Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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tag all the carbon atoms with pi bonds in this molecule. if there are n…
The two carbon atoms in the $C = C$ double bond should be tagged.
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answer the questions in the table below about the shape of the methane …
How many electron groups are around the central carbon atom? 4 What phrase best describes the arrangement of these electron groups around the central carbon atom? tetrahedral
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missed this? read section 4.4 (page); watch kcv 4.4, iwe 4.6. consider …
2
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answer the questions in the table below about the shape of the amide (n…
4 tetrahedral
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in the following molecule, determine whether c6 is $sp^{2}$ - or $sp^{3…
$sp^{2}$
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part 3 of 3 sigma bond(s): pi bond(s):
Sigma bond(s): 10 Pi bond(s): 3
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question 22 of 34 (1 point) | question attempt: 1 of 1 how many sigma b…
Part 1: Sigma bond(s): 4 Pi bond(s): 0 Part 2: Sigma bond(s): 5 Pi bond(s): 1
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specify which hybrid orbitals are used by carbon in co.
sp
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consider the molecular shape of sulfur trioxide (so₃). select the singl…
Part 1 of 2: Trigonal planar Part 2 of 2: $sp^{2}$
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serotonin is a neurotransmitter involved in mood and emotional regulati…
$C_{10}H_{12}N_{2}O$
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using the vsepr model, predict the molecular geometry of asbr₅. select …
trigonal bipyramidal
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use the vsepr method to predict the molecular geometry of n₂o (arrangem…
linear
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using the vsepr model, predict the molecular geometry of alf₃ (bent, li…
trigonal planar
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is the molecule polar or nonpolar? select the single best answer. polar…
Polar
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is the molecule polar or nonpolar? select the single best answer. polar…
Nonpolar
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part 3 of 3 identify the most important resonance structure. select the…
:N≡N—S:
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for each resonance form, determine the formal charge for each atom. str…
Structure 1: Formal charge for N (left) = 0 Formal charge for N (center) = 1 Formal charge for S = 0 Structure 2: Formal charge for N (left) = 0 Formal charge for N (center) = 1 F…
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identify the possible resonance structure(s) for n2s. check all that ap…
$\ddot{N}=S=\ddot{N}:$, $:N\equiv S-\ddot{N}:$, $\ddot{N}-N=\ddot{S}:$, $\ddot{N}-S\equiv N:$, $:N\equiv N-\ddot{S}:$
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on the basis of their positions in the periodic table, write the chemic…
Part 1: Cs Part 2: Sr Part 3: Bi Part 4: Br
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explain which of these ions is larger, and why: cu⁺ or cu²⁺. part: 0 / …
Part 1 of 2: Cu⁺ Part 2 of 2: Because Cu⁺ has one more electron than Cu²⁺.
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explain which of these ions is larger, and why: cu⁺ or cu²⁺. part: 0 / …
$\text{Cu}^{+}$
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list the following ions in order of increasing ionic radius: sr^{2 +}, …
$Sr^{2+}<Rb^{+}<Br^{-}<Se^{2 - }<As^{3 - }$
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highlight the smallest atom in group 16 of the periodic table below.
Oxygen (O)
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for the electronic configuration given, choose the electronic configura…
$1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^{2}4d^{10}5p^{6}6s^{1}$
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which group of the periodic table is the following element found in? ar…
Group 4
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read the lines from the tide rises, the tide falls. along the sea - san…
It strengthens the connection between the two lines.
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highlight the nonmetals in the periodic table below.
H, He, B, C, N, O, F, Ne, Si, P, S, Cl, Ar, Ge, As, Se, Br, Kr, Sb, Te, I, Xe, Po, At, Rn
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question 7 the following molecule has how many degrees of unsaturation?…
C. 4
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4. how many particles are in 1.20 mol of sodium sulfide? 5. how many pa…
4. $7.23\times 10^{23}$ particles 5. $7.53\times 10^{23}$ particles 6. $1.07\times 10^{22}$ atoms 7. $1.26\times 10^{23}$ formula - units 8. $3.35\times 10^{25}$ molecules 9. $1.5…
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4. why is the salt solution heated in step 6? 5. how might the final tr…
4. To evaporate the solvent (water) and obtain salt crystals. 5. Use a desiccant or heat in an oven at a controlled temperature for a longer time. 6. Incomplete filtration of salt…
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which of the following is an example of a physical change? a. digesting…
D. Cutting your hair
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what is the molar mass of h₂co₃? a. 62 g/mol b. 30 g/mol c. 61 g/mol d.…
A. 62 g/mol
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which element is magnetic? calcium copper carbon cobalt
D. cobalt
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why are fossil fuels considered nonrenewable resources? a. because they…
B. Because they take millions of years to recreate
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the chemical reaction that occurs when gasoline and air are ignited is …
D. combustion reaction
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engineers often attempt to capture and reuse energy or to use renewable…
B. green design
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what happens when a molecule combusts? a. it combines with oxygen. b. i…
A. It combines with oxygen.
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question 9 of 10 which of the following is the correct model of c₈h₁₈? …
C.
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what reactants form a combustion reaction? a. a hydrocarbon and water b…
B. A hydrocarbon and oxygen
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question 1 of 10 which method of drawing hydrocarbons is the fastest to…
C. The stick model method
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what is a hydrocarbon? a. a molecule containing only carbon and oxygen …
B. A molecule containing only carbon and hydrogen
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4.3.4 quiz: balancing organic reactions question 4 of 10 what products …
C. Carbon dioxide and water
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what coefficient would the o₂ have after balancing c₄h₁₀ + o₂ → co₂ + h…
A. 6.5
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which of the following is a combustion reaction? a. naoh + hcl → nacl +…
C. $C_3H_8 + 5O_2 ightarrow3CO_2 + 4H_2O$
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what atom should be balanced last when balancing hydrocarbon combustion…
D. The oxygen atoms
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what is the oxidation number of bromine as a reactant and in the produc…
The oxidation number of $Br$ in $Br_2$ is 0 and in $Al_2Br_6$ is - 1.
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the reaction between aluminum and bromine is an oxidation - reduction r…
Al as a reactant: 0; Al in $Al_2Br_6$: + 3
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if a reaction starts with 4 cu atoms, 5 o atoms, and 10 h atoms, what i…
B. The products will contain 4 Cu atoms, 5 O atoms, and 10 H atoms.
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how many o atoms are in zn(clo₃)₂? a. 2 b. 3 c. 1 d. 6
D. 6
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question 8 of 10 what is the net ionic equation of 2h⁺ + so₄²⁻ + ca²⁺ +…
A. $SO_4^{2-}+Ca^{2+}\to CaSO_4$
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what is the complete ionic equation for naoh(aq) + hcl(aq) → h₂o(l) + n…
A. Na⁺ + OH⁻ + H⁺ + Cl⁻ → H₂O + Na⁺ + Cl⁻
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what are the spectator ions in na⁺ + oh⁻ + h⁺ + cl⁻ → h₂o + na⁺ + cl⁻? …
B. $\text{Na}^+$ and $\text{Cl}^-$
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question 5 of 10 what does a complete ionic equation look like? a. all …
A. All ionic substances are written as separate ions in solution.
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what is a net ionic equation? a. an equation that is balanced on both s…
C. An equation showing only what is involved in the reaction
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question 3 of 10 which of the following best describes a balanced react…
C. A reaction that has the same number and type of atoms on each side of the equation
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question 2 of 10 what is needed to balance the reaction cl₂ + ki → kcl …
D. 2KI and 2KCl
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what is an inorganic chemical? a. a chemical that makes up living thing…
B. A chemical that is not from living things
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write a net ionic equation for the reaction that occurs when solid magn…
$MgCO_3(s)+2H^+(aq) ightarrow Mg^{2 +}(aq)+H_2O(l)+CO_2(g)$
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write a net ionic equation for the overall reaction that occurs when aq…
$H^+(aq)+OH^-(aq) ightarrow H_2O(l)$
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write the net ionic equation for the precipitation reaction that occurs…
$Pb^{2+}(aq)+2Br^{-}(aq) ightarrow PbBr_2(s)$
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characterize hf as a strong, weak, or nonelectrolyte. o strong electrol…
1. HF: weak electrolyte 2. HBr: strong electrolyte 3. CH₃CH₂OH: nonelectrolyte
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question 4 what is true concerning physical and logical topologies? the…
Logical topologies refer to how a network transfers data between devices.
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multiple choice 2 points which of the following statements correctly pe…
B. They rotate the plane of polarized light by exactly the same amount and in opposite directions.
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29 multiple choice 2 points which of the following are acceptable fisch…
A. II only
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multiple choice 2 points identify if the given pair of molecules are co…
B. Stereoisomers
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multiple choice 2 points which of the following conditions can lead to …
B. The compound is symmetric.
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25 multiple choice 2 points which of the following best defines chirali…
The property of a molecule being non - superimposable on its mirror image.
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how many diastereomers are there of the molecule shown below? previous
3
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multiple choice 2 points identify each of the given pairs as either con…
A. (a) Identical compounds (b) Enantiomers
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multiple choice 2 points what is a chiral center in organic chemistry? …
C. A carbon atom bound to four different groups.
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20 multiple choice 2 points (s)-2 - chloropentane has a specific rotati…
(i) [Appropriate 3 - D structure of (S)-2 - chloropentane as shown in the correct option] (ii) - 34.07° (iii) %R = 31.70%; %S = 68.30%
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19 multiple choice 2 points explain the relation between absolute confi…
The fourth option: There isn't any relation of R and S with (+) and (-). If the R isomer of any compound is dextrorotatory (+) then the S isomer could be either dextrorotatory or …
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sat oct 4 quiz multiple choice 2 points consider the molecule shown her…
No options are provided in the question to choose from. However, if we analyze the statements: i. If the mirror - image of a molecule is superimposable, the molecule is achiral. i…
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what is a cation? a a molecule that contains two or more elements. b a …
C. A positively charged ion.
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17 multiple choice 2 points for each of the following compounds, draw a…
B. a. Optically active; b. Optically inactive
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16 multiple choice 2 points if (s)-glyceraldehyde has a specific rotati…
B. +8.7°
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15 multiple choice 2 points what term describes the structural relation…
A. constitutional isomers
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transform the structural formulas below into fischer projection formula…
The correct Fischer - projection formulas are the ones in the first set of options (top - most set of Fischer - projection attempts): A. For the first structure: - Vertical bonds …
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multiple choice 2 points what term describes the structural relationshi…
A. constitutional isomers
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use the following three structures to answer th question below. the rel…
C. constitutional isomers
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predict the specific rotation of the compound shown. zero; the compound…
A. Zero; the compound is achiral.
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10 multiple choice 2 points the boiling point of s - 2 - butanol is 99°…
B. 99°C
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multiple choice 2 points a substance has a specific rotation of -40.00°…
B. % of the (+)-enantiomer = 26.8%, % of the (-)-enantiomer = 73.2%
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multiple choice 2 points which of the following terms best describes th…
D. enantiomers
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multiple choice 2 points use the following three structures to answer t…
same compound
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multiple choice 2 points which of the statements below correctly descri…
The molecule might be a meso form.
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multiple choice 2 points draw structures consistent with the names give…
a. A b. B c. Information about option C is incomplete in the provided image, so cannot be determined from the given content.
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multiple choice 2 points which of the following is a characteristic of …
C. They have two or more chiral centers but are overall achiral.
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multiple choice 2 points how many asymmetric carbon atoms are present i…
B. 2
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multiple choice 2 points which of the following terms best describes th…
A. constitutional isomers
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1 multiple answer 2 points the 50/50 mixture of the two compounds below…
C. chiral
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question 3 of 3 in a redox reaction, the oxidizing agent is gaining ele…
True
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a chemist has 500 ml of a 30% acid solution. she adds x milliliters of …
The horizontal asymptote $y = 10$ means that the final concentration will always be greater than 10%.
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multiple select question select all that apply select all of the follow…
A. Acetylcholine C. Norepinephrine
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lesson 5 food. in what way(s) did teddy roosevelt improve public health…
1. D. All of the above 2. D. World War I shifted national focus away from domestic reforms.
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question 16 (multiple choice worth 3 points) (01.08r mc) which of the f…
The nation's government promotes terrorist activities.
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current attempt in progress which one of the following orbitals is the …
E. 4d
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which one of the following orbitals has the greatest number of nodes? 4…
C. $5p$
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current attempt in progress which one of the following terms describes …
The azimuthal quantum number
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a sample of 2.416 grams of a compound containing carbon and hydrogen re…
(a) C = 1.927 g; H = 0.486 g (b) No (c) C = 79.76%; H = 20.11% (d) CH₃