Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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org/resource/1b944d4a-6408-41e3-bb01-39845bd63cff/chemistry-203-separat…
## 4-5 Different Ways to Separate Mixtures: 1. **Magnetic Separation**: Use a magnet to pull out magnetic components from non-magnetic ones in a mixture. 2. **Filtration**: Pass a…
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1. draw the structure of the alcohol, carboxylic acid and ester needed …
### Structure of alcohol (Ethanol): ``` H H | | H — C — C — O — H | | H H ``` ### Structure of carboxylic acid (Benzoic acid): ``` O || H — O — C — C₆H₅ (where C₆H₅ is the benzene…
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determine the volume in ml of a 0.250 m solution of hydrochloric acid n…
20.0
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to calculate the percent error (% error) we use: |experimental value - …
6.7%
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to calculate the concentration of a dilution we use: $c_{stock} \\times…
330 mL (the option with "330 mL")
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part: 1 / 2 part 2 of 2 write the net ionic equation for the precipitat…
To solve this, we need the precipitation reaction from Part 1 (which isn't provided here). However, a general example of writing a net ionic equation for a precipitation reaction …
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note: reference the solubility of ionic compounds in water table for ad…
\( \ce{CuCl(aq) + NaI(aq)} \) (the option with \( \ce{CuCl(aq) + NaI(aq)} \))
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part 2 of 2 zni₂(aq) + h₃po₄(aq) →
The balanced equation is \(3ZnI_2(aq)+2H_3PO_4(aq) ightarrow Zn_3(PO_4)_2(s)+6HI(aq)\) (If the question was to balance the equation. Since the original problem was a bit unclear b…
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what is the net ionic equation for each of the following reactions? not…
\( 2\text{Li}(s) + 2\text{H}^+(aq) ightarrow 2\text{Li}^+(aq) + \text{H}_2(g) \)
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select all of the following reactions that produce a precipitate. check…
- $\ce{NaOH(aq) + FeCl_{3}(aq) ->}$ (produces $\ce{Fe(OH)_{3}}$ precipitate) - $\ce{Zn(s) + FeBr_{3}(aq) ->}$ (produces $\ce{Fe}$ precipitate) - $\ce{BaCl_{2}(aq) + H_{2}SO_{4}(aq…
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part 4 of 4 ba(no₃)₂ ○ soluble ○ insoluble cu(oh)₂ ○ soluble ○ insoluble
insoluble ### For $\boldsymbol{Ba(NO_3)_2}$:
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classify each ionic compound as insoluble or soluble in water. select t…
soluble ### Part 2: $\boldsymbol{\ce{AgBr}}$
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select the correct statements below. note: more than one statement may …
B. A precipitate can collect at the bottom of a vessel or be suspended within a solution, making the mixture appear cloudy D. A gas evolution reaction occurs when two aqueous subs…
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8. what is the atomic number of an element? 9. what charge does a neutr…
b. neutral
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7. who developed the periodic table? a. niels bohr b. anton van leuenho…
c. Dmitri Mendeleev
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6. what family of elements am i in? a. co b. cl c. ba d. as e. pm f. fr…
Transition Metals ### Part b: Cl (Chlorine)
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6. a chemical reaction produces 0.0125 mol of oxygen gas in 3 minutes a…
a) $12.5\ \text{millimoles}$ b) $210\ \text{seconds}$ c) $\frac{12.5}{210} \approx 0.0595\ \text{millimoles per second}$
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this energy diagram shows the allowed energy levels of an electron in a…
D ### 2. How many excited states are there?
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Question was provided via image upload.
c) This image is a compound because different elements have combined with each other ### Question 2 (Explanation)
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date: teamwork makes the dream work: read the question and then answer …
d. \(NO_2\) ### Question 2
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2. which element below belongs to the noble gas family? a) group 1 peri…
d) Group 18 period 3 ### Question 3
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name: date: teamwork makes the dream work: read the question and then a…
- More reactive pair: Sr and Ba (they are alkaline earth metals in Group 2, have 2 valence electrons, and readily react by losing electrons). - Less reactive pair: Ne and Ar (they…
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name: _______________ date: _______________ teamwork makes the dream wo…
d. Li and Cs ### Question 3 (Least Similar Properties)
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date: the periodic table daily question: how does the periodic table he…
The Periodic Table helps us better understand each element by: - Organizing elements by atomic number (proton count) to show atomic structure. - Classifying elements as metals (le…
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independent work 1. which of these determines the identity of an elemen…
b. Number of protons ### Question 2 To fill the table, we use: - Electrons in neutral atom = Protons. - Atomic Mass = Protons + Neutrons. #### Titanium: Neutrons = Atomic Mass - P…
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name: date: atomic number = # of protons = # of electrons example: brom…
Atomic mass: 7 amu, Atomic number: 3. Explanation: Atomic mass is protons + neutrons (3 + 4 = 7), atomic number is number of protons (3). ### Question 2:
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22. an apothecary is a person who prepares and sells drugs or compounds…
22. Poison. 23. The conclusion occurs rapidly: the two rioters kill the third, and then immediately die from drinking the poisoned wine he brought. 24. Their greed for the gold co…
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for the next four reactions you will need to determine what the product…
### Part g: | Reactants | Before Balancing | After Balancing | Products | Before Balancing | After Balancing | |-----------|------------------|-----------------|----------|-------…
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1. $c_3h_8 + 5o_2 \ ightarrow 3co_2 + 4h_2o$ a. if i start with 5 moles…
a. $20$ moles b. $4$ moles c. $\text{O}_2$ (oxygen) d. $4$ moles of $\text{H}_2\text{O}$
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select all the statements that are true of the physical aspects of soun…
- Air molecules move in regular, wavelike patterns. - A medium such as air or water is necessary to conduct sound to our ears. - It is created by a vibrating source.
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2. what three deductions are taken from everyones pay? a. b. c.
a. Income Tax b. Social Security (or national pension scheme contributions) c. Medicare (or public health insurance contributions)
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given the (unbalanced) reaction equation: nh₃(g) + o₂(g) → no(g) + h₂o(…
- First reaction: $-902$ kJ - Second reaction: $-1266$ kJ
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select all the statements that are true of the physical aspects of soun…
- Air molecules move in regular, wavelike patterns. - A medium such as air or water is necessary to conduct sound to our ears. - It is created by a vibrating source.
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which of the following be the correct lewis structure for cacl₂? a. :cl…
C. $[:\ddot{\text{Cl}}:]^- \text{Ca}^{2+} [: \ddot{\text{Cl}}:]^-$
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indicate whether each electron configuration below is correct or incorr…
1. $\text{S}^{2-}$: Incorrect 2. $\text{Rb}^{2+}$: Incorrect 3. $\text{Ga}^{3+}$: Incorrect
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8. read the passage below. which of the following best describes the au…
8. A. to persuade and to inform 9. C. to inform and to entertain
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indicate whether each electron configuration below is correct or incorr…
1. $\text{K}^+$: Incorrect 2. $\text{Ni}^{2+}$: Incorrect 3. $\text{As}^{3-}$: Correct 4. $\text{Cu}^{2+}$: Incorrect 5. $\text{Br}^{2-}$: Incorrect 6. $\text{Fe}^{3+}$: Correct
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advanced practice - homework which of these atoms has the smallest numb…
A. \(^1\text{H}\) ### Q4 (Which one of the following is a correct electron arrangement?)
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multiple choice question if your specific purpose is \to persuade my au…
a reason why listeners should only eat organic produce
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q8.an atom in which the number of protons is greater than the number of…
C. \(^3\text{He}\) ### Q10
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directions: answer each question completely. indicate how you determine…
$KClO_3 ightarrow KCl + O_2$ ### Part b
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reduction is the gain of electrons. true false
A. True
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1. define polar covalent bond. 2. define non - polar covalent bond. 3. …
A covalent bond where electrons are shared unequally between atoms (due to different electronegativities), creating partial charges (δ⁺ and δ⁻) on the atoms. ### Question 2: Defin…
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when nacl (table salt) forms, sodium (na) loses energy by ______ and ch…
A. giving up an electron in oxidation; gaining an electron in reduction
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oxidation-reduction reactions never occur at the same time. remove elec…
occur simultaneously.
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sea caves in cape greco national forest park, cyprus which type of weat…
A. mechanical weathering
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the chemical formula for glucose is ______. \\(\\boldsymbol{\\mathrm{c_…
The fifth option (the one with \( C_6H_{12}O_6 \))
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which of the following is not an example of kinetic energy? heat light …
the energy in chemical bonds
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the amount of energy required to raise the temperature of one gram of w…
A. calorie.
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a ______ is the amount of energy required to raise 1 gram of water 1 de…
calorie
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a measure of the degree of disorder in a system is called _______. ente…
entropy
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what are the building principles of an organic management system? - int…
A. Interdependency and cooperative effort ### Question 20 (False Statement about Larger Organizations)
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elements of the periodic table 13. which element is number 16 on the pe…
s: 13. Sulfur 14. Na 15. 30 16. ~12.01 (or 12) 17. Tungsten 18. 37 19. 15 20. Xenon 21. Neptunium 22. 83
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elements of the periodic table 1. what is an element? a basic part of a…
To answer the blanks in the "Elements of the Periodic Table" web quest: ### Question 2: Currently, **94** different elements are known to exist in nature, although additional elem…
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9. how do you determine the number of valence electrons that an element…
s (summarized): 9. Use the element’s group number (main - group: group # = valence e⁻; transition metals: variable). 10. At the top of each vertical column (group). 11. Organized …
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6 infer the atomic number of barium is 56. what do you know about the s…
- A neutral barium atom has 56 protons in its nucleus. - A neutral barium atom has 56 electrons orbiting the nucleus. - For the most abundant isotope (barium-138), the number of n…
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5 summarize what are the three main classes of elements? provide two ph…
The three main classes of elements, with two physical properties each, are: 1. Metals: High electrical conductivity; malleable (can be shaped without breaking) 2. Nonmetals: Poor …
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directions: read periodic table trends: what are groups and periods? th…
To answer these periodic table trend questions, we analyze each one based on chemistry concepts: ### 1. Properties of elements in a pattern Elements show patterns in **atomic radi…
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4 relate explain how the terms atom and element are related.
An element is a pure substance composed entirely of identical atoms, where each atom of the element has the same number of protons in its nucleus. Atoms are the basic building blo…
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vocabulary draw a line to connect the following terms to their definiti…
1. nucleus - C. the central region of an atom 2. element - A. a pure substance made up of one type of atom 3. chemical symbol - B. letters that represent an element
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lewis structure worksheet #1 summarize the instructions for drawing lew…
To solve Lewis structures, we follow these steps for a molecule (e.g., \( \text{CH}_4 \)): ### Step 1: Count Valence Electrons Carbon (C) has 4 valence electrons, and each Hydroge…
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concept: calculating density what is the density of a plastic ball that…
The density of the plastic ball is \(2\,\text{g/cm}^3\). ### Part 2: Density as a Physical or Chemical Property
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a solution has certain characteristics: - it is ______ or homogeneous, …
### Characteristics of a Solution: - It is $\boldsymbol{\text{uniform}}$, or homogeneous, throughout the mixture - It is $\boldsymbol{\text{does not separate}}$ over time or settl…
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part 4: suspensions and colloids use this website to answer these quest…
To answer these questions, we can refer to the provided website (http://www.ducksters.com/science/chemistry/chemical_mixtures.php) and recall basic concepts about suspensions and …
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instructions: for each chemical equation, write the correct reaction ty…
Synthesis (Combination) Reaction ### 2.
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examples given below underline each of these equations: a. synthesis (c…
To solve this, we need to underline each chemical equation as per the instructions. Let's go through each section: ### A. Synthesis (Combination) Reactions 1. $\underline{\ce{Na +…
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key vocabulary reactants, products, coefficients, subscripts, balanced …
\( 2 \) \( \text{Na} + 1 \) \( \text{Cl}_2 ightarrow 2 \) \( \text{NaCl} \) (Coefficients: 2, 1, 2) ### Problem 21:
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1. identify reactants and products: a) na + cl₂ → nacl 2. what does the…
Reactants: Sodium (\( \text{Na} \)), Chlorine (\( \text{Cl}_2 \)); Products: Sodium Chloride (\( \text{NaCl} \)) ### 2.
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d. if 30.6 g of methanol (ch₃oh) is used to start a fire, how many mole…
Approximately $5.75\times10^{23}$ molecules
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d. if 30.6 g of methanol (ch₃oh) is used to start a fire, how many mole…
Approximately $5.75\times10^{23}$ molecules of methanol were used.
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0.200 grams of di water is added to 4.93 grams of tert - butyl alcohol.…
\(8.45\ ^{\circ}\text{C}/m\) (or a value close to it depending on more precise calculations)
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0.500 grams of an unknown alcohol is added to 4.71 grams of tert - buty…
$\approx 46.8 \text{ g mol}^{-1}$ (or more precise value depending on calculation steps, e.g., if we use more precise values during calculation: $m=\frac{18.98}{8.37}\approx2.2676…
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short question why standard state is used for enthalpy changes?
Standard state is used for enthalpy changes to provide a consistent, universal reference point. Since absolute enthalpy cannot be measured, this defined set of conditions (1 atm, …
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identify whether each pair of reactants will react or not react. react …
## React: $\text{Al}(s) + \text{CuSO}_4(aq)$ $\text{Ca}(s) + \text{Pb(NO}_3\text{)}_2(aq)$ $\text{Ag}(s) + \text{HNO}_3(aq)$ ## Do not react: $\text{Zn}^{2+}(aq) + \text{SnCl}_2(a…
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which is a concept that helps increase short - term memory? ○ repetitio…
repetition
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question 28 (1 point) listen which of the following binary ionic compou…
d) potassium cyanide, KCN
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question 27 (1 point) listen which of the following binary ionic compou…
c) iron (III) bromide, $\text{FeBr}_3$ e) magnesium chloride, $\text{MgCl}_2$
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question 26 (0.5 points) listen which of the following compounds are na…
a) $\text{I}_2\text{O}_7$ - diiodine heptoxide c) $\text{CO}_2$ - carbon dioxide e) $\text{Br}_2\text{O}_3$ - dibromine trioxide
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practice unit 3 - spring 2026 question 25 (0.25 points) listen what is …
e) $S_2F_{10}$
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question 24 (0.25 points) listen what is the correct formula for the co…
c) $\text{CBr}_4$
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question 23 (0.25 points) listen what is the correct formula for the co…
b) $\text{Si}_3\text{N}_4$
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question 22 (0.25 points) listen what is the correct iupac name for p₃n…
d) triphosphorus pentanitride
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question 21 (0.25 points) listen what is the correct iupac name for \\(…
d) tetraphosphorus decoxide
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label the following compounds as molecular or ionic from their chemical…
- $\text{GaCl}_3$: 2. Ionic - $\text{ScN}$: 2. Ionic - $\text{P}_4\text{O}_{10}$: 1. Molecular - $\text{Na}_2\text{O}$: 2. Ionic - $\text{Bi}_2\text{S}_3$: 2. Ionic - $\text{CdSe}…
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question 19 (1 point) listen match the following elements to their grou…
- Iodine (I): 3. $\text{[Kr]} 5s^2 4d^{10} 5p^5$ - Zirconium (Zr): 6. $\text{[Kr]} 5s^2 4d^2$ - Arsenic (As): 1. $\text{[Ar]} 4s^2 3d^{10} 4p^3$ - Cadmium (Cd): 5. $\text{[Kr]} 5s…
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match the following elements to their ground - state electron configura…
- Beryllium (Be): 2. $1s^22s^2$ - Boron (B): 6. $1s^22s^22p^1$ - Fluorine (F): 4. $1s^22s^22p^5$ - Neon (Ne): 5. $1s^22s^22p^6$ - Sodium (Na): 7. $1s^22s^22p^63s^1$ - Nitrogen (N)…
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question 9 (0.25 points) listen what is the ground - state electron con…
$1s^22s^22p^63s^2$ --- ### Question 10
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question 5 (0.5 points) listen which of the following statements are tr…
- The only allowed values for $m_s$ are +1/2 and -1/2 - If $l = 0$, the electron must be in an s-orbital. - If $m_l = 2$, the electron must be in a d-orbital. --- ### Question 6
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match the element name with its correct symbol. barium bismuth 1. b bor…
- barium: 3. Ba - bismuth: 4. Bi - boron: 1. B - berkelium: 7. Bk - beryllium: 2. Be - bromine: 6. Br - bohrium: 5. Bh --- ### Second Multiple-Choice Problem
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match the element name with its correct symbol. sulfur silver 1. ag tin…
- sulfur: 3. S - silver: 1. Ag - tin: 9. Sn - scandium: 5. Sc - strontium: 6. Sr - selenium: 4. Se - antimony: 10. Sb - silicon: 8. Si - seaborgium: 7. Sg - sodium: 2. Na
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Question was provided via image upload.
## Completed Table: | Element | Quantum Numbers (for one valence e⁻) | Orbital diagram of valence electrons | Electron configuration | |-----------|-------------------------------…
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table 1. complete the following table: | element | quantum numbers | or…
| Element | Quantum Numbers | Orbital diagram of valence electrons | Electron configuration | |-----------|------------------------------------------------------------------------…
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low energy to high energy-order of filling 1s 2s 2p 3s 3p 4s 3d 4p 5s 4…
Scandium: $\boldsymbol{[Ar]4s^23d^1}$ Iron: $\boldsymbol{[Ar]4s^23d^6}$ Gallium: $\boldsymbol{[Ar]4s^23d^{10}4p^1}$ Cadmium: $\boldsymbol{[Kr]5s^24d^{10}}$ Lead: $\boldsymbol{[Xe]…
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- magnetic quantum number (m) - magnetic spin number (mₛ) atomic orbita…
- **s-orbital**: A single, hollow sphere centered on the atomic nucleus. - **p-orbitals**: Three separate dumbbell shapes, each aligned along one of the three Cartesian axes (x, y…
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a compressed spring has; chemical energy gravitational potential energy…
C. Elastic potential energy
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which type of energy transformation occurs when a stretched rubber band…
A. Potential to kinetic
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question 5 (2 points) what is the theoretical yield in grams of hydroge…
0.227
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how many atoms of hydrogen are in 1.255 grams of aluminum hydroxide? 0.…
2.906 × 10²² H atoms (the last option) ### Second Question (Balanced Reaction)
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when balanced, what is the stoichiometric coefficient on lioh?\ $\\ce{h…
two ### Question 2:
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this question has multiple parts. work all the parts to get the most po…
s: a. \( \boldsymbol{\ce{_{19}^{39}K}} \) b. \( \boldsymbol{\ce{_{36}^{84}Kr}} \) c. \( \boldsymbol{\ce{_{13}^{27}Al}} \)