Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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question 1 (1 point) how can oxidation numbers help you determine a red…
Oxidation numbers help determine redox reactions by showing electron transfer through changes in their values. They are used instead of valence numbers when valence concepts are i…
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the name for cus is a copper sulfite b copper (ii) sulfide c copper sul…
B. copper (II) sulfide
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the correct formula for aluminum nitride is a al₂n₃ b aln c alno₃ d al₃…
B. AlN
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the acid hbr is called a bromous acid b hydrogen bromide c bromic acid …
D. hydrobromic acid
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give the name for n₂o₅ a dinitrogen pentoxide b dinitrogen tetroxide c …
A. dinitrogen pentoxide
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na3po4 is named as a sodium phosphide b sodium(iii) phosphate c sodium …
D. sodium phosphate
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what is the formula for carbon tetrachloride? a ccl4 b ccl3 c ccl d c4cl
A. CCl₄
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question 6 (5 points) what is the ph of a 0.340 mol/l solution of sodiu…
$pH = 8.3$
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8. if a balloon filled with water is cooled enough, the water inside wi…
When the water freezes, the amount of matter in the balloon will remain the same.
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question 5 (6 points) a buffer solution is made from 0.650 mol/l ammoni…
pH = 9.5
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question 4 (8 points) 150.00 ml of 1.50 mol/l methanoic acid is being t…
$pH = 2.80$
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7. when two substances react to form one new substance, the mass of the…
equal to the mass of the two substances combined.
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question 3 (6 points) what is the ph of 0.45 mol/l solution of hypochlo…
pH = 3.9
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what is the mass, in grams, of 63.0 moles of c? 756 grams 5.25 grams 12…
756 grams
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6. the mass of substances after a chemical reaction is _ the mass of th…
equal to
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5. how could we prove that gases are made of tiny particles? o we could…
We could blow up a balloon.
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question 2 (4 points) consider the following reaction: n₂(g) + 3h₂(g) ⇌…
C. $[N_2]=3.15$ M, $[NH_3]=3$ M
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robert frosts poetry on virtue mending wall on virtue by phillis wheatl…
# Breve explicación: "On Virtue" de Phillis Wheatley y "Mending Wall" de Robert Frost usan un lenguaje comprensible y común, es decir, lenguaje cotidiano. "On Virtue" no es verso …
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4. rafael notices that after the sugar investigation, the mass of the t…
Andre: "When the sugar changed, some of it left the tube as carbon dioxide gas."
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what is the electron configuration for na+? 1s²2s²2p⁶3s² 1s²2s²2p⁶ 1s²2…
$1s^{2}2s^{2}2p^{6}$
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what charge would an element be in group 13 most likely make? 0 +2 +1 +3
+3
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which element has an electron located in a \p\ orbital? c he be li
C. C
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n₂(g) + 2o₂(g) ⇌ 2no₂(g) k = 1.96 x initially, 0.45 mol/l of nitrogen a…
$[\text{N}_2]=0.44\ M$, $[\text{O}_2]=0.66\ M$, $[\text{NO}_2]=0.020\ M$
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your teacher places a clump of iron wool on the scale and lights it on …
The mass would stay the same before and after burning.
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how many electrons may occupy a d - sublevel? 8 14 6 10
D. 10
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using your periodic table, which of the following elements has the same…
A. germanium (Ge)
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2. where on the periodic table do the lighter elements appear? the heav…
Lighter elements appear towards the top - left of the periodic table. Heavier elements appear towards the bottom - right of the periodic table.
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2. which of the following correctly explains how atoms can be used to i…
Atoms rearrange and form new structures during a chemical reaction.
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a certain element has a ground - state electron configuration of 1s²2s²…
Y
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1. are made of particles that are too small to be seen by the human eye…
All types of matter
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which orbital diagram represents an atom in group 18? 1s ↑↓ 2s ↑ 1s ↑↓ …
The third option (the one with $1s$ $\uparrow\downarrow$ $2s$ $\uparrow\downarrow$ $2p$ $\uparrow\downarrow$ $\uparrow\downarrow$ $\uparrow\downarrow$)
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1. give examples of properties of elements that appear in a pattern on …
Atomic radius, ionization energy, electronegativity
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unit 4l test 25 - 26 a beryllium (be²⁺) cation has - gained two electro…
lost two electrons
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if fluorine gains one electron, we call it a/an neutral atom anions cat…
B. anions
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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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name: trisha date: 9/30/ icients. 10. c₂h₅oh + o₂ → co₂ + h₂o 11. mg + …
$C_2H_5OH + 3O_2 ightarrow 2CO_2+3H_2O$; $Mg + 2HCl ightarrow MgCl_2 + H_2$
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question 1 - 9 review the following quote from machiavelli, the prince:…
A humanist approach that emphasized practical political analysis over idealism
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2.39 potassium has three naturally occurring isotopes (³⁹k, ⁴⁰k, and ⁴¹…
$^{39}K$ is more abundant.
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noemi is writing an essay on organic foods. she wishes to include prope…
She could summarize the ideas from the source. She could paraphrase the ideas from the source. She could directly quote the ideas from the source.
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creative writing 1203 unit review a. abstract thought b. allegory c. al…
(1) H. Epic (2) U. Philosophy (3) A. Abstract thought (4) CC. Syllogisms (5) Z. Short story (6) L. Imagery (7) AA. Simile (8) Q. Metaphor (9) T. Personification (10) J. Hyperbole …
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read the lines from the tide rises the tide falls. along the sea - sand…
It strengthens the connection between the two lines
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because of its rich blood supply, skeletal muscle is amazingly resistan…
1. atrophy 2. weakness 3. stimulated 4. muscles 5. aging
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roberto creates an animation titled \flying through an atom.\ the viewe…
The viewer travels through the electron cloud, then the nucleus.
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which part of an atom is mostly empty space? a. nucleus b. proton cloud…
C. electron cloud
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the venn diagram compares protons with neutrons. which shared property …
B. Has mass of 1 amu