Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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4. identify the reaction type shown here. nacl + agno₃→ nano₃ + agcl sh…
Double Replacement (the option corresponding to "Double Replacement" in the choices, e.g., if it's a radio button or checkbox, select the one labeled "Double Replacement")
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3. identify the type of reaction shown here. s + cl₂ → scl₂ show the ty…
Combination
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6. what is the den 23 + 273.15 = 296.15k ch4: 12.01 + 4×1.008 = 16.042g…
0.716 g/L
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individual assignment progress: 38/53 answered score: 40 / 82 (48.78%) …
To solve this, we analyze each reaction type: ### Combination Reaction A combination reaction has the form \( \text{Element} + \text{Element} ightarrow \text{Compound} \). For exa…
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1. summarize the types of reactions by selecting a description of each …
- Combination: Two simple substances, often elements, react to form a single compound. - Decomposition: A single compound reacts to form two or more simpler substances. - Single R…
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1. summarize the types of reactions by selecting a description of each …
Combination: A Decomposition: B Single Replacement: C Double Replacement: D Combustion: E
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4. balance the equation for the combustion of ethanol by dragging the c…
1 \( \ce{C_{25}H_{52}} + 38 \ce{O_2} ightarrow 25 \ce{CO_2} + 26 \ce{H_2O} \)
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4. balance the equation for the combustion of ethanol by dragging the c…
The balanced equation is \( \boldsymbol{1}\ce{C_{25}H_{52}} + \boldsymbol{38}\ce{O_2} ightarrow \boldsymbol{25}\ce{CO_2} + \boldsymbol{26}\ce{H_2O} \) (coefficients: 1, 38, 25, 26)
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3. the candle is made of paraffin wax, $c_{25}h_{52}$. build the chemic…
\( \text{C}_{25}\text{H}_{52} + \boldsymbol{\text{O}_2} ightarrow \boldsymbol{\text{CO}_2} + \boldsymbol{\text{H}_2\text{O}} \) (The choices for the blanks are \( \text{O}_2 \) (s…
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2. in combustion reactions, a substance reacts with oxygen gas to produ…
\( \ce{C_{25}H_{52}} + \boldsymbol{\ce{O_2}} ightarrow \boldsymbol{\ce{CO_2}} + \boldsymbol{\ce{H_2O}} \)
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6. build the net ionic equation for the reaction that produces the lead…
1 \( \text{Pb}^{2+} \) + 2 \( \text{I}^- \) \( ightarrow \) 1 \( \text{PbI}_2 \)
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5. balance the double replacement reaction by dragging the correct coef…
The coefficients are: \( \text{Pb(NO}_3\text{)}_2 \): 1, \( \text{KI} \): 2, \( \text{PbI}_2 \): 1, \( \text{KNO}_3 \): 2. So the balanced equation is \( 1\text{Pb(NO}_3\text{)}_2…
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soluble. exceptions include li₂co₃ and li₃po₄. 2. nitrate (no₃⁻) salts …
\(Pb(NO_3)_2\) (aq) + \(KI\) (aq) \( ightarrow\) \(PbI_2\) (s) + \(KNO_3\) (aq) (Note: The original equation had a typo, it should be \(KNO_3\) not \(KI\) as a product. Correcting…
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3. the double replacement reaction is between aqueous lead(ll) nitrate …
\( \text{KNO}_3 \), \( \text{PbI}_2 \) (select the checkboxes for \( \text{KNO}_3 \) and \( \text{PbI}_2 \))
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2. in the double replacement reaction between aqueous lead(ll) nitrate …
Yellow
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which statement best describes the rhyme scheme of a thought on the ine…
There is an absence of a clear rhyme scheme.
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8. balance the equation for the reaction between potassium iodide and c…
2 KI + 1 Cl₂ → 2 KCl + 1 I₂ (So the coefficients are 2, 1, 2, 1 respectively for KI, Cl₂, KCl, I₂)
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7. build the chemical formula for the single replacement reaction that …
AD: KCl, B: I₂
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5. make a claim about which of the two reactions is successful. describ…
Claim: Reaction 1 ($KI + Cl_2 ightarrow$) is successful. Evidence: We observe the formation of purple iodine ($I_2$) when chlorine is mixed with potassium iodide solution. Reasoni…
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question 1 which statement is false? a. coumarins can not be found in n…
A. Coumarins can not be found in nature. We must synthesize them in the lab.
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1. review the powerpoint titled \simple machines and energy transfer\. …
the capacity to do work ### Part 2: Examples of Energy Types #### a) Kinetic Energy
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in the author to her book, the main reason bradstreet uses inversion is…
complete the rhyme scheme.
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3. consider an aqueous solution that is prepared with pure water and an…
a. decrease b. no effect c. increase d. increase ### Question 4a
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chem 303 - tuboul 5. sate & thermochemistry individual quiz (20 minutes…
C. The enthalpy of a reaction (in kJ) will depend on the quantity of products made during the reaction., D. A reaction with a positive value for enthalpy will take in energy from …
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(b) 500. ml of 0.500 m ba(no3)2 (c) 125 ml of 0.100 m sbcl3 (d) 250. ml…
1.14 L ### Problem 62
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lab data concentration of hydrochloric acid (m) 2.11 concentration of s…
$\approx - 58.0\ kJ/mol$ (rounded to three significant figures)
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check your volume measurement. did you report your data to the correct …
The volume of sodium hydroxide is approximately \( \boldsymbol{95.7 \, \text{mL}} \) (or \( 95.7 \) when reported to 3 significant figures, consistent with the data provided).
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check your volume measurement. did you report your data to the correct …
The volume of sodium hydroxide is approximately \(\boldsymbol{95.7 \, \text{mL}}\) (or \(96 \, \text{mL}\) if rounding to 2 significant figures, but 3 is more precise here).
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students conduct an experiment in which steel wool is burned in a close…
C. 43.49 g
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in an experiment, some magnesium ribbon is weighed and its mass is reco…
D. The mass of the magnesium oxide does not add up to the oxygen and magnesium.
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5. how much heat is needed to vaporize 25.0 g of water that is at -17.5…
The total heat needed is \( \boxed{7.70 \times 10^4 \, \text{J}} \)
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part a nuclear fusion, like the example here, produces huge amounts of …
B. Nuclear fusion begins when a large, unstable nucleus is bombarded with a smaller particle.
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4. how much heat is needed to boil 785 g of water that is at 17.6°c? (2…
The heat needed is approximately \( 2.04\times10^6\space J \)
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a large manufacturing company releases chemicals into the air every day…
A. habitat destruction due to pollution
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which is a nonpoint source of pollution? tourists throw trash into the …
Rain contains chemicals that seep into the ground.
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the models below represent atoms in different phases. what type of mode…
Particle Models
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which of the following is an example of a microscopic observation? ice …
The carbon atoms in graphite are arranged in a hexagonal lattice structure.
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bond polarity shows the polarity of bonds based on lectronegativity val…
It may oversimplify real - world conditions, making it harder to apply the understanding.
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which of the following is an example of a macroscopic observation? the …
A basketball is an orange sphere made from leather or rubber.
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which of the following describes the process of nuclear fusion as it oc…
The protons of Hydrogen atoms fuse together to create a new, larger element called Helium.
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the movement of water from the atmosphere to the ground is called which…
- First question: precipitation - Second question: nuclear fusion
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what is the value for the metric prefix \centi-\? 10³ 10⁻³ 10⁻² 10⁴
10⁻²
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what is the value for the metric prefix \deca - \? 10^{-3} 10^{3} 10^{-…
$10^1$
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what metric prefix matches this value? 10^{-1} kilo centi deci milli
deci
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what metric prefix matches this value? 10^{-2} kilo centi deci milli
centi
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what is the symbol for chlorine? c cl ch co
Cl
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what metric prefix matches this value? 10^1 kilo deci deca milli
deca
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what is the value for the metric prefix \milli-\? 10³ 10⁻³ 10⁻² 10¹
\(10^{-3}\)
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what metric prefix matches this value? 103 kilo centi deci milli
kilo
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name: compounds with polyatomic ions write the formula for each compoun…
### Part 1: Writing Formulas for Compounds with Polyatomic Ions #### a) Sodium Carbonate - Step 1: Identify ions. Sodium ($\text{Na}^+$), carbonate ($\text{CO}_3^{2-}$). - Step 2:…
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comparing ionic and covalent compounds use the chart to help you compar…
| Ionic compound | Both | Covalent compound | | --- | --- | --- | | A, C, F, G, I, K | B, E | D, H, J, L |
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15. choose the best answer. what phase of matter are all the compounds …
A. gas
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13 choose the best answer. what is the coefficient of o₂? 2 8 10 13 14 …
for Question 13: 13 (the option with 13)
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choose the best answers using the equation. 2c₄h₁₀(g) + 13o₂(g) → 8co₂(…
\(\text{H}_2\text{O}(g)\), \(\text{CO}_2(g)\) ### Question 12
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7. choose the best answer. when the following equation is balanced, wha…
2 (the coefficient for $LiBr$ is 2) ### Question 8
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5. choose the best answer. students observe the combustion reaction tak…
B. propane and oxygen ### Question 6
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for their lab report, students must describe a chemical reaction in wor…
The correct option is the one that states: "Solid copper and silver nitrate, dissolved in water, react to form aqueous copper nitrate and solid silver" (or the one with (II) if pr…
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1 choose the best answer. according to le chateliers principle, what wi…
The reaction will shift toward the products. (The option corresponding to this statement) ### Question 2
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vitamins/minerals study guide/review 20 pts possible 1. define vitamin.…
1. An organic compound essential for normal body function, not sufficiently synthesized by the body. 2. An inorganic element required for physiological processes, obtained from di…
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read the excerpts from samuel johnsons preface to a dictionary of the e…
strives to emphasize the effort his dictionary required
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part 2 (1 point) oxygen - 15 undergoes the decay shown in diagram (a). …
s: - Part 2: $\boldsymbol{_{8}^{15}\text{O} ightarrow_{7}^{15}\text{N}+_{+1}^0e}$ (or $_{8}^{15}\text{O} ightarrow_{7}^{15}\text{N}+_{+1}^0\beta$) - Part 3: $\boldsymbol{_{92}^{23…
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use the following information to answer the next question. a scientist …
Kr (since the molar mass of Kr is approximately \(83.8\text{g/mol}\))
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chemistry 20 final exam 2025 name: ebtesam acid base 42. if 3.4g of hcl…
\(0.54\)
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25110717h = 4869301 & p = 5a2f8606 final exam 2025 acid base use the fo…
\(2\space 3\space 1\space 4\)
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compounds match each term on the left with the best descriptor on the r…
1. E 2. C 3. F 4. B 5. D
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7. which of the following can be formed when there is electron transfer…
C. ionic bond ### Question 8
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name: assessment section 3.1 7. which of the following can be formed wh…
### Question[SSE Completed, Client Connection Error][SSE Completed, Client Connection Error][LLM SSE On Failure]
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22) vitamin b complex encompasses all of the following vitamins except …
22) b) Ascorbic Acid 23) c) They are inorganic chemicals important to a balanced diet 24) a) Water-soluble vitamins 25) c) Guinea Pig 26) c) Calcium 27) a) True 28) a) Avidin 29) …
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final exam 2025 solutions: use the following information to answer the …
$51.9\space g$
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water pollution water pollution is a growing problem in many parts of t…
Problem and solution
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for the following reaction in aqueous solution, identify the species th…
E. \( \text{K}^+ \), F. \( \text{OH}^- \)
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final exam 2025 solutions 29. a substance dissolves in water to form a …
neutral ionic substance that has dissociated in solution
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chemistry 20 final exam 2025 gases 25. the volume of oxygen consumed at…
2.31 × 10⁴ L (the volume of a small garage)
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chemistry 20 final exam 2025 name: ebiesari gases 21. the volume of a f…
3T
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chemistry 20 name eltesaam final exam 2025. gases use the following inf…
3.49 mol
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chemistry 20 final exam 2025 name: editesam gases use the following inf…
198
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chemistry 20 final exam 2025 name: ebtesam gases 21. the volume of a fi…
3T
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chemistry 20 final exam 2025 name: ebteasam gases use the following inf…
\(372\space mL\)
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chemistry 20 final exam 2025 name: ebteasam gases 19. if 3.00 g of oxyg…
2.10 L
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chemistry 20 final exam 2025 name: ebtesam gases 18. a gas is originall…
14V
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use the following information to answer the next question the unbalance…
\(7.65\)
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chemistry 20 final exam 2025 name: ebteisam gases 17. a balloon is fill…
contract, decrease
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use the following information to answer the next question limewater, ( …
0.0619 mol (closest to 0.062 mol)
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use the following information to answer the next two questions. the for…
14. \(6.40\) 15. \(70.3\)
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in this lab, you will start off by calculating the number of moles of a…
\(6.57\times 10^{-3}\space mol\)
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in this lab, you will determine the vapour pressure (p) of water at var…
\(25.8\space kJ/mol\)
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use the following information to answer the next question. the four mai…
1,4,3,2
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use the following information to answer the next question. compounds co…
I, III and IV
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3. as the non - metallic properties of atoms increase, the electronegat…
increase, decrease (the last row in the table)
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read the excerpt from \a modest proposal\ and the summary that follows.…
It does not effectively paraphrase the excerpt or correctly use a quotation.
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1. according to lewis dot theory, the nitride anion will have _ i _ val…
First row (8, 0)
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question 19 why would industry want to hydrogenate vegetable oils? a to…
B. to prolong the shelf life of foods
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based on what you know about trans - fats, which of the following is li…
First question: A. hydrogenated oils Second question: A. to stabilize food at room temperature, B. to prolong the shelf life of foods
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acid base 43. some household ammonia cleaning solution has a ph of 11.3…
\(2\), \(2\), \(4\), \(3\)
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use the following information to answer the next question. the hydrogen…
\(HCO_3^-(aq)+H_2O(l) ightleftharpoons CO_3^{2 - }(aq)+H_3O^+(aq)\)
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question 7 food companies can tag their products on the nutrition label…
Question 7: C. Hydrogenated oils Question 8: (Note: Diagram clarity is limited, but based on trans-fat structure definition, the option with hydrogens on opposite sides of the dou…
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9. consumption of which of the following is most likely to raise your h…
9. D. Polyunsaturated fats 10. A. cholesterol 11. (Depends on legible structure; assume the option with one double bond, e.g., if C has one double bond, then C)
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10 multiple choice 10 points what is the name of hc₂h₃o₂? acetic acid h…
acetic acid
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9 multiple choice 10 points when naming an acid with a polyatomic, that…
B. -ic
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8 multiple choice 10 points what is the name of hno₃? nitrate acid nitr…
C. nitric acid