化学
化学反応、化学量論、分子構造、元素の性質。
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which group of elements is known to react violently with water and give…
- First question: Alkali Metals - Second question: 5
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7 multiple choice 1 point which of the following describes the properti…
7. They are generally unreactive. 8. potassium
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10. name the following ion: nacl (0.5 points) * enter your answer 11. n…
10. Sodium chloride 11. Calcium iodate 12. Potassium oxide
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multiple choice 1 point what is the ground state electron configuration…
For the first question: \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{3}\) (the fourth option). For the second question: valence electrons.
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chemists can identify the composition of some unknown salts by conducti…
For the electron - configuration of potassium: \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}\) (the fourth option). For the electronegativity statement: Fluorine, on the upper right, has…
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from which of the following atoms would it be the most difficult to rem…
Chlorine Cl # 2.
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7. name the following ion: cs+ (0.5 points) * enter your answer 8. what…
7. Cesium ion 8. Cations 9. Magnesium phosphate
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4. write the formula for aluminum nitrate. (0.5 points) * enter your an…
4. \(Al(NO_{3})_{3}\) 5. Fluoride ion 6. Calcium ion
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the compound potassium sulfate, k₂so₄, is composed of ○ 2 atoms of pota…
2 atoms of potassium, 1 atom of sulfur, and 4 atoms of oxygen.
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1. write the formula for calcium arsenite. (0.5 points) * enter your an…
1. \(Ca_{3}(AsO_{3})_{2}\) 2. sulfide ion 3. nitride ion
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what compound is formed when the soft putty - like metal sodium (na) re…
table salt
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how many atoms of carbon are included in one formula unit of the compou…
\(2\)
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which change can be classified as a chemical change? ○ a piece of paper…
a piece of paper burning to form ash
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what is an outcome that is common to all substances that undergo a chem…
The atoms of the substances are rearranged, forming a new substance.
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pb + feso₄ → pbso₄ + fe ○ single replacement ○ double replacement ○ syn…
single replacement
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co--->c+o decomposition combustion synthesis double replacement single …
decomposition
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c4h12 + o2 → co2 + h2o decomposition combustion synthesis double replac…
combustion
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na3po4 + koh → naoh + k3po4 decomposition combustion synthesis double r…
double replacement
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hbr + al(oh)3 → h2o + albr3 decomposition combustion synthesis double r…
double replacement
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nabr+ca(oh)2----> cabr2+naoh decomposition combustion synthesis double …
Double replacement
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pb + h_{3}po_{4} → pb_{3}(po_{4})_{2} decomposition combustion synthesi…
single replacement
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li3n + nh4no3 → lino3 + (nh4)3n single replacement double replacement s…
double replacement
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c₂h₆o + o₂ → co₂ + h₂o o decomposition o combustion o synthesis o doubl…
combustion
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how many electrons can the d sublevel hold? 4 8 10 2
10
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nh₃ + h₂so₄ → (nh₄)so₄ decomposition combustion synthesis double replac…
Synthesis
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22/23 which electron configuration belongs to silver? 1s² 2s² 2p⁶ 3s² 3…
\(1s^{2}2s^{2}2p^{6}3s^{2}3p^{5}4s^{2}3d^{10}4p^{6}5s^{1}4d^{10}\)
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what is the shorthand electron configuration for sulfur atom? he 3s²3p⁴…
[Ne] \(3s^{2}3p^{4}\)
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20/23 what atom matches this electron configuration? xe6s²4f¹⁴5d⁹ gold …
B. Platinum
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what noble gas should be used to write the shorthand configuration for …
Kr
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what electron configuration matches an chromium atom? 1s²2s²2p⁶3s²3p⁶4s…
B. \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}3d^{5}\)
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how many d orbitals are there in a given sublevel? 1 7 5 3
C. 5
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what atom matches this electron configuration? 1s²2s²2p⁶3s² potassium m…
Magnesium
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balancing equations 1. h₂ + o₂ → h₂o 2. na + cl₂ → nacl 3. mg + o₂ → mg…
1. $2H_{2}+O_{2}\to 2H_{2}O$ 2. $2Na + Cl_{2}\to 2NaCl$ 3. $2Mg+O_{2}\to 2MgO$ 4. $4Fe + 3O_{2}\to 2Fe_{2}O_{3}$ 5. $C+O_{2}\to CO_{2}$ 6. $N_{2}+3H_{2}\to 2NH_{3}$ 7. $4Al + 3O_{…
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the electron configuration of an atom is $1s^{2}2s^{2}2p^{6}$. the numb…
10
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1s/23 which electron configuration belongs to chlorine (cl)? 1s²2s²2p⁶3…
A. \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{5}\)
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what element has the electron configuration 1s²2s²2p³ nitrogen magnesiu…
A. Nitrogen
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how many electrons can the first energy level hold?
A. 2
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how many electrons does si contain? (click to see imag
14
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each row on the periodic table represents: an electron a sublevel an en…
an energy level
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what atom matches this electron configuration? 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰ z…
A. Zinc
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how many p orbitals are there in a sublevel?
A. 3
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which electron configuration belongs to chlorine (cl)? 1s² 2s² 2p⁶ 3s² …
1s² 2s² 2p⁶ 3s² 3p⁵
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identify the electron configuration for aluminum (al) 1s² 2s² 2p⁶ 3s² 3…
C. \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{1}\)
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what element has the electron configuration $1s^{2}2s^{2}2p^{6}$ magnas…
D. Oxygen
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what electron configuration matches an oxygen atom? 1 2 3 4 1s²2s²2p⁶ 1…
4. \(1s^{2}2s^{2}2p^{4}\)
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after hydrogen, what do you start all electron configurations with? 1d^…
\(1s^{2}\)
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which type of energy is associated with motion? potential energy therma…
Kinetic energy
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in which of the following options are ca o, s, and ge arranged in order…
D. \(O, S, Ge, Ca\)
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6. you find that 7.36 grams of a compound has decomposed to give 6.93 g…
The percent composition of oxygen is approximately \(94.16\%\) and the percent composition of hydrogen is approximately \(5.84\%\)
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what is the ground state electron configuration for the sn4+ ion (z=50)…
C. \([Kr]4d^{10}\)
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what type of energy conversion occurs in solar panels? thermal to elect…
Light to electrical
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in a car engine, what type of energy is converted to kinetic energy? ch…
Chemical energy
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which one of the following atoms has 5 unpaired electrons in its ground…
A. \(Cr(Z = 24)\)
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bubbles are seen coming out of a reaction. angela holds an upside down …
\(H_2(g)\)
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enter the chemical formulas of the products for the following chemical …
First box: \(PbCl_{2}\) Second box: \(NaNO_{3}\)
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adrian notices a precipitate form. based on the solubility rules, the c…
\(Au_{2}CO_{3}(s)\) (the fourth option)
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chemical reactions: lab practice casey coker what evidence is there tha…
Color change, Light production, Temperature change, Gas formation
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4. to calculate the volume of collected gas at stp, i used combined gas…
\(V_{2}\approx48.0mL\)
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what type of reaction is described below? \when there is no observable …
No reaction.
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6. which element in water has greater electronegativity? a. hydrogen b.…
6. B. Oxygen 7. B. Cohesion between molecules 8. C. \(104.5^{\circ}\) 9. B. The Sun's energy 10. B. Evaporation 11. B. Condensation of water vapor 12. C. Precipitation
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read each question carefully and circle the correct answer (a, b, 1. th…
1. B. Unequal sharing of electrons between hydrogen and oxygen 2. C. Slightly negative 3. B. Covalent bonds 4. C. Hydrogen bond 5. B. It can dissolve many substances due to its po…
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pv = nrt (102.5kpa)0.05l = n(8.31)(273 + 20.4k)
# 1. 單位換算 ## Step1: 將壓力單位換算為帕斯卡，體積單位換算為立方米 - 已知 \(1kPa = 1000Pa\)，則 \(102.5kPa=102.5\times1000Pa = 102500Pa\)。 - 已知 \(1L = 1\times10^{- 3}m^{3}\)，則 \(0.05L = 0.05\times10^{-3}m^{3…
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student name: date: block: duration: 45 mins total marks: 100 read each…
B. Unequal sharing of electrons between hydrogen and oxygen
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question 1. arrange the following subshells in order of increasing ener…
\(2p\), \(3s\), \(3p\), \(4s\), \(3d\)
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identify of each element with the election configuration by its chemica…
\([Ar]4s^{1}\to\) Potassium (\(K\)); \([Ar]4s^{2}3d^{10}4p^{5}\to\) Bromine (\(Br\)); \(1s^{2}2s^{2}\to\) Beryllium (\(Be\))
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which sequence of elements is arranged from smallest to largest atomic …
A. \(Al, Si, P\)
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which set of elements exhibit the most similar chemical properties? o n…
Li, Na, K
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one method for determining the identity of an unknown organic compound …
B. \(CH_{2}\)
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periodic table calcium fluoride (caf₂) is a major component in human te…
D. \(51.3\%\text{ Ca}, 48.7\%\text{ F}\)
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write in the electron configuration of each neutral element. use just p…
Ne: \(1s^{2}2s^{2}2p^{6}\) C: \(1s^{2}2s^{2}2p^{2}\) Ti: \([Ar]3d^{2}4s^{2}\)
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when a 16.50 - g sample containing nickel and oxygen is analyzed, 5.87 …
\(35.6\%\) nickel \(64.4\%\) oxygen
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states that every sample of the same substance contains identical eleme…
The law of definite proportions
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which of the following is (are) a universal precaution with working wit…
1. d. all of these 2. c. notify the instructor 3. c. Leave your work area as clean, or cleaner, than you found it. 4. d. all of the above
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as precious as the gods do eat, shall on an ivory table be prepared eac…
First question: C. 7 quatrains with an aabb rhyme scheme Second question: C. The rhymed couplets of the poem help make a list of ways the speaker will show love; D. The poem opens…
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2. complete the table below to compare the different types of covalent …
- **Electrons shared**: - Single Bond: one pair of electrons - Double Bond: two pairs of electrons - **Example**: - Double Bond: oxygen gas (\(O_2\)) - Triple Bond: nitrogen gas (…
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question 25. calculate the number of orbitals in the 3rd principal ener…
The number of orbitals in the \(3^{rd}\) principal energy level (\(n = 3\)) is \(9\).
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question 24. calculate the maximum number of electrons in the 4th princ…
The maximum number of electrons in the \( 4^{th} \) principal energy level (\( n = 4 \)) is \( 32 \).
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milk spoiling is an example of which type of change? your answer what t…
Milk spoiling: Chemical change. Mixing air into egg whites to make frosting: Physical change.
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which of these is the most reliable way to see if a new gas has formed?…
- First question: Flame test - Second question: Hydrogen reacts explosively with oxygen in a flame test, usually producing a 'pop' sound as it burns to form water (\(2H_2+O_2 ight…
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what is the evidence that the gas made in the mentos + soda demo was ca…
- First question: The soda already contains dissolved carbon dioxide, and Mentos provide sites for it to escape rapidly (fizzing is evidence of gas release, and since it's from so…
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5. copper (ii) chloride bond: i formula: agno3
Bond: Ionic; Formula: \(CuCl_{2}\)
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how many grams of n₂ are needed to make 444 g of nbr₃? (answer = 24.5 g…
1. \(1.75\times 10^{0}\) 2. F. \(253.719\) 3. C. \(3\) 4. \(1.75\times 10^{0}\) 5. \(8.75\times 10^{-1}\) 6. B. \(2\) 7. S. \(28.013\) 8. \(8.75\times 10^{-1}\) 9. \(2.45\times 10…
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how much energy is evolved/absorbed (answer is __1__ ) when 444 g of nb…
1. BB. evolved 2. A. 1 3. T. 1.750 4. F. 253.719 5. I. 44.0 6. T. 1.750 7. Z. 38.5 8. B. 2
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question 10 (1 point) calculate the % yield for problem number 9 if onl…
1. N. \(500.0\) 2. P. \(90.0\) 3. O. \(556\)
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how many grams of $\\ce{nbr_{3}}$ can be made from $2.22\\times10^{-2}$…
1. F. \(253.719\) 2. B. \(2\) 3. J. \(1.48\times 10^{-2}\) 4. D. \(3\) 5. F. \(253.719\) 6. J. \(1.48\times 10^{-2}\) 7. G. \(3.76\times 10^{0}\) 8. B. \(1\)
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question 4 (1 point) how much heat is __1__ evolved/absorbed when 2.22 …
1. BB. evolved 2. I. \(44.0\) 3. H. \(3.26\times 10^{3}\) 4. A. \(1\)
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question 3 (1 point) how much heat is __1__ evolved/absorbed when 2.22 …
1. BB. evolved 2. DD. exothermic 3. I. \(44.0\) 4. K. \(9.77\times 10^{3}\) 5. A. \(1\)
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question 2 (1 point) how many moles of nbr₃ can be made from 2.22 x 10²…
1. B. 2 2. L. \(4.44\times 10^{2}\) 3. A. 1
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how many moles of br₂ are required to react with 2.22 x 10² moles of n₂…
1. A. \(1\) (for the coefficient of \(N_{2}\) in the balanced equation) 2. C. \(3\) (for the coefficient of \(Br_{2}\) in the balanced equation) 3. B. \(2\) (for the coefficient o…
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calculate the moles of oxygen (atoms) in 10.0 g of aluminum sulfate. th…
1. \(J.0.0292274\) 2. \(F.342.15\) 3. \(H.12\) 4. \(J.0.0292274\) 5. \(K.0.350728\) 6. \(B.1\) 7. \(L.6.022\times 10^{23}\) 8. \(K.0.350728\) 9. \(M.2.11\times 10^{23}\) 10. \(B.1…
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use the molar mass of al₂(so₄)₃ to calculate the number of formula unit…
1. \(K\) (since \(1\) mol has \(6.022\times 10^{23}\) formula units) 2. \(I\) (the number of moles of \(Al_2(SO_4)_3\) is \(0.0292274\) mol) 3. \(L\) (\(1.76\times 10^{22}\) formu…
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question 3 (2 points) use the molar mass of al₂(so₄)₃ calculated in the…
1. B. 1 2. I. 0.0292 3. F. 342.15
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question 2 (2 points) use the data from the previous question calculate…
U. 191.988, V. 56.113, O. 342.15
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use the periodic table to calculate the gfw (molar mass) of aluminum su…
1. B. 2 2. S. 53.962 3. C. 3 4. T. 96.195 5. K. 12 6. U. 191.988 7. O. 342.15
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answer the questions about the reaction that you just balanced. 2 c₆h₁₀…
1. combustion 2. reduced 3. yes 4. yes
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balance the reaction and do not leave any fractions. c₆h₁₀ + o₂ → co₂ +…
1. E. 5 2. F. 6 3. E. 5 4. F. 6 5. E. 5 6. B. 2 7. G. 17 8. H. 12 9. H. 10
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answer the questions about the reaction you just balanced. 3 ba(c₂h₃o₂)…
1. D. double displacement 2. H. no 3. G. yes
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balance the reaction, do not leave any fractions, then answer the quest…
The balanced equation is $3\text{Ba}(\text{C}_2\text{H}_3\text{O}_2)_2 + 2\text{Na}_3\text{PO}_4=6\text{NaC}_2\text{H}_3\text{O}_2+\text{Ba}_3(\text{PO}_4)_2(s)$
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question 5 (2 points) bent molecules like h₂o with __1__ reds are __2__…
1. I. 4 2. B. asymmetrical 3. D. polar 4. I. 4 5. B. asymmetrical 6. C. nonpolar
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question 4 (2 points) pyramidal molecules like nh₃ with __1__ reds are …
1. I 2. B 3. D 4. I 5. B 6. D