化學
化學反應、化學計量、分子結構與元素性質。
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12 what are the products of this reaction? * (0.5 points) cao -> ca₂ + …
B. \(Ca + O_2\)
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11 identify the reaction type: * (0.5 points) ____agc₂h₃o₂(aq) + ____mg…
Double replacement
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10 what are the products of this reaction? * (0.5 points) mg + i₂ -> ○ …
\(MgI_2\) (corresponding to the option \(MgI_2\))
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9 identify the reaction type: * (0.5 points) ______c₅h₁₂(l) + ______o₂(…
Combustion
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8 identify the reaction type: * (0.5 points) what type of chemical reac…
C. Combustion
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what are the products of this reaction? * (0.5 points) \\underline{\\hs…
$\boldsymbol{CO_2 + H_2O}$ (the option with "CO₂ + H₂O")
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6 identify the reaction type: * (0.5 points) al + o₂ -> singlereplaceme…
Synthesis (the option labeled "Synthesis")
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5 identify the reaction type: * (0.5 points) what type of chemical reac…
C. Decomposition
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4 what are the products of this reaction? * (0.5 points) ____agno₃(aq) …
A. $Al(NO_3)_3 + Ag$
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3 identify the reaction type: * (0.5 points) what type of chemical reac…
A. Single replacement
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2 identify the reaction type: * (0.5 points) cao -> singlereplacement c…
C. Synthesis (assuming the reaction is a synthesis reaction forming CaO, e.g., \( 2Ca + O_2 ightarrow 2CaO \); if the reaction was decomposition, it would be breaking down, but th…
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1 what are the products of this reaction? * (0.5 points) ____na₃po₄(aq)…
\(NaNO3 + Ag_{3}PO_{4}\) (the second option: \(NaNO3 + Ag_{3}PO_{4}\))
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1. what process produces the light and energy from stars? a) chemical r…
b) Nuclear fusion ### Question 2
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in school, jarrett learned that salt lowers the freezing point of water…
A. Place both containers in a freezer, and record the temperatures at which they begin to freeze.
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part 3: match each diagram with its correct description. diagrams will …
1. C 2. E 3. B 4. A 5. D
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rocket engines can be fueled by liquid hydrogen. the liquid hydrogen re…
s: - Number of H atoms: 8 - Number of O atoms: 4 - Number of \( H_2O \) molecules: 4 (For the table: H: 8, O: 4; for the molecule count: 4)
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wk. #2 directions - use your periodic table and the chart above. if giv…
### Part 1 (Covalent Compounds): a. $P_2O_5$ b. $BCl_3$ c. $N_2O_4$ d. Dinitrogen monoxide (nitrous oxide) e. Phosphorus pentafluoride f. Carbon tetrabromide ### Part 2 (Ionic Com…
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5. determine the products and write a balanced chemical equation to sho…
(for part b as an example, since it has a clear precipitate): The balanced chemical equation for the reaction between sodium sulphate ($\ce{Na2SO4}$) and barium chloride ($\ce{BaC…
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gow questions (kool - aid version!) according to the graph, what is the…
0.067M
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gow questions (kool-aid version!!) moles of kool-aid powder | molarity …
0.0123M (Assuming the correct formula is \( \text{Molarity}=4\times(\text{moles of Kool - Aid})- 0.0005 \))
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gow questions (kool-aid version!!) moles of kool - aid powder | molarit…
Linear positive slope
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a teacher asks students to prepare a kool - aid solution with a molarit…
0.0017 moles (assuming the first option is "0.0017 moles" as per the partial text, if the options are: A. 0.0017 moles, B. 0.0025 moles, C. 0.003 moles, D. 0.001 moles, then the a…
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gow questions (kool-aid version!!) moles of kool-aid powder | molarity …
Molarity increases as moles of Kool - Aid powder increase (the corresponding option among the given choices, e.g., if the option was labeled as C: Molarity increases as moles of K…
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moles of kool - aid powder molarity of kool - aid 0.0012 0.006 0.0015 0…
0.007M
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ipc final exam review a cup of soil is tested for acidity and shows a p…
A. too acidic and may hurt plant growth
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ipc final exam review what are elements that are gases, or brittle soli…
A. nonmetals
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ipc final exam review what are elements in group 3 to 12 called? isotop…
C. Transition Metals
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what lane is making kool - aid? is the solute and the is the solvent? w…
- For "We are making Kool - Aid": - Solute: Kool - Aid powder - Solvent: water - For "We are making Hot Chocolate": - Solute: hot chocolate powder - Solvent: milk
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ipc final exam review which of the following is a chemical property? ○ …
D. ability to react with oxygen
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ipc final exam review what is the mass number of an atom with 26 proton…
D. 56 (suponiendo que la última opción es 56, ya que las opciones son 52, 26, 30, 56. Entonces la opción correcta es la que tiene 56, por ejemplo, si la última opción es D. 56, en…
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match the definition to the term. - the substance that gets dissolved -…
- solute → the substance that gets dissolved - solvent → what the solute gets dissolved into - solution → a homogeneous mixture of 2 or more substances
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ipc final exam review one of the physical properties of bases is that t…
B. feel slippery
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ipc final exam review what are the coefficients should be added to the …
Los coeficientes son: 2 (para $\text{Na}$), 1 (para $\text{Cl}_2$) y 2 (para $\text{NaCl}$).
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read the passage to help you answer the questions!! in this graph, the …
- Initial state: solid (correct) - Point A: increasing (correction from "staying the same") - Point B: staying the same (correct), phase change: solid → liquid (correct) - Point C…
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multiple choice which nation was the most advantaged by its development…
C. Germany
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multiple choice which factor contributed to turning the early part of t…
C. the use of trench warfare
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24. why do noble gases tend to be unreactive? it will have a stable con…
Noble gases are unreactive because they have a full valence electron shell (stable electron configuration). When an atom forms an ion, it will have a stable configuration like a n…
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read the passage to help you answer the questions!! in this graph, the …
- At point B: temperature is constant; substance changes from solid to liquid. - At point C: temperature is increasing. - At point D: temperature is constant; substance changes fr…
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explain your answer. 21. why do atoms get smaller going left to right a…
As we move left to right across a period, the number of protons in the nucleus increases (increasing nuclear charge), while electrons are added to the same energy level. The stron…
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suppose that figure 1 represents the so - called heating curve for subs…
Substance B has the higher melting point but Substance A has the higher boiling point.
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heated to its boiling point temperature. at its boiling point temperatu…
First the sample increases its temperature; then it melts; then its temperature increases.
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list 2 intensive physical properties and 2 chemical properties the meta…
# Brief Explanations: - Intensive physical properties (IPP) don't depend on amount. For a metal scoopula (usually metal like stainless steel, often Fe/Cr/Ni or aluminum, etc.): - …
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figure 1 which one of the following statements are true of the sample o…
The sample is melting between a temperature of about - 100°C and - 10°C. (Wait, no, earlier analysis was wrong. Wait, maybe I misread the graph. Wait, the first point A is at (50,…
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engage with science the future of the sun a listen to the science artic…
c. supernova 2. # Brief Explanations: Only massive stars (with sufficient mass) can collapse to form black holes. The Sun is not massive enough, and fusion is a process in stars, …
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25. to balance a chemical equation, it may be necessary to adjust the _…
A. coefficients ### Question 26
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question 1-49 what happens to energy during the melting of ice? ○ energ…
Energy is absorbed
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question 1-48 please use the provided copy of the periodic table for th…
Noble gases
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25. to balance a chemical equation, it may be necessary to adjust the a…
A. coefficients ### Question 26
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question 1-47 which equation properly shows that one molecule of methan…
CH₄+2O₂→CO₂+2H₂O
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which of the following is the correct lewis structure for n₂? n - n wit…
\( \text{N} \equiv \text{N} \) with one lone pair on each nitrogen (the second option in the list, assuming the options are ordered as: 1. N - N no lone pairs, 2. N = N two lone p…
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metals and nonmetals form which kind of bond? olar covalent ionic non -…
Ionic (the option with the text "Ionic")
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how do the following two elements bond together? al³⁺ o²⁻
$Al_2O_3$ (the option with $Al_2O_3$ text, likely the last option shown with the snowflake icon)
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question 1-44 please use the provided copy of the periodic table for th…
They have the same number of electrons in their outermost energy level (valence electrons).
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4. element x has two naturally occurring isotopes of masses 106.905 amu…
B. 107.9 amu
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12. a teacher wants to demonstrate a chemical reaction for her students…
A. Placing metal in an acid to create gas ### Question 13
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8. ____ c + ____ h₂ → ____ ch₄ elements | reactants | products c | | h …
(for each equation, balanced coefficients and table filled): ## Equation 8: - Coefficients: \( \boldsymbol{1}\text{C} + \boldsymbol{2}\text{H}_2 ightarrow \boldsymbol{1}\text{CH}_…
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18. what type of bond forms between two nonmetals? a. ionic b. metallic…
C. Covalent ### Question 19
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match the mineral categories to their best descriptions. sulfate minera…
Sulfate minerals - Contains the elements sulfur and oxygen Native element minerals - Contains atoms of a single element Halide minerals - Minerals that contain elements that combi…
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10. a cation is formed when an atom: a. gains electrons b. loses electr…
B. Loses electrons ### Question 11
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what is the correct formula for the compound tin (iv) nitrate? ○ sn(no₂…
The correct option is \( \text{Sn(NO}_3\text{)}_4 \) (the last option, assuming the first "8n" is a typo for "Sn"). So the answer is the option with formula \( \text{Sn(NO}_3\text…
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what would be the correct name of s₅f₄ ○ 5sulfflouride ○ pentasulfur te…
B. Pentasulfur Tetrafluoride (assuming the second option is labeled B; if the original options had labels like A, B, C, D, adjust the label accordingly based on the position, but …
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what is the formula for nitric acid? ○ h(no₂) ○ h₃n ○ h(no₃) ○ h₂(no₃)
C. $\ce{H(NO_3)}$ (assuming the options are labeled A: $\ce{H(NO_2)}$, B: $\ce{H_3N}$, C: $\ce{H(NO_3)}$, D: $\ce{H_2(NO_3)}$)
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cu₂(co₃) ○ copper (ii) carbonate ○ copper carbonate ○ copper (i) carbon…
copper (I) carbonate
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what is the formula when silver (i) bonds with chlorate? ○ ag₂(clo₃) ○ …
D. \( \text{Ag(ClO}_3\text{)} \) (assuming the last option is D, as per the order: 1. \( \text{Ag}_2(\text{ClO}_3) \), 2. \( \text{AgCl} \), 3. \( \text{Ag(ClO}_3\text{)}_2 \), 4.…
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matching: elements in the earths crust directions: fill in the blank wi…
Oxygen: C Iron: G Mineral: I Sodium: L Aluminum: J Silicates: E Silicon: K Potassium: B Magnesium: F Non - silicates: H Calcium: A Crust: D
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hydrogen peroxide can be used to disinfect and clean surfaces around th…
s: - H atoms: 40 - O atoms: 40 - $H_2O_2$ molecules: 20 (For the table: H: 40, O: 40; and $H_2O_2$: 20)
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ethanol is a chemical that is used in many hand sanitizers. it is produ…
s for the table: - H: \( \boldsymbol{30} \) - C: \( \boldsymbol{10} \) - O: \( \boldsymbol{5} \)
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nitrogen dioxide is a gas commonly found in polluted air. it is produce…
s: - N atoms: \( \boldsymbol{6} \) - O atoms: \( \boldsymbol{12} \) - \( NO_2 \) molecules: \( \boldsymbol{6} \)
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sulfuryl chloride is a substance used to make chemicals for killing ins…
(Table): - O: \( 12 \) - S: \( 6 \) - Cl: \( 12 \)
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ammonia is commonly used as a fertilizer for plants. it is made when ni…
s: - Number of H atoms: \(\boldsymbol{24}\) - Number of N atoms: \(\boldsymbol{8}\) - Number of \( NH_3 \) molecules: \(\boldsymbol{8}\)
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phosgene is a substance that is often used to make the padding found in…
### For the table (counting atoms): #### Step 1: Count Carbon (C) atoms Each CO molecule has 1 C atom. There are 3 CO molecules. So number of C atoms = \( 3 \times 1 = 3 \) #### S…
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practice questions: 4. how many moles are present in a sample of co₂, m…
The number of moles is approximately \(9.68\) mol. ### Question 5:
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what have the scientific studies identified as the major cause of acid …
A. burning of fossil fuels that release sulfur and nitrogen compounds into the air
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3. a sample contains 1.25mol of nitrogen dioxide, co₂ a) how many molec…
a) The number of \( \text{CO}_2 \) molecules is \( \boldsymbol{7.52\times 10^{23}} \). b) The number of atoms in the sample is \( \boldsymbol{2.26\times 10^{24}} \).
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3/25 what charge will bromine form when becoming an ion? 7+ 7- 1- 0 1+
1- (the option with "1-")
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to designate an anion formed when an atom gains one or more electrons, …
ide
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nₐ-avogadro constant practice questions: 1. a sample contains 4.70×10⁻⁴…
1. The number of copper atoms is \(\boldsymbol{2.83 \times 10^{20}}\). 2. The number of ammonia molecules is \(\boldsymbol{1.66 \times 10^{23}}\).
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9. noble gases have how many valence electrons (usually)? a. 1 b. 2 c. …
D. 8
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1. a vertical column on the periodic table is called a: a. period b. ro…
D. Family/Group ### Question 2
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6. a vertical column on the periodic table is called a a. period b. row…
A. Group 1 Now question 8 (Halogens are in:).
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lewis dot structure worksheet draw the lewis dot structure of the given…
### For \( \boldsymbol{NI_3} \) # Explanation: ## Step1: Calculate valence electrons Nitrogen (N) has 5 valence electrons, each Iodine (I) has 7, and there are 3 I atoms. So total…
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let me not to the marriage of true minds admit impediments. love is not…
abab
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matching list listen match each word to its definition. energy stored i…
- energy stored in a molecule: b. chemical energy - energy of motion: a. kinetic energy
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1. differentiate electrolytes and non - electrolytes 2. give an example…
Electrolytes: Substances that dissociate into ions in solution (or molten state) and can conduct electricity (e.g., sodium chloride, potassium chloride). Non - electrolytes: Subst…
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from nature addresses, and lectures 1. the first in time and the first …
2. Man possesses an admiration for nature’s beauty.
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le chateliers principle is a ______ that describes how a change in the …
B. qualitative term
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how many moles of hydrochloric acid (in mol) are needed to produce 0.83…
$1.66$
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which is evidence that a chemical reaction has occurred? a a phase chan…
B. a new gas is observed in the form of bubbles
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8. which element does not form a diatomic molecule in its elemental for…
B. boron
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(in hindi ti) (subtitle b answers 3) question 3 what is the electron co…
The correct electron configuration for \(S^{2-}\) is \(1s^2 2s^2 2p^6 3s^2 3p^6\) (the option corresponding to this configuration, likely the one labeled with the correct configur…
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calculate the poh and ph of a 0.002 m solution of potassium hydroxide (…
For KOH solution: \(pOH = -\log[0.002] \approx 2.70\), \(pH = 14.00 - 2.70 = 11.30\) For HF solution: \(pOH = 14.00 - 5.3 = 8.7\), \([OH^-] = 10^{-8.7} \approx 2\times10^{-9}\ M\)…
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4. an atom with the electron configuration, $1s^2 2s^2 2p^4$, forms che…
The number of lone pairs on the central (oxygen) atom is 2. The shape of the \(H_2O\) molecule (as per VSEPR theory) is bent (angular).
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14 explain why you should not tear down asbestos and simply throw it aw…
Question 14: Asbestos fibers are toxic when inhaled; tearing it down releases fibers, causing health issues (e.g., cancer). Professional handling is required. Question 15: Lead pa…
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77. what important gas is released when water is split? type a response
Oxygen (and Hydrogen; but Oxygen is a key important gas released, along with Hydrogen. Primarily, Oxygen (or $O_2$) is a vital gas released when water is split, along with Hydroge…
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question 7 (5 points) listen this classification of drug typically chan…
B. Narcotics ### Question 8
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in the following reaction, how many electrons are exchanged between the…
2 ### Second Sub - Question (True Statement about Redox)
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using the activity series, predict if the following reaction will occur…
Spontaneous, \( \text{LiBr} \) and \( \text{Zn} \) (the third option) ### Second Question (Electron Exchange)
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using the activity series, predict if the following reaction will occur…
For \(Ni(s)+Sn(ClO_4)_2(aq) ightarrow\): A. Spontaneous, \(Ni(ClO_4)_2\) and \(Sn\) For \(Ca(s)+LiC_2H_3O_2(aq) ightarrow\): E. Not Spontaneous (No reaction)
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question 11 in the reaction below, which element is oxidized? mn(s) + c…
B. Mn ### Question 12
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question 9 in the reaction below, which element is oxidized? 3k(s) + cr…
A. K ### Question 10