化学
化学反応、化学量論、分子構造、元素の性質。
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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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to rent a certain meeting room, a college charges a reservation fee of …
$t\leq7$
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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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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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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. 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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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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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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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…
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13. functional groups are key groups of atoms in biological molecules. …
13. The carboxyl functional group (-COOH) has a carbon - oxygen double - bond and a hydroxyl group on the same carbon, can ionize, and is polar. 14. An acid donates a proton. Lact…
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people take ______ to get adequate amounts of essential nutrients that …
A. dietary supplements
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the three dimensional structure of molecules is a consequence of the ar…
1. C. electrons 2. C. valence
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question 5. which of the following is not a chemical change? rusting of…
Converting water into steam
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homework 5 - 09/17/2025 question 4. which of the following is not a phy…
Gasoline burning
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when the central atom has one or more lone pairs, the molecular geometr…
1. A. trigonal pyramidal 2. E. linear
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electron - pair geometry are based on the number of regions of electron…
2 pair: linear 3 pair: trigonal planar 4 pair: tetrahedral
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question 3. classify each of the following as a physical or chemical ch…
a) Physical Change b) Chemical Change c) Chemical Change d) Physical Change e) Chemical Change f) Physical Change g) Chemical Change
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the procedure used in vsepr theory to determine the electron pair geome…
First question: Lewis structure Second question: electron density
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the wedge and dash notation is used to draw molecules from a three dime…
First question: plane of the page Second question: tetrahedral, trigonal pyramidal
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question 2 a chemical change is a change in which one or more substance…
One example could be rusting of iron.
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the electron - pair geometry and the molecular geometry will be differe…
1. C. lone pairs 2. E. tetrahedral
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1. make a claim about how soap affects hydrogen bonds between water mol…
1. Soap disrupts hydrogen bonds between water molecules. 2. Evidence: [Describe relevant data from the experiment, e.g., lower number of water droplets on penny with soap compared…
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electron - pair geometries describe all regions where electrons are loc…
Question 1: D. bonding pairs Question 2: D. molecular structure
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you should be able to answer the following questions before beginning t…
The volume of the liquid in mL is 3700 mL and in cm³ is 3700 cm³.
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in the vsepr theory model, basic electron - pair geometries arise when …
1. C. maximized 2. True
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question 3 the vsepr theory model only considers electron - pair attrac…
Question 3: B. repulsions Question 4: C. linear
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jennifer is buying a new pair of skates. there are 8 styles of skate to…
16
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the three - dimensional structure of molecules can be described in term…
1. B. distances, angles, arrangements 2. C. electron pairs
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24. a student measured the volume of a liquid to be 215.5 ml. the corre…
24. Approximately $4.87\%$ 25. Approximately $9.26\%$
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create an appropriately labeled bar graph to illustrate the sample mean…
1. Claim: Soap disrupts hydrogen bonds between water molecules. 2. Evidence: Differences in surface - tension related measurements (e.g., number of water drops on penny) between p…
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use the following figure to answer the question. a. 1 mole of the compo…
a. 60 grams. The molecule has 2 C (2×12 = 24 g), 4 H (4×1 = 4 g) and 2 O (2×16 = 32 g), and 24 + 4+32 = 60 g. b. The functional group is a carboxyl group (-COOH). The molecule is …
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11. in chemistry there is a saying \like dissolves like,\ which means t…
a. Water is polar. Water has a bent molecular shape and a significant electronegativity difference between oxygen and hydrogen atoms, creating a dipole moment. b. Oil is non - pol…
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10. consider the polar molecules in model 2. a. in general, the presenc…
a. Electronegative elements like O, N, F. b. High electronegativity to create dipole moments. c. Yes, under certain conditions such as reaction with polar substances or change in …
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measuring volume 8. 9. 10. 11. what is the volume of the rock? 12. why …
20 mL
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ch. 3 - matter quiz started: sep 16 at 7:25pm quiz instructions questio…
calcium
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question 9 which of the following elements would be a good choice for e…
B. copper
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ch. 3 - matter quiz started: sep 16 at 7:25pm quiz instructions questio…
fluorine, helium
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question 7 which of the following set of substances are only compounds?…
CH₄, CO, HI
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question 6 which of the following are pure substances? select all that …
oxygen, carbon dioxide
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question 5 pure substances can be classified into what groups? select a…
elements compounds
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question 4 a chemical change results in a change in the composition of …
True
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question 3 which of the following is a chemical change? grass is cut by…
food is digested in your stomach
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question 2 which of the following are physical properties? select all t…
methanol boils at 148.5 F, Solid sulfur is yellow
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question 1 which of the following is a physical change? ○ a pencil is s…
a pencil is sharpened
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ch. 3 - compound names & formulas started: sep 16 at 7:12pm quiz instru…
sodium sulfide
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ch. 3 - compound names & formulas quiz started: sep 16 at 7:12pm quiz i…
D. iron (III) chloride
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question 12 what is the formula for strontium oxide? sro sr₂o₃ sr₂o sro₂
SrO
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question 10 what is the name of licl? lithide chlorine lithium (i) chlo…
lithium chloride
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ch. 3 - compound names & formulas quiz started: sep 16 at 7:12pm quiz i…
C. $MgCl_{2}$
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how many sig figs? determine the number of sig figs for each of the fol…
14) 3 15) 4 16) 3 17) 1 (assuming measured to the nearest kg) 18) 5 19) 5.49×10⁶ m 20) 31,950 cm² (or 3.195×10⁴ cm²) 21) 192.67 cm³ 22) 790 cm (or 7.9×10² cm) 23) 3 24) 5 (assumin…
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write the complete electron configuration for each of the following: pa…
Part A: 1s^22s^22p^3 Part B: 1s^22s^22p^63s^23p^4
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1. equilibrium & molecules . equilibrium = molecules are balanced on bo…
1. Molecules are balanced on both sides and keep moving both ways at equilibrium. 2. No, molecules do not stop moving at equilibrium.
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the image shows a representative sample of 50 atoms of a fictious eleme…
Le - 19: 40% Le - 17: 20% Le - 15: 40% Average atomic mass: 17.3933 u (There may be a small difference from the provided answer 17.566 due to possible counting or rounding differe…
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at the chemical level, ____ are the smallest units of matter. o organel…
C. atoms