化学
化学反应、化学计量、分子结构与元素性质。
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16 multiple choice 0.3 points of the following, only ________ is a chem…
C. tarnishing of silver
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13 multiple choice 0.3 points which one of the following is an intensiv…
temperature
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portions of orbital diagrams representing the ground - state electron c…
The second option violates the Pauli exclusion principle.
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12 multiple choice 0.3 points which of the following is a mixture? hcl …
B. chocolate pudding
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what is the maximum number of electrons that can have n = 4, m_l = 2 in…
2
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the synthesis of products is limited by the amount of reactants added t…
How many moles of hydrogen? 120 mole(s) How many moles of carbon? 2 mole(s) How many moles of oxygen? 58 mole(s) How many moles of nitrogen? 1 mole(s) How many moles of sulfur? 1 …
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write the ground - state electron configuration for each element. part …
Part 1 of 2: 1s²2s²2p⁶3s²3p⁴ Part 2 of 2: [Xe]4f¹⁴5d¹⁰6s¹
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determine the maximum number of electrons that can be found in each of …
Part 1 of 4: 2 Part 2 of 4: 10 Part 3 of 4: 6 Part 4 of 4: 14
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applying the law of conservation of energy which statement is an exampl…
When a light bulb is turned on, electrical energy is converted to light and heat.
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select the quantum numbers associated with the 2p orbital. principal qu…
Principal quantum number ($n$): 2 Angular momentum quantum number ($l$): 1 Possible magnetic quantum numbers ($m_l$): -1, 0, 1
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question 14 a 55 - year - old has developed a pressure ulcer on her rig…
Question 14: C. L89.319 When is it appropriate to use history of malignancy from category Z85?: It has been excised, no evidence of any existing primary malignancy, and there is n…
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determine the charge on the cation. part 1 of 3 write the symbol and ch…
Part 1 of 3: Pb²⁺ Part 2 of 3: Cu²⁺ Part 3 of 3: Fe³⁺
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write the name for each of the following ionic compounds. part 1 of 2 n…
Part 1 of 2: Sodium sulfide Part 2 of 2: Potassium nitride
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consider the following ionic compounds. part 1 of 2 write the systemati…
Part 1: gold(III) nitride Part 2: tin(IV) sulfide
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for the last electron for s, quantum numbers values are a n=3, l=0, m=-…
B. $n = 3, l = 1, m = 1, s=\frac{1}{2}$
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write the name for the co₃²⁻ ion.
Carbonate ion
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identifying energy transformations what energy transformation is taking…
chemical energy to thermal energy
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bonding takes place to achieve ______ a stability b friendship c zero e…
A. stability
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how can carbon dioxide be considered a pollutant when it is a natural c…
B. Carbon dioxide is considered a pollutant when larger concentrations than normal are present in the air as a result of human activity.
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convert the following temperatures to kelvin. round your answers to the…
Part 1 of 3: 195 K Part 2 of 3: 310 K Part 3 of 3: 266 K
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for noble gases, ionization energy is expected to be ____ and electron …
A. very high, zero
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soot results from burning organic compounds. soot is an example of ____…
A. a primary pollutant
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bromine is a reddish brown liquid. calculate its density if 421.2 g of …
$3.12$
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write the chemical formula for aqueous nitrous acid. be sure to include…
$HNO_2(aq)$
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potassium and oxygen will react to form an ionic compound. part 1 of 2 …
Part 1: $K_2O$ Part 2: Potassium oxide
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determine the maximum number of electrons that can be found in each of …
Part 1 of 4: 2 Part 2 of 4: 10 Part 3 of 4: 6 Part 4 of 4: 14
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write the chemical formula for the ionic compound formed from the combi…
$MgS$
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ionization energy is the amount of energy required to remove one electr…
False
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write the molecular formula for dinitrogen pentoxide.
$N_2O_5$
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name each acid from its chemical formula. part 1 of 2 hcl(aq) part 2 of…
Part 1 of 2: Hydrochloric acid Part 2 of 2: Hypochlorous acid
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write the chemical formulas for the following molecular compounds: part…
Part 1 of 4: $P_2O_5$ Part 2 of 4: $NO_3$ Part 3 of 4: $NI_3$
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which of the following compounds are ionic? check all that apply. sf₂ h…
MgO
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k+ is bigger in size than ca2+ true false
True
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question 3: which of the following species, species (i) or (iii) shown …
B. Species (iii)
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question 2: what group of the periodic table contains alkaline earth me…
E. Group 2
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write the formula for the following ionic compounds: part 1 of 3 name e…
Part 1 of 3: $Rb_2O$ Part 2 of 3: $Co_2S_3$ Part 3 of 3: $FeSO_4$
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part 2 of 2 select the element(s). □br₂ □co₂ □nacl □no
Br₂
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several elements and compounds are given below. check all that apply. p…
$H_2O$, $CH_4$
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several elements and compounds are given below. check all that apply. p…
$\ce{H2O}$, $\ce{CH4}$
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classify each element as an alkali metal, alkaline earth metal, or neit…
Te: neither Na: alkali metal Fe: neither Ra: alkaline earth metal Ba: alkaline earth metal
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part 2 of 3 classify the element in period 2 and group 16. check all th…
Part 2 of 3: main - group element, nonmetal Part 3 of 3: Oxygen
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consider the element in period 2 and group 16. part 1 of 3 highlight th…
O
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indicate the number of protons, neutrons, and electrons in $_{29}^{65}c…
Part 1 of 3: 29 Part 2 of 3: 36 Part 3 of 3: 29
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drag the missing word into place i cant list every on the periodic tabl…
element
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give the number of protons and electrons in each of the following commo…
| ions | protons | electrons | | ---- | ---- | ---- | | $Al^{3 +}$ | 13 | 10 | | $H^{+}$ | 1 | 0 | | $I^{-}$ | 53 | 54 |
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the contains the larger subatomic particles, while the smaller particle…
nucleus
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drag the right word to its definition a pure chemical substance that ca…
Element
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write the isotope symbol for the following descriptions. part 1 of 2 wr…
Part 1: $_{42}^{98}Mo$ Part 2: $_{76}^{192}Os$
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which of the following is the proper technique for sterile compounding?…
Filter needles should be used when removing volume from a multi - dose vial.
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there are three sets of sketches below, showing the same pure molecular…
For 177 °C, choose the sketch with widely - spaced molecules (gas state). For 17 °C, choose the sketch with closely - packed but mobile molecules (liquid state). For - 21 °C, choo…
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which of the following factors can lead to precipitation of drug molecu…
B. pH
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the concentration of a solution may be expressed by all of the followin…
D. pH
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work knowledge, and logic to match the below the definition. on the lin…
Thermal
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which element has the electron configuration of 1s²2s²2p⁶3s²3p⁴?
Azufre (S)
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25 mn manganese 54.938 atomic # = atomic mass = mass number = # of prot…
# Explanation: ## Step1: Recall atomic number concept Atomic number is the number at the top of the element box. For Mn, it is 25; for K, it is 19; for F, it is 9. ## Step2: Recal…
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iodine 126.905 atomic # = atomic mass = mass number = # of protons = # …
**Iodine**: Atomic # = 53 Atomic Mass = 126.905 Mass Number = 127 # of Protons = 53 # of Neutrons = 74 # of Electrons = 53 **Argon**: Atomic # = 18 Atomic Mass = 39.948 Mass Numbe…
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16 s sulfur 32.06 atomic # = atomic mass = mass number = # of protons =…
Sulfur: Atomic # = 16 Atomic Mass = 32.06 Mass Number = 32 # of Protons = 16 # of Neutrons = 16 # of Electrons = 16 Magnesium: Atomic # = 12 Atomic Mass = 24.305 Mass Number = 24 …
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# of electrons = 35 5 b 10.81 atomic # = atomic mass = mass number = # …
Atomic # = 5 Atomic Mass = 10.81 Mass Number = 11 # of Protons = 5 # of Neutrons = 6 # of Electrons = 5
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atom a has an atomic number of 20 and mass number of 41. atom b has an …
Atom A has one more proton and one more electron than Atom B.
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question 19 this energy diagram shows the allowed energy levels of an e…
Ground state: E Number of lines in absorption spectrum: 6 Longest - wavelength transition: E to D Shortest - wavelength transition: E to C
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question 15 which of the following sets of quantum numbers is for the h…
Question 15: A. $n = 4,l = 3,m = 3$ Question 16: C. $n = 2,l = 0,m = 0$
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fill in the blank question a difference in chemical concentration, elec…
gradient
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the possible values for angular momentum quantum number, l, when n = 3 …
Question 12: c. 0, 1, 2 Question 13: a. 0 Question 14: c. 2
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which orbital is spherical in shape a.d b.p c.s d.f
C. s
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question 7 the impossible isotope is because a. $_1^1h$ b. $_{95}^{241}…
C. $_{9}^{4}Be$ because the atomic number and mass number are in the wrong positions and a mass number of 4 for beryllium is not possible.
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1 a) donnez le nom des groupes de mots entre crochets dans lextrait sui…
a) Groupes syntactiques (verbaux, adjectivaux, nominaux, etc.) b) Voir les noyaux de chaque groupe (par exemple, "poignée" dans "Une poignée de passionnés") c) Voir les éléments q…
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duncan v. louisiana: the ruling the supreme courts decision the supreme…
The Sixth Amendment can be incorporated; Duncan's conviction was overturned.
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2 dans les phrases suivantes, chaque mot en gras est le noyau dun group…
1) [Notre galaxie, la Voie lactée] est [un amas de milliards d'étoiles] (GN) (GN) 2) [Les savants de l'Antiquité] s'intéressaient déjà [à la Voie lactée] (GN) (Gprépo) 3) Ils voya…
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the number of electrons in the valence shell determine what types of bo…
True
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multiple choice question what causes dark adaptation? the chemical comp…
The chemical composition of the rods and cones changes as a result of the lighting changing.
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what is the name of the positively charged subatomic particle? multiple…
C. Proton
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certain ules\ of chemistry are used to simplify concepts when in fact s…
1. ion 2. isotope 3. atom 4. planetary 5. atomic
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select the single word in each sentence to make it correct. 1. in a cov…
1. nonpolar 2. sharing 3. charge 4. electrons 5. sharing
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classify the ph of each substance as acidic, neutral, or basic. labels …
Acidic: Milk, Lemon juice Neutral: Water Basic: Bleach, Oven cleaner, Egg white, Bread, coffee
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classify the ph of each substance as acidic, neutral, or basic. labels …
Egg white: Basic Milk: Acidic Wine: Acidic
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al₂(so₄)₃ express your answer in atomic mass units to two decimal place…
For $Al_2(SO_4)_3$, formula - mass = 342.17 amu For $(NH_4)_2Cr_2O_7$, formula - mass = 252.10 amu
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li₂o express your answer in atomic mass units to two decimal places. fo…
29.88 amu
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what is the main difference between robinsons \the man against the sky\…
D. "Mending Wall" has a strict rhyme scheme, while "The Man Against the Sky" does not.
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which statement best describes the rhyme schemes of the author to her b…
D. Bradstreet uses couplets for their overall rhyme scheme and structure, Wheatley uses couplets to enhance the poem as a song of praise for creation.
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gabriella stops into a convenience store to find a healthy snack and se…
check the bottle’s nutritional label to determine if all the ingredients are healthy
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what is the overall energy transformation in a coal - fired power plant…
chemical to electrical
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read the excerpt from \the author to her book\. \thou ill - formd offsp…
C. A, A, B, B
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open - ended questions: answer the following questions in complete sent…
Mass is the amount of matter and is constant; weight is the gravitational - force on an object and varies. Example: an astronaut's mass is same on Earth and in space but weight is…
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this passage describes a chemical reaction. read the passage. then, fol…
To solve this, we analyze the chemical reaction description: ### Step 1: Identify Reactants and Products In a chemical reaction, **reactants** are the substances that combine (or …
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check the box under each molecule in the table below that is an isomer …
Check the box under the first molecule (the one with a double - bond and two hydroxyl groups).
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this passage describes a chemical reaction. read the passage. then, ans…
B. sodium hydroxide (NaOH) C. hydrogen (H₂) D. chlorine (Cl₂)
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note: to answer some of the questions, it may help to reference a perio…
The isotope does not emit a form of radiation.
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a scientist is working with methane (ch₄) and butane (c₄h₁₀). which sta…
The statement "They are compounds made of the same two elements, but each contain different numbers of atoms." (the top - right boxed statement) best compares methane and butane.
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consider the reaction below. pcl₅(g)⇌pcl₃(g) + cl₂(g) at 500 k, the rea…
0.042
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the graph compares the rates of reaction of a burning candle and an exp…
The reaction that causes a firework to explode requires more energy to start, and occurs more rapidly than the reaction that causes a candle to burn. (The first option, as per the…
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acetic acid, an organic compound, has a structural formula. what is the…
$C_2H_4O_2$ (corresponding to the option with this formula, likely the fourth option shown as $C_2H_4O_2$)
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which statement best describes the relationship between activation ener…
Reducing the activation energy can increase the rate of a reaction.
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a scientist is conducting an investigation that involves water, silver,…
The group of statements: "They are each made of matter. Some are compounds and some are elements. They all contain atoms." (the second box from the top - left, or the one with tha…
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what are geometric isomers? compounds that have the same number of carb…
compounds that have the same atoms arranged in the same order, but with different three - dimensional orientations
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the molecular formula for methanol is ch₃oh. which model shows methanol…
The top - left model (the first model in the grid) shows methanol.
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which will increase the rate of a chemical reaction? decreasing the tem…
adding a catalyst
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what is a disadvantage of using a space-filling model to show a chemica…
Space - filling models do not identify the number and type of bonds.
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which reaction is exothermic? a reaction that requires an activation en…
a reaction that releases energy into the environment
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which states the difference between an alcohol and an ether? in an alco…
The first option (the one stating "In an alcohol, a carbon atom is single bonded to a hydroxide group ($\ce{OH^-}$); in an ether, an oxygen atom is single bonded to two carbon ato…
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which is a characteristic of a typical carbon atom? carbon has a high m…
Carbon can form single, double, and triple bonds.