化学
化学反应、化学计量、分子结构与元素性质。
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12) ____ no_{2} + ____ h_{2}o \to ____ nh_{3} + ____ o_{2}
\(4NO_2+6H_2O ightarrow4NH_3 + 7O_2\)
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11) ____ co_{2} + ____ h_{2}o \to ____ c_{2}h_{6} + ____ o_{2}
\(4CO_2+6H_2O ightarrow2C_2H_6 + 7O_2\)
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drug resistance occurs against antibiotics and not against synthetic ch…
diseases present at birth
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the ideal chemical disinfectant should be: toxic to tissues activated o…
- First question: Stable, noncorrosive, and broad - spectrum. - Second question: Antiseptics are for living tissue.
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question 32 (1 point) chemotherapy refers to: the use of chemicals to t…
Question 32: The use of chemicals to treat disease Question 33: Are derived from microorganisms
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below what ph value is food considered too acidic for bacterial growth?…
2 pH
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11. match the vocabulary word to its definition 1. a molecule a. smalle…
1. c. A molecule forms when two or more atoms chemically combine. 2. d. A chemical reaction is a process that leads to the transformation of one set of chemical substances to anot…
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substances giving of a smell, or ___, while being combined is also an i…
odor
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0.543 71 which of the following is true? a/we know combining substances…
Statement \(a\) (We know combining Substances A and B resulted in a chemical reaction because gas was formed) is True.
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6. an uneffected change in ___ is a sign that chemical reactions may ha…
temperature
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6. an unexpected change in ___ is a sign that chemical reactions may ha…
temperature, light, odor, color, precipitate, gas
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4. in a chemical process, atoms that make up a substance are regrouped …
molecules
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3. rust forming on a piece of iron is an example of which of the follow…
C. a chemical change because oxygen atoms from the atmosphere bonded with the iron atoms.
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2. which of the following is the best description of the results of a c…
B. A new substance with different properties is formed.
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tiny samples of aqueous solutions are sketched below, as if under a mic…
First sample: no; Second sample: yes; Third sample: no; Fourth sample: yes.
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hydrogen and fluorine react to form hydrogen fluoride, like this: h₂(g)…
| perturbation | change in composition | shift in equilibrium | |---|---|---| | The temperature is lowered | The pressure of \(F_2\) will decrease | to the right | | The temperatu…
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methane and water react to form hydrogen and carbon monoxide, like this…
| perturbation | change in composition | shift in equilibrium | |---|---|---| | The temperature is raised | The pressure of \(CH_{4}\) will decrease | to the right | | The tempera…
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methane and chlorine react to form chloroform and hydrogen chloride, li…
- When the temperature is lowered: The pressure of \(CHCl_{3}\) will increase and the equilibrium shifts to the right. - When the temperature is raised: The pressure of \(CH_{4}\)…
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nitrogen and oxygen react to form nitrogen monoxide, like this: $$ math…
| perturbation | change in composition | shift in equilibrium | |---|---|---| | The temperature is raised | increase | to the right | | The temperature is lowered | increase | to …
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carbon dioxide and water react to form methane and oxygen, like this: c…
- When the temperature is raised: The pressure of \(O_{2}\) will increase and the equilibrium shifts to the right. - When the temperature is lowered: The pressure of \(H_{2}O\) wi…
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tiny samples of aqueous solutions are sketched below, as if under a mic…
For the first reaction: no For the second reaction: no For the third reaction: no For the fourth reaction: no
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the two substances in each sample can interconvert. that is, each kind …
First case: yes; Second case: yes; Third case: no; Fourth case: no
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chemistry i mass-mole-molecules conversion handout name date convert ea…
5. \(25.5\space g\) 6. \(63.7\space g\)
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an organic tea manufacturing company hires a firm called storymoulders …
d. public relations
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question 39 (2 points) how many electrons are there in the highest occu…
5
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question 38 (2 points) how many electrons are in the highest occupied e…
\(1\)
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question 37 (2 points) how many electrons are in the highest occupied e…
2
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question 36 (2 points) how many electrons are in the highest occupied e…
7
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question 11 complete mark 1.00 out of 1.00 flag question pp is short fo…
True
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question 33 (1 point) compared with the electronegativities of the elem…
- **Question 33**: a. higher - **Question 34**: a. ionization energy increases. - **Question 35**: c. aluminum
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question 30 (1 point) the metals in groups 1a, 2a, and 3a o a all form …
b. lose electrons when they form ions # Question 31
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question 27 (1 point) which of the following elements is a transition m…
C. copper # Question 28
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question 24 (1 point) in which of the following sets is the symbol of t…
B. In, 49 protons, 49 electrons ### Question 25
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question 21 (1 point) each period in the periodic table corresponds to …
- Question 21: B. principal energy level - Question 22: D. number - Question 23: D. nonmetals
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question 18 (1 point) as changes in energy levels of electrons increase…
- Question 18: a. increase - Question 19: b. Group A elements - Question 20: a. magnesium
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question 12 (1 point) the letter \p\ in the symbol $4 p^{3}$ indicates …
b. orbital shape # Question 13
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question 9 (1 point) what is the maximum number of electrons in the sec…
a. 8 # Question 10
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30 multiple choice 2 points which of the following intermediates is tho…
C. carbocation
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question 6 (1 point) what is the shape of the 3p atomic orbital? o a du…
A. dumbbell # Question 7
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multiple choice 2 points the reaction of an alkene with water in the pr…
Hydration
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question 5 (1 point) how does the energy of an electron change when the…
C. It decreases.
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28 multiple choice 2 points when an alkene undergoes polymerization, th…
B. A polymer
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match each item with the correct statement below. column a 1. horizonta…
1. c. period 2. i. group 3. h. periodic law 4. d. metal 5. f. transition metal 6. a. atomic radius 7. b. electrons 8. g. electronegativity 9. e. ionization energy
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27 multiple choice 2 points which of the following additions to alkenes…
addition of \(Br_2\)
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question 1 (5 points) match each item with the correct statement below.…
1. d. atomic orbital 2. e. ground state 3. b. aufbau principle 4. c. electron configuration 5. a. Pauli exclusion principle
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25 multiple choice 2 points addition of br₂ to (e)-hex-3-ene produces _…
B. a meso dibromide
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24 multiple choice 2 points during the reaction of an alkene with a hal…
C. A halohydrin
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23 multiple choice 2 points which catalyst is typically used in the hyd…
C. Pd or Pt
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22 multiple choice 2 points which of the following is the best reaction…
B. oxymercuration - demercuration
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21 multiple choice 2 points what is the product when ethene reacts with…
1,2-dibromoethane
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provide the reagents necessary to complete the following transformation…
1. \(OsO_4\) 2. \(H_2O_2\)
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identify the element that is most likely to produce the pes graph displ…
Bromine (\(Br\))
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17 multiple choice 2 points treatment of cyclopentene with peroxybenzoi…
yields a meso epoxide
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a chemist adds 0.30 l of a 0.46 m barium chlorate (ba(clo₃)₂) solution …
\(42.0\space g\)
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16 multiple answer 2 points which of the following reactions produce di…
B. Reaction with osmium tetroxide (\(OsO_4\)); C. Oxidation with cold dilute \(KMnO_4\)
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provide the reagents necessary to complete the following transformation…
D. \(OsO_4, H_2O_2\)
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14 multiple choice 2 points ______ is the use of an optically active re…
B. Asymmetric induction
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a chemist prepares a solution of sodium thiosulfate (na₂s₂o₃) by measur…
\(2.81\ mol/L\)
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a chemist adds 1.05 l of a 9.0 × 10⁻⁴ m magnesium fluoride (mgf₂) solut…
$9.5\times 10^{-4}$
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a chemist prepares a solution of aluminum chloride (alcl₃) by measuring…
\( 1.3\times 10^{-3}\space M\)
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12 multiple choice 2 points hbr can be added to an alkene in the presen…
radical chain initiator
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how many milliliters of a 10.0 m sucrose solution would be needed to pr…
\(58.2\space mL\)
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11 multiple answer 2 points which of the following reactions can produc…
A. Hydroboration - oxidation, B. Acid - catalyzed hydration, D. Oxymercuration - demercuration
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treatment of 2 - methylpropene with which of the following reaction con…
A. \(BH_3\)-THF, followed by alkaline \(H_2O_2\); D. dry gaseous \(HBr\) with peroxides present
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8 multiple choice 2 points when propene reacts with hbr in the presence…
C. 1 - bromopropane
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question 36 (2 points) how many electrons are in the highest occupied e…
Question 36: 7 Question 37: 2 Question 38: 1 Question 39: 5
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question 35 (1 point) of the following elements, which one has the smal…
a. aluminum
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question 32 (1 point) which of the following elements has the smallest …
c. potassium # Question 33
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5 multiple choice 2 points when an alkene is subjected to treatment wit…
C. ether
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question 29 (1 point) of the elements fe, hg, u, and te, which is a rep…
C. Te # Question 30
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multiple choice 2 points how many moles of bh₃ need to be added to comp…
1/3 mole of \( BH_3 \)
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question 26 (1 point) elements that are characterized by the filling of…
- Question 26: a. groups 3A through 8A - Question 27: a. copper - Question 28: c. The highest occupied \(s\) and \(p\) sublevels are partially filled.
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3 multiple answer 2 points ozonolysis of an alkene produces: ketones ca…
A. Ketones, C. aldehydes
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1. ch₃co₃h 2. h⁺, h₂o 1. bh₃·thf 2. h₂o₂, ho⁻ oso₄ ch₃co₃h
1. \( \text{CH}_3\text{CO}_3\text{H} \) 2. \( \text{H}^+,\text{H}_2\text{O} \)
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question 23 (1 point) to what category of elements does an element belo…
A. nonmetals ### Question 24
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1 multiple answer 2 points which reagents are used in the catalytic hyd…
C. Pt catalyst, D. H₂ gas
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question 20 (1 point) which of the following elements is in the same pe…
b. magnesium # Question 21
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question 54 (2 points) how many electrons does the ion ca²⁺ contain? bl…
18
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how are the frequency and wavelength of light related? they are directl…
- First question: C. They are inversely proportional to each other. - Second question: A. increase. - Third question: A. Group A elements.
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question 53 (2 points) how many electrons are in a rubidium ion (rb^+)?…
36
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question 52 (2 points) how many electrons are present in the d sublevel…
\(8\)
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question 14 (1 point) according to the aufbau principle, o a an orbital…
- Question 14: B. electrons enter orbitals of lowest energy first. - Question 15: D. 6 - Question 16: A. violet
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question 51 (2 points) how many electrons are there in the highest occu…
5
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question 11 (1 point) the shape (not the size) of an electron cloud is …
- Question 11: d. energy sublevel - Question 12: a. orbital shape - Question 13: d. \(s\), \(p\), and \(d\) only
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question 8 (1 point) what is the maximum number of orbitals in the p su…
A. 3 # Question 9
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question 5 (1 point) how does the energy of an electron change when the…
- Question 5: A. It decreases - Question 6: C. dumbbell - Question 7: B. 5
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question 51 (2 points) how many electrons are there in the highest occu…
Question 51: \(5\) Question 5[SSE Completed, Client Connection Error][SSE Completed, Client Connection Error][LLM SSE On Failure]
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question 3 (9 points) match each item with the correct statement below.…
1. a. period 2. h. group 3. g. periodic law 4. b. metal 5. c. transition metal 6. e. atomic radius 7. d. electrons 8. f. electronegativity 9. i. ionization energy ### Question 4
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question 47 (1 point) which of the following statements correctly compa…
B. The radius of an anion is greater than the radius of its neutral atom. # Question 48
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question 44 (1 point) which statement is true about electronegativity? …
- Question 44: B. Electronegativity generally increases from left to right across a period. - Question 45: A. higher - Question 46: A. ionization energy
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is the pronoun in bold reflexive or intensive? the west african savanna…
reflexive
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question 1 (5 points) match each item with the correct statement below.…
**Question 1** 1. b. atomic orbital 2. d. ground state 3. e. aufbau principle 4. c. electron configuration 5. a. Pauli exclusion principle **Question 2** 1. a. photon 2. b. quantu…
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question 41 (1 point) which of the following factors contributes to the…
B. increase in atomic size # Question 42
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question 36 (1 point) what is the element with the lowest electronegati…
- Question 36: B. cesium - Question 37: A. fluorine - Question 38: C. Li
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question 33 (1 point) which of the following statements is true about i…
A. When an anion forms, more electrons are transferred to it. # Question 34
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question 29 (1 point) which of the following elements has the smallest …
- Question 29: d. chlorine - Question 30: d. a positive charge - Question 31: d. Cations form when an atom loses electrons.
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suppose a 250. ml flask is filled with 1.4 mol of i₂ and 0.40 mol of hi…
| | $H_{2}$ | $I_{2}$ | $HI$ | |--|--|--|--| | initial | $0$ | $5.6$ | $1.6$ | | change | $x$ | $x$ | $-2x$ | | equilibrium | $x$ | $5.6 - x$ | $1.6-2x$ |
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question 30 (1 point) what is the charge of a cation? o a a positive ch…
a. a positive charge # Question 31
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question 51 (2 points) how many electrons are there in the highest occu…
Question 51: \(5\) Question 52: \(8\) Question 53: \(36\) Question 54: \(18\)
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question 27 (1 point) what element in the second period has the largest…
- **Question 27**: d. lithium - **Question 28**: d. more shielding of the electrons in the highest occupied energy level - **Question 29**: c. chlorine