化学
化学反応、化学量論、分子構造、元素の性質。
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consider the isotope notation shown. $\\ce{^{45}_{21}sc}$ how many neut…
24 (corresponding to the option with 24, e.g., if the option is labeled as B. 24, then B. 24)
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consider the isotope notation shown. \\(\\ce{^{45}_{21}sc}\\) how many …
21 (corresponding to the option with 21, e.g., if the option is labeled as, say, C. 21, then C. 21)
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consider the isotope notation shown. \\(\\ce{^{45}_{21}sc}\\) how many …
21 (corresponding to the option "21")
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consider the isotope notation shown. $\\ce{^{13}_{6}c}$ how many neutro…
7 (corresponding to the option with 7)
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consider the isotope notation shown. \\(\\ce{^{13}_{6}c}\\) how many el…
A. 6
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consider the isotope notation shown. $ce{_{6}^{13}c}$ how many protons …
6
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how many isotopes are represented for the element in this mass spectrum…
Wait, the x - axis is 81, 83, 85, 87, 89. The peaks are at 85, 87, 89. So three peaks. So the number of isotopes is 3? No, wait maybe the first peak (small) at 85, then a peak at …
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the mass spectrum shows the stable isotopes for an element. what elemen…
C. Sr
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what element does this graph most likely represent? unknown element rel…
Titanium
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Question was provided via image upload.
Bromine
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what is the average atomic mass of this element based on the data? isot…
91.32
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how many isotopes are present for this compound? unknown element percen…
B. three isotopes
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calculate the average atomic mass for this element. isotope - mass | pe…
The average atomic mass of the element is approximately $87.71$ (units are atomic mass units, usually).
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read the excerpt from \sonnet 29\ when, in disgrace with fortune and me…
abab
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how is a poems rhyme scheme marked and identified? upper or lowercase l…
A. upper or lowercase letters, such as "ABAB"
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markus is reading a sonnet by william shakespeare. which will best help…
finding a single concept that links the lines together
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read the excerpt from ovids \pyramus and thisbe\. the blood leaped high…
The figurative language describes the violence of the scene.
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question 4 the ______________ states that matter is neither created nor…
1. Question 4: Law of Conservation of Mass 2. Question 5: bubbles, temperature change 3. Question 6: 112
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Question was provided via image upload.
(Question 5): Yes, the masses obey the Law of Conservation of Mass (LCM). The total mass of reactants ($80\ \text{amu}$) equals the total mass of products ($80\ \text{amu}$), so m…
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do the following for questions 2-5: count the atoms of each element and…
2. Balanced equation: $\boldsymbol{2\text{NaCl} ightarrow 2\text{Na}^+ + 2\text{Cl}^-}$ (add 1 more $\text{Na}^+$ particle to the products) 3. The given coefficient 2 for $\text{H…
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question 10 10 pts in part 2 of the lab you practice balancing chemical…
Yes
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question 8 when looking at the chemical reaction below, the 2 in front …
Question 8: There are 2 water molecules Question 9: No
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question 3 10 pts the sodium bicarbonate and acetic acid are examples o…
Question 3: A. Reactants Question 4: B. Law of Conservation of Mass
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question 1 10 pts in the lab, mixing the sodium bicarbonate and acetic …
gas, increases
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what is a structural characteristic of a litany poem? (1 point) the sta…
Many lines or stanzas begin with the same word or phrase.
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57. draw the correct lewis structure, determine shape and polarity of t…
See the detailed breakdown above for Lewis structures, geometries, and polarities of $\ce{OCl2}$, $\ce{SO2}$, $\ce{NH4+}$, $\ce{PCl3}$, $\ce{NO2-}$, and $\ce{CH2Cl2}$.
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question 2 2 pts incineration is a waste management process that can ge…
If inorganic material is incinerated, toxic ash might be produced.
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organic chemistry problem set – unit assignment you may refer to your c…
### 1a) Structural Diagram of Octane # Explanation: ## Step1: Determine Formula Octane is an alkane with 8 carbons, formula $C_8H_{18}$. ## Step2: Draw Carbon Chain Draw a straigh…
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the metal bar shown is an alloy of silver and other metals. 7.5 ounces …
0.675 ounces
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3 who first formulated the law of conservation of matter? a isaac newto…
3. c. Antoine Lavoisier 4. c. Mass remains constant 5. b. The molecules change state but remain present 6. c. It emphasizes the rearrangement of atoms rather than their creation o…
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electron is working on a formula that will turn trash into fuel. he nee…
3 ounces
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element | reactant | product h | 4 | 4 o | 2 | 2 are both sides of the …
1. Yes, both sides of the equation are equal (4 H atoms and 2 O atoms on each side). 2. Yes, this equation follows the law of conservation of matter, as the number of each type of…
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for the following reactions, recall the concepts for balancing equation…
### Part a: | Reactants | | | | Products | | | | |--|--|--|--|--|--|--|--| | $\boldsymbol{6CO_2}$ | C: 6 | O: 12 | $\boldsymbol{6H_2O}$ | H: 12 | O: 6 | | | | $\boldsymbol{C_6H_{1…
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10. for the chemical reactions below, label the reactants and products …
## Part a Missing Mass: $206.8\ \text{g}$ Does this equation follow the Law of Conservation of Matter? Yes ## Part b Missing Mass: $37.1\ \text{g}$ Does this equation follow the L…
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8. what are the potential environmental consequences if construction st…
- Sedimentation in water bodies: Smothers aquatic habitats, reduces water clarity, and harms aquatic life. - Water pollution: Pollutants (chemicals, oil, grease) from construction…
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video game sales hit $43.4 billion in 2018. since video games are so po…
a. by explaining the positive and negative effects of video games
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ch3—ch2—ch2—c≡c—ch3
To determine the name of the compound \( \text{CH}_3 - \text{CH}_2 - \text{CH}_2 - \text{C} \equiv \text{C} - \text{CH}_3 \), we follow these steps: ### Step 1: Identify the longe…
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part ii. bond polarity and intermolecular force polarity can determine …
For the interaction between \( \ce{H2S} \) and \( \ce{H2O} \), the intermolecular force is Dipole - dipole force.
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2. you must use both heat and chemicals to properly sanitize kitchen eq…
False
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penelope conducted a scientific experiment. for a certain time, the tem…
\(2\)
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alang conducted a scientific experiment. for a certain time, the temper…
\(3\)
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given the following atomic symbol. answer the following questions. \\(_…
- Isotope name: Iron - 55 - Number of Protons: 26 - Number of Electrons: 30 - Number of Neutrons: 29 - Ion: anion (B. anion, if we consider the options as A. cation, B. anion, C. …
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given the following atomic symbol. answer the following questions. \\(_…
Scandium - 45 ### Number of Protons
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4. briefly describe the important experiment and/or contribution to the…
### Question 4 a) Democritus: First proposed that all matter is made of indivisible, indestructible particles called atoms (named "atomos"). b) Dalton: Developed the first scienti…
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the graph shows the amount of a chemical in a patients body at differen…
Yes, the chemical could be decaying exponentially. The amount of the chemical is multiplied by a constant factor of 0.6 each hour, which is the defining characteristic of exponent…
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_fepo₄ + _mgo → _mg₃(po₄)₂ + _fe₂o₃ ○ 1,1,2,3 ○ 2,3,1,1 ○ 3,2,1,0 ○ 2,1…
2, 3, 1, 1 --- ### Second Question (Identifying Incorrectly Balanced Equation)
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step 1: get on board everyone has a role in safety a new job is a chanc…
1. New and young workers $\square$ (checked) Why? New and young workers often lack knowledge of job hazards, don't know what to expect, and aren't sure who to ask for safety infor…
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2 the graph shows the amount of a chemical in a water sample. it is dec…
- Point A: $(2, 640)$ - Point B: $(3, 512)$ - Point C: $(4, 409.6)$
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mixture or pure substance? mixture pure substance
mixture
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2 the graph shows the amount of a chemical in a water sample. it is dec…
- Point A: (2, 700) - Point B: (3, 600) - Point C: (4, 500) --- ### Second Problem (Select True Statements)
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what will be the total number of oxygen atoms on either side of the che…
1. 10 2. 1, 2, 1, 1
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is this a mixture or a pure substance? pure substance mixture
mixture (the purple button labeled "mixture")
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how many oxygen atoms will be on the reactant side of the chemical equa…
1. 15 2. 3, 1, 2, 3
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question 8 (1 point) in the reaction: $\\ce{kno_{3}(aq) + pbso_{4}(aq) …
there is no reducing agent
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question 2 (1 point) identify the oxidizing agent in the reaction: $ce{…
B. \( \text{O}_2(\text{g}) \)
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question 1 (1 point) what is the correct balanced net ionic equation fo…
\( \boldsymbol{\text{Fe}^{2+}(\text{aq}) + \text{Ni}(\text{s}) ightarrow \text{Fe}(\text{s}) + \text{Ni}^{2+}(\text{aq})} \) (corresponding to the option: \( \text{Fe}^{2+}(\text{…
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elements that act like both a metal and a nonmetal are called _______. …
C. metalloids
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type the number of the coefficient needed to balance the number of oxyg…
1. 5 2. 2, 1, 1, 2
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the atomic number of the element is the same as the the number of _____…
A. protons
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2/14 each box on the periodic table represents one atom of that element…
One atom of that element
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complete the sentence with the best correlative conjunctions. on earth,…
not only... but also
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read the following sentences from the section \chemical reaction defini…
They both help to clarify what a chemical reaction is by distinguishing it from other types of reactions.
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is the author of the article suggesting that unbalanced chemical equati…
Yes; "An unbalanced chemical equation doesn't account for conservation of matter, but it's often a good starting point because it lists the products and reactants and the directio…
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how does wildfire help restore soil nutrients? a. wildfire kills off th…
d. All of the above
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unit: electron configurations \electron configurations for ions\ direct…
1. N (long): $1s^2 2s^2 2p^3$; N (abbreviated): $[He] 2s^2 2p^3$ N⁻³ (long): $1s^2 2s^2 2p^6$; N⁻³ (abbreviated): $[Ne]$ Which neutral atom is isoelectronic with N⁻³?: Neon (Ne) H…
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dr. bhatia mixes 2 liters of a 5% saline solution with x liters of a 9%…
6 (corresponding to the option with 6, e.g., if the options are A.3, B.4, C.5, D.6, then D.6)
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question 9. student 4: added powdered sugar in ice - cold water and sti…
D. Student 4 because stirring with powdered sugar helps it dissolve.
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maki uses 20 gallons of a solution with an unknown ethanol concentratio…
0.04
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when preparing a concentrated nacl solution, a student dissolves 20 gra…
C. Add more NaCl to the solution without changing the amount of water.
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a 4% peroxide solution is mixed with a 10% peroxide solution, resulting…
8
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question 6. baking soda is in a balloon. vinegar from the attached ball…
B. A chemical change occurred because a gas was produced.
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question 5. mass: 200 g clear mass: 200 g mass: 400 g the student can c…
A. A solid formed when the two liquids were mixed.
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a chemist is analyzing the composition of caffeine, which has the chemi…
D. There are more nitrogen atoms than oxygen atoms.
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question 3. ascorbic acid is a naturally occurring compound with antiox…
C. 6 carbon, 8 hydrogen, 6 oxygen
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question 2. which of the following statements accurately describes the …
B. Elements comprise only one type of atom, while compounds contain two or more types of atoms chemically combined. E. Elements are represented by chemical symbols, while compound…
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11. a forklift is used to lift a large 704 kg crate a distance of 5.54 …
Approximately \( \boldsymbol{47.5\%} \) (assuming a possible typo in mass, as 704 kg gives impossible efficiency) ### Question 12
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question 1, - diamond ring (c) - table sugar (c₁₂h₂₂o₁₁) - helium ballo…
A. Diamond ring: Element, Table sugar: Compound, Helium balloon: Element, Rust: Compound
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11. a forklift is used to lift a large 704 kg crate a distance of 5.54 …
# Explanation: ## Step1: Calculate useful work done (lifting the crate) The work done in lifting an object is given by \( W = mgh \), where \( m = 704\space kg \), \( g = 9.8\spac…
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chapter outline continued a. nonmetals do not have luster, cannot be ea…
To solve these fill - in - the - blank questions, we rely on the knowledge of Chemistry (a subfield of Natural Science), specifically the concepts related to the periodic table, e…
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synthesis (s) or decomposition (d) ? 1) \\( \\text{p}_4\\text{o}_{10(\\…
D ### 2)
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synthesis (s) or decomposition (d)? 1) \\(\\ce{p4o10(s) -> p4(s) + 5o2(…
D (Decomposition), as one compound ($\ce{P4O10}$) breaks into simpler substances ($\ce{P4}$ and $\ce{O2}$). ### 2)
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6. when chlorine gains an electron from sodium, what is the charge of t…
c) Negative ### Question 7
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directions: use the video to answer the following questions. video: htt…
b) Neutrons, protons, and electrons ### Question 2
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3. a compound is made of materials that are chemically combined in a fi…
3. C. Each substance in a mixture keeps its individual properties 4. B. Every atom present in the reactants is also present in the products 5. C. $\text{C} + \text{O}_2 ightarrow …
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bell work - thursday, jan. 8, 2026 write the letters of the correct ans…
1. A. Reaction 1 advantages: produces plenty of heat; Reaction 2 advantages: produces a more moderate temperature, is resuable 2. D. Chemical changes produce new substances.
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passage poems publius ovidius naso, known as ovid in english literature…
by comparing the passage of time to waves breaking on the shore
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14. part 1 construct your multiple choice prompt here. ammonium nitrate…
A. \(NH_4NO_3\)
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what products will form from a given set of reactants? pb(no₃)₂ (aq) + …
$\boldsymbol{\ce{NaNO_{3}(aq) + PbI_{2}(s)}}$ (assuming the first option has a typo and should be this, or if the first option is $\ce{NaNO_{3}(aq) + PbI_{2}(s)}$ then that is the…
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12. if you want to dissolve 40.2 g of kcl in 100 g of water, what tempe…
60°C (Option: 60°C)
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general steps 1. count all bonds to get the number of sigma bonds 2. ad…
Sigma bonds: \(\boldsymbol{4}\), Pi bonds: \(\boldsymbol{2}\)
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11. the graph shows various compounds solubilities as a function of tem…
C. KCl
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3. use hesss law and the equations given below to determine the molar e…
The molar enthalpy of the reaction \(2H_2S(g)+3O_2(g) ightarrow2SO_2(g)+2H_2O(l)\) is \(\boldsymbol{-1124\ kJ}\)
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9. the figure displays two types of bonding. which type of bonding is r…
C. hydrogen
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balance these equations ____na₃po₄ + ____koh → ____naoh + ____k₃po₄ ___…
1. $\boldsymbol{\text{Na}_3\text{PO}_4 + 3\text{KOH} ightarrow 3\text{NaOH} + \text{K}_3\text{PO}_4}$ (coefficients: 1, 3, 3, 1) 2. $\boldsymbol{2\text{C}_8\text{H}_{18} + 25\text…
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your turn, from structure to sigma and pi counts the organic chemistry …
To solve for the number of sigma ($\sigma$) and pi ($\pi$) bonds in each molecule, we analyze their structures: ### 1. Ethene ($\boldsymbol{\ce{C2H4}}$) Ethene has a double bond (…
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2. the haber process is a very valuable chemical reaction for the indus…
1. **Increase Temperature**: Higher temperature increases reactant molecules’ kinetic energy, causing more frequent and energetic (effective) collisions. 2. **Increase Pressure (o…
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histamine atom counts element\ttotal # atoms carbon\t<xxx> hydrogen\t<x…
To determine the atom counts for histamine (\( \text{C}_5\text{H}_9\text{N}_3 \), since histamine's molecular formula is \( \text{C}_5\text{H}_9\text{N}_3 \) and there is no oxyge…
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ionic bonds - do now in class draw lewis dot diagrams for the following…
1. NaF: $\text{Na}^+ \ [\cdot \underset{\cdot \cdot}{\overset{\cdot \cdot}{\text{F}}} \cdot]^-$ 2. BaCl₂: $\text{Ba}^{2+} \ 2[\cdot \underset{\cdot \cdot}{\overset{\cdot \cdot}{\t…
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show all of your work for full marks (aoking problems, including units,…
The thermodynamic property responsible is the high specific heat capacity (and density anomaly) of water. The large volume of water in Lake Ontario requires a massive amount of he…
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a. what are the three main ways that solid waste is handled in the us? …
a. 1. Landfilling (disposing waste in designated sites) 2. Recycling/composting (processing materials for reuse or organic decomposition) 3. Incineration/waste-to-energy (burning …