Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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6) drag and drop the molecular shapes with the images. choices linear b…
First molecule: linear Second molecule: tetrahedral Third molecule: trigonal planar
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7) drag and drop the molecular shapes with the lewis structures. choice…
- PF₃: trigonal pyramidal - BeF₂: linear - CCl₄: tetrahedral
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1) choose the best answer. a(n)____structure is a two - dimensional dra…
B. Lewis ### Question 2
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3) choose the best answer. which structure represents a correctly drawn…
The second option: \( \boldsymbol{\text{H}-\stackrel{\boldsymbol{\cdot\cdot}}{\text{N}}-\text{H}} \) (with the lone pair on N and three single bonds to H)
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4) choose the best answer. the lewis structure for silicon dioxide (sio…
2 (corresponding to the option "2" among the choices)
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5) choose the best answer. how many lone pairs of electrons are present…
2 (corresponding to the option "2")
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6) choose the best answer. what is the central atom in this lewis struc…
nitrogen (the option with "nitrogen" as the text)
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8) use a periodic table to type in the correct answer for each blank. (…
For C: 4; For N: 3; For O: 2; For F: 1; For Ne: 0
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9. the correct chemical formula for hexaboron silicide is ◯ b₆si ◯ b₇si…
A. \( B_6Si \) (assuming the first option is A, second is B; if options are labeled differently, adjust accordingly, but based on the options given, the first option \( B_6Si \) i…
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6. the correct chemical formula for carbon disulfide is cs₂ c₂s₂ 7. the…
A. \( CS_2 \) ### Question 7
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2. the correct chemical formula for copper (ii) chlorite is cu(clo₂)₂ c…
\(Cu(ClO_2)_2\) (the first option) ### Question 3
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1. look at the two elements in each name. determine if they combine to …
a. Ionic ### 2. hexaboron silicide
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1) choose the best answer. which of these is not named correctly? mgo -…
C. \(Na_2S\) – sodium sulfate ### Sub - Question 2
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3) choose the best answer.which of these is the correct formula for alu…
B. \( \text{Al}_2\text{O}_3 \) ### Question 4
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5) choose the best answer. which of these is the correct formula for di…
D. $P_2O_5$ ### Question 6
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7) choose the best answer. what is the formula for the covalent compoun…
B. AtBr₃ ### Question 8
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9) choose the best answer. what is the formula for the covalent compoun…
D. $ClO_2$ ### Question 10
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what does tetra· mean? 1 2 3 4 19. choose the best answer. ____ compoun…
4 (the option with "4" as the text, assuming the options are numbered as 1, 2, 3, 4 with 4 being the correct one for the meaning of tetra - ) ### Question 19: ____ compounds conta…
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16. choose all that apply. the crystalline lattice structure of ionic c…
- strong bonds - high melting points - brittleness ### Question 17
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14. choose the best answer. what is used to represent the simplest chem…
A. formula unit ### Question 15
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12. choose the best answer. when two nonmetals form a bond, they create…
D. covalent ### Question 13
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10. choose all that apply. due to low intramolecular forces, most coval…
A. gases, B. liquids ### Question 11
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8. choose all that apply. which two are organic compounds? ch₃ h₂o c₆h₁…
$\boldsymbol{\ce{CH3}}$, $\boldsymbol{\ce{C6H12O6}}$ ### Question 9
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7. choose the best answer. which highlighted part in the picture repres…
blue
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5. choose the best answer. _____ compounds typically do not contain car…
B. Inorganic ### Question 6
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3. choose the best answer. molecular formulas show the actual ___ of at…
C. number ### Question 4
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1. choose the best answers. chemical nomenclature is a(n)_____used to n…
B. system ### Question 2
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1) choose the best answer. which of these is an organic compound? h₂o c…
B. \(C_6H_{12}O_6\)
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2) choose all that apply. which two are inorganic compounds? naf h₂o ch…
$\ce{NaF}$, $\ce{H2O}$ ### Question 3
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4) choose the best answer. which of these is not matched correctly? tet…
B. hepta = 9 (assuming the options are labeled as A. tetra = 4, B. hepta = 9, C. tri = 3, D. hexa = 6) ### Question 5
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6) drag and drop the words with the descriptions. a formula that shows …
1. a formula that shows the simplest ratio of atoms in a compound: empirical formula 2. a formula that shows the actual number of atoms in a compound: molecular formula 3. a numbe…
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the vapor pressure of water at 80°c is 0.468 atm. calculate the vapor p…
Vapor pressure in mmHg: \( 356\ \text{mmHg} \) Vapor pressure in torr: \( 356\ \text{torr} \)
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when the gases dihydrogen sulfide and oxygen react, they form the gases…
\(128\space g\)
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ionization energy choose the element with the higher first ionization e…
To solve for the element with the higher first ionization energy in each pair, we use the trend of ionization energy in the periodic table: ionization energy generally increases f…
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an increase in concentration of reactants will: a. increase the rate of…
A. Increase the rate of reaction
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in a reaction, a catalyst will: a. increase the temperature of the syst…
D. Lower the activation energy
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consider a reaction where the reactants are at room temperature, and th…
A. It is endothermic.
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the diagram below shows four tubes with gas molecules floating in them.…
D. IV
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which of the following factors does not alter the rate of reaction? a. …
A. Color
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how much energy will it take to raise the temperature of 75.0 g of wate…
D. \(1.1\times10^{4}\ J\)
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according to collision theory, what is not a factor that determines if …
C. The specific heat of the molecules.
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a chemist measures the energy change, delta h, during the reaction: c3h…
$277.5\ kJ$
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4. the following steps are involved in a reaction: (fast) 1. ( cl_{2(g)…
a) The rate - determining step is \(CHCl_{3(g)}+Cl_{(g)}\to HCl_{(g)}+CCl_{3(g)}\) b) The overall reaction equation is \(Cl_{2(g)}+CHCl_{3(g)}\to HCl_{(g)}+CCl_{4(g)}\) c) The rat…
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which container shown here has the smallest partial pressure of ar and …
Container \(c\) has the smallest partial pressure of \(Ar\) because the mole - fraction of \(Ar\) (number of \(Ar\) particles divided by total number of particles) is smaller in c…
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which of these is the most persistent (stays the longest) in the enviro…
DDT and other chemicals like it
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there are several chemicals that can last for a very long time in an en…
DDT
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how did the clean water act affect the handling of chemicals by industr…
C. It eliminated the practice of dumping waste chemicals into rivers and streams.
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what should you add to your ecocolumn if you want to test the effects o…
C. inorganic fertilizer
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viruses, bacteria, and parasitic worms found in water that cause diseas…
C. infectious agents
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ppb stands for: parts per buffer parts per bluff parts per billion part…
C. parts per billion
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3. the following data was obtained for the reaction: a_{(g)} + b_{(l)} …
a) The experimental rate law is \(\text{Rate}=k[A]^2[B]\) and the overall order of the reaction is \(3\). b) The specific rate constant \(k = 2\space L^2/mol^2\cdot s\). c) The ra…
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question 12 (1 point) explosive reactions have a high activation energy…
The first diagram.
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what type of smog is often seen in urban areas due to secondary polluta…
photochemical smog
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match the labels with the correct quantities by examining the diagram a…
\(E_4 - E_3\): 6. enthalpy change, reverse reaction; \(E_1 + E_2\): 2. \(Ea(rev)\), uncatalyzed; \(B\): 4. activated complex, uncatalyzed reaction; \(C\): 8. products; \(E_3 - E_4…
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match the term with the correct definition below: a system that can exc…
1. thermochemistry - the study of the energy changes involved in chemical and physical processes 2. endothermic - describes the process during which heat enters a system 3. specif…
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question 24 (1 point) examine the figure below: which letter represents…
A.
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page 1: question 24 (1 point) examine the figure below: page 2: page 3:…
A. A
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question 24 (1 point) examine the figure below: which letter represents…
A. A
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question 23 (1 point) a reaction has the following rate law: r = ka^2b^…
The rate would quadruple.
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question 22 (1 point) fatima is studying the following reaction: 2 nh₃(…
\(r = k[NH_3]^2\)
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a student makes a graph of initial rate vs. concentration in order to d…
a curved line showing an increase in rate with concentration
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#3 previous page next page page 3 of 5 question 20 (1 point) a student …
a straight line beginning at the origin and gradually increasing
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question 19 (1 point) examine the figure below for the following questi…
D
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question 18 (1 point) examine the figure below for the following questi…
none of the above
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examine the figure below for the following question:which letter repres…
A.
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unit test #3 examine the figure below for the following question: which…
D.
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unit test #3 question 16 (1 point) examine the figure below for the fol…
C.
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if we draw a potential energy diagram for an endothermic reaction, the …
less than potential energy of product
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question 14 (1 point) consider the following activation energy diagram.…
A. increase, higher
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2. consider the reaction c + d → cd. the (ea_(fwd)) is +65.0 kj and the…
$\Delta H^{\circ}_{r}=-85.0\ kJ$
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question 13 (1 point) if a positive catalyst is added while a reaction …
Rate of reaction increases.
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question 12 (1 point) explosive reactions have a high activation energy…
The first potential energy diagram (with \(E_{a}(fwd)\), \(E_{a}(rev)\), \(\Delta_{m}H\) labeled correctly and product energy lower than reactant) is the correct one for explosive…
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question 11 (1 point) the rate of a chemical reaction is doubled for ev…
increase in the number of effective collisions
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question 10 (1 point) a lab technician places some peanut butter into a…
91.0 kJ
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question 9 (1 point) a 3.25 g piece of gold is cooled from 20.5°c to 13…
2.81 J
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question 9 (1 point) a 3.25 g piece of gold is cooled from 20.5°c to 13…
2.80 J
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question 8 (1 point) 6.28 10^5 j of heat is supplied to raise the tempe…
1.99 kg
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unit test #3 question 6 (1 point) use the following information to answ…
3402 J
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question 5 (1 point) sulfur dioxide can be prepared by heating its cons…
A. $S_8(\ell)+8O_2(g)\to8SO_2(g)$ $\Delta H=-2x$ kJ
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question 4 (1 point) when 6.000 moles of glucose are combusted, 16 815 …
\(C_{6}H_{12}O_{6}(s)+6O_{2}(g) ightarrow6CO_{2}(g)+6H_{2}O(l)\), \(\Delta H=-2802.15\) kJ (the fourth option)
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question 3 (1 point) the enthalpy of formation of an element in its mos…
zero
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question 2 (1 point) a solid sample of granite, mass 200 g, is cooled s…
\(28.7^{\circ}C\)
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question #14 the transfer of heat from one object to another through to…
- Question #14: C. conduction - Question #15: C. the sun - Question #16: A. cohesion
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question #12 what is the reason some of the earths energy received from…
A. It is reflected by clouds and the earth's surface # Question 13
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sch4u -- unit d -- unit test part 1 question 1 (1 point) use the follow…
478 kJ
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11/20/25, 8:21 am gr6 science 4.5 benchmark 25/26 name: class: date: qu…
Temperature of water: Independent Variable Amount of sugar dissolved: Dependent Variable
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what does sound need in order to propagate (move)? what happens to soun…
1. Sound needs a medium (solid, liquid, or gas) to propagate. 2. As molecules get more dense or closer together, the speed of sound generally increases (because energy transfer be…
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5. for the reaction below, initially 3.5 mol of nh, are placed in a 4.0…
a. \(0.16\ mol/(L\cdot min)\) (rounded to two significant figures) b. \(0.24\ mol/(L\cdot min)\) (rounded to two significant figures) c. \(0.20\ mol/(L\cdot min)\) (rounded to two…
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big idea/ learning goal i can describe the collision theory. i can desc…
A catalyst lowers the activation energy of a reaction. According to collision theory, this means more reactant particles have enough energy to collide effectively (i.e., with suff…
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consider the following activation energy diagram. from the above activa…
A. increase, higher
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question 13 (1 point) if a positive catalyst is added while a reaction …
Rate of reaction increases.
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which is the larger species in each pair? a. li or li+ b. i^- or cs^+ c…
### Part a: Li or \( \text{Li}^+ \) # Explanation: ## Step1: Analyze electron configuration Li has an electron configuration of \( 1s^2 2s^1 \), while \( \text{Li}^+ \) has lost i…
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which is the larger species in each pair? a. li or li+ b. i^{-} or cs+ …
To determine the larger species in each pair, we analyze the electron configuration and the effect of charge on atomic/ionic radius: ### Part a: $\boldsymbol{\ce{Li}}$ or $\boldsy…
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question 7 (1 point) consider the potential energy diagram below, which…
C. B and C
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explosive reactions have a high activation energy and explosive substan…
The first potential energy diagram (the one with \(E_a(\text{fwd})\), \(E_a(\text{rev})\), and \(\Delta_n H\) labeled, where reactants are at higher PE than products and a large a…
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question 11 (1 point) the rate of a chemical reaction is doubled for ev…
D. increase in the number of effective collisions (Note: Assuming the options are labeled A - E, with this as the correct one. If original labels differ, adjust, but the content i…
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question 5 1 pts the newly formed hybrid orbitals _______ the number of…
equals
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question 3 1 pts hybridized orbitals form _________after electrons are …
covalent bonds
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which of the following gases would you expect to move the fastest at 25…
\( \text{N}_2 \) (the option with \( \text{N}_2 \))
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question 6 (1 point) consider the potential energy diagram below, which…
A. A - B