Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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20 multiple choice 2 points provide the name of the compound below. sec…
A. sec - butylcyclohexane
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1) how many valence electrons are in group 2 elements? 1 2 4 8 2) how m…
1) B. 2 2) B. 7
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19 true or false 2 points conformations are different arrangements of t…
True
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5) which of the following elements has the largest atomic radius? 1 poi…
Fr
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which line - angle formula corresponds to the chair conformation shown …
A. II
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3) why does he have a smaller atomic radius than h? h has more hydrogen…
3. He has 2 positively charged protons in the nucleus pulling the negatively charged electrons closer. 4. F
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17 multiple choice 2 points name the alkane shown: 5 - methyl - 2,2 - d…
C. 5 - ethyl - 2,2 - dimethyloctane
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1) which of the following elements has the largest atomic radius? li be…
1) C. Na 2) B. Cd
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16 multiple choice 2 points provide an acceptable name for the alkane s…
A. 3 - ethyl - 5 - methyl - 7 - propylnonane
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4 what line of thinking rejected alchemy? chemicals are basic building …
Chemicals are basic building blocks.
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true or false 2 points the appropriate iupac name of the compound below…
False
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arrange the following newman projections of butane in order of energy. …
III<I<IV<II
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1) how many grams of copper(ii) sulfate pentahydrate (cuso₄·5 h₂o) are …
$2.75$
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13 multiple choice 2 points provide an acceptable name for the alkane s…
D. hexane
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12 multiple choice 2 points provide an acceptable name for (ch₃ch₂ch₂)₃…
C. 2,2 - dipropylheptane
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what is the major constituent of natural gas? propane ethane methane bu…
C. methane
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10 multiple choice 2 points which of the following condensed formulas r…
A. CH₃CH₂CH₂OCH₂N(CH₂CH₃)₂
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multiple choice 2 points the energy barrier for carbon - carbon bond ro…
B. torsion strain
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multiple choice 2 points a branched alkane has ______ boiling point rel…
D. a lower; weaker
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7 multiple choice 2 points which of the following describes the compoun…
C. bridged bicyclic
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multiple choice 2 points in the lowest energy conformation of the compo…
3
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5 multiple choice 2 points which has the greatest molar heat of combust…
cycloheptane
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how many carbons do the primary alkane constituents of gasoline contain…
C₅ - C₈
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multiple choice 2 points triacontane is an unbranched alkane that conta…
A. 62
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2 multiple choice 2 points how many secondary (2°) carbons are found in…
3
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the name of the structure below is 4 - isobutylheptane: true false
False
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heat is a form of ______ energy, because it reflects the random motion …
C. kinetic
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the process of influencing chemical bonds to lower the activation energ…
D. catalysis
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which of the following describe how energy is used in chemical reaction…
All of the above statements can describe how energy is used in chemical reactions. However, if we must choose one, the most comprehensive and accurate one among the given options …
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fill in the blank question heat is a measure of the random of molecules…
kinetic energy
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any agent that speeds up the rate of a chemical reaction without being …
catalyst
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fill in the blank question stored in the chemical bonds of a molecule c…
Chemical energy
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what are the independent and dependent variables in this experiment? pr…
Independent variable: Mangrove Tree Height Dependent variable: Proportion Soil Organic Carbon
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heat is a form of ______ energy, because it reflects the random motion …
C. kinetic
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multiple choice question which of the following describe how energy is …
Energy stored in certain chemical bonds is transformed into kinetic energy which breaks those bonds (as atoms move quickly apart); Energy stored in certain chemical bonds can be u…
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13. normal body temperature is 37.0 °c. what is the corresponding fahre…
$98.6^{\circ}F$ ### 14.
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question 20 1 pts which of the following molecules has hydrogen bonding…
B. None, all of the choices exhibit dispersion forces
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iron express your answer in complete form, in order of increasing orbit…
$1s^22s^22p^63s^23p^64s^23d^6$
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question 51 points 3 which of the following statements is true? i. the …
I and II
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which intermolecular forces are present for a molecule with the formula…
For $NH_3$: dispersion forces, hydrogen bonding, dipole - dipole forces For $SO_2$: dipole - dipole forces, dispersion forces
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which intermolecular forces are present for a molecule with the formula…
For $NF_3$: - dipole - dipole forces - dispersion forces For $BF_3$: - dispersion forces
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choose the substance with the lowest boiling point. o h₂o₂ o cf₂h₂ o nb…
First question: $\mathrm{F_2}$ Second question: The straight - chain alkane with 5 carbon atoms (the second structure in the second question)
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choose the substance with the lowest boiling point. ○ h₂o₂ ○ cf₂h₂ ○ nb…
F₂
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arsenic express your answer in complete form, in order of increasing or…
1s^22s^22p^63s^23p^64s^23d^104p^3
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place the following substances in order of increasing boiling point. ch…
D. $CH_3CH_2CH_3 < CH_3OCH_3 < CH_3CH_2OH$
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how many molecules are in 2.5 mol of nacl? 1.5 molecules 1.5 x 10^24 mo…
B. $1.5\times 10^{24}$ molecules
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place the following substances in order of increasing boiling point. ch…
For the first question: $CH_3CH_2CH_3<CH_3OCH_3<CH_3CH_2OH$ For the second question: $F_2$
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3. ocean currents ch.- 16 state government ✦ fill in the blanks. 1. ind…
1. 28, 8 2. Union Government/Central Government 3. 25 4. Question - Hour 5. Governor For one - word answers: 1. Member of Legislative Assembly 2. 30 3. 6 years 4. Ahmedabad 5. Pow…
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2.40 g of an explosive, j, contains 0.473 g of nitrogen. j also contain…
B. $C_{2}HNO_{2}$
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12 report sheet · basic laboratory techniques 8. why should you never d…
- 8. A hot object can damage weighing equipment and give inaccurate mass readings due to air - current and thermal expansion effects. - 9. To ensure accurate temperature and volum…
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question 11 1 pts place the following substances in order of increasing…
Question 11: $CH_3CH_2CH_3<CH_3OCH_3<CH_3CH_2OH$ Question 12: $F_2$
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select all of the following choices that are potential causes for extre…
- mild stress - certain diseases - chemical imbalance - drug use
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the melting point and boiling points of the halogens ____________ as on…
First question: D. increases Second question: D. Ne < O₂ < Cl₂
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place the following compounds in order of increasing strength of interm…
$CH_4 < CH_3CH_3 < CH_3Cl < CH_3OH$
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place the following compounds in order of increasing strength of interm…
$F_2<CO_2 < NH_3$
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question 5 1 pts identify the strongest type of intermolecular forces. …
Question 5: hydrogen bonding Question 6: $CH_3OH$
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question 3 what is the strongest type of intermolecular force present i…
Question 3: C. hydrogen bonding Question 4: C. dispersion forces
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question 1 1 pts what is the strongest intermolecular force present in …
Question 1: dispersion Question 2: dipole - dipole
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a particularly strong type of dipole - dipole attraction called ____ is…
Question 1: A. hydrogen bonding Question 2: A. high boiling point
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a(n)__________ attraction is the electrostatic force between the partia…
1. A. dipole - dipole 2. D. polar, dipole - dipole
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a molecule that is spherical and compact will exhibit ______ dispersion…
For the first question: less For the second question: less surface area
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a large molecule or atom that has a charge cloud that is easily distort…
1. D. polarizable 2. B. shapes
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forces signifies all of the various type of intermolecular forces that …
1. Van der Waals 2. instantaneous dipole, induced dipole
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forces are the forces that act between two or more molecules while forc…
Question 3: C. Intermolecular, intramolecular Question 4: A. True
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the phase of a given sample (solid, liquid, gas) at a particular temper…
Question 1: intermolecular forces, kinetic energies Question 2: hold particles together, push particles apart
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determine the electron geometry (eg) and molecular geometry (mg) of asc…
For $AsCl_3$: eg = tetrahedral, mg = trigonal pyramidal For $SCl_2$: eg = tetrahedral, mg = bent
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which of the following determine(s) the severity of a pollutant? chemic…
All of the choices
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what is the molecular geometry of hccl3? o trigonal pyramidal o bent o …
First question: C. tetrahedral Second question: B. eg=trigonal planar, mg=trigonal planar
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if a 359 ml glass of water (1 g/ml) can contains 0.962 moles of sodium …
$102.75$
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which of the following represents the molecular geometry for a molecule…
Trigonal Planar (the last option in the multiple - choice list)
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what is the molecular geometry for the pbr3 molecule? bent tetrahedral …
trigonal pyramidal
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which of the following is the correct lewis dot structure for a molecul…
First question: $H - \ddot{S}-C\equiv N$ Second question: tetrahedral
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which of the following is the correct lewis dot structure for a molecul…
The first option (the structure with the correct connectivity of $H - C(CH_3)-C(=O)-O - H$ and proper lone - pair distribution on oxygen atoms) is the correct Lewis - dot structur…
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which of the following is the correct lewis dot structure for a molecul…
The first option (the structure with a central carbon double - bonded to one oxygen and single - bonded to two other oxygens, all atoms with octets and the whole structure in brac…
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3. what is the number of significant figures in each of the following m…
(a) 3 (b) 3 (c) 4 (d) 3
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which of the following is the correct lewis dot structure for a molecul…
The third option (the one with a double - bond between C and O and single bonds between C and H, and two lone pairs on O) is the correct Lewis dot structure for $H_2CO$.
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how many valence electrons are available to create a lewis dot structur…
Question 13: C. 24 Question 14: D. 8
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18. in chemistry you learned that covalent bonds are one type of intram…
a. N - H and C=O (covalent bonds) b. The dotted line between O of a water - like molecule and H of N - H (hydrogen bond)
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18. in chemistry you learned that covalent bonds are one type of intram…
a. Covalent bonds: N - H bonds within the nitrogen - containing molecule, O - H bonds within water molecules. b. Hydrogen bonds: The dotted lines connecting a hydrogen atom (from …
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what is a biosand filter? a concrete or plastic box that is filled with…
A. A concrete or plastic box that is filled with layers of sand and gravel
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which of the following is the correct lewis structure for chlorine? que…
For the first question: The correct Lewis structure for chlorine ($Cl_2$) is the one with a single bond between the two chlorine atoms and 3 lone - pairs on each chlorine atom (th…
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what is a biosand filter? a concrete or plastic box that is filled with…
A. A concrete or plastic box that is filled with layers of sand and gravel
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17. predict the approximate ph (ph = 7, ph > 7 or ph < 7) of fairly con…
Lactic acid: pH < 7 Amino acid: pH < 7 Dopamine: pH > 7 Lactose: pH = 7
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in general, main group nonmetals tend to share electrons so as to attai…
First question: C. 8 Second question: C. ionic, covalent
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the tendency of an atom to attain an electron configuration having eigh…
Question 1: D. octet rule Question 2: A. 8
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question 10. 106.5 g of hydrochloric acid react with an unknown amount …
49.8 g of ammonia reacted and the law of conservation of mass is observed because the sum of the masses of the reactants ($106.5$ g of $HCl$ and $49.8$ g of $NH_3$) is equal to th…
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which of the following represents the lewis symbol for nitrogen?
The Lewis - symbol with one pair of dots above the N and three single dots around the N (one on the left, one on the right, and one below) is the correct one. Without specific let…
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question 9. a 10.0 - g sample of magnesium reacts with oxygen to form 1…
6.6
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match the letter of the following electron configurations with the numb…
A. 7 B. 5 C. 6 D. 2 E. 8
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question 8. the law of conservation of mass states that mass is neither…
The missing words are: conserved; is equal to
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match the letter of the following electron configurations with the numb…
A. 7 B. 5 C. 6 D. 2 E. 8
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the law of conservation of states that mass is neither nor during a che…
The law of conservation of mass states that mass is neither created nor destroyed during a chemical reaction - it means the mass of the reactants equals the mass of the products.
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question 7. which of the following statements are true about physical a…
A. As heat is added to ice, it melts and becomes liquid water. This is an example of a physical change B. A chemical change forms new substances. C. A physical change alters the a…
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15. describe the functional group, called an amine group, that the basi…
15. The amine group in adrenaline has a nitrogen atom with a lone - pair of electrons. This lone - pair can accept a proton from water, making it basic. The basic molecules in Mod…
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15. describe the functional group, called an amine group, that the basi…
Adrenaline has a basic property because the amine group in it can accept a proton from water due to the presence of a lone pair of electrons on the nitrogen atom, which is in line…
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use diagrams a - c to answer questions # 23 & 24 23) record the volume …
23) A: 26.0 mL, B: 30.0 mL, C: 26.4 mL 24) 82.4 mL 25) Volume = 7.2 $cm^{3}$, $D\approx4.9\ g/cm^{3}$
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match the group number of the main group elements (or sequence number o…
| Group Number | Number of Valence Electrons | | ---- | ---- | | 1A | 1 | | 2A | 2 | | 3A | 3 | | 4A(14) | 4 | | 5A(15) | 5 | | 6A(16) | 6 | | 7A(17) | 7 | | 8A(18) | 8 |
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select the correct answer. which phrase best describes wave motion? a. …
A. movement of energy through space or a medium
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match the number of valence electrons present for each of the following…
Hydrogen: 1 Boron: 3 Carbon: 4 Nitrogen: 5 Phosphorous: 5 Oxygen: 6 Sulfur: 6 Fluorine: 7 Chlorine: 7
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question 6. which are physical and which are chemical changes? a) boil …
a) Physical change b) Chemical change c) Physical change d) Chemical change e) Physical change f) Chemical change g) Physical change h) Physical change i) Chemical change j) Chemi…