化学
化学反应、化学计量、分子结构与元素性质。
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multiple choice 1 point in an ethane (c2h6) molecule, each carbon atom …
3
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18 multiple choice 1 point which of the following molecules is often us…
Ketones
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multiple choice 1 point why are hydrocarbons insoluble in water? they a…
The majority of their bonds are nonpolar covalent carbon-to-hydrogen linkages.
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the metal bar shown is an alloy of silver and other metals. 7.5 ounces …
0.675
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which of the following is not an example of particulate matter? soot du…
D. carbon monoxide
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ozone the pollutant and sulfuric acid are pollutants that are not relea…
Secondary pollutant
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vocs are air pollutants. what does voc stand for? volatile organic comp…
A. Volatile Organic Compounds
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drying fruit usually means applying heat, which usually causes deformat…
C) the method's ability to achieve consistent dehydration at ambient temperature suggests potential for specialized industrial uses where preservation of color and shape is critic…
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a recent study reports that ionic liquids—which have the potential to s…
C) the concept of planetary habitability may need to expand beyond current criteria to include certain environments where liquid water cannot exist.
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what is the iupac name of the molecule? the name is: 3,6 - diethyl - 5 …
C. 4,7-diethyl-5-isobutyl-2-methylnonane
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maxwell elect the correct iupac name for the branched chain alkane. the…
4-ethyl-5,6,8-trimethyldecane
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organic chemistry maxwell select the correct iupac name for the branche…
3,5-dimethyl-7-(2-methylpropyl)tridecane
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directions: using the picture, come up with four words that rhyme with …
### For "stew" (rhyming words): 1. Identify the rhyme scheme: The word "stew" has the vowel sound /uː/ (or similar, depending on accent) and the ending -ew. 2. Generate words with…
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which statement is the most effective claim? - organic foods are a heal…
A. Organic foods are a healthier option than conventional foods.
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which is a characteristic of mixtures? they can be classified as pure s…
The correct option is: They can be separated by physical processes.
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a solid precipitate is formed from the reaction of lead nitrate and sod…
filtration
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which method would be best for separating the components of a mixture t…
C. distillation
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the chemical formula for an emerald is $\\ce{be_{3}al_{2}(sio_{3})_{6}}…
B. a pure substance because it is a compound.
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which is a substance that is made up of only one type of atom? element …
A. element
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a teacher makes this statement. \gasoline boils at a relatively low tem…
A. distillation of a mixture
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bromine, a liquid at room temperature, has a boiling point of $58^{circ…
C. pure substance
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which is a pure substance? soda carbon dioxide gasoline salt water
carbon dioxide
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which best describes an element? a type of a mixture; a pure compound; …
D. a pure substance (assuming the last option is labeled D; if the labels are different, adjust the label but keep the text "a pure substance")
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6) on a separate sheet of paper, write out the problem using all the st…
$34\ \text{mol}$ --- ### For Question 6:
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how many moles of bromine are needed to create 5.0 moles of phosphorus …
7.5 mol
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what caused this kind of weathering? (select the best answer) chemical …
Differential Weathering
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9) choose the best answer. in the synthesis reaction $2h_2 + o_2 \ ight…
1. Balanced equation: $4\text{Fe}(s) + 3\text{O}_2(g) ightarrow 2\text{Fe}_2\text{O}_3(s)$ 2. 6 mole ratios: $\frac{4\ \text{mol Fe}}{3\ \text{mol O}_2}$, $\frac{3\ \text{mol O}_2…
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lohse chem 181 15. express the following d and appropriate units. $d = …
$2.214\ \text{g/mL}$
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2. all elements are composed of extremely small particles called: a. co…
c. Atoms
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*target # 1- identify the structures and properties of matter by explai…
a. Elements
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14. how many neutrons does an atom of the isotope copper - 65 have?
36
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5. to prove conservation of mass, students perform a lab using a flask,…
1. The experiment fails to prove conservation of mass because the carbon dioxide gas produced escapes from the open Erlenmeyer flask, so it is not included in the final mass measu…
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the reaction of sodium hydrogen carbonate and acetic acid is described …
1, 1, 1, 1, 1
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25. during the combustion of methane (ch₄), one mole of methane gas com…
D. $\text{CH}_4(g) + 2\text{O}_2(g) ightarrow \text{CO}_2(g) + 2\text{H}_2\text{O}(g)$
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24. which of the reactions below are replacement reactions? select two …
B. $\text{Mg}(s) + 2\text{HCl}(aq) ightarrow \text{H}_2(g) + \text{MgCl}_2(aq)$ E. $\text{Zn}(s) + 2\text{HCl}(aq) ightarrow \text{ZnCl}_2(aq) + \text{H}_2(g)$
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and copper (ii) chloride mixed and reacted. the results were a clumpy o…
A. $3\text{CuCl}_2\text{ (aq)} + 2\text{Na}_3\text{PO}_4\text{ (aq)} ightarrow \text{Cu}_3(\text{PO}_4)_2\text{ (s)} + 6\text{NaCl (aq)}$
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which equation above represents a precipitation reaction? \\( 2h_2(g) +…
B. $\text{AgNO}_3 \ (aq) + \text{NaOH} \ (aq) ightarrow \text{AgOH} \ (s) + \text{NaNO}_3 \ (aq)$
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which equation above represents a precipitation reaction? \\( 2h_2(g) +…
B. $\text{AgNO}_3 \ (aq) + \text{NaOH} \ (aq) ightarrow \text{AgOH} \ (s) + \text{NaNO}_3 \ (aq)$
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21. directions drag and drop the correct answer choice to each answer b…
Reaction 1: acid-base neutralization Reaction 2: reducation-oxidation Reaction 3: precipiation reaction
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20. what are the coefficients that would correctly balance this reactio…
B. 1, 2, 1
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19. a strip of copper is placed in a solution of silver nitrate. what w…
B. Copper will go into the solution as ions, and silver will form.
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18. directions drag and drop the correct answer choice to each answer b…
1. $2\text{NH}_3 + \text{H}_2\text{SO}_4 ightarrow (\text{NH}_4)_2\text{SO}_4$ is a **synthesis** reaction 2. $\text{NH}_4\text{OH} ightarrow \text{NH}_3 + \text{H}_2\text{O}$ is …
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17. a student observes what happens when two different aqueous solution…
B. A solid settles out.
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16. directions select all the correct answers. identify the coefficient…
2 (in front of $\text{KClO}_3$), 2 (in front of $\text{KCl}$), 3 (in front of $\text{O}_2$)
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15. directions choose the correct answer for each row. for each compoun…
1. $AgCl$: Forms a Precipitate 2. $NaNO_3$: Remains Dissolved 3. $BaSO_4$: Forms a Precipitate 4. $K_2SO_4$: Remains Dissolved 5. $PbI_2$: Forms a Precipitate
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after the reaction. the reaction is illustrated below. the mass of the …
B. The carbon dioxide escaped because the flask was not stoppered.
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13. the reaction between solid aluminum and liquid bromine is exothermi…
A. $2\text{Al}(s) + 3\text{Br}_2(l) ightarrow 2\text{AlBr}_3(s)$
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12. in a lab report, students must write out the word equation for zn +…
D. Zinc and lead (II) nitrate react to form zinc nitrate and lead
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11. which coefficients are required to correctly balance the equation, …
2, 5, 4, 2 (the first option, e.g., A. 2, 5, 4, 2 if options are labeled A,B,C,D with first as A)
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chuck wants to know how many electrons in an atom are not paired up. wh…
D. an orbital notation of the atom
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how is this model useful? ○ it shows how electrons are distributed in t…
B. It shows how electrons are distributed in the shells of an iron atom.
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what is the electron configuration of chlorine (cl)? ○ $1s^22s^22p^63s^…
B. \(1s^22s^22p^63s^23p^5\)
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10. which equation represents a neutralization reaction? $2h_2(g) + o_2…
D. $\ce{H2SO4 (aq) + 2NaOH (aq) -> Na2SO4 (aq) + 2H2O (l)}$
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9. the formation of rust is described in the following statement. four …
D. $4 \text{ Fe (s)} + 3 \text{ O}_2 \text{ (g)} ightarrow 2 \text{ Fe}_2\text{O}_3 \text{ (s)}$
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which is the noble - gas notation for lead (pb)? ○ rn6s²4f¹⁴5d¹⁰6p² ○ r…
[Xe]6s²4f¹⁴5d¹⁰6p² (the third option)
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13 multiple choice 4 points the process in which a gas cools and its mo…
13. A. condensation. 14. A. Asteroids with hydrogen and carbon compounds, progressing toward asteroids made primarily of iron and silicates.
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it is easier to determine the electron configurations for the p-block e…
B. their electrons are assigned to s and p orbitals only.
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station 1 understanding the periodic table if an atom of oxygen has an …
E. there are 8 protons.
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in which block of the periodic table is chromium (cr) found? ○ s block …
B. d block
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9. the formation of rust is described in the following statement. four …
D. $4 Fe (s) + 3 O_2 (g) ightarrow 2 Fe_2O_3 (s)$
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station 1 understanding the periodic table which of the following lists…
B. C, Al, P, Cl
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what is the number of valence electrons in cadmium (cd)? 1 2 10 12
B. 2
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8. which of the following are true of the equation below? $2\\ce{nacl} …
B. It is a decomposition reaction E. The equation is balanced
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which of the following are true of the equation below? 2nacl → 2na + cl…
B. It is a decomposition reaction E. The equation is balanced
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the electron configuration of nitrogen (n) is $1s^22s^22p^3$ $1s^22s^22…
A. \(1s^22s^22p^3\)
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7. methane, ch₄, is natural gas containing both carbon and hydrogen. wh…
A. Combustion
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1 multiple choice 4 points based on our understanding of our own solar …
1. The planets nearest to the parent star have a lower density than the planets farther out. 2. but all formed from the same basic group of chemicals.
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hydrogen reacts with an element to form a compound. which element would…
B. chlorine
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6. __nh₃ + __ o₂ → __n₂ + __h₂o after correctly balancing this chemical…
4
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station 1 understanding the periodic table use the decoder to get the l…
To solve this, we need to know the context of what letters we are decoding (since the problem mentions "use the decoder" but the specific letters to decode aren't provided here). …
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which is the electron configuration for nobelium (no)? ○ rn7s²5f¹⁴ ○ rn…
[Rn]7s²5f¹⁴
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station 1 understanding the periodic table which two letters represent …
M. (S, T)
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4. which statements of the following are true regarding the equation li…
D. The equation is balanced E. This is a single replacement reaction
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add lone pairs where necessary and determine the hybridization of the i…
1. Lone pairs added: Oxygen (2 lone pairs), Nitrogen (1 lone pair) 2. Hybridizations: - C₁: $sp^2$ - C₂: $sp^3$ - C₃: $sp^3$ - C₄: $sp$ 3. Number of sigma (σ) bonds: 11 4. Number …
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zn + hcl → zncl₂ + h₂ secl₆ + o₂ → seo₂ + cl₂ fe + h₂so₄ → fe₂(so₄)₃ + …
1. $\boldsymbol{1Zn + 2HCl ightarrow 1ZnCl_2 + 1H_2}$ 2. $\boldsymbol{1SeCl_6 + 2O_2 ightarrow 1SeO_2 + 3Cl_2}$ 3. $\boldsymbol{2Fe + 3H_2SO_4 ightarrow 1Fe_2(SO_4)_3 + 3H_2}$ 4. …
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bf₃ + ____li₂so₃ → ____b₂(so₃)₃ + ____lif na₃po₄ + ____hcl → ____nacl +…
1. $2\text{BF}_3 + 3\text{Li}_2\text{SO}_3 ightarrow \text{B}_2(\text{SO}_3)_3 + 6\text{LiF}$ 2. $\text{Na}_3\text{PO}_4 + 3\text{HCl} ightarrow 3\text{NaCl} + \text{H}_3\text{PO}…
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1. classify each of the following as mixtures, pure compounds or elemen…
## Question 1 a. pure compound b. mixture c. element d. pure compound e. pure compound f. mixture g. pure compound h. element i. mixture ## Question 2 a. physical property b. chem…
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oxygen and water, creating hydrated iron oxide, otherwise known as rust…
No, every chemical change does not show all the signs. The text says some signs (color change, odor, heat/light, gas/solid formation) exist, but examples like rust (color change, …
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chem introduction 4 assignment 1. write in the number corresponding to …
a. $1\ \text{kg} = 1000\ \text{g}$ (or $1\times10^3\ \text{g}$) b. $1\ \text{mm} = 0.001\ \text{m}$ (or $1\times10^{-3}\ \text{m}$) c. $1\ \mu\text{g} = 0.000001\ \text{g}$ (or $1…
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student exploration: moles prior knowledge questions (do these before u…
### Prior Knowledge Questions 1. **Answer**: For a dozen donuts, a dozen eggs, and a dozen roses, you have 12 of each item. (Because a dozen is defined as 12 of something.) 2. **A…
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quiz question 7 of 10 in the early 20th century, scientists discovered …
D. nitric acid
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quiz question 1 of 10 which of the following is true of nitrogen? choos…
A. It's the most abundant element in the atmosphere.
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convert 0 °c to °f. round to the nearest whole number. answer numeric 1…
32 212 Yes; 75.2
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convert 110 kelvin to °c answer numeric 1 point convert 45°f to °c. rou…
-163.2 °C -7.2 °C 32 °C
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4. what do the elements sulfur (s), nitrogen (n), phosphorus (p), and b…
All of these elements are non-metals (gold-colored on the provided periodic table).
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3. what is the atomic number of this element? 12 24.305 24
12
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2. elements on the periodic table of elements are primarily listed in a…
the number of protons
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1. which characteristic of an atom determines whether it will combine w…
A. Its number of valence electrons
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human activities and earth’s atmosphere evidence from scientific studie…
B. using renewable energy sources instead of fossil fuels
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la ecuación para la ph de una sustancia es $\\text{ph} = - \\log\\text{…
3.3
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day 4: thursday, january 22nd (4 total days in the quarter) define \org…
Organic chemistry is the branch of chemistry that studies carbon - containing compounds (and their structure, properties, synthesis, and reactions), often with other elements like…
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el aderezo que se usa para las ensaladas es un ejemplo de — a. sustanci…
D. mezcla heterogénea.
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¿cuál criterio se utiliza para agrupar los elementos de la tabla periód…
C. las propiedades químicas y físicas similares que comparten
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en un experimento se vierten 4 líquidos con densidades distintas en un …
D. glicerina, agua, aceite de palma, isopropanol
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la ilustración muestra el diagrama de lewis para el elemento argón. ¿cu…
$1s^2 2s^2 2p^6 3s^2 3p^6$
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un objeto con una masa de 13.0 g y un volumen de 63.0 ml se echa en un …
C. Flotará porque la densidad del objeto es menor que la del agua.
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una materia formada por la unión física de dos o más materiales y que t…
B. mezcla homogénea.
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para realizar un experimento, es necesario separar una mezcla que conti…
D. filtración
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la supervisión y actualización de la tabla periódica está a cargo de un…
B. Unión Internacional de Química Pura y Aplicada
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complete the passage with the words that make the most sense. supernova…
First blank: supernovas Second blank: molecules