Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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question 50 (1 point) of the following elements, which one has the smal…
a. aluminum
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question 47 (1 point) which of the following statements correctly compa…
- Question 47: d. The radius of an anion is greater than the radius of its neutral atom. - Question 48: d. an increase in the number of protons - Question 49: b. ionization energy…
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question 24 (1 point) how does atomic radius change from left to right …
- Question 24: C. It tends to decrease. - Question 25: A. Electrons are added to the same principal energy level. - Question 26: A. decreases as you move from left to right across…
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question 21 (1 point) what are the group 1a and group 7a elements examp…
- Question 21: C. representative elements - Question 22: B. Te - Question 23: D. It tends to increase.
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consider the table of average bond enthalpies. what is the \\( \\delta …
\(-808\)
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question 51 (2 points) how many electrons are there in the highest occu…
5
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question 18 (1 point) which of the following elements is a transition m…
a. copper # Question 19
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question 51 (2 points) how many electrons are there in the highest occu…
Question 51: \(5\) Question 52: \(8\) Question 53: \(36\) Question 54: \(18\)
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question 50 (1 point) of the following elements, which one has the smal…
B. aluminum
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question 15 (1 point) elements that are characterized by the filling of…
- Question 15: B. groups 3A through 8A - Question 16: D. a filled highest occupied principal energy level - Question 17: B. electron
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question 47 (1 point) which of the following statements correctly compa…
- **Question 47**: C. The radius of an anion is greater than the radius of its neutral atom. - **Question 48**: C. an increase in the number of protons - **Question 49**: C. ioniz…
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question 12 (1 point) the atomic number of an element is the total numb…
- Question 12: C. protons - Question 13: B. silicon - Question 14: C. The highest occupied \(s\) and \(p\) sublevels are completely filled.
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question 44 (1 point) which statement is true about electronegativity? …
- Question 44: A. Electronegativity generally increases from left to right across a period. - Question 45: C. higher - Question 46: A. ionization energy
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of the elements pt, v, li, and kr, which is a nonmetal? o a pt o b v o …
- Question 9: c. Kr - Question 10: b. nonmetals - Question 11: b. In, 49 protons, 49 electrons
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question 41 (1 point) which of the following factors contributes to the…
- **Question 41**: B. increase in atomic size - **Question 42**: B. potassium - **Question 43**: D. lithium
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question 6 (1 point) the modern periodic table is arranged in order of …
- **Question 6**: B. number - **Question 7**: D. Dmitri Mendeleev - **Question 8**: D. metals
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question 38 (1 point) which of the following elements has the smallest …
b. Li # Question 39
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question 5 (1 point) each period in the periodic table corresponds to a…
A. principal energy level
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question 4 (1 point) which of the following elements is in the same per…
B. magnesium
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question 35 (1 point) in which of the following groups of ions are the …
d. \(Ca^{2+},Al^{3+},Br^{-}\) ### Question 36
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question 3 (1 point) what is another name for the transition metals? o …
C. Group B elements
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question 2 (1 point) what is another name for the representative elemen…
d. Group A elements
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question 32 (1 point) the metals in groups 1a, 2a, and 3a o a lose elec…
A. lose electrons when they form ions ### Question 33
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question 29 (1 point) which of the following elements has the smallest …
d. chlorine # Question 30
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question 26 (1 point) atomic size generally a increases as you move fro…
- **Question 26**: C. decreases as you move from left to right across a period. - **Question 27**: C. lithium. - **Question 28**: B. more shielding of the electrons in the highest…
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question 1 (10 points) match each item with the correct statement below…
1. i. period 2. b. group 3. c. periodic law 4. a. metal 5. g. transition metal 6. e. atomic radius 7. d. atomic mass 8. j. electrons 9. h. electronegativity 10. f. ionization ener…
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drag each tile to the correct box. arrange the steps in order to descri…
1. The liquid gains thermal energy. 2. The particles of liquid move faster. 3. The space between the liquid particles increases. 4. The liquid changes to a gas.
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question 23 (1 point) how does atomic radius change from top to bottom …
- Question 23: B. It tends to increase. - Question 24: C. It tends to decrease. - Question 25: B. Electrons are added to the same principal energy level.
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which pes graph best represents the element oxygen (o)?
D
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which of the following groupings contains only representative elements?…
- Question 1: B. Al, Mg, Li - Question 2: A. The highest occupied s and p sublevels are partially filled - Question 3: B. representative elements - Question 4: C. Te
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question 16 (1 point) which of the following electron configurations is…
- Question 16: A. a filled highest occupied principal energy level - Question 17: B. electron - Question 18: D. copper
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question 13 (2 points) what element has the electron configuration 1s²2…
d. silicon ### Question 14
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question 10 (1 point) to what category of elements does an element belo…
C. nonmetals ### Question 11
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question 7 (1 point) who arranged the elements according to atomic mass…
- Question 7: C. Dmitri Mendeleev - Question 8: A. metals - Question 9: A. Kr
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question 4 (1 point) which of the following elements is in the same per…
C. magnesium # Question 5
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column a 6. e one - half the distance between the nuclei of two atoms w…
Question 2: B. Group A elements Question 3: C. Group B elements
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question 1 (10 points) match each item with the correct statement below…
1. b. period 2. d. group 3. c. periodic law 4. j. metal 5. f. transition metal 6. e. atomic radius 7. g. atomic mass 8. a. electrons 9. i. electronegativity 10. h. ionization ener…
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practice it which substances are actively transported from the blood in…
Hydrogen ions, potassium ions, and certain drugs.
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consider the reaction of a 20.0 ml of 0.220 m c₅h₅nhcl (ka = 5.9 x 10⁻⁶…
\(C_5H_5NH^+(aq)+OH^-(aq) ightleftharpoons C_5H_5N(aq) + H_2O(l)\)
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consider the reaction of a 20.0 ml of 0.220 m c₅h₅nhcl (ka = 5.9 x 10⁻⁶…
\(C_5H_5NH^{+}(aq)+OH^{-}(aq) ightleftharpoons C_5H_5N(aq) + H_2O(l)\)
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consider the reaction of 75.0 ml of 0.350 m c₅h₅n (kb = 1.7×10⁻⁹) with …
First, calculate the concentration of \(H^+\): \[ \begin{align*} [H^+]&=\frac{0.0162\space mol}{0.1750\space L}\\ &= 0.0926\space M \end{align*} \] Then, calculate the \(pH\): \[ …
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consider the reaction of 75.0 ml of 0.350 m c₅h₅n (kb = 1.7 x 10⁻⁹) wit…
\(175.0\space mL\)
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consider the reaction of 75.0 ml of 0.350 m c₅h₅n (kb = 1.7 x 10⁻⁹) wit…
\(175.0\space mL\)
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consider the reaction of 75.0 ml of 0.350 m c₅h₅n (kb = 1.7 x 10⁻⁹) wit…
\(0.0162\) moles
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consider the reaction of 75.0 ml of 0.350 m c₅h₅n (kb = 1.7 x 10⁻⁹) wit…
B. \(C_5H_5NH^+\) and \(H^+\)
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consider the reaction of 75.0 ml of 0.350 m c₅h₅n (kb = 1.7 x 10⁻⁹) wit…
\(0.0425\space mol\)
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consider the reaction of 75.0 ml of 0.350 m c₅h₅n (kb = 1.7 x 10⁻⁹) wit…
\(0.02625\space mol\)
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question 1.a of 7 consider the reaction of 75.0 ml of 0.350 m c₅h₅n (kb…
\(C_5H_5N(aq)+H^{+}(aq) ightarrow C_5H_5NH^{+}(aq)\)
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fill in the blank 4 points write the correct term by the picture: word …
A. element B. element C. compound D. mixture
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missed this? watch kcv. heat capacity, iwe: relating heat energy to tem…
\(655\space J\)
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4) 2 mn + 6hi → 3h₂ + 2 mni₃ is this equation balanced? ______________ …
4) Yes. 5) Yes. 6) No.
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1. determine whether or not each equation is balanced or not. 2. using …
1) Not balanced 2) Not balanced 3) Balanced
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you have two samples: . sample a: trail mix (nuts, raisins, and chocola…
- **Claim**: - Homogeneous mixture: Sample B. - Heterogeneous mixture: Sample A. - **Evidence**: - Sample A: Visible distinct components (nuts, raisins, chocolate chips); can be s…
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worksheet count the atoms present in the different compounds by using t…
For \(Ba_3(PO_4)_2\): - Type of Atom: Barium (\(Ba\)), Phosphorus (\(P\)), Oxygen (\(O\)) - \(\#\) of Atoms: \(3\), \(2\), \(8\), Total \(13\) For \(Na_2CrO_4\): - Type of Atom: S…
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what does organic agriculture avoid using? synthetic pesticides and fer…
synthetic pesticides and fertilizers
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before calling a technician this time, only to learn the culprit was a …
B. They involved interruptions to the flow of gravity - driven water.
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now we need to once again think about $delta h$. this is a review, and …
- If a process requires energy, it is endothermic and the sign of $\Delta H$ is positive. - If a process releases energy, it is exothermic and the sign of $\Delta H$ is negative.
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read the passage. the stinky durian fruit the durian is an asian fruit …
Scientists found that a combination of different chemicals is responsible for the durian's powerful odor.
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5) the following steps are part of the treatment process for municipal …
b, d, e, c, f, a
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how many resonance structures can be drawn for no₃⁻? ____
\(3\)
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identify the correct structure of capric acid (c₁₀h₂₀o₂). select the co…
none of the above
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question 9 · 1 point identify the carboxylic acid group and hydrocarbon…
In the given structure of fatty acids, there is one \( COOH \) group and \( 22 \) carbons present.
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what are the structural components of glycerophospholipids that differe…
the presence of a phosphate group, the modification by an amino alcohol
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identify the structure for phosphatidylglycerol. select the correct ans…
The second - option structure.
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11. the element with the electron configuration, (1s^{2}2s^{2}2p^{6}3s^…
d. iodine
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elements in the same group have the same... a. valence shell c. energy …
B. number of valence electrons
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9. which principal energy level of the period 4 transition metals is be…
C. third
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identify structural difference(s) between cholesterol and testosterone.…
- Cholesterol and testosterone have different groups connected to C−3 of the A - ring. - Cholesterol and testosterone have different groups connected to C−17 of the D - ring. - Th…
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question 51 (2 points) how many electrons are there in the highest occu…
- Question 51: \(5\) - Question 52: \(8\) - Question 53: \(36\) - Question 54: \(18\)
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identify structural difference(s) between cholesterol and testosterone.…
- Cholesterol and testosterone have different groups connected to C−3 of the A - ring. - Cholesterol and testosterone have different groups connected to C−17 of the D - ring.
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question 48 (1 point) which of the following factors contributes to the…
- Question 48: d. an increase in the number of protons - Question 49: b. ionization energy increases - Question 50: a. aluminum
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use the references to access important values if needed for this questi…
For \(K_{a1}\): \(H_2C_6H_6O_6+H_2O ightleftharpoons H_3O^++HC_6H_6O_6^-\) For \(K_{a2}\): \(HC_6H_6O_6^-+H_2O ightleftharpoons H_3O^++C_6H_6O_6^{2 -}\)
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question 45 (1 point) compared with the electronegativities of the elem…
B. higher ### Question 46
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explain what happens during partial hydrogenation of fats and oils that…
Partial hydrogenation is meant to convert some of the fatty acid double bonds (which are cis in naturally occuring fatty acids) to single bonds, but also converts some of the cis …
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question 42 (1 point) which of the following elements has the smallest …
d. potassium # Question 43
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question 39 (1 point) what is the energy required to remove an electron…
A. ionization energy # Question 40
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question 36 (1 point) what is the element with the lowest electronegati…
Question 36: a. cesium Question 37: a. fluorine Question 38: a. O
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which of the following statements is true about ions? o a anions are po…
c # Question 34
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question 33 (1 point) which of the following statements is true about i…
c. When an anion forms, more electrons are transferred to it. ### Question 34
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question 30 (1 point) what is the charge of a cation? o a a negative ch…
- **Question 30**: c. a positive charge - **Question 31**: d. Cations form when an atom loses electrons - **Question 32**: a. lose electrons when they form ions
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question 28 (1 point) which of the following factors contributes to the…
- Question 28: d. more shielding of the electrons in the highest occupied energy level - Question 29: c. chlorine - Question 30: c. a positive charge
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although both the female sex hormones estradiol and progesterone have t…
A. A hydroxyl group in estradiol is replaced by a double bond to oxygen in progesterone. B. Progesterone has an extra methyl group.
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how do phytosterols differ from cholesterol? select the correct answer …
The hydrocarbon chain on C - 17 of the ring structure is different.
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question 24 (1 point) how does atomic radius change from left to right …
- Question 24: d. It tends to decrease. - Question 25: c. Electrons are added to the same principal energy level. - Question 26: c. decreases as you move from left to right across…
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question which of the following is a characteristic of ldl, a cholester…
- B. It is a low - density lipoprotein involved in transporting cholesterol from the liver to the tissues. - D. It is spherical in shape, with an inner core of nonpolar lipids and…
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the ph of an aqueous solution of 0.413 m ethylamine (a weak base with t…
\(12.18\)
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identify the amino alcohol group in the structure below. select the cor…
ethanolamine
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use the references to access important values if needed for this questi…
\(6.82\times 10^{-13}\)
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identify the structure of the link that connects two fatty acid chains …
The second option (\( -C(=O)-O - \)) is the correct structure of the link (ester bond) that connects two fatty acid chains to glycerol in glycerophospholipids.
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use the references to access important values if needed for this questi…
\(4.61\times 10^{-4}\)
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the value of ( k_{a1} ) and ( k_{a2} ) for ascorbic acid ( (h_2c_6h_6o_…
For \(K_{a1}\): \(H_2C_6H_6O_6 + H_2O ightleftharpoons HC_6H_6O_6^-+H_3O^+\) For \(K_{a2}\): \(HC_6H_6O_6^- + H_2O ightleftharpoons C_6H_6O_6^{2 -}+H_3O^+\)
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use the references to access important values if needed for thi the ph …
\(3.92\)
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select the correct answer below: triacylglycerol glycerol lauric acid p…
glycerol
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calculate the concentration of $hc_{6}h_{6}o_{6}^{-}$ in an aqueous sol…
\(2.34\times 10^{-3}\)
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which catalyst is used in the laboratory to hydrolyze a triglyceride to…
strong acid
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unsaturated fats can be converted to saturated fats by which of the fol…
hydrogenation
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what are the reactants and product in the esterification reaction shown…
Palmitic acid, oleic acid, and linoleic acid are reactants, and a triglyceride is the product.
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what is the role of nickel in the hydrogenation of unsaturated triglyce…
Nickel is a catalyst.
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calculate the concentration of $s^{2-}$ in an aqueous solution of 0.107…
\(7.1\times 10^{-15}\)
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identify the polyunsaturated fatty acid. select the correct answer belo…
The third option.