化学
化学反応、化学量論、分子構造、元素の性質。
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read the sentence. organic farming often uses blank natural pesticides …
more applications of, help
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read the sentence. organic farming often uses _blank_ natural pesticide…
more applications of, help
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e cu (s) + agno₃ (aq) molecular total ionic net ionic f zn (s) + hcl (a…
| Reaction | Molecular | Total Ionic | Net Ionic | |--|--|--|--| | \(Cu(s)+AgNO_3(aq)\) | \(Cu(s)+2AgNO_3(aq) ightarrow Cu(NO_3)_2(aq) + 2Ag(s)\) | \(Cu(s)+2Ag^{+}(aq)+2NO_3^{-}(a…
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questions: 1. what is dehydration synthesis? 2. what is hydrolysis? pol…
1. Dehydration synthesis is a chemical reaction where two molecules combine to form a larger one with the loss of a water molecule. 2. Hydrolysis is a reaction where a water molec…
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a shiny, gold - colored bar of metal weighing 90.7 g has a volume of 4.…
yes, the density is 19.3.
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exit ticket — chemical combining of substances name: madison crance per…
1. (Circle one based on observation) 2. True 3. $2H_2 + O_2 ightarrow 2H_2O$ 4. Rusting of iron ($4Fe + 3O_2 ightarrow 2Fe_2O_3$) 5. A chemical change forms new substances with di…
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determine the balanced equation for the neutralization reaction between…
$H_2SO_3 + 2LiOH=Li_2SO_3+2H_2O$
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question 9 (1 point) chlorine 36 has an abundance of 24.22% what is the…
Question 9: c Question 10: c Question 11: a
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question 8 (1 point) (02.06 mc) which of the following elements in the …
- Question 8: B. Chlorine (Cl), because it is a halogen with a high effective nuclear charge - Question 9: D. Neon (Ne), because it has a high effective nuclear charge and small r…
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question 5 (1 point) (02.06 mc) as you move down group one of the perio…
- Question 5: a. They increase because of the higher number of occupied energy levels. - Question 6: b. Sodium because it has fewer protons attracting electrons in the same energy…
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question 1 (1 point) (02.06 lc) the effective nuclear charge is the sum…
Question 1: b. False Question 2: a. True Question 3: a. True Question 4: d. They decrease, because of the stronger effective nuclear charge.
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rank the following in order of increasing atomic radius 1. f 2. s 3. cl…
Question 3: 1. F, 3. Cl, 2. S Question 4: 3. Na, 1. Mg, 2. Be Question 5: c. Ca
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question 1 (1 point) in the periodic table hydrogen is placed and group…
## Question 1: b. Hydrogen has one outer shell electron and helium has a full valence shell of electrons ## Question 2: 3. B, 1. Ga, 2. Tl
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2. describe the roles of reactants and products in chemical reactions. …
2. Reactants are substances that participate in a chemical reaction and are consumed to form products. Products are the substances that are formed as a result of the chemical reac…
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3. is this process reversible by simple physical means? why or why not?…
1. Type: Synthesis; Balanced: $2Na + Cl_2 ightarrow 2NaCl$ 2. Type: Decomposition; Balanced: $2H_2O_2 ightarrow 2H_2O + O_2$ 3. Type: Combustion; Balanced: $2C_2H_2 + 5O_2 ightarr…
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b. iron reacts with oxygen to form rust. unbalanced equation: fe + o₂ →…
1. $4Fe + 3O_2 ightarrow2Fe_2O_3$ 2. Synthesis reaction 3. 90 4. To satisfy the Law of Conservation of Mass 5. Formation of a precipitate and change in clarity 6. Precipitate
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data analysis for each sect of reactions below, write a balanced molecu…
a. Molecular: $Mg(s)+2HCl(aq) ightarrow MgCl_2(aq) + H_2(g)$ Total Ionic: $Mg(s)+2H^{+}(aq)+2Cl^{-}(aq) ightarrow Mg^{2 +}(aq)+2Cl^{-}(aq)+H_2(g)$ Net Ionic: $Mg(s)+2H^{+}(aq) igh…
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question 3 of 19 chemistry: fundamentals and principles presented by ma…
Strong acid: $HBr$, $HClO_4$ Weak acid: $HF$, $H_3BO_3$ Strong base: $Ca(OH)_2$, $CsOH$ Weak base: $NH_3$
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chemistry: fundamentals and principles presented by macmillan learning …
Strong acid: HBr Weak acid: (No compound provided in this category from the given ones) Strong base: (No compound provided in this category from the given ones) Weak base: NH₃
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1. define a chemical reaction.
A chemical reaction is a process in which reactants are converted into products through the breaking and forming of chemical bonds.
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6. you slice a loaf of bread into thin pieces. later, one slice is toas…
The browning of the bread and the development of a different flavor and texture are clues that the toasting involves a chemical change.
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5. you add a scoop of sugar into your glass of hot tea. later, after yo…
Adding sugar to tea is a physical change; digesting sugar is a chemical change.
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you are given a 2m stock solution of nacl and are asked to make up 100 …
B. I would add 50 ml of the stock to 50 ml of water.
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you are given a 2m stock solution of nacl and are asked to make up 100 …
B. I would add 50 ml of the stock to 50 ml of water.
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4. a cube of ice melts into liquid water in your glass. later, the wate…
No, neither of these are chemical changes. They are physical changes as the chemical composition of water (H₂O) remains the same throughout the melting and boiling processes; only…
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what happens during evaporation? a liquid changes to a gas. a liquid ch…
A. A liquid changes to a gas.
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the diagram shows changes of state between solid, liquid, and gas. the …
Q
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ag₂o → __ ag + __ o₂ reactants products atoms total number atoms total …
$2Ag_2O ightarrow 4Ag + O_2$
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polonium has a mass number of 212 and an atomic number of 84. in a bala…
82 (corresponding to the first option in the multiple - choice list)
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which statement about the balanced equations for nuclear and chemical c…
A. A nuclear equation is balanced according to mass number. A chemical equation is balanced according to the number of atoms before and after the change.
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what is an example of a colloid? gasoline windshield wiper fluid salad …
1. D. milk 2. C. mud in water 3. A. gasoline
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which phrase describes transmutation? (1 point) the conversion of an at…
the conversion of an atom of one element into a different element through nuclear changes
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the element radium has a mass number of 226 and an atomic number of 88.…
C. 138
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a pure substance that consists entirely of 1 type of atom is an...... a…
- First question: B. element - Second question: C. neon, D. nitrogen, E. lead - Third question: C. nitrogen
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carbon uranium hydrogen helium used to date mummies very stable and non…
Carbon: used to date mummies Uranium: radioactive Hydrogen: explosive, very reactive, made of sun Helium: very stable and non reactive
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zn + h₃po₄ → zn₃(po₄)₂ + h₂ reactants products atoms total number atoms…
3, 2, 1, 3
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passage 1 excerpt from society and solitude by ralph waldo emerson the …
Both passages stress the importance of individual contemplation.
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complete the table below. for example, in the first row decide whether …
| element | most likely ion | | | ---- | ---- | ---- | | | symbol of ion | type of ion | | scandium | $Sc^{3+}$ | cation | | cesium | $Cs^+$ | cation | | sulfur | $S^{2 -}$ | anio…
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a gravel can be broken down into different kinds of substances by physi…
D. heterogeneous mixture
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1) the solubility of a compound is 59 g / 100 ml in boiling methanol an…
Methanol is a better solvent for recrystallization of the compound because it has a larger difference in the solubility of the compound between high and low temperatures compared …
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how is weight different from mass? weight changes depending on gravity,…
1. Weight changes depending on gravity, mass stays constant throughout the universe. 2. Reactants 3. Product
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there are several statements in the table below. for each, determine wh…
| Statement | Negation? (Yes/No) | |--|--| | I am in history class. | No | | I am not in chemistry class. | Yes | | I am not in physics class. | No | | It is not the case that I a…
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a. what effect does adding a solute to a solvent have on the freezing p…
a. Adding a solute lowers the freezing - point. Equation: $\Delta T_f = iK_fm$. b. Adding a solute raises the boiling - point. Equation: $\Delta T_b = iK_bm$. c. Equation: $PV = n…
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c. match each property of solids with its definition. (2 points) a. bri…
Ability to be bent or flattened - D. Malleability Ability to move heat or charge - C. Conductivity Tendency to break rather than bend - A. Brittleness Ability to be stretched with…
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c. match each property of solids with its definition. (2 points) a. bri…
1. D. Malleability 2. C. Conductivity 3. A. Brittleness 4. B. Ductility a. A solution is a homogeneous mixture. The solute is uniformly distributed at a molecular/ionic level in t…
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q4.10. marathon runners can lose a great deal of na⁺ (through sweat). s…
$Na^+$ loss and dilution has lowered the $Na^+$ concentration outside of neurons so that less $Na^+$ flows into neurons through open $Na^+$ channels.
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multiple - choice question the heat from the room makes the molecules m…
faster and faster and they move farther and farther apart.
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gaseous ammonia chemically reacts with oxygen (o₂) gas to produce nitro…
$2.7$ mol
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a major component of gasoline is octane (c₈h₁₈). when liquid octane is …
$0.045$ mol
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ammonium phosphate ((nh4)3po4) is an important ingredient in many solid…
$0.15\ mol$
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select the correct answer. an archer pulls back the string of a bow to …
B. elastic
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6. compare calorimetry (burning food to heat water) with mantle convect…
In calorimetry, chemical energy in food is converted to thermal energy to heat water. In mantle convection, thermal energy in the Earth's mantle causes material to move (mechanica…
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in what way are the lines of \the weary blues\ similar to the lyrics of…
The poem uses repetition to create meaning.
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read the descriptions of rhyme schemes below. free verse: poetry that d…
D. couplets
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4 how does burning food in a calorimeter demonstrate that food contains…
When food burns in a calorimeter, chemical bonds break and release heat energy, demonstrating stored chemical energy.
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if you take a 12.0 - ml portion of the stock solution and dilute it to …
If the initial concentration is assumed to be 1 M, the final concentration is approximately $0.0171\ M$
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select the correct answer. which type of energy is thermal energy a for…
B. kinetic energy
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select the correct answer. which sentence describes an object that has …
D. A boat sails across the ocean.
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select the correct answer. which sentence describes an object that has …
D. A boat sails across the ocean.
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part 2/2 moles, grams, molecules how many grams of na are in 5.42 x10^2…
207
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solid magnesium carbonate reacts with an aqueous solution of perchloric…
$MgCO_3(s)+2HClO_4(aq)=Mg(ClO_4)_2(aq)+H_2O(l)+CO_2(g)$
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question 19 0.1 pts part 1/2 moles, grams, molecules how many moles of …
9.0
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determine the empirical formula for the compound whose percentage compo…
a. 232 b. 12 c. 11 d. 112 e. 342 f. 121 g. 12 h. 12 i. 25 j. 12 k. 38 l. 13
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what is the empirical formula of a compound that was calculated from th…
451
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question 15 0.1 pt how many repeat empirical formula units are in \f\? …
5
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question 2 in a coal power plant the following conversion process happe…
A. mechanical energy to electrical energy
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word meaning in the preface to a dictionary of the english language qui…
C. seeks literary recognition for his publication.
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what is the empirical formula for \i\? input the subscript values accor…
239
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2. next, we determine the number of moles of acid that reacted in the t…
Cannot be determined without additional data (such as volume and molarity of NaOH and mass of unknown acid)
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question 7 4al₂(co₃)₃ # of molecules is # of elements is there are alum…
# of molecules is 4 # of elements is 3 There are 8 Aluminum atoms There are 12 Carbon atoms There are 36 Oxygen atoms
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question 5 ba3(po4)2 # of molecules is # of elements is there are bariu…
# of molecules is 1 # of elements is 3 There are 3 Barium atoms There are 2 Phosphorus atoms There are 8 Oxygen atoms
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question 4 k₂co₃ # of molecules is # of elements is there are potassium…
# of molecules is 1 # of elements is 3 There are 2 Potassium atoms There are 1 Carbon atoms There are 3 Oxygen atoms
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question 9 0.1 pts how many grams are in 5.18 x 10^-4 moles of \d\? inp…
$0.2345504$
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1. we will first find the number of moles of base (naoh) used to neutra…
The moles of base ($NaOH$) can be found using the formula $Moles\ of\ base = Molarity\times Volume\ of\ base\ used (L)$ after substituting the known values of molarity and volume …
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practice it chemical released by the terminal buttons that allows neuro…
Neurotransmitter
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question 7 0.1 pts how many moles are in 6.91 grams of potassium to the…
0.177
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complete and balance the following molecular equation. cu(oh)2(s) + hcl…
Molecular equation: $Cu(OH)_2(s)+2HClO_4(aq) ightarrow Cu(ClO_4)_2(aq) + 2H_2O(l)$ Net - ionic equation: $Cu(OH)_2(s)+2H^+(aq) ightarrow Cu^{2 +}(aq)+2H_2O(l)$
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question 6 0.1 pts how many moles are in 45 grams of magnesium to the c…
1.9
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6. use a funnel to fill a clean buret to the 25 ml mark with 0.100 m na…
The molar mass of the unknown acid is approximately $218.45\ g/mol$.
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complete and balance the following molecular equation. hbr(aq) + ca(oh)…
Molecular equation: $2HBr(aq)+Ca(OH)_2(aq) ightarrow CaBr_2(aq) + 2H_2O(l)$ Net - ionic equation: $H^+(aq)+OH^-(aq) ightarrow H_2O(l)$
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part b hcl is a weak acid submit request answer false hcl is a strong a…
Part A: False. HCl is a strong acid, it is completely ionized in solution. Part B: True. Orthophosphoric acid, $H_3PO_4$, is a triprotic acid, it has three ionizable hydrogen atom…
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write a balanced equation for the reaction of koh and cu(no3)2. express…
$2KOH(aq)+Cu(NO_3)_2(aq) ightarrow 2KNO_3(aq)+Cu(OH)_2(s)$
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write a balanced equation for the reaction of na2s and cdso4. express y…
$Na_2S(aq)+CdSO_4(aq) ightarrow Na_2SO_4(aq)+CdS(s)$
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question 8 during the reactions this type of energy may be given off he…
- Question 8: heat - Question 9: feedback
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1. explain why nuclear fission releases so much more energy than chemic…
Nuclear fission releases more energy as it involves splitting of atomic nuclei and conversion of a small amount of mass into energy based on $E=mc^{2}$, while chemical reactions o…
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1. what is nuclear fission? a. the process of combining two small atoms…
1. d. The process of splitting a large atom into smaller atoms 2. b. Energy and mass 3. c. At least a million times more 4. c. Uranium 5. b. Nuclear fusion 6. b. 14% 7. c. Maintai…
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annabel lee poetry analysis directions: answer the questions using the …
1. Edgar Allan Poe 2. The lover of Annabel Lee 3. A kingdom by the sea 4. a. Six stanzas; b. Varies (6, 6, 6, 8, 4, 6); c. Varies (e.g., ABABCB in some stanzas) 5. Lines 25 - 28 6…
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complete the following decay equations you will need a periodic table 8…
$^{238}_{92}U ightarrow^{4}_{2}He+^{234}_{90}Th$; $^{214}_{82}Pb ightarrow^{0}_{ - 1}e+^{214}_{83}Bi$
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a bond is formed between water molecules making water stay in a liquid …
Hydrogen
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in order to form water, each hydrogen atom shares its electrons with th…
B. Covalent
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in a molecule of potassium chloride salt, the chlorine atom has the abi…
A. Ionic
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there are three major types of bonds: ionic, covalent, and hydrogen. wh…
Electrons
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using solubility guidelines, predict whether each of the following comp…
Soluble: $ZnSO_{4}$, $MgBr_{2}$, $Sr(OH)_{2}$, $(NH_{4})_{2}CO_{3}$ Insoluble: $PbI_{2}$
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cl- always spectator ion not always spectator ion submit request answer…
For $Cl^-$: not always spectator ion For $NO_3^-$: not always spectator ion
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question 21 which statement is not true of molecular orbitals? the numb…
Antibonding molecular orbitals are higher in energy than all of the bonding molecular orbitals.
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consider the species n₂⁻, n₂, and n₂⁺.which of these species will be pa…
For the first question: C. $N_2^+$ and $N_2^-$ For the second question: B. 1 -
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which ions remain in solution after pbl2 precipitation is complete? exp…
K⁺,NO₃⁻
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how many single bonds are bonded to sulfur in sf₆? 2 4 6 7 8 question 1…
6 ### Question 18: In the following Lewis structure for ClO₃F, chlorine has a formal charge of ___ and an oxidation number of ___.
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the number of resonance structures for the nitrate ion that satisfy the…
First question: C. 3 Second question: A. $SO_3$
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in the lewis structure of the iodate ion, io₃⁻, that satisfies the octe…
Question 1: C. 0 Question 2: B. 2