化學
化學反應、化學計量、分子結構與元素性質。
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30 multiple choice 2 points species with unpaired electrons are called …
A. radicals
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29 multiple choice 2 points in the first propagation step of the free r…
E. A chlorine radical abstracts a hydrogen.
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directions: solve each of the following problems 7 - 12 as directed. sh…
$\mathbf{208.23\ g/mol}$ ### 8.
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28 multiple choice 2 points ____ is the study of reaction rates. termin…
D. kinetics
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27 multiple choice 2 points energy is ______ when bonds are formed and …
B. released; consumed; endothermic
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26 multiple choice 2 points what term describes the highest - energy st…
D. transition state
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6.) determine the number of atoms in each formula: al₂(so₄)₃ (3 points)…
Al: 2 S: 3 O: 12
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25 multiple choice 2 points which is a measure of the randomness of a s…
E. entropy
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provide the value of the standard enthalpy change (δh°) for the followi…
$\Delta H^{\circ}=18\ kJ/mol$
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3.) it is possible to convert moles to particles by (1 point) dividing …
3. multiplying by $6.02\times 10^{23}$ 4. False 5. False
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23 multiple choice 2 points the difference in energy between reactants …
B. activation energy
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directions: choose the answer that best completes each statement for nu…
1. C. mass of each element in the compound 2. D. Avogadro's number
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22 multiple choice 2 points if stronger bonds are formed and weaker bon…
C. exothermic
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21 multiple choice 2 points which of the following radicals is the most…
Quaternary radical
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20 multiple choice 2 points which of the following statements correctly…
The entropy term makes a greater contribution to $\Delta G^{\circ}$ at high temperatures.
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multiple choice 2 points the heat released or absorbed during a chemica…
A. Enthalpy
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consider the reaction diagram shown below. a. determine which step in t…
a. First step (A-->B) b. Proceed to form the product c. First step (A-->B)
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17 multiple choice 2 points if a reaction is exothermic, then _____. δs…
D. $\Delta H^{\circ}<0$
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multiple choice 2 points provide an energy profile diagram for an exoth…
The first diagram is correct.
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multiple choice 2 points ______ is the minimum kinetic energy reacting …
activation energy
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14 multiple choice 2 points for the reaction a + b → c + d, δg° = -5.00…
A. 4648
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13 multiple choice 2 points the dehydrogenation of ethane (ch₃ - ch₃) t…
D. $\Delta G^{\circ}= + 100\ kJ/mol$, The reaction is disfavored.
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12 multiple choice 2 points which of the following reactive intermediat…
A. methyl carbanion
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11 multiple choice 2 points when two carbenes collide, they immediately…
A. an alkene
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multiple choice 2 points. consider the equilibrium shown below. when on…
The K where X = CH(CH₃)₂ is greater.
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multiple choice 2 points which of the following reactive intermediates …
E. carbanions
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multiple choice 2 points which of the following is true for the initiat…
A. $\Delta H^{\circ}>0$ and $\Delta S^{\circ}>0$
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7 multiple choice 2 points which of the following is a propagation step…
C. $\cdot CHCl_2+Cl_2 ightarrow CHCl_3 + Cl\cdot$
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6 multiple choice 2 points rank the following carbocations in order of …
I > II > III
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estimate the difference between $delta h_{reaction}$ and $delta u_{reac…
$-4955$
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multiple choice 2 points consider the energy diagram given below: (1) h…
(1) There are two steps in the reaction. (2) The energy - minimum point between the two peaks represents the intermediate. (3) The step with the highest activation energy (the fir…
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4 multiple choice 2 points maximize disorder and minimize enthalpy. spo…
A. spontaneous reactions
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3 multiple choice 2 points which of the following best describes homoly…
The bond breaks evenly, resulting in two radicals.
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2 multiple choice 2 points which of the following species is not formed…
C. HCl, D. CH₃Cl
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answer all questions 1 multiple choice 2 points consider the three - st…
C. The reaction of A to B.
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determine the standard enthalpy change for each of the following reacti…
Reaction 1: $-939.2\text{ kJ}$ Reaction 2: $-1408.4\text{ kJ}$ Reaction 3: $7.3\text{ kJ}$
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constant - volume calorimeters are sometimes calibrated by running a co…
$4.65$
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5.1 orbital energies assuming the core electrons are 100% effective at …
4
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the higher the value of the quantum number l, the less that electrons i…
the more that electrons in that orbital are screened from the nuclear charge by electrons in smaller, more stable orbitals.
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which statement is an example of the law of conservation of energy? a s…
An automobile engine burns gasoline to converts its chemical energy to electrical energy. When a light - bulb is turned on, electrical energy is converted to light and heat.
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energy in reactions 3. the graphs below show the amount of energy prese…
3. First graph: Endothermic reaction; Second graph: Exothermic reaction 4. Energy 5. The minimum amount of energy that reactant molecules must have to undergo a chemical reaction …
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2.4 chemical reactions and enzymes lesson objectives - explain how chem…
1. A chemical reaction is a process that changes one set of chemicals into another set of chemicals. 2. | Chemicals | Definition | |--|--| | Reactants | The elements or compounds …
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consider a hypothetical compound formed between element x (electronegat…
1. B. Ionic bond 2. B. A network of strong covalent bonds between carbon atoms
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which of the following molecules contains polar covalent bonds due to a…
1. Water ($H_2O$) 2. Delocalized electrons can move freely throughout the metal lattice, carrying an electrical charge.
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what is the primary factor that determines whether a bond between two a…
1. The electronegativity difference between the atoms 2. Ionic bond
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which property is characteristic of substances with metallic bonding du…
1. Malleability and ductility 2. Brittleness and high melting points
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which of the following elements is likely to exhibit metallic bonding i…
1. Potassium (K) 2. Covalent bond 3. It is likely to form ionic bonds by losing electrons to another atom.
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in which type of bonding are electrons delocalized and shared among a \…
1. B. Metallic bond 2. A. Sodium chloride (NaCl)
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which of the following fundamental forces is primarily responsible for …
1. Electromagnetic force 2. Ionic bond
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highlight the incorrect statement regarding equilibrium. (select at lea…
1. Chemical reactions proceed in one direction only. 3. Equilibrium is the highest state of free energy that can be reached. 4. Energy is added to a system to prevent equilibrium …
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my contribution to the harlem renaissance include: 5 points as an entre…
The person made business - related contributions to the Harlem Renaissance by inspiring business growth and achieving financial success in the hair - care product industry.
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directions: read the shore text about the carbon atom and why it is imp…
Discipline: Natural Science Sub - field: Chemistry (Note: The task is about developing a model of an atom and understanding atomic structure which falls under the sub - field of C…
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directions: read the shore text about the carbon atom and why it is imp…
Model of carbon atom made with materials and paragraph written explaining importance of carbon and how atom models help scientists.
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a sample of an unknown pure substance x is analyzed and found to contai…
A. mixture B. mixture C. mixture
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the chemical formula for calcium bicarbonate is: ca(hco₃)₂. how many ca…
2
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a sample of an unknown pure substance x is analyzed and found to contai…
A. mixture B. mixture C. mixture
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question 18 what is the term for a blood clot that travels in the blood…
A. Embolism
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question 11 match the medical term with its definition: prompts 1 aneur…
1. Weakness in the wall of a blood vessel. 2. Insufficient blood flow to a tissue. 3. Formation of a blood clot inside a blood vessel. 4. Disease of the heart muscle.
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price of organic cauliflower based on this graph, two pounds of caulifl…
Two pounds of cauliflower will cost $3.00 and five pounds of cauliflower will cost $7.50.
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price of organic cauliflower based on this graph, two pounds of caulifl…
Two pounds of cauliflower will cost $4 and five pounds of cauliflower will cost $10.
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25 of 28 questions chapter exams content page 4 of 28 question 4 which …
C. Hyperlipidemia
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module test 12. identify the term that refers to complete heart block. …
C. Third - degree heart block
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complete the following table: some polyatomic ions name peroxide anion …
Peroxide anion: $O_2^{2 -}$ Acetate anion: $CH_3COO^-$ Carbonate anion: $CO_3^{2 -}$ Hydronium cation: $H_3O^+$
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which subatomic particle has a positive charge and resides in the nucle…
B. proton
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2 one of 118 unique substances that cannot be broken down into smaller …
2. Element 3. Hydrogen - bond 4. Hydrophilic 5. Hydrophobic
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6 an atom or compound that does not contain equal numbers of protons an…
6. Ion 7. Ionic bond 8. Isotope 9. Mass number
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question 8 you love sweet tea. you create a solution of simply syrup to…
C. solvent; solute
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quiz - gas laws questions 13. a canister filled with 3.75g of argon gas…
548
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select the burette clamp.
The second image (the stand which is associated with the burette clamp setup)
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select the evaporating dish.
The third option (the bowl - like container with a spout)
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quiz - gas laws name: ebtesam questions use the following information t…
Avogadro's Law
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select the analytical balance.
The first option (the instrument with an enclosed chamber)
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use the following information to answer the next question. the unbalanc…
69L
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select the bunsen burner.
The third image.
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quiz - gas laws name: ebtesam questions use the following information t…
81
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quiz - gas laws name: ebtasam questions use the following information t…
81
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select the volumetric pipette.
The third image.
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part 3 of 3 iron(ii) sulfate (containing the fe²⁺ ion and so₄²⁻ ion) na…
Name: Iron(II) sulfate Empirical formula: $\text{FeSO}_{4}$
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part 3 of 3 iron(ii) sulfate (containing the fe²⁺ ion and so₄²⁻ ion) na…
$FeSO_{4}$
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quiz - gas laws name: ebtesam questions 5. a co₂ cylinder with fixed vo…
$1.26$
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select the graduated pipette.
The first image (the long, narrow tube with markings)
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give the number of protons and electrons in the ion n^{3 - }. protons: …
Protons: 7 Electrons: 10
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use the following information to answer the next question. the graph be…
Gay - Lussac's Law
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select the volumetric flask.
The flask on the right labeled 100 mL.
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there are only two naturally - occurring stable isotopes of carbon, the…
The natural abundance of \(^{12}C\) is \(98.9\%\) and of \(^{13}C\) is \(1.1\%\)
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a balloon filled with neon gas has a volume of 165ml at a temperature o…
$66.3$
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select the burette. submit
The second option (the tube with the stop - cock)
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select the test tube. submit
The second one (the slender, cylindrical glass object)
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a robot spacecraft returned samples from the planetesimal 98765 aleks, …
100.82
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the half - life of palladium - 100 is 4 days. after 24 days a sample of…
Initial mass: 128 mg Mass after 5 weeks: 0.297 mg
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12) choose the best answer. ____ is friction that builds up while an ob…
C. Sliding friction
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how many valence electrons does nitrogen have? 8 4 5 1 2 question 8 how…
For the question about nitrogen: C. 5 For the question about hydrogen: B. 1
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question 4 which of the following is an element? sucrose sodium chlorid…
Question 4: C. hydrogen gas Question 5: A. Sodium
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question 2 1 pts an atom that has gained or lost one or more electrons …
Question 2: C. ion Question 3: B. element
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this basics quiz should be straightforward if you have watched the basi…
B. 1
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what happens when the kinetic energy of molecules increases so much tha…
C. Matter changes to a plasma state.
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the repeating subunits that are responsible for the shape of a crystal …
unit cells.
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substance x has a fixed volume, and the attraction between its particle…
Substance X is a solid, and substance Y is a plasma.
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for each molecular shape, identify the number of bonds around the centr…
| Molecular Geometry | Number of Bonds Around the Central Atom | Number of Lone Pairs Around the Central Atom | | ---- | ---- | ---- | | Linear | 2 | 0 | | Trigonal planar | 3 | 0…
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molecular modeling and lewis structures evaluation lewis structures eva…
octahedral