Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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helium (he) has two valence electrons, and these electrons are located …
1. Group 8A, Period 1 2. halogens
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question 17 which of the following elements belongs to the p - block? ○…
Question 17: oxygen Question 18: 3
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question 15 1 pts which of the following is a brittle solid? chlorine s…
Question 15: sulfur Question 16: alkali metals
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question 13 1 pts which of the following is the most specific classific…
Question 13: lanthanide - series element Question 14: chlorine
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question 11 1 pts which of the following groups contains mostly radioac…
Question 11: inner transition metals Question 12: noble gas
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question 9 1 pts which of the following lists the elements in order of …
Question 9: Se, Sb, Sn Question 10: plutonium
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arsenic is a metalloid. how many valence electrons does arsenic have? 6…
1. B. 5 2. C. tellurium
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question 5 to what group do oxygen, nitrogen, and sulfur belong? alkali…
Question 5: nonmetals Question 6: O, Ge, Mn
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question 3 1 pts sodium, potassium, and cesium belong to which group? a…
Question 3: B. alkali metals Question 4: A. by increasing atomic number
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75. zinc metal reacts with hydrochloric acid according to the following…
$-159.4\ kJ/mol$
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question 1 which of the following is a characteristic of nonmetals? non…
Question 1: Nonmetals are not ductile. Question 2: inner transition metals
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chemistry 201 - 31, assignment 2 (25 points) 1) please name the followi…
a. (E)-2 - heptene - 6 - methyl b. 1 - chloro - 3,3 - diethylcyclohexene c. 1,6 - diisopropyl - 3 - hexyne d. 2 - methyl - 1,3 - dibromobenzene
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q 13 analyze the concept map below, then answer the question. which ter…
Q13: C. malleable Q14: C. The molecules in hot water move faster and are slightly further apart
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the reliability of a measurement and significant figures 49. read each …
(a) 72.0 mL (3 significant figures), (b) 8.50 mL (3 significant figures), (c) 570 mL (3 significant figures)
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give the iupac name for each of the following structures:
1. Heptane 2. 3,5 - Dimethylheptane 3. 6 - Fluoro - 2 - methylheptane 4. 4 - Bromo - 3 - fluoro - 1 - pentene 5. (E) - 1 - Iodo - 2 - butene 6. 1 - (Cyclopenten - 1 - yl)ethane 7.…
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3. examine the pictures below. color the unsaturated fat green and the …
Color structure A red (saturated fat) and structure B green (unsaturated fat). The elements shown above are carbon (C), hydrogen (H), and oxygen (O).
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data sheet 1 mass of crucible + cover 31.885 g 2 mass of crucible + cov…
The empirical formula of the oxide product is MgO.
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post - lab questions: 1. write the balanced chemical equation for the r…
1. $2Mg + O_2 ightarrow2MgO$ 2. Theoretical yield calculation depends on the initial mass of Mg. If mass of Mg is $m_{Mg}$ grams, $m_{theo - MgO}=\frac{m_{Mg}}{24.31}\times40.31$ …
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concept 2 notes: properties of matter physical properties: properties t…
Physical Properties: properties that can be observed **directly** or measured without changing the **chemical composition** of the substance. - Ex. Mass, **volume**, shape, size, …
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students were investigating mixtures. during the investigation, they we…
D. Results 3 and 4 ### Q9
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4. the state in which the body is poisoned by alcohol or another substa…
4. B. Intoxication 5. A. Blood Alcohol Concentration 6. C. Substance Abuse 7. D. Addictive Drug 8. A. Fetal Alcohol Syndrome 9. D. Alcoholism
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give the structure for each of the following organic compounds: 1. buta…
1. $CH_3CH_2CH_2CH_3$ 2. $CH_3CH(CH_3)CH(CH_2CH_3)CH_2CH_2CH_2CH_2CH_3$ 3. $CH_3CH_2CH_2CH(CH(CH_3)_2)CH_2CH_2CH_2CH_2CH_3$ 4. $(CH_3)_3CCHI(CH_3)_2$ 5. Cyclohexane ring with $-Br…
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question 6 of 10 the burette can be filled close to the top (0 ml) mark…
True
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a model of a beryllium atom is shown below. what types of particles are…
B. Negatively charged particles only
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question 5 of 10 why was phenolphthalein added to the flask? select all…
A. It will act as an indicator. B. Without it, the solution would not turn a different color and you would not know when the equivalence point had been reached. D. It will turn th…
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question 4 of 10 the amount of 50% ethanol solution added has to be exa…
True
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why was the mass of the erlenmeyer flask determined before adding the a…
The mass of the aspirin tablet equals the mass of the flask containing the aspirin minus the mass of the flask.
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17 two students are conducting an experiment in a lab. as two liquid su…
Part A: D. 360.1 g Part B: B. The total mass before the reaction is greater because some of the gaseous product escaped into the atmosphere reducing the mass of the product.
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15 what is the difference between carbon monoxide and carbon dioxide? a…
B. Carbon monoxide has only one oxygen atom.
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15 all isotopes with atomic numbers over 84 are _. a nonmetals b radioa…
B. radioactive
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14 which of these is not evidence of a chemical reaction? a an antacid …
D. An ice cube melts into liquid water.
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the compound aluminum chloride has 1 aluminum atom and 3 chlorine atoms…
D. $AlCl_{3}$
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oxygen hydrogen nitrogen carbon a. b. c. d. compare and contrast model …
C. They are composed of different elements in different ratios
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identify the reactants, the products and their quantities in the follow…
Reactants: $Cu(NO_3)_2(aq), H_2S(g)$ Products: $CuS(s), 2HNO_3(aq)$
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antoine lavoisier found that mass was conserved in chemical reactions w…
C. the mass of the products was the same as that of the reactants
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oxygen is a colorless, odorless, and tasteless gas that must be present…
C. The elements will form bonds where two hydrogen atoms share electrons with one oxygen atom to fill all three atoms' outermost energy levels.
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fill blank boxes with the right answer. when 46 g of sodium is exposed …
16
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the chemical formula for sucrose is shown below c₁₂h₂₂o₁₁ how many atom…
D. 12 carbon atoms, 22 hydrogen atoms, and 11 oxygen atoms
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a chemical reaction for the reaction of sodium hydroxide (naoh) and hyd…
B. 28 g
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the periodic table of elements identify the atomic symbol for nitrogen.…
A. N
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now predict how many atoms of lithium - 7 and lithium - 6 are needed to…
5) 17 6) 17 7) Cl - 35: 31 atoms, 77.5% Cl - 37: 9 atoms, 22.5%
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in your lab, the mass of your product is less than the mass of your rea…
B. The chemical reaction is in an open system and a gas is being released into the atmosphere.
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7 which type of reaction is shown in the chemical equation 2h₂o → 2h₂ +…
B. decomposition
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place polyatomic ions in the box on the left and place non - polyatomic…
Polyatomic ions: $\text{PO}_4^{3 -}$, $\text{NH}_4^{+}$, $\text{OH}^{-}$, $\text{CO}_3^{2 -}$ Not Polyatomic ions: $\text{O}^{2 -}$, $\text{Ca}^{2 +}$, $\text{Cl}^{-}$, $\text{Na}…
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identify each model of a chemical reaction.
1. synthesis 2. single displacement 3. decomposition 4. double displacement
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los sonidos ke y ki se escriben en español con q, seguida siempre de un…
1. Escucha! Es el cuarteto italiano. 2. El cuadrilátero tiene cuatro lados. 3. La química es una materia difícil. 4. ¿Cuál es tuyo? 5. El ecuador limita la zona tropical. 6. ¿Cuán…
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which statement is not true about all the isotopes of an element? a the…
A. They have the same mass number.
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nitrogen is important to the chemical industry. it is used to make fert…
C. phosphorus (P)
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3) look at boron. it has two possible isotopes. based on the average at…
The most abundant isotope of boron in nature is boron - 11. This is because the average atomic mass of boron (10.81) is closer to the mass of boron - 11 than to the mass of boron …
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1) if the average atomic mass of hydrogen in nature is 1.0079, what doe…
The high percentage (80%) of H - 1 in nature compared to H - 2 (20%) explains why the average atomic mass of hydrogen is close to the mass of H - 1.
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question 7 of 9 your procedures for this lab will have you use a differ…
B. KHP (potassium hydrogen phthalate)
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which atmospheric gas is being described? a noble gas (non - reactive),…
B. argon
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the atmosphere has approximately 78% nitrogen and 21% oxygen. all other…
1%
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8 which biogeochemical substance functions as a blanket causing the gre…
Carbon dioxide
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2 what are places in the environment that provide short - term storage …
B. Exchange pools
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in the chemical reaction that forms table salt (nacl), which two elemen…
D. Sodium and chlorine
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during a lab investigation, students measured the mass of some substanc…
A. Reaction 1 reacted with a gas in the air and Reaction 2 released gas as a product
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the equation below shows the products formed when a solution of silver …
C. equal to the total mass of the products
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question 3 of 9 standardization allows you to determine the exact conce…
True
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3. analyze: what trend do you notice? distance (no units) ionization en…
# Explicación detallada: ## Paso 1: Observar los datos Al observar los valores de energía de ionización en la tabla, vemos que disminuyen a medida que la distancia aumenta. ## Pas…
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question 2 of 9 the exact volume of 6.0 m naoh is not needed when prepa…
True
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73. when 0.5141 g of biphenyl (c₁₂h₁₀) undergoes combustion in a bomb c…
$\Delta_{r}U=-6321.5\ kJ/mol$, $\Delta_{r}H=-6327.7\ kJ/mol$
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question 1 of 9 rate the following with respect to accuracy of measurem…
volumetric flask > 10 mL graduated cylinder > Erlenmeyer flask
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please respond to the question below in your own words with proper cita…
For a local organic grocery store: Target customers: Health - conscious individuals aged 25 - 55, with moderate to high income, interested in healthy eating, sustainability, and a…
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71. exactly 1.5 g of a fuel burns under conditions of constant pressure…
Measurement A corresponds to constant pressure. Measurement B corresponds to constant volume.
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2 · elements and compounds station 9 · chemical change there are 5 sign…
1. Change in color 2. Formation of a precipitate 3. Evolution of a gas (bubbling) 4. Change in temperature (exothermic or endothermic) 5. Production of light or sound (in some rea…
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the table lists some compounds found in foods and their formulas. based…
A. A molecule of maltitol has twice as many atoms as a molecule of glucose does. B. A molecule of xylitol contains half as many atoms as a molecule of glucose does.
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a sample of ammonium nitrate (a white solid) is placed in an erlenmeyer…
C. The balloon only inflates due to thermal expansion, a physical process
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the periodic table of elements part a students were using the chemical …
C. Kennedy
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this is methane. methane is a gas that is found in small quantities in …
C. $CH_4$
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igneous rocks can be formed from magma that solidifies deep beneath the…
B. Metamorphic rock because of its stripes.
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sedimentary rock formation occurs when igneous, metamorphic, or other s…
C. Physical weathering
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in any chemical process, matter is neither lost nor gained. the changin…
- Chemical Reaction: The changing of substances to other substances by the breaking of bonds in reactants and the formation of bonds in products - Reactants: These are the element…
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e. some compounds can be synthesized by combination of the elements 16.…
18. \(2Na(s)+O_2(g) ightarrow Na_2O_2(s)\) 19. \(2H_2(g)+O_2(g) ightarrow 2H_2O(aq)\) 20. \(N_2(g)+3H_2(g) ightarrow 2NH_3(g)\) 21. \(P_4(s)+6H_2(g) ightarrow 4PH_3(g)\) 25. \(2Na…
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4. an unsaturated fat can be turned into a solid or semisolid state by …
C. hydrogenation
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61. consider the thermochemical equation for the combustion of acetone …
The heat released is $4299\ kJ$ (rounded to four - significant figures).
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9 which of the following types of energy do hydroelectric power plants …
Gravitational potential energy
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differentiate among the procedures in miller and ureys experiment, and …
Earth's early atmospheric composition differed from the simulated gases within Miller and Urey's original experiment, however, subsequent scientific experiments, changing the gase…
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use this diagram to answer the following questions. 4th attempt part 1 …
Part 1: 35.0 °C Part 2: 55.0 °C
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which ion is formed when an atom of fluorine (f) gains one electron? f⁻…
A. $F^{-1}$
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earth formed from where massive materials were thrown out from the earl…
accretion, protostar, craters, 500, organic, celestial, meteorites
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pre - laboratory exercise: 1. define the following terms: amphoteric a …
a. The molar mass of sodium alum, $NaAl(SO_{4})_{2}\cdot12H_{2}O$ is $474.35\ g/mol$. b. The theoretical yield of sodium alum is $17.67\ g$. c. The percent yield of sodium alum is…
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determine the statements that describe early earth according to current…
Early Earth may have had life originate from inorganic molecules that formed organic, carbon - based molecules. Early Earth may have had life originate from organic molecules that…
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structure of matter elements are pure substances composed of only one t…
Sugar: 180.096 amu Carbon - Dioxide: 43.99 amu Penicillin: 334.344 amu
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21. describe the basic organizational feature of the periodic table of …
Elements are arranged by atomic number in periods and groups, with periods related to electron - shell number and groups having similar chemical properties based on valence electr…
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21. describe the basic organizational feature of the periodic table of …
Elements are arranged in order of increasing atomic number, in periods (rows) and groups (columns). Periods correspond to electron - shell levels and elements in the same group ha…
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q1 chemistry: u2l14 electron config day 4 prepwork part 1: electron con…
| Element | Full $e^{-}$ configuration | Orbital notation | Noble gas config. | | ---- | ---- | ---- | ---- | | C | $1s^{2}2s^{2}2p^{2}$ | $\frac{\uparrow\downarrow}{1s}\frac{\upa…
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part 3 (1 point) now draw the lewis structure for nh₃o, paying attentio…
The Lewis structure has O in the center, single - bonded to N which is single - bonded to 3 H atoms. O has 2 lone - pairs and N has 1 lone - pair.
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part 1 (1 point) hydroxylamine (nh3o) is an intermediate in a variety o…
Part 1: 14 Part 2: N will be bonded to O; Both N and O have at least one H atom.
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3. energy is given off during a chemical reaction because are combining…
3. Chemical bonds change, releasing energy. 4. Acid and salt react with copper oxide. 5. Carbon dioxide (and sodium acetate and water). 6. Sodium; Chlorine 7. Fireworks 8. Cold; E…
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part 2 (1 point) draw lewis structures for pyrazine (c4h4n2) showing th…
(It is not possible to directly draw Lewis structures in this text - based format. But the description above can be used to draw them. The two resonance structures will have a six…
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synthesize carbon combines with oxygen to form two compounds, carbon mo…
The mass of oxygen in carbon dioxide that combines with a fixed mass of carbon is twice the mass of oxygen in carbon monoxide that combines with the same fixed mass of carbon.
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multiple select question select all that apply exemplify chemical media…
Pyrogens, Histamine, Cytokines, Complement, Antibodies
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when fat comes in contact with sodium hydroxide, it produces soap and g…
This is a chemical change.
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2nd attempt part 1 (1 point) see periodic table see hint complete both …
# Explanation: ## Step1: Determine the total valence electrons Nitrogen (N) has 5 valence - electrons, oxygen (O) has 6 valence - electrons, and hydrogen (H) has 1 valence - elect…
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15 mark for review which choice most logically completes the text? euph…
D. reducing invasive E. esula numbers without harming other organisms.
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section 2 - orbital diagrams (2 points each) draw an orbital diagram fo…
Orbital diagrams are drawn as described above for Silicon and Iron following the rules of electron - filling (Aufbau principle, Pauli exclusion principle, and Hund's rule).
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question 19 (mandatory) (1 point) crushing of a stone is called a) lith…
Question 19: b) lithotripsy Question 20: a) urinalysis
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part 1 (1 point) complete both resonance structures of nitrous acid, hn…
The first resonance structure: $H - O - N=O$, where the oxygen bonded to hydrogen has 3 lone - pairs and a formal charge of - 1, nitrogen has 1 lone - pair and a formal charge of …
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part 2 (1 point) the average single and double n - o bond lengths are 1…
Part 2: 129 Part 3: B. No