Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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balance the reaction, do not leave any fractions, dont leave anything b…
1. \(2\) (B) 2. \(4\) (D) 3. \(3\) (C) 4. \(U\) (decomposition) 5. \(Z\) (yes) 6. \(DD\) (oxidized) 7. \(AA\) (no)
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balance the reaction, do not leave any fractions, dont leave anything b…
1. \(2\) 2. \(27\) 3. \(18\) 4. \(18\) 5. \(Y\) 6. \(Z\) 7. \(DD\) 8. \(Z\) 9. \(CC\)
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balance the reaction, do not leave any fractions, dont leave anything b…
1. A 2. A 3. B 4. A 5. V 6. Z 7. DD 8. Z
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balance the reaction, do not leave any fractions, dont leave anything b…
1. \(3\) 2. \(2\) 3. \(1\) 4. \(6\) 5. \(X\) (neutralization) 6. \(W\) (double displacement) 7. \(AA\) (no) 8. \(Z\) (yes) 9. \(CC\) (stable)
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question 5 (1 point) balance the reaction, do not leave any fractions, …
1. \(A\) (coefficient of \(Hg_3(PO_3)_2\) is \(1\)) 2. \(C\) (coefficient of \(Zn\) is \(3\)) 3. \(C\) (coefficient of \(Hg\) is \(3\)) 4. \(A\) (coefficient of \(Zn_3(PO_3)_2\) i…
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question 4 (1 point) balance the reaction, do not leave any fractions, …
1. \(3\) (C) 2. \(2\) (B) 3. \(6\) (no option provided in the given letters, but if we assume the closest is not there. However, based on balancing) 4. \(1\) (A) 5. W (double disp…
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balance the reaction, do not leave any fractions, dont leave anything b…
1. \(2\) 2. \(21\) 3. \(14\) 4. \(14\) 5. \(Y\) (combustion) 6. \(Z\) (yes) 7. \(DD\) (oxidized) 8. \(Z\) (yes) 9. \(CC\) (stable)
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balance the reaction, do not leave any fractions, dont leave anything b…
1. \(6\) 2. \(2\) 3. \(3\) 4. \(2\) 5. \(V\) (single displacement) 6. \(Y\) (yes) 7. \(DD\) (reduced) 8. \(Y\) (yes)
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balance the reaction, do not leave any fractions, dont leave anything b…
1. B. 2 2. D. 4 3. C. 3 4. U. decomposition 5. Y. yes 6. CC. oxidized 7. Z. no
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text 1 chemically analyzing bulk rock - core samples from australias mo…
A. Is the increase in Mo in that portion attributable to oxidative weathering of the material found in that portion?
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question 20 (5 points) so₃ is a covalent compound with no lone pairs on…
C. Trigonal planar, non - polar
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a chemical reaction has the equation 2agno₃ (aq) + zn (s) → 2ag (s) + z…
- First question: D. Single displacement - Second question: B. predict molecular structure.
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suppose a phosphorous atom forms a bond with a fluorine atom. what type…
First question: C) Polar covalent bond Second question: B) They maximize the space between valence electrons to minimize the repulsion between them.
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covalent bonding occurs between two oxygen atoms to form o₂. whats the …
- First question: D. Both oxygen atoms have zero partial charge. - Second question: (Since the options provided for the second question are incomplete in the user - given text, bu…
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iron oxide reacts with carbon monoxide to produce iron and carbon dioxi…
B. For every mole of iron oxide consumed, two moles of iron are produced. A. Metallic
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question 11 (5 points) listen in this molecule, whats the formal charge…
C. 0
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which type of bonding involves sharing valence electrons, but the valen…
First question: D. Metallic bonding Second question: (Assuming the correct reaction occurs based on halogen activity, but if we follow the option structure, there is an error. How…
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the compound f₂o has two lone pairs on the central oxygen atom. whats t…
A. Bent or angular, polar; A. Neither compound will form as a solid.
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two reactants combine to form a product in the reaction a + b → c. the …
A. 4
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two atoms bonded together will remain some distance apart, minimizing t…
First question: B. potential energy of the bond. Second question: B. 2HCl (aq) + Zn (s) → ZnCl₂ (aq) + H₂ (g)
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can nif₂ react with k to produce kf and ni? why or why not? a) yes, bec…
1. C. Yes, because K has higher activity than Ni 2. A. (aq)
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which transition metals are paramagnetic but can easily form ferromagne…
1. A. Transition metals in groups 8 - 10, periods 4 and 5 2. A. N - type
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a certain polyatomic ion contains 49 protons and 50 electrons. whats th…
C. -1
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the atomic number of manganese (mn) is 25. whats the electron configura…
For the electron - configuration question: C. \([Ar]3d^{5}4s^{2}\) For the metal - element statement question: C. Metals tend to easily lose their valence electrons.
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a certain covalent compound is named sulfur hexafluoride. whats the che…
For the first question: B. \(SF_{6}\) For the second question: C. \([Ne]\)
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which group in the periodic table contains the three elements with the …
1. C. Group 11 2. (Since the options provided in the second question do not include the correct "p - type", but if we assume there is an error in the options and based on the dopi…
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which types of halogen compounds are known to contribute to ozone deple…
- First question: D. Chlorofluorocarbons - Second question: None of the options are correct. The correct answer is 3 bromite ions (\(BrO_2^{-}\)) and the formula \(Sc(BrO_2)_3\)
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which of the following statements about non - metals is correct? a) non…
- For the non - metals question: C. Non - metals tend to have high ionization energy and high electronegativity. - For the \(Ca^{+2}\) electron - configuration question: C. \([Ar]…
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in a certain chemical process, water reacts with a compound, and the wa…
For the first question: D. Hydrolysis For the second question: (Assuming correct ratio based on charge balance \(Fe^{2+}+2Cl^-\), but since no correct option as per standard (if o…
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which block in the periodic table contains the metalloids? a) d block b…
D. \(p\) block A. Desalination
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which group or groups of atoms are the only atoms with forbitals?a) all…
1. D. Lanthanides and actinides 2. B. Lithium chlorite
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which act regulates the chemicals used in mining and elsewhere? toxic s…
Toxic Substance Control Act
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what is the main reason for changing the use of pesticides over time? t…
environmental and health concerns
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\in our bodies, sugar is broken down with oxygen to produce water and c…
Theoretical yield: \(9.64\) grams (rounded to two decimal places) Percent yield: \(76.9\%\)
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for the following reaction, 5.19 grams of iron(ii) chloride are mixed w…
Theoretical yield: \(7.37\) grams Percent yield: \(81.4\%\)
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for the following reaction, 4.11 grams of zinc oxide are mixed with exc…
The theoretical yield of zinc hydroxide is \(5.02\) grams. The percent yield for this reaction is \(94.2\%\)
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for the following reaction, 30.3 grams of zinc oxide are allowed to rea…
Mass of \(Zn(OH)_{2}=31.4\ g\) Formula for limiting reactant: \(H_{2}O\) Mass of excess reagent (\(ZnO\)) remaining \( = 4.56\ g\)
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use the references to access important values if needed for this questi…
Mass of \(NaOH = 14.2\ g\) Formula for the limiting reactant: \(Na\) Mass of excess reactant (\(H_{2}O\)) remaining \(=3.01\ g\)
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use the references to access importa enter electr use smallest possible…
The oxidation half - reaction is \(Ni(s)\to Ni^{2+}(aq)+2e^{-}\) The reduction half - reaction is \(F_{2}(g)+2e^{-}\to 2F^{-}(aq)\)
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use the references to access important values if needed for this questi…
\(14.6\space g\)
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when the following equation is balanced properly under basic conditions…
The coefficient of \(H_{2}O\) is 2 and the number of electrons transferred is 2.
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when the following molecular equation is balanced using the smallest po…
2, 1, 1, 2
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when the following molecular equation is balanced using the smallest po…
1, 3, 2
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identify the species oxidized, the species reduced, the oxidizing agent…
Species oxidized: \(Cu\); Species reduced: \(F_{2}\); Oxidizing agent: \(F_{2}\); Reducing agent: \(Cu\); Electrons transferred from: \(Cu\); Electrons transferred to: \(F_{2}\)
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use the references to access important values if needed for this questi…
\(6\)
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an aqueous solution of nitric acid is standardized by titration with a …
$0.288\space M$
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use the references to access important values if needed for this questi…
\(0.126\space M\)
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what volume of a 0.234 m hydrochloric acid solution is required to neut…
$5.11\ mL$
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what volume of a 0.107 m nitric acid solution is required to neutralize…
\(28.3\space mL\)
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a student determines the silver content of a solution by first precipit…
\(3.78\space g\)
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a 0.4130 g sample of a pure soluble bromide compound is dissolved in wa…
\(53.8\%\)
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how many ml of 0.499 m hbr are needed to dissolve 9.38 g of caco₃? 2hbr…
\(376\space mL\)
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in the laboratory you are given the task of separating ca²+ and cu²+ io…
1. N 2. Y, \(CaSO_4\) 3. N
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in the laboratory you are given the task of separating pb2+ and zn2+ io…
1. Y, \(PbCl_{2}\) 2. N 3. Y, \(PbSO_{4}\)
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use the references to access important values if needed for this questi…
Yes, the net ionic equation is \(3Co^{2 +}(aq)+2PO_4^{3 -}(aq)=Co_3(PO_4)_2(s)\)
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use the references to access important values if needed for this questi…
No
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to reduce dangerous swelling in the brain, physicians sometimes adminis…
\(4.9\space g\)
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suppose 0.65 l of acetone and 0.23 l of toluene are mixed, and the fina…
\(72\%\)
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reflect when you combine two or more substances called reactants, the a…
- For the rotting pumpkin: A new substance is formed (decomposition products), and there may be color change and smell (related to new chemical substances). - For the burning camp…
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reflect when you combine two or more substances called reactants, the a…
For the smelly, rotting pumpkin: A new substance (with new properties like smell) is formed. For the burning campfire: Production of light (and heat). For the tarnished silverware…
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a chemist mixes 70. g of carbon tetrachloride with 33. g of isopropenyl…
| component | mass percent | |--|--| | carbon tetrachloride | \(44.0\%\) | | isopropenylbenzene | \(20.8\%\) | | thiophene | \(35.2\%\) |
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a chemist must dilute 0.0752 l of 25.3 m aqueous silver perchlorate (ag…
\(0.119\space L\)
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question 9 1 pts aspirin, also known as acetylsalicylic acid (c₉h₈o₄), …
\(7.53\)
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what is the elemental composition of acetic acid, hc₂h₃o₂? report the m…
6.714 40.00 53.29
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question 7 1 pts you wish to prepare 0.037 m kclo3 from a stock solutio…
0.26
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question 5 1 pts how many grams of calcium hydroxide would you need to …
4.26
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what products are formed when sodium reacts with gaseous chlorine? sele…
NaCl
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what products are formed when sodium reacts with gaseous chlorine? sele…
6.81
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balance the following equation (use the number 1 when needed - dont lea…
\(3\), \(2\), \(1\), \(6\)
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what does it mean when a compound (or element or alloy) appear above th…
The compound is a catalyst.
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question 2 2 pts what mass of sodium hydroxide will completely react wi…
144.5 g (the third option)
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based on the following chemical equation: 2 c₆h₆ + 15 o₂ --> 12 co₂ + 6…
17.8 mol
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question 1 (5 points) saved entropy and enthalpy are the same concept. …
1. B. False 2. B. False 3. B. False
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question 1 (5 points) chemical equilibrium means an equal amount of rea…
- Question 1: B. False - Question 2: B. False - Question 3: B. False
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11. for the poem below, complete the following: a. number each line on …
- a. Lines are numbered 1 - 14 as in the given poem. - b. Quatrain 1 (Lines 1 - 4), Quatrain 2 (Lines 5 - 8), Quatrain 3 (Lines 9 - 12), Couplet (Lines 13 - 14). - c. Rhythm marks…
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a/an _______ is the smallest unit of matter that has the characteristic…
For the first question: B. atom For the second question: C. \(2.8\times 10^{6}\space mg\)
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a group in the periodic table has the same a) shell number. b) number o…
- First question: C. number of outer shell electrons. - Second question: C. have the same principal quantum number.
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molecules have a) both potential and kinetic energy. b) only kinetic en…
- First question: A. both potential and kinetic energy. - Second question: B. The air around you.
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which of the following is characteristic of non - metals? a) they tend …
D. They tend to gain electrons in chemical reactions; B. photon
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which of the following is best described by the term macroscopic? a) wa…
A. Water in the liquid phase boils to become a gas.
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you would expect magnesium to be most similar in properties to a) sulfu…
For the first question: B. calcium For the second question: B. a three - dimensional space that shows the probability where an electron is most likely to be found.
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the s orbital can hold a) 12 electrons. b) eight electrons. c) two elec…
- First question: C. two electrons. - Second question: C. \(H_2O_2\).
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a scanning tunneling microscope allows imaging of ________ particles. a…
A. 302 g.
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a scanning tunneling microscope allows imaging of ______ particles. a) …
B) \(301.8\) g
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which of the following is a homonuclear diatomic molecule? a) 2co₂ b) n…
For the first question: D. \(H_2\) For the second question: A. in chemical changes and physical changes.
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term 4) electronegativity left to right across a period your answer typ…
Electronegativity increases from left to right across a period.
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term 4) elements with similar properties have the same number of choose…
1. Valence electrons
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select the correct name for the compound, including the correct (e) or …
(E)-3,7-dimethyl-3-octene
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which subatomic particle is the smallest? protons neutrons electrons re…
electrons
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if an atom has 8 protons and 6 electrons...is it still oxygen? no yes r…
Yes
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what do these two changes have in common? melting wax ice crystals form…
Both are changes of state.
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what do these two changes have in common? a log decomposing in the wood…
Both conserve mass.
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b.3 calculate the number of moles of magnesium that will react in each …
- \(a\): \(0.0123\) - \(b\): \(0.0247\) - \(c\): \(0.025\)
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this is a brass trumpet. brass is a shiny metal. to make brass, copper …
homogeneous mixture
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b.3 calculate the number of moles of magnesium that will react in each …
a. \(0.0123\) mol b. \(0.0247\) mol c. \(0.025\) mol
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this is a dish containing calcium chloride. calcium chloride is a white…
compound
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this is a piece of gallium. gallium is a soft, silvery metal. when heat…
element
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8.2 calculate the number of moles of magnesium ribbon added to each fla…
a. \(0.0123\space mol\) b. \(0.0247\space mol\) c. \(0.0494\space mol\)
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this is a bowl of coleslaw. coleslaw is made by shredding and combining…
heterogeneous mixture
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this is a sample of glucose powder. glucose is a simple sugar that is c…
compound