化学
化学反应、化学计量、分子结构与元素性质。
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gen atom will gain 3 valence electrons when forming the ion. look on th…
Nitride; \(N^{3-}\)
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12. the nitrogen atom will gain 3 valence electrons when forming the io…
Name of the ion: Nitride ion Formula of the ion: $\text{N}^{3-}$
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level 5 q1 ns of ¹⁶o, ¹⁷o, and ¹⁸o have the number of? erotons, but a d…
C. Protons, but a different number of neutrons
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atoms of 16o, 17o, and 18o have the same number of? protons, but a diff…
C. Protons, but a different number of neutrons ### For the second question (neutral atom to positive ion, though options are cut off, typical logic: positive ion is formed by losi…
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chemistry: nomenclature for ionic compounds section i: write the name o…
1. Calcium Phosphide 2. Magnesium Phosphate 3. Potassium Nitrate 4. Aluminum Chlorite 5. Lithium Tetraborate 6. Titanium(III) Sulfite 7. Nickel(IV) Fluoride 8. Copper(II) Bromide …
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level 4 q4 what is a substance made of two or more different atoms? a. …
C. Compound
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level 4 what part of the atom occupies the most volume? a. nucleus b. p…
D. Electron cloud
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what is a substance that is made of only one type of atom? a. element b…
A. Element
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level 3 what is a substance that is made of only one type of atom? a. e…
A. Element ### Q4
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what is this sodium atom known as? loses outer electron a. isomer b. is…
D. Ion
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level 3 what is the atom given below? a. lonner b. isotope c. alluri d.…
8 (assuming the option with 8 is correct, e.g., if options are A.6, B.8, C.7, D.14, then B. 8) ### Q4 Solution:
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9. chemical formula section ii: chemical formulas & ratio between ions …
10. Formula: $\text{CaCl}_2$; Ratio: $1:2$ 11. Formula: $\text{Na}_2\text{S}$; Ratio: $2:1$ 13. Formula: $\text{Cu(NO}_3\text{)}_2$; Ratio: $1:2$ 14. Formula: $\text{Al}_2(\text{C…
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using the information below, δh = enter answer for: 5c(s) + 6h₂(g) → c₅…
-173
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question 8 two aqueous solutions are mixed in a constant pressure calor…
63.3
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homework content page 6 of 10 question 6 h - o has a stronger bond than…
A. True
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question 5 calculate the energy (in kj) during the reaction involving 9…
\(-2.87\times10^{3}\) (or \(-2870\))
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k/u - true or false question 12 (1 point) according to the 2nd law of t…
True ### Question 13
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match the reactions shown with the process that they are depicting. pro…
1. $\ce{F_{2(g)} -> 2F_{(g)}}$ - Bond enthalpy 2. $\ce{Na_{(s)} + \frac{1}{2}F_{2(g)} -> NaF_{(s)}}$ - Standard enthalpy of formation 3. $\ce{Na_{(g)} -> Na^+_{(g)} + e^-}$ - Ioni…
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homework content page 3 of 10 question 3 shorter bonds are stronger bon…
A. True
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question 1 given a δh of -112 kj, which statement is correct? a the rea…
B. The reaction is exothermic. Heat is released by the system to the surroundings.
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# 3 - energy changes and rates of reactions (part 1) question 10 (1 poi…
B. Lower peak than uncatalyzed reaction (assuming the second option is labeled as B, if the original options had labels like A, B, C, D with the second option being B. If the labe…
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3 - energy changes and rates of reactions (part 1) question 9 (1 point)…
D. Catalysts provide an alternative pathway with lower activation energy
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which of the following describes the typical conditions of the soil whe…
A. Waterlogged, low in oxygen, and rich in organic matter ### Second Question (Largest mangrove area country):
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15. what material are asteroids made of? organic compounds ice and dust…
rocky materials and metals
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question 6 (1 point) in the chemical reaction below, the rate of consum…
4.0 mol/L·min (the option with this value, e.g., if the first option is 4.0 mol/L·min, then the answer is that option)
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document - ess august 2025 set 5 - how did earth get its water? scienti…
3. Many asteroids have water that is very close in D/H ratios to Earth's oceans, so asteroids could be a source of water on early Earth.
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early earth with uniform composition a chemically fractionated earth ch…
C. iron and nickel
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question 3 (1 point) the molar heat of vaporization of water is 42 kj/m…
7.0 kJ (corresponding to the option "7.0 kJ")
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# 3 - energy changes and rates of reactions (part 1) question 1 (1 poin…
$\boldsymbol{\Delta H = -890}$ kJ/mol (the option with $\Delta H = -890$ kJ/mol) ### Question 2
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unit 6: chemical reactions lab 3- chemical reactions - applying to the …
Digestion of sugars in the body is a chemical change. Evidence: New substances (metabolic products) are formed, and energy is released (a sign of a chemical reaction).
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look at the graph, how is the higher temperature line different than th…
B. The higher temperature line reaches the maximum amount of products first
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why does increasing the concentration of a reactant make the time of re…
Green. More reactants means more collisions and more reactions!
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if magnesium is cut up into smaller pieces, what happens to the time of…
A. Less time of reaction than using a bigger piece
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what is one of the conditions needed when reactants collide in order to…
C. Hit each other with enough energy (assuming the green option is labeled C; if the original labels were different, adjust the identifier, but based on content, the correct optio…
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why does increasing the temperature of a reactant make the time of reac…
Blue Option. Higher temperature means more collisions and more reactions!
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what is the molar mass for ag? 107.868 g/mol 112.411 g/mol 106.868 196.…
107.868 g/mol
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part 1 multiple choice: write the answer that best answers the question…
1. C. protons and neutrons 2. B. energy 3. D. isotopes 4. A. Protons only 5. B. 6 6. A. 5 7. D. mass number minus the atomic number 8. A. numbers of neutrons 9. B. Nickel 10. B. C…
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what is the molar mass for o2?
31.998 g/mol (the option with this value, e.g., if the green option is 31.998 g/mol, then the answer is the green - colored option with text "31.998 g/mol")
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what is the molar mass of potassium? 32.066 g/mol 30.974 g/mol 39.098 g…
39.098 g/mol (the option with 39.098 g/mol, likely the green - colored option in the given choices)
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what is the molar mass of mg? 25.305 g/mol 54.938 g/mol 58.61 g/mol 24.…
24.305 g/mol (the option with "24.305 g/mol")
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what is the molar mass of calcium? 40.078 g/mol 63.546 g/mol 24.022 g/m…
A. 40.078 g/mol
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what is the molar mass for mn?
54.938 g/mol (the option with this value, e.g., if the red box has 54.938 g/mol, then the answer is the option corresponding to 54.938 g/mol)
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what is the molar mass of cl2?
70.906 g/mol (corresponding to the option with 70.906 g/mol, e.g., if the red box option is D. 70.906 g/mol, then D. 70.906 g/mol)
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what is the molar mass of h2o? 1.008 g/mol 18.015 g/mol 15.9999 g/mol 1…
18.015 g/mol (corresponding to the blue option: 18.015 g/mol)
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what is the molar mass of naoh? 35.997 g/mol 38.989 g/mol 39.997 g/mol …
39.997 g/mol (corresponding to the green option: 39.997 g/mol)
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what is the molar mass for ca(oh)2? 72.092 g/mol 70.092 g/mol 79.092 g/…
74.092 g/mol (corresponding to the red option: 74.092 g/mol)
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what is the molar mass of mgo? 40.003 g/mol 48.610 g/mol 45.255 g/mol 4…
40.304 g/mol (corresponding to the red option: 40.304 g/mol)
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practice: atomic calculations part 1: atomic structure 1. drag 4 proton…
4. 0 5. Beryllium 6. The number of protons (atomic number) is 4, which matches Beryllium's atomic number. Part 2: Top label: Atomic Number (7); Middle left label: Chemical Symbol …
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unit 6: chemical reactions - part 4 calculations below you will find th…
\(1CuSO_4+2NaHCO_3 ightarrow1CuCO_3 + 1Na_2SO_4+1CO_2 + 1H_2O\)
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to support your answer. 8. predict the polarity of the following molecu…
1. bent 2. octahedral 3. tetrahedral 4. trigonal pyramidal 5. trigonal planar
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the rhyme pattern that occurs at the ends of lines in poetry is called …
a rhyme scheme.
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guiding questions question 2 of 7 the people of the wampanoag village o…
C. were killed by diseases brought over by European explorers.
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multiple - choice question how does sulfur trioxide react in the atmosp…
it reacts with water to form sulfuric acid
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multiple - choice question what is formed when dimethyl sulfide reacts …
sulfur dioxide
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1. complete the table below by providing a set of quantum numbers for t…
1. | e⁻ | Principle quantum number ($n$) | Orbital Shape quantum number ($l$) | Magnetic quantum number ($m_l$) | Spin quantum number ($m_s$) | |-----|----------------------------…
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question 22 (1 point) saved which of the following has the greatest num…
\(I_3^-\)
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page 5 of 5 you can use this periodic table during the quiz. however, a…
\(SF_6\)
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question 21 (1 point) which of the following compounds demonstrates an …
\(SF_6\) ### Question 22
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a water pipe bursting when it freezes is an example of waters ability t…
A. expand.
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question 20 (1 point) which of the following has the greatest number of…
C. \(ClF_{3}\)
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question 19 (1 point) which of the following is not a correct statement…
B. Electrons are most stable when they are unpaired.
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question 17 (1 point) the number of electron groups exists in the valen…
3 ### Question 18
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14. which of the following elements would be the best conductor of elec…
C. Nickel ### Question 15
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question 17 (1 point) the number of electron groups exists in the valen…
3 ### Question 18
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question 16 (1 point) saved water is considered the \universal solvent\…
True
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question 15 (1 point) ✓ saved why are the groups shown in the table bel…
They influence the physical and chemical properties of the molecule.
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question 14 (1 point) ✓ saved hydrophilic compounds are those that attr…
True
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page 4 of 5 you can use this periodic table during the quiz. however, a…
\(SF_6\)
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question 15 (1 point) which of the following molecules is non - polar? …
\(CO_2\)
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quiz #2:chapter 4 0:16:24 remaining question 13 (1 point) which of the …
- **Question 13**: the state of the substance - **Question 14**: dipole - dipole force
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unit 2 the atom test honors part i multiple choice: select the letter c…
B. 9 neutrons and 8 electrons. ### Question 2
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question 11 (1 point) the magnitude of london dispersion forces is prop…
molecular mass of participating molecules # Question 12
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question 10 (1 point) hydrogen bonds will form between a hydrogen atom …
nitrogen
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question 10 (1 point) ✓ saved according to the ph scale shown below, wh…
Gastric Juice
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which of the following is an example of an intermolecular force? pi bon…
dipole-dipole force
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question 9 (1 point) ✓ saved in the bond shown in the image below, the …
shared unequally between atoms
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question 8 (1 point) saved which arrow is pointing to a hydrogen bond i…
B. Option Text
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question 8 (1 point) using the vsepr theory, predict that the shape of …
linear # Question 9
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question 9 opioids are chemically similar to serotonin. true false ques…
False ### Question 10
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question 7 (1 point) which of the following molecules demonstrates a sq…
None of the given options (\(XeO_3\), \(XeF_4\), \(CCl_4\), \(CH_4\)) have a square - pyramidal molecular structure. If we assume there is a mistake in the options and consider \(…
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question 6 (1 point) the bond angle in co₃²⁻ is expected to be approxim…
C. 120 degrees # Question 7
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question 5 (1 point) saved what does the following formula represent? h…
The autoionization of water.
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question 3 (1 point) ✓ saved which of the following is an organic compo…
D. \(CH_4\)
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sbi4u1 quiz 1 question 1 (1 point) ✓ saved ms. hiba goes to the beach i…
B. water has a high specific heat capacity.
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the molecules in the following set do not include which of the followin…
trigonal pyramidal
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question 4 (1 point) carbon is able to form the backbone of large diver…
all of the above
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question 5 (1 point) which of the following molecules demonstrates a tr…
\(BF_3\) and \(NO_3^-\) (assuming the question had a typo for \(NO_3\) as \(NO_3^-\)). If we consider the options as given (assuming \(NO_3\) is a typo and we go with the availabl…
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question 4 (1 point) a molecule exhibits the trigonal planar shape. how…
- **Question 4**: Three - **Question 5**: \(NO_3\) (assuming it is \(NO_3^-\)) and \(BF_3\)
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question 3 (1 point) based on the vsepr theory, which one of the follow…
HCN
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question 2 (1 point) using the vsepr theory, predict that the shape of …
trigonal planar
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which of the following does not affect the polarity of a molecule? the …
the state of the substance
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question 21 (1 point) hydrogen bonding is a particularly strong example…
dipole-dipole forces
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quiz #2:chapter 4 0:29:50 remaining page 1 of 5 you can use this period…
trigonal bipyramidal
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a kerosene. b benzene. c crude oil. d gasoline.
C. crude oil.
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which of the following factors explains why h₂o is a polar molecule? th…
an asymmetrical distribution of charge
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hydrogen bonds will form between a hydrogen atom in one molecule and wh…
nitrogen
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the magnitude of london dispersion forces is proportional to which of t…
molecular mass of participating molecules
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unit 6: chemical reactions - part 3 calculations below you will find th…
\(1\) \(NH_{3}+1\) \(CH_{3}COOH ightarrow1\) \(CH_{3}COO^{-}+1\) \(NH_{4}^{+}\)
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predict which of the following molecules will demonstrate the least pol…
O₂
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28. the factory was fined for allowing chemicals to _ the local river. …
A. pollute ### Question 29