Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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which of the structures have a major peak above 3000 cm⁻¹? (select all …
The second and third structures.
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directions: read each prompt carefully and answer to the best of your a…
# Explicación paso a paso: ## Paso 1: Respuesta a la pregunta 1 Durante una reacción química, enlaces se rompen y un nuevo compuesto químico se forma. ## Paso 2: Respuesta a la pr…
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what stretching frequencies (in cm⁻¹) are present in the structure belo…
1715
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unit 3 true/false: write \t\ for true or \f\ for false 1.) if a person …
1. T 2. F (Blood - alcohol content is the amount of alcohol in a person's blood expressed as a percentage; intoxication is the state resulting from alcohol consumption) 3. T 4. T …
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an oxygen atom has a mass of 2.66×10^(-23) g and a glass of water has a…
$15.9$
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how do models help build scientific knowledge? models are used to show …
4. A scientific theory is an explanation for many hypotheses and observations, supported by evidence. It can explain why something happens and predict future events. 5. Scientists…
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part b read each scenario. decide whether a physical or chemical change…
1. Physical Change; Evidence: Change in shape, no new substance formed. 2. Chemical Change; Evidence: Black color, smoke, new substances formed. 3. Chemical Change; Evidence: Redd…
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what is the stretching frequency (in cm⁻¹) of the following carbonyl? 1…
1715
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problem sight along the c2 - c1 bond of 2 - methylpropane (isobutane). …
(a) In the Newman projection of the most stable (staggered) conformation, the large methyl group on C2 is anti - to the methyl group on C1. (b) In the Newman projection of the lea…
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describing properties of thermal energy transfer based on what you have…
The unit often used in chemistry and physics to measure energy, such as for work or electrical current, is the joule. We can also use this unit, as we did in this lab, for measuri…
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what is the stretching frequency (in cm⁻¹) of the following carbonyl? 1…
1715
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question 6 which of the following describes atoms in the excited state?…
unstable some electrons have moved to higher energy levels
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question 5 which of the following describes atoms in the ground state? …
stable, all electrons in lowest energy level, written "correctly"
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what is the stretching frequency (in cm^{-1}) of the following carbonyl…
1715
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write the element name or symbol.
Phosphorus (P)
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question 3 1s²2s²2p⁶3s²3p⁶4s¹3d¹⁰4p³ (example 1) write the element name…
Ge
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question 2 the electron configuration, for an atom in the excited state…
False
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question 5 what is the stretching frequency (in cm⁻¹) of the following …
1745
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mixed challenge 1. compare sodium (na), calcium (ca), and chlorine (cl)…
1. Sodium (Na) is the most reactive among Sodium (Na), Calcium (Ca), and Chlorine (Cl). Sodium is an alkali metal with one valence electron, which it loses easily to achieve a sta…
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what stretching frequencies (in cm⁻¹) are present in the structure belo…
1715
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3. compare reactivity between hydrogen (h), carbon (c), and nitrogen (n…
Hydrogen, carbon, and nitrogen are in the same period. Hydrogen is the most reactive among them because it needs only 1 electron to achieve a stable electron configuration.
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24 true or false 2 points elements are grouped by properties. true fals…
True
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23 multiple answer 4 points select all of the following that are noble …
He. Helium, Ne. Neon, Ar. Argon, Kr. Krypton, Xe. Xenon
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fill in the blank 2 points mendeleev ordered elements on the periodic t…
Mendeleev: mass; Moseley: number of protons (atomic number)
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fill in the blank 4 points what is the atomic symbol for silver? type y…
Ag
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abund ice of isotopes chem w c.ksheet 4 - 3 the atomic mass for each el…
2. 63.5471 amu 3. 27.989 amu 4. 69.776 amu 6. 207.2179 amu
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2. oxygen (o), sulfur (s), and selenium (se) are nonmetals. which one i…
Oxygen (O), Sulfur (S), and Selenium (Se) belong to Group 16. They are not in the same period. Oxygen is the most reactive.
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20 multiple choice 4 points define a period. diagonal on the periodic t…
From Left to Right (Same as Energy Levels)
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19 multiple choice 4 points cu, ag, and au are in what group #? 12 2 11…
C. 11
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17 fill in the blank 4 points what is the symbol of the last element in…
Kr
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nonmetals (reactivity trends) 1. arrange these nonmetals in order of mo…
1. Order of reactivity from most to least reactive: Fluorine (F) > Chlorine (Cl) > Bromine (Br) > Iodine (I). They are in the same group (Group 17, halogens). Fluorine reacts more…
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16 multiple choice 4 points define a family. from left to right (same a…
Same properties (same as the Group #) (Columns)
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087213—module 9 lhumanisme 3. nomme deux (2) œuvres importantes quil a …
3. Exemples : "La Joconde", "La Nascita di Venere" 4. A) La Renaissance B) 1. Peinture 2. Sculpture 3. Architecture 4. Littérature 5. a) 1. Enluminure : Peinture sur parchemin ave…
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nonmetals (reactivity trends) 1. arrange these nonmetals in order of mo…
1. F > Cl > Br > I 2. Oxygen, sulfur, and selenium are in Group 16. They are not in the same period. Oxygen is the most reactive among them. Fluorine reacts more strongly than iod…
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atomic mass elements come in a variety of isotopes, meaning they are ma…
1. $126.46$ 2. $197.5$ 3. $55.7$ 4. $1.012$ 5. $14.03$ 6. $12.04$
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although the percent yield should always be maximized, fairly low yield…
| Trial | Limiting Reagent | Theoretical Yield of Gypsum (g) | Experimental Yield of Gypsum (g) | Percent Yield of Gypsum | Amount of Excess Reagent Left (g) | |---|---|---|---|--…
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2. potassium, magnesium, and iron are metals. which one would react mos…
1. Potassium would react most violently with water because it is highly reactive due to its low ionization energy and single outer - shell electron. 2. Zinc and copper are in the …
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answer the following questions about the reactivity of metals and nonme…
Potassium (K) > Sodium (Na) > Calcium (Ca) > Aluminium (Al)
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which of the following carbonyls have a stretching frequency around 171…
The second structure (the cyclic ketone)
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what is the stretching frequency (in cm^-1) of the following carbonyl? …
1775
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metals (reactivity trends) 1. arrange these metals in order of most rea…
Potassium (K), Sodium (Na), Calcium (Ca), Aluminium (Al)
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answer the following questions about the reactivity of metals and nonme…
Potassium (K) > Sodium (Na) > Calcium (Ca) > Aluminum (Al)
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which of the following carbonyls have a stretching frequency around 168…
None of the given simple carbonyls (ketone, aldehyde, acyl - chloride) without conjugation typically have a stretching frequency around 1685 cm⁻¹. So the answer is none of these.
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which of the following carbonyls have a stretching frequency around 174…
The second structure (cyclopentanone)
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properties of water which of the following properties of water allows i…
A. Polarity
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names and formulas worksheet 1. write the formulas for the following co…
1. (h) $NiCl_{2}$ (i) $Mg_{3}N_{2}$ (j) $Al_{2}S_{3}$ (k) $CuBr$ (l) $SnI_{2}$ (m) $FeCl_{3}$ (n) $Ca_{3}P_{2}$ (o) $PbO$ (p) $PbF_{4}$ (q) $SnBr_{4}$ (r) $CuS$ (s) $FeO$ (t) $Ca_…
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question 1 of 20 read this passage: the politicians calling for stricte…
A. The author is biased against a law because it would have a financial effect on his business.
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question 15 what is the stretching frequency (in cm⁻¹) of the following…
A. 1685
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what is the stretching frequency (in cm⁻¹) of the following carbonyl? o…
1800
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question 13 what stretching frequencies (in cm⁻¹) are present in the st…
1640
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what is the stretching frequency (in cm⁻¹) of the following carbonyl? 1…
1765
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what is the stretching frequency (in cm^-1) of the following carbonyl? …
1765
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which of the following carbonyls have a stretching frequency around 171…
The second structure (the cyclic ketone)
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15. what evidence convinced j. j. thomson that an atom consists of more…
The overall electrical neutrality of atoms. Atoms are neutral, but electrons are negatively charged, so there must be a positively - charged component in the atom. ### 16.
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what is the stretching frequency (in cm⁻¹) of the following carbonyl? n…
1655
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what should you add to your ecocolumn if you want to test the effects o…
inorganic fertilizer
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which of the following carbonyls have a stretching frequency around 174…
The carbonyl with a stretching frequency around 1745 cm⁻¹ is the aldehyde (the second - shown structure). So the answer is the second - shown structure.
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using the table, what is the mass number for boron? * (0.5 points)
10
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3- the directions for a laboratory activity call for 50 milliliters (ml…
Set the extra 5 ml aside in a labeled beaker and ask the teacher for advice.
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using the table, how many neutrons does argon have? * (0.5 points) elem…
22
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using the table, what is the number of electrons in the calcium atom? *…
20
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which of the structures have a major peak between 1700 and 3000 cm⁻¹? (…
The first structure (alkyne), the fourth structure (ester)
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using the table, what is the number of electrons in the aluminium ion? …
10
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16 an isotope of xenon has an atomic number of 54 and contains 77 neutr…
131
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15 how many protons are in this magnesium ion? * (0.5 points) enter you…
12
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14 how many neutrons are in this magnesium ion? * (0.5 points) enter yo…
10
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12 how many neutrons are in the uranium - 235 isotope? * (0.5 points) e…
12. 143 13. 10
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11 how many neutrons are in this isotope of carbon? * (0.5 points) ente…
7
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what is the stretching frequency (in cm^-1) of the following carbonyl? …
D. 1715
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10 how many electrons are in this ion? * (0.5 points) enter your answer
18
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which is a nonchemical method for cleaning a floor? using a broom and d…
using a broom and dustpan
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7 how many protons are in an atom of radon? * (0.5 points) enter your a…
7. 86 8. Dysprosium 9. Silicon
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6 what does the left superscript in the following notation represent? *…
The mass number
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the passage below describes an experiment. sophie had medicine tablets …
Do whole tablets fizz for a longer period of time than crushed tablets?
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substance,element 1 symbol; metal/nonmetal,element 2 symbol; metal/nonm…
| Substance | Element 1 Symbol; Metal/Nonmetal | Element 2 Symbol; Metal/Nonmetal | Ionic/Covalent | Chemical Name | |---|---|---|---|---| | $P_3O_6$ | $P$; Nonmetal | $O$; Nonmet…
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use prior knowledge look for clues double check your work to ensure acc…
Similarity: Both have a central - atom bonded to other atoms. Difference: The atoms in the two models have different colors (possibly representing different elements).
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which statement best describes the rhyme scheme of a thought on the ine…
Without the poem text, we cannot accurately determine the answer. But if we were to choose based on common rhyme - scheme knowledge and the options given, more information about t…
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the rhyme pattern that occurs at the ends of lines in poetry is called …
D. a rhyme scheme
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what are the characteristics of fixed poetry? select three options. a r…
a regular rhyme scheme, lines of equal length, a set number of lines
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question 5 what stretching frequencies (in cm⁻¹) are present in the str…
3300
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5 what does the subscript in the following notation represent? * (0.5 p…
The number of protons
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which of the following is correct about an atoms atomic number? * (0.5 …
The atomic number is equal to the number of protons in an atom The mass number is the number of protons plus the number of neutrons
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which of the structures have a major peak between 1700 and 3000 cm⁻¹? (…
The first structure (cyclohexyl - aldehyde) has a major peak between 1700 and 3000 $cm^{-1}$ due to the $C=O$ and $C - H$ stretching vibrations. So the answer is the first - struc…
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how do isotopes of a given element differ? * (0.5 points) they have dif…
1. They have different numbers of neutrons 2. They always have the same number of protons
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what is the stretching frequency (in cm⁻¹) of the following carbonyl? o…
1685
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structured input: what i did versus what i do nombre jayden olivares yo…
| Last year | This year | Statement | True for you | | ---- | ---- | ---- | ---- | | X | | Organicé mi mochila cada mañana. | | | | X | Hago metas y un plan para lograrlas. | √ | …
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oil is a fossil fuel used to run cars, heat up homes, and produce elect…
air, water, organisms in water
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evaluate: answer the question below. identify one process in the diagra…
One process that happens quickly: Burning of forests and organic debris. One process that happens slowly: Formation of coal.
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calculate the percent composition by mass of each element in al(oh)₃. u…
% Al = 34.6% % O = 61.5% % H = 3.88%
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question 1 0.25 / 0.5 pts which of the following carbonyls have a stret…
All of the given carbonyl structures (the three structures shown, not "none of these")
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the indicator thymol blue has two color transitions as indicated in the…
pH 1: A. red pH 2: A. yellow pH 6: C. yellow pH 10: B. blue
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question 20 what stretching frequencies (in cm⁻¹) are present in the st…
2250
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question 19 0.5 pts which of the following carbonyls have a stretching …
The fourth structure (ketone)
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what stretching frequencies (in cm⁻¹) are present in the structure belo…
C. 1715
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question 17 what is the stretching frequency (in cm^-1) of the followin…
1745
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what stretching frequencies (in cm⁻¹) are present in the structure belo…
1800
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which of the structures have a major peak above 3000 cm⁻¹? (select all …
The second structure (the benzoyl - benzene)
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which refers to the amount of heat required to change the temperature o…
Specific heat
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which of the following carbonyls have a stretching frequency around 171…
none of these
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the passage below describes an experiment. jackson put a two - inch ste…
Do steel nails take fewer days to rust in water than in vinegar?