化学
化学反応、化学量論、分子構造、元素の性質。
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question 7 what do the letters in the center of each square on the peri…
The element's symbol
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chemicals should be the last resort. the first step in ipm is monitorin…
It should only be used as the last resort.
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the states that each electron occupies the lowest energy orbital availa…
Aufbau principle
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why is it helpful for engineers to understand the periodic table? it he…
It helps them pick the right materials for specific jobs.
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introduction to electron configuration 10 de 12 orbital \d\ can occupy …
# Explicación breve: En la configuración electrónica, el orbital "d" tiene una capacidad máxima de 10 electrones, no 6. # Respuesta: B. False
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the describes the electrons probable location. energy sublevel atomic o…
atomic orbital
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the third energy level has three sublevels and can occupy a maximum of …
B. False
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one orbital can occupy a maximum of ______ electrons. 4 2 3 1
2
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the arrangement of electrons in an atom is called the ____________. ele…
electron configuration
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introduction to electron configuration 5 of 12 orbital \p\ can occupy 6…
True
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introduction to electron configuration 4 of 12 the first energy level o…
True
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the states that a maximum of two electrons can occupy a single atomic o…
Pauli exclusion principle
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introduction to electron configuration 2 of 12 orbital \s\ can occupy 2…
True
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introduction to electron configuration 1 of 12 the lowest allowable ene…
ground state
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21. use hesss law to calculate the enthalpy change, \\( \\delta h \\), …
A. -238.7 kJ/mol
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20. a 44.0 g sample of an unknown metal at 99.0°c was placed in a const…
C. \(0.474\ J/g^{\circ}C\)
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read the excerpt from act 1, scene 7 of the tragedy of macbeth. macbeth…
By reasonably weighing the opportunities and obstacles, she shows that her assassination scheme is sensible.
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19. when 0.1375 g of solid magnesium is burned in a constant - volume b…
D. -602 kJ/mol
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question 5 50.00 ml of a 0.200 m solution of sucrose is diluted to 500.…
0.0200 M
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18. ethylene glycol, the main component of automotive engine coolant, h…
E. \(1.41\times 10^{5}\ J\)
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question 4 if you measured out 0.200 moles of nacl, and dissolved it in…
$0.400$ M
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question 3 a volumetric flask contains 250.00 ml solution. what is the …
C. \(0.25000L\)
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question 1 in a solution made by dissolving nacl in water, the solute i…
NaCl
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question 1 in a solution made by dissolving nacl in water, the solute i…
0.428 mol
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what is the main reason for farmers to use pesticides? to increase the …
to increase food production and minimize losses
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17. determine the amount of heat, in kj, given off when 1.26 × 10⁴ g of…
A. \(3.43\times 10^{4}\space kJ\)
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16. given: h₂(g) + ½o₂ (g) → h₂o(l) δh°f = -286 kj what is the enthalpy…
D. \(\Delta H^{\circ}= + 572\space kJ\)
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15. a gas expands in volume from 26.7 ml to 89.3 ml at constant tempera…
D. -9.5 J
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are located in the nucleus, or center, of every atom. a electrons and n…
B. Protons and neutrons
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chemists and physicists tell us that all matter in the universe is comp…
elements
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30. which of the following pairs of elements is most likely to form an …
C. Sodium and chlorine
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all natural and man-made elements are listed in a special chart called …
D. periodic table
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26. which of the following elements behaves the most like the team pull…
- 26. F. F - 27. C. Shared unequally between atoms, causing partial charges - 28. B. Dinitrogen pentoxide - 29. C. Metallic bond
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read the passage and use the diagram to answer the next question. the f…
A. one; seven
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23. organic chemists identified four different liquids of varying volat…
23. B. \(I<II<III<IV\) 24. D. Liquid 4: \(CH_3CH_2CH_2CH_3\)
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21. select the answer that shows the words in the correct order to comp…
21. B. electrons; valence 22. D.
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atoms of every element are composed of smaller particles called _______…
A. neutrons, protons, and electrons
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the atomic number of each element indicates how many ________ and _____…
A. electrons and protons
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18. which of the four elements is most likely to form cations in its re…
18. C. Mc 19. A. have seven shells of electrons 20. D. It would most likely form cations when it reacts.
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17. which list of symbols, in order from left to right, correctly compl…
A. Se; Na; Na; Ar; O
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14. which list arranges the elements na, li, k, rb, and cs in order of …
14. A. Cs; Rb; K; Na; Li 15. D. 8 16. D. number of elements in a group
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12. which arrangement of the following period 5 elements, from left to …
C. Te; Sb; In; Sr; Rb ### Question 13
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9. a mystery element has 18 protons. which one of the following stateme…
B. The element belongs in row 3 of the periodic table and is classified as a noble gas.
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9. a mystery element has 18 protons. which one of the following stateme…
B. The element belongs in row 3 of the periodic table and is classified as a noble gas. ### 10.
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9. a mystery element has 18 protons. which one of the following stateme…
B. The element belongs in row 3 of the periodic table and is classified as a noble gas. ### Question 10
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in this performance task you will answer two questions. the electron co…
7. B. Atom X = 1; Atom Y = 7 8. C. 17
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read the passage and use the diagram to answer the next question. durin…
A. Ca, it belongs to Group 2
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calculate the molar mass for al(oh)3 with four significant figures. 1) …
3) \(78.00\space g/mol\)
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periodic table high school reference sheet considering particles at the…
quickly
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2. based on the periodic table, which other element is likely to share …
2. B. Cs 3. D. They have 4 valence electrons. 4. B. 2, 8, 18, 7
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the main focus of sustainable agriculture is: maintaining long - term l…
maintaining long - term land productivity
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question 42 where is the highest concentration of organic matter in a s…
At the top
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electricity day 5 checkpoint test 1. chemists and physicists tell us th…
1. Elements 2. D. neutrons, protons, and electrons 3. D. Protons and neutrons 4. F 5. B. too many 6. C. electrons and protons 7. A. periodic table 8. A. magnetism is created
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hydrogen peroxide can be used to disinfect and clean surfaces around th…
- For the number of H atoms: \(8\) - For the number of O atoms: \(8\) - For the number of \(H_2O_2\) molecules: \(4\)
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there is no oxygen in space for humans to breathe, so, astronauts livin…
For the table: - \( H \): \( 24 \) - \( O \): \( 12 \) For the number of water molecules: \( 12 \)
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periodic table high school reference sheet based on their definitions, …
B. ionization energy
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sulfuryl chloride is a substance used to make chemicals for killing ins…
O: 8; S: 4; Cl: 8; 4 molecules of \(SO_2Cl_2\) react.
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ethanol is a chemical that is used in many hand sanitizers. it is produ…
- For \(H\): \(28\) - For \(C\): \(8\) - For \(O\): \(4\) - Molecules of ethanol: \(4\)
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periodic table high school reference sheet the elements k, ca, se, kr, …
\(K>Ca > Ga>Se > Kr\)
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periodic table high school reference sheet lithium is in group 1a, peri…
B. It forms a cation with a +1 charge.
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periodic table high school reference sheet which of the following corre…
C. smaller, larger
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4 - making messages easy to remember learning objective: explain how to…
C. Allen is teaching a class on computers and explains how they work by focusing on three areas: hardware, software, and networks.
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ammonia is commonly used as a fertilizer for plants. it is made when ni…
- For the number of \(H\) atoms: \(18\) - For the number of \(N\) atoms: \(6\) - For the number of \(NH_3\) molecules: \(6\)
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in the atmosphere, nitric oxide forms when a lightning strike causes ni…
| Chemical element | Number of atoms in the reaction | | ---- | ---- | | N | 6 | | O | 6 | The number of molecules of nitric oxide (NO) produced is 6.
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phosgene is a substance that is often used to make the padding found in…
| Chemical element | Number of atoms in the reaction | |--|--| | \(C\) | \(3\) | | \(O\) | \(3\) | | \(Cl\) | \(6\) | The number of molecules of phosgene \((COCl_2)\) produced is …
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question 15 what is salt wedging? a form of physical weathering where s…
A. A form of physical weathering where salt crystals growing in cracks pushes grains apart, widening the cracks over time.
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when carbon dioxide gas dissolves in water, it reacts with the water to…
D > B > C > A
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in the laboratory, hydrogen gas of good purity can most easily be obtai…
A \(>\) B \(>\) C \(>\) D
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iron ore is reduced to pure iron by smelting, during which the iron (ii…
D (1), A (2), C (3), B (4)
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most of the coal available in the united states is bituminous or \soft\…
A, D, B, C
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much of the sulfur used in the united states comes from the hydrogen su…
\(C > B> D > A\)
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5. analyze: how does the atomic radius change across a period of the pe…
The atomic radius decreases across a period of the periodic table.
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coal gasification produces an easily - transportable, clean - burning c…
A (with the highest temperature of \(390.^{\circ}C\)) will have the highest initial reaction rate. Then comes C (\(380.^{\circ}C\)), followed by D (\(370.^{\circ}C\)), and B (\(36…
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1. the number of atoms in 2.0 mol of al is a. 2.0 al atoms b. 3.0 x 102…
1. C. \(1.2\times 10^{24}\text{ Al atoms}\) 2. B. \(3.0\text{ mol of S atoms}\)
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question 4 2 pts which of the following statements is false regarding l…
They are rich in organic matter.
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question 5 what does the atomic number of an element tell you? the colo…
The number of protons in the nucleus
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which statement is always true for samples of atomic elements, regardle…
A. If two samples of different elements contain the same number of atoms, they contain the same number of moles.
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question 5 (1 point) looking at the c - c bonds in each of the structur…
D. Bond length decreases; Bond strength increases
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question 4 (1 point) what is the total electron valence count for h₃po₄…
\(32\)
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question 3 (1 point) what is the electron geometry and molecular geomet…
D. Electron geometry: tetrahedral, Molecular geometry: trigonal pyramidal
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question 2 (1 point) how many regions of electron density does the nitr…
A. 4
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question 1 (1 point) how many regions of electron density does the carb…
3
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below the symbol, you may see the element name and the atomic mass, com…
To organize them by atomic number and similar properties
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they are decorative elements. question 3 why do engineers use different…
Because elements have different properties.
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patterns formed in columns and rows. question 2 why are metalloids show…
They share properties with both metals and nonmetals.
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directions answer the following questions about what you just learned i…
Patterns formed in columns and rows.
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the charges and sizes of the ions in an ionic compound affect the stren…
Highest lattice energy: \(MgO\), then \(MgF_2\), then \(NaF\), Lowest lattice energy: \(KCl\)
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identify the type of bonding within each substance. co(s) covalent meta…
- \(Co(s)\): metallic - \(CoCl_{2}(s)\): ionic - \(CCl_{4}(l)\): covalent
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what element forms an ion with an electronic configuration of ne and a …
\(O\)
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what element forms an ion with an electronic configuration of $1s^{2}2s…
\(Se\)
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write the full ground state electron configuration of o+.electron confi…
electron configuration: \(1s^{2}2s^{2}2p^{3}\) neutral atom: \(N\)
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what is the ph of a solution of 0.400 m ch₃nh₂ containing 0.250 m ch₃nh…
\(12.12\)
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what ratio of nacn to hcn is needed to prepare a ph 10.10 buffer? (kₐ o…
The ratio of $[NaCN]$ to $[HCN]$ is approximately $6.2$.
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what is the ph of a buffer made from 0.130 mol of hcno (kₐ = 3.5 × 10⁻⁴…
\(3.96\)
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consider the set of successive ionization energies. ie₁ = 589.8 kj/mol …
Ca
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6) azurite is a copper containing mineral that is a mixture of copper(i…
\(x = 2,y = 1\)
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determine whether k or rb that has the more negative (more exothermic) …
- K - O - Si - Cl
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determine the $k_{a}$ if the $pk_{a}$ is 5.21.
\(6.17\times 10^{-6}\)
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arrange these ions according to ionic radius. largest radius smallest r…
Largest radius: \(N^{3 -}\), then \(O^{2 -}\), then \(F^{-}\), then \(Na^{+}\), Smallest radius: \(Mg^{2+}\)
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what is one reason why producing leather has a larger carbon footprint …
Cattle emit large amounts of methane during digestion.