化學
化學反應、化學計量、分子結構與元素性質。
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question 7 of 12 which of the following rules apply to the safety data …
A. Employers must keep an SDS for each hazardous chemical at the workplace. B. The SDSs may be kept in paper or electronic format. D. Employees must be able to access the SDSs dur…
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question 6 of 12 according to the hazcom standard, employers who have h…
A. Identify and maintain an inventory of all hazardous chemicals in the workplace. B. Develop a written hazard communication program. C. Ensure all hazardous chemicals are properl…
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question 10 of 10 which of the following describe hazards that can be p…
A. Falling or rolling objects B. Objects that could pierce the sole of a normal shoe C. Electrical hazards E. Hazardous chemicals that could splash or spill
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mod ul exam quiz question index time remaining: 00:45:30 23-dec-2025 11…
A) Separate from food ingredients
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a chemical food - borne illness can be caused from eating food containi…
D) All of the above
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according to le chateliers principle, a system in chemical equilibrium …
A. reduces the stress.
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consider the balanced equation below. pcl₃ + cl₂ → pcl₅ what is the mol…
1:1 (corresponding to the option "1:1")
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consider the following chemical reaction of bromothymol blue indicator.…
A. The solution will remain yellow.
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the chemical equation below shows the formation of aluminum oxide (al₂o…
182 grams
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which set correctly orders the atoms from highest to lowest ionization …
Ar > S > P > Al (the third option, assuming the options are presented as: 1. Ar > Al > P > S, 2. S > P > Al > Ar, 3. Ar > S > P > Al, 4. Al > P > S > Ar)
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what is the correct formula that would result from the combination of t…
$\boldsymbol{(NH_4)_2SO_4}$ (corresponding to the option: (NH₄)₂SO₄)
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c₂h₅oh + 3o₂ → 2co₂ + 3h₂o + 1367 kj what is the mole ratio between wat…
2
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how many moles of cl₂ are in a container with a volume of 7.5 l at stp?
Approximately \( 0.335 \) moles (or more precisely \( \frac{7.5}{22.4}\approx0.335 \) mol)
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energy diagram energy reaction progress what does line c represent? tra…
enthalpy of reaction
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the mass and volume of each sample differ from the mass and volume of t…
Yes, if each sample contains \(6.02\times 10^{23}\) atoms. (The option corresponding to this statement, e.g., the third option in the list: "Yes, if each sample contains \(6.02\ti…
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what is the relationship between a mole and avogadros number? a mole is…
C. A mole contains Avogadro’s number of particles of a substance.
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according to le chateliers principle, what happens when the concentrati…
A. The equilibrium shifts to the right to favor the formation of products.
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consider the substances below. - 1 mol of beryllium - 1 mol of salt - 1…
They have different masses. (The correct option is the one stating "They have different masses.")
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which statement best describes how dynamic equilibrium relates to a sat…
C. Each second, the amount of solid sodium chloride that dissolves equals the amount of solid sodium chloride that recrystallizes.
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which is true about reaction rates? ○ high reaction rates occur only in…
D. Reaction rates are not related to spontaneity.
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name of the student: date: period: name of ionic compound formula 1. al…
To determine the formulas of these ionic compounds, we use the principle of charge balance: the total positive charge from cations equals the total negative charge from anions. ##…
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questions 1. what is a compound? a. a mixture of elements b. a substanc…
c. A substance formed when elements chemically combine ### Question 2
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interpreting indicators ph range evan tests the ph of a liquid using ca…
between 9 - 13
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how is a solution with ph 4 related to a solution with ph 5? the ph 4 s…
The pH 4 solution has 10 times as much $\text{H}^+$ as the pH 5 solution.
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which of these terms describes ethylamine, ch3ch2nh2? weak acid weak ba…
weak base
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acids have a ph below 7 and taste sour. which of the following is anoth…
B. are corrosive to most metals
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the reaction shifts to the left (reactants). what happens to the amount…
The amount of HI goes down.
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which direction does this reaction shift when i₂ is removed? 51.8 kj + …
The reaction shifts left or to reactants.
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the reaction shifts to the right (products). what happens to the amount…
The amount of NO goes down.
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which direction does this reaction shift when o₂ is added to the soluti…
The reaction shifts right or to products.
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which of these is a condition for dynamic equilibrium? the reaction mus…
The reaction must be reversible (can go forward and backward).
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which statement about catalysts is true? catalysts increase the activat…
C. Catalysts are not used up during the reaction.
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each solute is dissolved in 1 l of solvent. which solution will exhibit…
0.5 moles AlN (dissociates into 2 particles)
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what is the final concentration of 925 ml of a solution made from 222 m…
\( 1.08 \)
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we wish to determine how many grams of $\\ce{ag_{2}cro_{4}}$ precipitat…
\(12.44\) grams (or more precisely, \(0.0375\times331.74 = 12.44025\) which can be rounded to \(12.4\) or \(12.44\) depending on significant figures)
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we wish to determine how many grams of solid ag₂cro₄ will precipitate w…
$0.0750$ moles (The calculation is $0.500\times0.150 = 0.0750$)
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how many moles of nacl are in 0.50 l of a 3.0 m solution? m = \\frac{mo…
\( 1.5 \) moles
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of the following conditions, which will cause the reaction rate to be t…
C. 20 °C, large particles, no stirring (assuming the third option is labeled C; if original labels differ, adjust to match, e.g., if third option is the last one, state its text w…
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what term describes the electrolyte capacity of sulfuric acid, which fu…
B. strong electrolyte
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which term describes the process by which liquid molecules form gases b…
vaporization
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which of the following is not a property of a metallic solid? amorphous…
A. amorphous
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what intermolecular forces can co₂ exhibit with similar molecules? o=c=…
A. only dispersion forces
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2c₂h₂(g) + 5o₂(g) → 4co₂(g) + 2h₂o(g) how many liters of c₂h₂ will reac…
107.52
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what volume does 4.53 moles of hydrogen at 1.78 atm and 301 k occupy? ?…
\( 62.9 \) (rounded to three significant figures, or depending on precision requirements, the value is approximately \( 62.9 \) L)
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a flexible container holding 1.25 moles of a gas contracts from 25.0 l …
\(0.5\)
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a flask contains argon, helium, and fluorine gases. the partial pressur…
34.9
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limiting reactants grilled cheese consider the following recipe for gri…
mayonnaise
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how many grams of pbso₄ would be produced from the complete reaction of…
\( \approx 59.8\ \text{g} \)
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2al + 3cl₂ → 2alcl₃ how many grams of aluminum will react fully with 1.…
\(22.5\) (or more precisely \(22.48\))
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how many moles of pb(no₃)₂ are required to generate 12 moles al(no₃)₃? …
18
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c₂h₅oh + 3o₂ → 2co₂ + 3h₂o + 1367 kj what is the mole ratio between wat…
3
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which of the following is the correct way to describe the ratio of volu…
A. \( 2 \, \text{L NH}_3 : 1 \, \text{L N}_2 : 3 \, \text{L H}_2 \)
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a compound has the empirical formula given below. c₂h₆o which compound …
\( \text{C}_6\text{H}_{18}\text{O}_3 \) (the third option, \( \text{C}_6\text{H}_{18}\text{O}_3 \))
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how many formula units (f.un.) are in 35.0 g kno₃? (1 mol kno₃ = 101.11…
Coefficient (green): \( 2.08 \) (or more precise \( 2.083 \)), Exponent (yellow): \( 23 \) So the answer is \( \boldsymbol{2.08}×10^{\boldsymbol{23}} \) f.un. \( \text{KNO}_3 \) (…
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what is the molar mass of this compound? nh₃ remember to round to the h…
17.03 g/mol
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how many nitrogen atoms are present in one mole of dinitrogen pentoxide…
1.20 x 10²⁴ atoms
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how many nitrogen atoms are present in one molecule of dinitrogen pento…
2 atoms (the option with "2 atoms")
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how many atoms of sn are present in 7.6 moles of tin? 4.6×10²⁴ atoms sn…
A. \( 4.6 \times 10^{24} \) atoms Sn
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what is the name of this ionic compound? na₂so₃ sodium sulfur oxide sod…
B. Sodium sulfite
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what is the name of this ion? $\\ce{c_{2}h_{3}o^{-}_{2}}$ options: hydr…
B. acetate
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which of the following is not a multivalent ion? ag⁺ sb⁵⁺ cu⁺ cr³⁺
\( \text{Ag}^+ \) (the option with \( \text{Ag}^+ \))
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name the following ionic species. naf sodium monofluorine sodium monofl…
D. sodium fluoride (assuming the last option is labeled D; if the options are labeled differently, adjust the identifier, e.g., if the last option is A, then A. sodium fluoride)
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what is the correct formula for aluminum phosphide? al₃p₃ alp al₅p₃ pai
B. AlP (assuming the second option is labeled B, with text "AlP")
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how many protons, neutrons, and electrons are in this ion? $\\ce{_{80}^…
80 p⁺, 124 n⁰, 78 e⁻ (the last option: 80 p⁺, 124 n⁰, 78 e⁻)
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what type of elements are present in a metallic bond? only non - metal …
only metallic elements
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which element will form the ion with the smallest ionic radius? periodi…
B
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which element will form the ion with the largest ionic radius? periodic…
Cs (the element is Cesium, and among the options, the correct one is the middle option labeled "Cs")
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which element will have the largest atomic radius? periodic table with …
D. francium (Fr)
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which state of matter is associated with most metal elements? liquid ga…
solid
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which of these elements is a transition metal? barium magnesium mercury…
mercury
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how many valence electrons are in gallium? ia iia iiia iva va via viia …
3
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the electron configuration of phosphorous is $1s^2 2s^2 2p^6 3s^2 3p^3$…
D. \([Ne] 3s^2 3p^3\) (assuming the last option is D, as the options are: A. \([He] 3s^2 3p^3\), B. \([Ne] 3s^2\), C. \([He] 2s^2 2p^6 3s^2\), D. \([Ne] 3s^2 3p^3\))
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1 2 3 4 5 6 7 8 1 1 h 2 he 2 2 li 4 be 5 b 6 c 7 n 8 o 9 f 10 ne 3 11 n…
The correct Bohr model for boron (B) is the third model (assuming the options are labeled, e.g., if the third model is option C, then C. [Description of the third model]). But bas…
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a metathesis is a double displacement. true false
True
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how many elements are replaced in a displacement reaction? two one
one
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a chemical reaction is any process that causes atoms to be ______. ○ cr…
modified
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agno₃ + nacl → agcl + nano₃ is an example of: a metathesis reaction a d…
a metathesis reaction
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adriana performed a chemistry experiment in which she divided 1/2 of a …
$\frac{1}{10}$
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. \(2F_2(g)+O_2(g) ightarrow2OF_2(g)\)
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. \( \ce{2F_{2}(g) + O_{2}(g) -> 2OF_{2}(g)} \)
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. \( \ce{2 F2(g) + O2(g) → 2 OF2(g)} \)
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. \(2 F_2(g) + O_2(g) ightarrow 2 OF_2(g)\)
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. \( 2F_2(g) + O_2(g) ightarrow 2OF_2(g) \)
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. \( \ce{2 F2(g) + O2(g) → 2 OF2(g)} \)
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. \( \ce{2 F2(g) + O2(g) → 2 OF2(g)} \)
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. \( \ce{2 F2(g) + O2(g) → 2 OF2(g)} \)
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5. why does electronegativity increase when you move from left to right…
C. The number of protons in the nucleus increases. ### Question 6
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3. which element will have the smallest atomic radius? * ○ na ○ ca ○ ti…
Ti (Titanium) ### Question 4
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1. what is the name for an atoms ability to strongly pull an electron t…
D. Electronegativity ### Question 2
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where should we measure the volume of this graduated cylinder? at the 2…
at the bottom of the meniscus
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the calibration is to 1 ml, so we estimate another digit. what is the v…
67.4 mL
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what is the calibration of this graduated cylinder? calibration = (diff…
1 mL
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a swing can go back and forth. what kind of energy is shown here? kinet…
A. kinetic energy
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what term do environmental scientists use to describe the increased con…
B. biomagnification
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which pesticides are the most persistent? chlorinated hydrocarbons bota…
Chlorinated hydrocarbons
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question 2. a solid sample of copper is an excellent conductor of elect…
Metallic bonds (the option with "Metallic bonds" text)
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what was j.p. morgans profession? □ producer □ banker □ railroad owner …
B. Banker
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swyk: bonding and molecular propert bond involves elements that share e…
First blank: Covalent Second blank: Nonmetal Third blank: Outer Fourth blank: Octet
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match the compound to the type of bond. agcl nh₃ h₂o bao ionic bond cov…
\(AgCl\) - ionic bond; \(NH_3\) - covalent bond; \(H_2O\) - covalent bond; \(BaO\) - ionic bond
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swyk: bonding and molecular properti which of the following is a proper…
C. conductive when dissolved in water