化學
化學反應、化學計量、分子結構與元素性質。
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part iii: isotopes (stay on strand scoring) 8. which particles affect t…
Neutrons (and the ratio of protons to neutrons) affect the stability of the atom. ### Question 9
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when an unknown quantity of sulfuric acid dissociates in water, 8.65 kj…
A. \( \boldsymbol{q = -, w = 0} \)
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30.0 g of nh₄cl dissociates in water, resulting in the absorption of 67…
A. endothermic
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when 50.0 g of magnesium metal reacts with hydrochloric acid, it produc…
B. exothermic
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an atom has an average atomic mass of about 63.5 amu. what is the chemi…
B. Cu
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an atom has 24 protons and 12 neutrons. what is the chemical symbol for…
Cr
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what is the number of electrons in an electrically neutral atom equival…
D. atomic number (assuming options are labeled A - D as: A. number of neutrons, B. mass number, C. atomic weight, D. atomic number) ### Second Question (Protons + Neutrons)
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what is the electron configuration for oxygen (o)? use the periodic tab…
\(1s^2 2s^2 2p^4\) (the last option in the first question's choices) ### Second Question (Definition of Orbitals)
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an electrically neutral atom has the electron configuration $1s^2 2s^2 …
sulfur
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which subshell can have a maximum of 2 electrons? s p d f question 6 1 …
A. s ### Second Question (How many electrons would make the d shell complete?)
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what may happen to the electron when it gains energy? ○ it may drop to …
It may move to a higher energy level. ### Second Question (Which model is Bohr credited with developing?)
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hypothesize there are two ways the coins could have been made to look g…
Hypothesis 2 (The suspects heated the silver - looking coins. This mixes the zinc and copper metals. Mixing does not add matter. This mixture makes the coins look gold.) is the mo…
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the two half - reactions are given below. $7e^- + 4h_2o + reo_4^- \ igh…
2
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the redox reaction given below occurs in basic solution. reo₄⁻ + io⁻ → …
4
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the redox reaction given below occurs in basic solution. reo₄⁻ + io⁻ → …
7
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the electrons are on the reactants side. ?e⁻ + 4h⁺ + mno₂ → mn²⁺ + 2h₂o…
2
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manganese(iv) oxide is reduced to manganese(ii) ion in acidic solution.…
A
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oxalate ion reacts with manganese(iv) oxide, creating carbon dioxide an…
B
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what is the balanced chemical reaction occurring when potassium metal i…
\( 2\text{K}+\text{Pb}(\text{C}_2\text{H}_3\text{O}_2)_2 ightarrow2\text{KC}_2\text{H}_3\text{O}_2+\text{Pb} \) (the last option: \( 2\text{K}+\text{Pb}(\text{C}_2\text{H}_3\text{…
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what is the balanced chemical reaction occurring when zinc metal is add…
A. $\ce{Zn + 2HF ightarrow ZnF_{2} + H_{2}}$
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petra titrates 50.0 ml of an orange juice sample with 65.0 ml of 0.20 m…
\(0.078\)
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orange juice contains the triprotic acid citric acid, h₃c₆h₅o₇. petra t…
3
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63.45 ml of 0.250 m ba(oh)₂ reacts with 0.750 m hno₃ and reaches the en…
42.3
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tamera has been assigned a titration between nitric acid and barium hyd…
1
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what instrument is used as the reaction vessel in a titration experimen…
beaker
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how is the concentration of a solution typically calculated in a titrat…
by dividing moles by volume
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what volume of 1.25 m hcl reacts with 13.49 g al in the reaction below?…
1.2
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how many grams of mg(oh)₂ form when 75.0 ml of 0.60 m naoh react with e…
$\approx 1.31$
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what terms describe the particle model on the left? 0.5 mol h⁺ 0.5 mol …
D. Weak and Dilute
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what terms describe the particle model on the right? ○ 0.5 mol h⁺ ● 0.5…
Weak and Concentrated
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a container holds 3.0 l of 1.0 molar kclo₃ solution. how many moles of …
3.0 moles $\ce{ClO3^-}$
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a container holds 3.0 l of 1.0 m kclo₃ solution. how many moles of k⁺ i…
3.0 moles \( \ce{K+} \)
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which equation describes the dissociation of kclo₃ as it dissolves in w…
A. \( \text{KClO}_3 ightarrow \text{K}^+ + \text{ClO}_3^- \)
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a popular sports drink has 30.43 g of the sugar sucrose in 500. ml of t…
$0.178$
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the us department of health recommends adding sodium fluoride to munici…
$2.67\times 10^{-5}$ M (so the first box is 2.67, the second is -5)
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what is the balanced net ionic equation for the reaction below? hi(aq) …
\( \text{H}^+(aq) + \text{OH}^-(aq) ightarrow \text{H}_2\text{O}(l) \) (corresponding to the option \( \text{H}^+(aq) + \text{OH}^-(aq) ightarrow \text{H}_2\text{O}(l) \))
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what is the balanced net ionic equation for the reaction below? h₂so₄(a…
\( \ce{H^{+}(aq) + HSO^{-}_{4}(aq) + Ca^{2+}(aq) + 2OH^{-}(aq) -> CaSO_{4}(s) + 2H_{2}O(l)} \) (the second option: \( \boldsymbol{\ce{H^{+}(aq) + HSO^{-}_{4}(aq) + Ca^{2+}(aq) + 2…
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what is the net ionic equation for the reaction between calcium nitrate…
B. $\ce{Ca^{2+} + SO4^{2-} -> CaSO4}$
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what is the net ionic equation for the reaction between silver acetate …
3Ag⁺ + PO₄³⁻ → Ag₃PO₄
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what is the balanced chemical equation occurring when potassium metal r…
A. $2\text{K}(\text{s}) + 2\text{H}_2\text{O}(\text{l}) ightarrow 2\text{KOH}(\text{aq}) + \text{H}_2(\text{g})$
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what is the balanced chemical equation occurring when ammonium carbonat…
(NH₄)₂CO₃(aq) + 2KOH(aq) → 2NH₃(g) + 2H₂O(l) + K₂CO₃(aq)
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which of these is not a strong acid? hi h₂co₃ h₂so₄ hclo₄
\( \ce{H2CO3} \) (the option with \( \ce{H2CO3} \))
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which of these is not a strong base? ba(oh)₂ sr(oh)₂ lioh nh₃
D. \( \text{NH}_3 \)
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which of these is not a strong base? naoh ca(oh)₂ koh al(oh)₃
D. \( \text{Al(OH)}_3 \)
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which of these is not a strong acid? hclo₃ hclo₂ hclo₄ hcl
B. HClO₂
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what mass of na₂so₄ is required to generate 12.0 g baso₄? molar mass ba…
\( \frac{12.0 \times 142.04}{233.39} \approx 7.23 \) g (rounded to three significant figures)
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what mass of bacl₂ is required to generate 12.0 g baso₄? molar mass bas…
\( 10.7\ g \) (or more precisely \( 10.71\ g \))
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the reaction below produces a solid that some ct scans use as a marker.…
\(233.40\)
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what mass, in grams, of calcium chloride dihydrate would she need to us…
\( \boldsymbol{1079} \) (or more precisely, ~1079 g)
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what mass, in grams, of zinc sulfate heptahydrate would she need to use…
\( 2112 \) (or more precisely, after detailed calculation: \( \frac{1000}{136.14} \times 287.54 \approx 2112 \) g)
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a common art and building material is called plaster of paris, made fro…
\( 136.15 \)
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which of these is the correct balanced chemical equation, including sta…
$\boldsymbol{\ce{BaCl2(aq) + K2SO4(aq) → 2KCl(aq) + BaSO4(s)}}$ (the last option)
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which equation represents a solid ionic compound dissolving in water to…
A. $\ce{Na_{2}CO_{3} -> 2Na^{+} + CO_{3}^{2-}}$
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a strong acid is considered \strong\ because it is a strong electrolyte…
C. Most or all of the acid particles dissociate into \( H^+ \) and anions in water. (Note: Assuming the third option is labeled C; adjust label as per actual question's numbering)
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stalemate for the first time in a century, europe was engulfed in a lar…
The series of trenches on the Western Front in France and Belgium were six hundred miles long. ### Question 2
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what is gasoline an example of? a mixture of liquid in liquid a mixture…
a mixture of liquid in liquid
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what color is the light of the following wavelengths: 600 nm, 525 nm, a…
600 nm: Orange; 525 nm: Green; 475 nm: Blue ### Second Sub - Question: A molecule has a $\lambda_{max}$ of 475 nm. What wavelengths would probably not be good to use for testing s…
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the particle diagrams above show the changes that occurred after an equ…
C. The forward reaction has a faster rate than the reverse reaction between 0 s and 300 s because more products were being formed.
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$$ce{h_{2}(g) + i_{2}(g) ightleftharpoons 2hi(g)}$$hydrogen gas reacts …
C. The rate of the forward reaction becomes greater than the rate of the reverse reaction.
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unit 7 quiz: 7.1-7.2 refer to the following pcl₅(g) ⇌ pcl₃(g)+cl₂(g) pc…
C. decreases to become a constant nonzero rate at equilibrium
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brown colorless \\(\\ce{2no_{2}(g) \ ightleftharpoons n_{2}o_{4}(g)}\\)…
C. The total pressure of the system decreases then reaches a constant value because the amounts of reactant and product no longer change at equilibrium.
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the graph above represents the data collected under certain conditions …
D. At time D, because there are no observable changes in $\boldsymbol{[\ce{NO_{2}}]}$ and $\boldsymbol{[\ce{N_{2}O_{4}}]}$
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1.2 which of the following figures represents (a) a pure element, (b) a…
(a) Pure Element: (i) (b) Mixture of Two Elements: (v), (vi) (c) Pure Compound: (iv) (d) Mixture of Element and Compound: (ii), (iii) (Note: For each part, identify the figures as…
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from here write the responses in your notebook. 7. thinking questions 1…
A gas with <1% atmospheric composition matters due to its unique, essential functions (e.g., ozone’s UV shielding, CO₂’s greenhouse regulation, or trace gases’ role in biogeochemi…
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the condensed formula for the octane molecule is $\\ce{ch_{3}(ch_{2})_{…
The structural formula (full displayed) is: $$\text{H}-\underset{\underset{\text{H}}{|}}{\overset{\overset{\text{H}}{|}}{\text{C}}}-\underset{\underset{\text{H}}{|}}{\overset{\ove…
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amelie wants to make her home as safe as possible for her family. which…
C. Test to see whether a carbon monoxide detector works.
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individual elephants and arctic herbivores such as caribou tend to have…
A. It discusses a characteristic shared by certain animals in order to explain why researchers raised a possibility that turned out not to be supported by data described later in …
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why is choking considered an emergency situation? it may block the flow…
A. It may block the flow of air in the body.
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22. draw the particles before and after vaporization. created and copyr…
- **Left Box (Before Vaporization, Liquid):** Draw 5–7 small, closely - spaced circles (representing liquid particles, with moderate intermolecular attraction, moving past each ot…
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8,532 g = ______ kg
\(8.532\)
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48.75 ml = ______ l
\(0.04875\)
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22. draw the particles before and after vaporization. created and copyr…
- **Before Vaporization (Liquid)**: Draw a group of small, closely - spaced particles (e.g., circles) within the left rectangle. The particles should be relatively near each other…
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select all the correct answers. which two are important considerations …
The supplier meets relevant local, state, and federal laws. The supplier has records documenting employee performance.
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who did it? correctly match the person to their accomplishment. each na…
### Who Did It? (Questions 10 - 20) #### Question 10: Discovered the nucleus - **Explanation**: Rutherford's gold foil experiment led to the discovery of the atomic nucleus. - **A…
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15. explain in detail what happens to particles before, during, and aft…
- Before: Particles in liquid (or solid) have moderate (or low) KE, close (or fixed) arrangement. - During: Energy added, KE increases, particles overcome intermolecular forces. -…
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condense this structural formula.
$\text{CH}_3\text{CH}(\text{CH}_3)\text{CH}(\text{CH}_3)\text{CH}_3$
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6 what is true of two objects at the same temperature? a they have the …
D. Heat transfer between the two objects stops
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this image shows warm air from the radiator rising towards the ceiling.…
C. The warm air is less dense than the cool air
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40. indicate the bond type based on the change in electronegativity or …
$0-0.4$: Nonpolar covalent bond $0.4 < x < 1.7$: Polar covalent bond metal + nonmetal: Ionic bond
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water boils when it flows over molten rock at the base of a geyser. as …
The rock \boxed{loses} heat, and the water \boxed{gains} heat as it boils. The water boiling is an \boxed{endothermic} process.
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water boils when it flows over molten rock at the base of a geyser. as …
The rock \boxed{loses} heat, and the water \boxed{gains} heat as it boils. The water boiling is an \boxed{endothermic} process.
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ionic charge & electron configurations ions – formed when a neutral ato…
29. Group 1: $+1$; Group 2: $+2$; Group 13: $+3$; Group 14: $\pm4$; Group 15: $-3$; Group 16: $-2$; Group 17: $-1$; Group 18: $0$ 30. Li: CA; P: AN; Ag: CA; S: AN; O: AN; Zn: CA 3…
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question 5. calcium (ca), the fifth most - abundant element on earth, i…
1. Moles of Ca: $13.1\ \text{mol}$ 2. Moles of $\text{Cu(OH)}_2$: $0.0288\ \text{mol}$ 3. Moles of ibuprofen: $0.16\ \text{mol}$ 4. Moles of $\text{FeCl}_3$: $0.1621\ \text{mol}$ …
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periodic table - periods, groups, families of elements, lewis diagrams …
22. Group 2A: Alkaline Earth Metals Halogens: Group 7A Group 8A: Noble Gases Group 1A: Alkali Metals 23. A. Li, E. At, F. N, C. C, H. Al 24. C. S 25. B. atomic number 26. A. stron…
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18. how many protons, electrons and neutrons. does cadmium - 110 have? …
18. C. $48 p^+, 48e^-, 62n^0$ 19. 123 20. $\approx 50.94$ amu 21. Vanadium (V)
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hapter 2 the nature of matter additional problems sson 4 mixtures of ma…
1. a. tap water: Homogeneous mixture b. air: Homogeneous mixture c. raisin muffin: Heterogeneous mixture 2. - Pure substances have a fixed, definite chemical composition and uniqu…
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18 multiple choice 1 point after 2 half lives how much of the original …
25% (the option corresponding to 25%)
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addition & subtraction – least # of decimal places/digits behind the de…
13. 5 14. C. 120 mL 15. $0.0500$ mol 16. $7.8$ m 17. True
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26. (multiple choice) ions a through c above (from question #25) are al…
(Question 26): d) containing more protons than electrons, containing more electrons than protons ---
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3 multiple choice 1 point which of the following is most likely to pres…
C. Volcanic ash covering up the remains.
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3. the surfacing method that sprays high - temperature material onto a …
3. Thermal spraying 4. Chemical cleaning (or acid washing/alkaline cleaning; chemical cleaning is the general, widely used term)
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question 1. when iron is exposed to air, it corrodes to form red - brow…
1. $0.577$ moles 2. $0.00818$ moles 3. $0.500$ moles 4. $11.0$ moles
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23. (multiple choice) as you go from left to right on the periodic tabl…
### Question 22 - a) Incorrect; corrected to $\boldsymbol{[Ne]3s^23p^3}$ - b) Correct: $\boldsymbol{[Ne]3s^23p^3}$ - c) Correct: $\boldsymbol{1s^22s^22p^63s^23p^3}$ ### Question 2…
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precision – closeness of a set of data; the range can help with precisi…
9. $\approx 0.50\%$ 10. $329.95\ \text{K}$ 11. A. It is precise but not accurate. 12. $\approx 1.89\%$
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data handling, recording, and analysis & lab safety percent error, sign…
4. C. 46.0 mL 5. B. false 6. D. All the above should be done when heating the contents of a test tube. 7. D. sandals 8. D. disposed of according to teacher's directions
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1. which of the following would be classified as a heterogeneous mixtur…
1. B. oil and water 2. C. filtration 3. A. milk
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question 3 5 pts which of these is not a conventional characteristic of…
A. A strict ABAB rhyme scheme
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complete the rhyme scheme. under a spreading chestnut - tree the villag…
1. Under a spreading chestnut-tree: A 2. The village smithy stands;: B 3. The smith, a mighty man is he,: A 4. With large and sinewy hands,: B 5. And the muscles of his brawny arm…
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complete the rhyme scheme. the sun was shining on the sea, shining with…
1. The sun was shining on the sea, → A 2. Shining with all his might: → B 3. He did his very best to make → C 4. The billows smooth and bright— → B 5. And this was odd, because it…
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19. write the electron configuration and orbital diagrams for the follo…
a) Krypton: Electron Configuration: $1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^6$ Orbital Diagram: All orbitals fully paired (each subshell has $\uparrow\downarrow$ in every orbita…