body in order…
5. A. Autopsy 6. B. The document examiner must be cautious and allow only a forensic chemist to do the same after the consent of all parties in the case, including the court. 7. B…
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forfnsic chemistry and toxicology 1. in forensic toxicology, which of t…
1. C. Hair and bodily fluids 2. D. August Vollmer 3. B. Forensic Odontology
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which chemical equation correctly translates the description above? - a…
B. \(Ca(OH)_2(aq)+CO_2(g)\to CaCO_3(s)+H_2O(l)\)
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what does the symbol nacl(aq) mean? a gaseous sodium chloride b liquid …
C. a water - based solution of sodium chloride
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carbon dioxide gas reacts with liquid water to produce aqueous carbonic…
B. \(CO_2(g)+H_2O(l)\to H_2CO_3(aq)\)
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carbon dioxide gas reacts with liquid water to produce aqueous carbonic…
D. \(CO_{2}(g)+H_{2}O(l)\to H_{2}CO_{3}(aq)\)
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which of the following chemical equations shows the formation of sodium…
B. \(2Na + 2H_2O ightarrow2NaOH + H_2\)
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an equation that shows only the chemical formulas without trying to ind…
a. basic equation
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caco₃ (s) + 2hcl (aq) → cacl₂ (aq) + co₂ (g) + h₂o (l) in the chemical …
B. Solid, Liquid
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which chemical(s) are reactants in the following chemical equation? c +…
A. C, B. \(O_{2}\)
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which of the following might be included in a chemical reaction? check …
D. All of the above
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naoh (aq) + hcl (aq) → nacl (aq) + h₂o (l) in the chemical reaction abo…
B. \(H_2O\)
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which of the following equations is balanced? a $h_{2}+2o_{2}\\to 2h_{2…
d. \(2H_2+O_2 ightarrow2H_2O\)