化學
化學反應、化學計量、分子結構與元素性質。
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when we fill out electron configurations, we go about it as if we were …
Reading a book, left to right, top to bottom
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14) choose true or false. a definition for the underlined word is illog…
14) A. False 15) A. True
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a green flame is seen when copper (ii) is burned. how is the green ligh…
When the electrons, after being excited, fall to a lower energy level.
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which of the following is the electron configuration for beryllium (be)…
$1s^{2}2s^{2}$
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what is the correct lewis dot structure for arsenic? o ·as· o :as· o ·a…
:As: .. .
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the correct lewis structure for coh2 contains how many covalent bonds? …
First question: C. 4 Second question: None are correct (the correct answer is 3)
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which of the following elements would make one covalent bond? o (oxygen…
1. H (Hydrogen) 2. 2
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sulfur is represented by the following lewis dot structure: which of th…
C. Oxygen
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an electron further away from the nucleus has less mass less energy mor…
more energy
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what is the formula for calcium oxide? cao2 ca2o cao ca2o2 none are cor…
1. C. CaO 2. E. Magnesium Chloride
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10. complete the following table: | isotope name | isotope notation | a…
| Isotope Name | Isotope Notation | Atomic Number | Mass Number | # Protons | # Electrons | # Neutrons | |---|---|---|---|---|---|---| | Lithium - 7 | $^{7}_{3}Li$ | 3 | 7 | 3 | 3…
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question 1 (1 point) which of the following statements is true: a metal…
Question 1: D. O (Oxygen) and H (Hydrogen) will make a covalent bond with each other Question 2: C. When Sodium becomes an ion it becomes a cation
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which of the following orbital diagrams is incorrect?
The second option (with 1s filled, 2s with one - electron and 2p orbitals starting to be filled) is incorrect.
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what element has an electron arrangement of: 2,8,4? none are correct ti…
Question 1: C. Si Question 2: A. Cs
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which of the following orbital diagrams is incorrect? possible points:
Without labels for each option (A, B, C, D), it's not possible to specify which one is incorrect. But the incorrect one would violate electron - filling rules like Hund's rule, Pa…
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element orbitals electron configuration 1s 2s 2p nitrogen (n) 1s²2s²2p³…
C. Fluorine (F)
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how many valence electrons does this element have? 1s²2s²2p⁴
6 (corresponding to the option with the value 6)
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if the density of a material is 19.3 g/ml and the volume is 4.6 ml, det…
88.8
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think about new england stone walls as you read. they were built using …
Most lines are a complete thought.
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if an atom has 5 protons and and 6 neutrons, what is the mass number fo…
Question 1: D. 11 Question 2: E. Nitrogen will always have 7 protons
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an element has an electron configuration of 1s²2s²2p⁶3s¹. using the abo…
B. X
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numeric 4 points the density of a material was 7.86 g/ml. determine the…
# Explicación: ## Paso 1: Recordar la fórmula de densidad La densidad $ ho=\frac{m}{V}$, donde $ ho$ es la densidad, $m$ es la masa y $V$ es el volumen. Re - arreglamos la fórmula…
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question 3 (1 point) which of the following elements is a halogen? fe (…
Question 3: C. Cl (Chlorine) Question 4: A. None are correct
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what element is in group 14 period 5? zr (zirconium) u (uranium) o (oxy…
Question 1: E. Sn (Tin) Question 2: E. Cs (Cesium)
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organic farming techniques are specifically designed to limit the use o…
A. chemical fertilizers and pesticides
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numeric 3 points calculate the density of sulfuric acid if 35.4 ml of t…
# Explicación: ## Paso 1: Recuerda la fórmula de densidad La densidad ($ ho$) se define como $ ho=\frac{m}{V}$, donde $m$ es la masa y $V$ es el volumen. ## Paso 2: Sustituye los …
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numeric 3 points what is the mass of the ethyl alcohol that exactly fil…
# Explicación: ## Paso 1: Escribir la fórmula de densidad La densidad ($ ho$) está dada por $ ho=\frac{m}{V}$, donde $m$ es la masa y $V$ es el volumen. Re - arreglamos la fórmula…
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a block of aluminum occupies a volume of 15.0 ml and weighs 40.5 g. wha…
# Explicación: ## Paso 1: Identificar la fórmula de densidad La densidad ($ ho$) se calcula con la fórmula $ ho=\frac{m}{V}$, donde $m$ es la masa y $V$ es el volumen. ## Paso 2: …
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which of the following is an example of an organic shape? (1 point) a t…
C. A leaf
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find the mass of 250.0 ml of benzene. the density of benzene is 0.8765 …
$219.1$
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an empty flask that has a mass of 345.80 g is filled with 225 ml of car…
1.59 g/mL
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sch 4u name: alkanes, alkenes, alkynes, benzene, halides 1. provide the…
a) $CH_3C(CH_3)=C(CH_3)CH_3$ b) A 5 - membered ring with $-Br$ on one carbon and $-I$ on an adjacent carbon.
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mercury metal is poured into a graduated cylinder that holds exactly 22…
$13.6$
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which shells (also known as blocks) do we use for the quantum mechanica…
S, P, D, and F
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what properties do metalloids have? only metallic properties properties…
Properties of both metals and nonmetals
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what are the characteristics of alkaline - earth metals found in group …
Stronger and denser with higher melting points than alkali metals
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what is the main reason that elements in the same group of the periodic…
They have the same number of valence electrons.
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what is the main purpose of the periodic table according to the text? t…
To predict the behavior of new elements
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according to the text, what do silver, gold, and platinum have in commo…
They are all metals
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which statement is true about the noble gases in terms of their chemica…
They have a full valence shell and are mostly inert.
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how might a chemist use patterns to understand phenomena? by ignoring t…
D. By using patterns to predict outcomes
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starting on page 94 1. the three main surface processes are weathering,…
1. erosion 2. Weathering 3. Chemical 4. weathering; mechanical 5. Tectonic; temperature changes; water; ice 6. grow 7. freezes; crack 8. chemical
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why are noble gases considered stable? they have incomplete electron sh…
They have a full outer electron shell.
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1. identify the number of valence electrons. 2. put a check mark in the…
| Bohr Model | # of valence electrons | Will give away (lose) valence electrons | Will add (gain) extra electrons | |---|---|---|---| | H | 1 | √ | √ | | O | 6 | | √ | | Na | 1 | …
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1. identify the number of valence electrons. 2. put a check mark in the…
| Bohr Model | # of valence electrons | Will give away (lose) valence electrons | Will add (gain) extra electrons | |--|--|--|--| | H | 1 | √ | √ | | O | 6 | | √ |
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the decomposition of trinitrotoluene (tnt, c₇h₅n₃o₆) was studied in a b…
$\Delta_{r}U = 1050.49\ kJ\ mol^{-1}$, $\Delta_{r}H = 1062.88\ kJ\ mol^{-1}$
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64. dry hair with average elasticity will stretch up to 50 percent of i…
64. T 65. T 66. T 67. T For the short - answer question: Gently stretch a strand of the client's hair. If it stretches a small amount and breaks easily, it has low elasticity. If …
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in the chemical equation 2h₂ + o₂ → 2h₂o, if you have 2 moles of h₂ and…
a. Neither is a limiting reactant
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21. what is the bond order of the carbon - oxygen bond in cof2? a. 1.5 …
C. 2
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25._____ intended to influence the attitudes and actions of large numbe…
(25) Propaganda (26) Chanson de geste (27) Polymath (28) Rhyme - scheme (29) Treatise (30) Irony (31) Sonnet (32) Italian political philosopher, author of The Prince (33) Italian …
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7/15 what are valence electrons? electrons that are on the outermost sh…
Electrons that are on the outermost shell of the atom (and will therefore be the ones forming bonds and creating reactivity)
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35. a disulfide bond is a strong ______ side bond. a) chemical b) salt …
35. A. chemical 36. B. hair relaxers 37. C. test the tools out on your own hair first 38. Disulfide - Front: Disulfide; Back: Strong chemical bond, broken by permanent wave soluti…
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29. the side - bonds that link across the polypeptide chains are respon…
30. D. hydrogen, salt, and disulfide 31. B. 1/3 32. A. hydrogen 33. C. by water or heat, such as during wet and thermal styling 34. B. by a change in pH, such as from the applicat…
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20. which bond is the shortest? a. n=n b. c=c c. n≡n d. s=o e. c - c
C. $N\equiv N$
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which features make this an example of a shakespearean sonnet? select t…
the abab, cdcd, efef, gg rhyme scheme the widespread use of iambic pentameter the use of three quatrains followed by a couplet
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concept 3 - weathering erosion and deposition starting on page 94 1. th…
1. Weathering, Erosion, Deposition 2. Weathering, Physical 3. Chemical 4. Weathering, Mechanical 5. Tectonic, Temperature changes, Water, Ice 6. Grow 7. Freezes, Crack 8. Chemical…
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fill in the systematic names of the following chemical compounds. note:…
$H_2O$: Water $S_4Se_4$: Tetrasulfur tetraselenide $XeO_3$: Xenon trioxide $XeF_6$: Xenon hexafluoride $SeS_2$: Selenium disulfide
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find the relative clause. if it is nonrestrictive, set it off with comm…
When adding organic materials to a compost pile, gardeners should avoid animal products and fats in favor of scraps from plants that have not been treated with pesticides.
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select the correct answer from each drop - down menu. an element has an…
The element has 7 protons and 9 neutrons.
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during photosynthesis, the reactants are transformed into products thro…
| Type of atom | Carbon dioxide | Water | Glucose | Oxygen | | ---- | ---- | ---- | ---- | ---- | | hydrogen (H) | 0 | 2 | 12 | 0 | | carbon (C) | 1 | 0 | 6 | 0 | | oxygen (O) | 2…
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what are the molecular and empirical chemical formulas of a compound ma…
Molecular formula: $C_{4}H_{8}O_{4}$ Empirical formula: $CH_{2}O$
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write the systematic name of each organic molecule: structure name 2,5 …
3 - methylhexanal
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write the systematic name of each organic molecule: structure name
2,5 - dihydroxypentanal
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practice: predicting products of chemical reactions use your knowledge …
1. \(4Na+O_2 ightarrow2Na_2O\) 2. \(Mg + F_2 ightarrow MgF_2\) 3. \(2Na+Cl_2 ightarrow2NaCl\) 4. \(2Al + 3S ightarrow Al_2S_3\) 5. \(3Ca+2P ightarrow Ca_3P_2\) 6. \(2HgO ightarrow…
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this basics quiz should be straightforward if you have watched the basi…
C. partial charge
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electron configurations worksheet write the complete ground - state ele…
Complete electron configurations: 1. Lithium: $1s^{2}2s^{1}$ 2. Oxygen: $1s^{2}2s^{2}2p^{4}$ 3. Calcium: $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}$ 4. Nitrogen: $1s^{2}2s^{2}2p^{3}$ 5…
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chemical hazards exist in many forms, including mist, gas, and fibers. …
Liquid
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demareass employer has started using a new industrial cleaner. even tho…
No
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question 4 (1 point) use what you learned from watching the videos to a…
\(X_2Y\)
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select the chemical hazards that can be particularly hazardous to worke…
Carbon monoxide, Hydrogen sulfide, Solvent vapors
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question 5 (1 point) use what you learned from watching the videos to a…
$X_{2}Y_{3}$
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which of the following is most likely to be the correct formula for cal…
There is no correct option given as the correct formula for calcium bromide is $CaBr_{2}$, but if we assume it's a matter of correct elements combination, the closest in terms of …
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a small amount of chemical splashes in franks eye. what should frank do…
use the eyewash station while his lab partner informs the teacher
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exploring properties of water directions: write all answers on the next…
a. A homogeneous mixture is formed because the sodium pentothal dissolves uniformly in water creating a single - phase system with consistent composition. b. Water is a polar solv…
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which statement best describes the formation of a solution? a large amo…
A small amount of solute is dissolved in a larger amount of solvent.
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in which situation can a mixture always be called a solution? when one …
when the mixture is homogeneous
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which of the following is a homogenous mixture? blood steel cloud muddy…
steel
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a solid is stirred into a liquid and dissolves. which type of mixture f…
C. a solution
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which waste items should always be discarded in the hazardous waste con…
A. bacterial cultures
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what are homogeneous mixtures of metals commonly called? alloys colloid…
A. alloys
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which refers to a mixture that contains more than one phase in which th…
C. heterogeneous
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which is a characteristic of a solution? its particles scatter light. i…
Its particles are evenly distributed.
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which substance is an example of a colloid? o milk o tomato juice o san…
A. milk
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according to quizlet, natural phenomena is defined as any event or aspe…
True
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according to quizlet: natural phenomena is defined as any event or aspe…
True
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based on the following balanced equation: 4h₂o + 7co₂ → c₇h₈ + 9o₂. how…
2
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based on the following balanced equation: p₄ + 5o₂ → 2p₂o₅. what is the…
$5O_{2}:2P_{2}O_{5}$
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use the following balanced equation to answer the questions: c + 2s → c…
$64.14\ g$
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background: the normal electron configuration of atoms or ions of an el…
1. Safety: Wear safety goggles, work in a well - ventilated area, keep flammable materials away, use tongs/gloves for hot objects, follow chemical handling procedures. 2. Ground S…
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use the following balanced equation to answer the questions: c + 2s → c…
2
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1. verify that each of the following numbers contains four significant …
1. - a) Significant digits: 4, 1, 8, 2 - b) Significant digits: 4, 9, 4, 1 - c) Significant digits: 3, 2, 0, 1 - d) Significant digits: 3, 0, 0, 2 2. - a) 5 - b) 2 - c) 4 - d) 1 -…
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which of these did you include in your answer? check any that apply. th…
The juice contains sugars, plant pigments, and other chemicals dissolved in water. This is a solution. The pieces of orange pulp will rise to the top or settle to the bottom of th…
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chemquest 2 significant figures name: ave brean date: 9 - 09 - 05 hour:…
1. a) Signficant digits: 4, 1, 8, 2 b) Signficant digits: 4, 9, 4, 1 c) Signficant digits: 3, 2, 0, 1 d) Signficant digits: 3, 0, 0, 2 2. a) 5 b) 2 c) 4 d) 1 e) 6 f) 2
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shaving cream has gas dispersed throughout the cream. what type of mixt…
A. colloid
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ecking all of the terms that apply. salad dressing homogeneous heteroge…
B. heterogeneous E. suspension
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describe the following mixtures by checking all of the terms that apply…
heterogeneous, colloid
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mixtures by checking all of the terms that apply. smoke homogeneous het…
heterogeneous, colloid
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if the partial pressure dropped from 22 to 15 kpa throughout this exper…
A. $0.272$ ml L$^{-1}$ kPa$^{-1}\times40$ L$\times7$ kPa
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describe the following mixtures by checking all of the terms that apply…
homogeneous, solution
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describe the following mixtures by checking all of the terms cranberry …
homogeneous, solution