Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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multiple choice question a link between two atoms formed by sharing ele…
O bond
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____ are hydrocarbons that contain a halogen such as cl, f, i, or br. a…
A. Alkyl halides
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____ are compounds made up of only the elements carbon and hydrogen, wh…
C. Alkenes
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____ are compounds made up of only the elements carbon and hydrogen, wh…
B. Alkanes
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12. if an aqueous solution has a hydroxyl ion concentration of $10^{-2}…
$1.0\times10^{-12}\ \text{M}$
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10. calculate the ph of a solution that is 0.153 m hcl. √3
0.815
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if the reaction begins with 1.00 m of h₂ and f₂ and no hf, calculate th…
### First ICE Table and Results: | | $\text{H}_2$ | $\text{F}_2$ | $2\text{HF}$ | |------------|--------------|--------------|--------------| | Initial | $1.00\ \text{M}$ | $1.00\…
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write the keq for the following reactions: 1n₂(g) + 3 h₂(g) → 2 nh₃(g) …
1. $K_{eq} = \frac{[\text{NH}_3]^2}{[\text{N}_2][\text{H}_2]^3}$ 2. $K_{eq} = \frac{[\text{HBr}]^2}{[\text{H}_2][\text{Br}_2]}$ 3. $K_{eq} = [\text{CO}_2]$ 4. $K_{eq} = \frac{[\te…
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write the keq for the following reactions: 1n₂(g) + 3 h₂(g) → 2 nh₃(g) …
1. $K_{eq} = \frac{[\ce{NH3}]^2}{[\ce{N2}][\ce{H2}]^3}$ 2. $K_{eq} = \frac{[\ce{HBr}]^2}{[\ce{H2}][\ce{Br2}]}$ 3. $K_{eq} = [\ce{CO2}]$ 4. $K_{eq} = \frac{[\ce{NH3}]^2}{(1.5)[\ce{…
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what do these two changes have in common? filtering air to remove dust …
Both are only physical changes.
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4. what types of noncovalent interactions hold together the following s…
(a) Ionic interactions (electrostatic attractions between $\text{Na}^+$ and $\text{Cl}^-$ ions) (b) London dispersion forces (van der Waals forces between carbon sheets)
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what do these two changes have in common? mixing glue and laundry powde…
- Both conserve mass.
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question: after exploring some of the videos and topic readings, what i…
The process of measuring the amount of heat released or absorbed during a chemical reaction. (The third option in the list)
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what do these two changes have in common? salt and vinegar removing tar…
Both conserve mass.
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what do these two changes have in common? water vapor condensing on a b…
- Both are caused by cooling. - Both are changes of state.
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multiple choice question for which audience would it be most important …
B. High school students
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what do these two changes have in common? building a tower out of magne…
Both are only physical changes.
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what do these two changes have in common? burning a marshmallow over a …
Both are chemical changes.
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what do these two changes have in common? sediment settling to the bott…
Both are only physical changes.
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14. use the vsepr theory to predict the molecular geometry of the follo…
a. NF₃: Trigonal pyramidal b. SiO₂: Linear c. CH₄: Tetrahedral
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10. convert one-hundred degrees celsius to kelvin. 11. convert sixty-fo…
1. $373.15$ K 2. $\approx 17.78$ $^\circ C$ 3. $260.15$ K 4. The preferred temperature scale used in scientific laboratories is the Kelvin scale.
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name per date 20. $\\ce{c3h8 + o2 -> co2 + h2o}$ 21. $\\ce{fe2o3 + co -…
20. $\text{C}_3\text{H}_8 + 5\text{O}_2 ightarrow 3\text{CO}_2 + 4\text{H}_2\text{O}$ 21. $\text{Fe}_2\text{O}_3 + 3\text{CO} ightarrow 2\text{Fe} + 3\text{CO}_2$ 22. $2\text{NaHC…
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part a write the conversion factor from grams to pounds. express your a…
$0.002205$ lb
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exercise 2.79 - enhanced - with feedback missed this? watch kcv: conver…
Part C: $2.294 \times 10^{13}\ \text{mg}$ Part D: $2.294 \times 10^{4}\ \text{metric tons}$
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missed this? watch kcv: converting between units, iwe: unit conversion.…
Part A: $2.294 \times 10^{7}\ \text{kg}$ Part B: $2.294 \times 10^{4}\ \text{Mg}$
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#7 an aqueous solution of zncl₂ is 0.118 mf zncl₂. the density of the s…
Normality of $\text{ZnCl}_2$: $0.236\ \text{N}$ Molality of $\text{ZnCl}_2$: $0.106\ \text{m}$
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22.1 in. to centimeters express your answer to three significant figure…
Part A: 56.1 centimeters Part B: 34.7 meters
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part a how many microliters are in 41.0 ml? 0.041 4.1 × 10^10 4.10 × 10…
4.10 × 10⁴
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part c iron has a density of 7.86 g/cm³ (1 cm³ = 1 ml). calculate the v…
$4.10$ dL
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using density as a conversion factor aluminum has a density of 2.70 g/m…
894
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using the relationship between mass and volume in density, determine wh…
| Given Value | Need | Conversion Factor | |-------------|------|-------------------| | 5.0 g | mL of sample | $\frac{1\ \text{mL}}{X\ \text{g}}$ | | 55 mL | g of sample | $\frac{…
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multiple-choice question which type of matter can be physically separat…
mixtures
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missed this? read section 2.10. you can click on the review link to acc…
\(1.26\ \text{g/cm}^3\)
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how many different substances make up a heterogeneous mixture? one elem…
2 or more
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in a homogeneous mixture everything is going to be located where? split…
spread equally around
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a pure substance is made up of what? one type of element or molecule mo…
one type of element or molecule
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what is a molecule? □ more than one type of atom bonded together. □ lot…
More than one type of atom bonded together.
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when do zeros count as significant digits, and when do not they count? …
1. Zeros at the end of a number with a decimal point: ARE significant 2. Zeros at the end of a number with no decimal point: are ambiguous 3. Zeros at the beginning of a number: a…
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how much of a radioactive kind of promethium will be left after 265 hou…
484
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how much of a radioactive kind of bismuth will be left after 8 minutes …
4960
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final passage requires just a simple majority so democrats should trium…
prevail
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6. match the definitions with the color scheme types. - a color scheme …
To solve this, we match each definition to the correct color scheme type by recalling color theory: 1. **"a color scheme that uses colors that are opposite of each other on the co…
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in the lab, greg has two solutions that contain alcohol and is mixing t…
600
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2. create a model of aluminium-13 isotope statements to help guide you:…
- The atomic number of Aluminum is $\boldsymbol{13}$. - Aluminum has $\boldsymbol{13}$ protons. - Aluminum -13 has $\boldsymbol{0}$ neutrons because $13 -$ the number of protons $…
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fill in the blank question mass is not or lost during any chemical chan…
First blank: created Second blank: destroyed
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answer in complete sentences 1. what is mummification? why did the anci…
Mummification is an ancient preservation process that involves treating a dead body with chemicals, wrapping it, and using other methods to slow or stop decomposition so the body …
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student exploration: chemical changes vocabulary: acid, base, catalyst,…
### Prior Knowledge Questions 1. **Answer & Explanation**: - **Brief Explanations**: When baking soda (sodium bicarbonate) and vinegar (acetic acid) are mixed, a chemical reaction…
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student exploration: chemical changes vocabulary: acid, base, catalyst,…
**: Yes, new substances are being created. We know this because bubbles (gas) are produced, indicating a chemical reaction where reactants are transformed into new products. 2. **…
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13. communicate and justify during a chemistry experiment, julian recor…
Independent variable: Time (in minutes) because it is the variable that is controlled or changed in the experiment. Dependent variable: Temperature (in \(^\circ\text{C}\)) because…
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email to xjimenez@mustangsla - select the element that is not a halogen…
a) Rg
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• rule 1: all nonzero digits are significant. • rule 2: zeros between t…
A) 3 sf B) 3 sf C) 4 sf D) 3 sf E) 6 sf F) 5 sf G) 7 sf H) 4 sf I) 6 sf J) 5 sf --- ### Part 2: Exact vs Measured Numbers
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5. write electron configurations for the following. a. calcium b. zirco…
\(1s^2 2s^2 2p^6 3s^2 3p^6 4s^2\) or \([Ar]4s^2\) (where \([Ar]\) is the electron configuration of argon, \(1s^2 2s^2 2p^6 3s^2 3p^6\)) ### Part b: Zirconium (Zr)
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1. outline the trends of the periodic table for ionization energy, atom…
(a) F (Fluorine) (b) Claim: Mg (Magnesium) is the smallest metal radius. Evidence: Mg has 3 energy levels; Cs has 6. Reasoning: Fewer energy levels mean stronger nuclear attractio…
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what determines periodicity in the modern periodic table? the number of…
C. The electron configuration
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who is credited with the discovery of phosphorus, the fifteenth element…
Hennig Brandt
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what did john dalton propose in 1803? he theory of relativity the exist…
D. Atoms were at work in chemical reactions
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lesson 3 electron configurations practice date period multiple choice 1…
d. 7 ### Question 2
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what was the first man - made element? einsteinium technetium flerovium…
B. Technetium
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what is the main reason scientists continue to hunt for new element to …
A. To explore what is possible
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what was the main ingredient in hennig brandt’s recipe for phosphorus? …
A. Processed urine
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5 9.1: a whole lot of paper clips what is the relationship between kilo…
1 kilogram = 1000 grams
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a cone - shaped container has a height of 240 in. and a radius of 150 i…
471
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what is the main cause of plastic pollution in the ocean? chemical runo…
D. trash entering the ocean from land (assuming the options are labeled A - D with D being this option; if labels are different, adjust, but the content is "trash entering the oce…
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close read: analyze the text identify the choice that best answers the …
Part A: C. He will not allow a well-mannered guest to be insulted in his home. Part B: A. To be a virtuous and well-governed youth. / I would not for the wealth of all this town /…
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first. then determine whether that is a pure substance or mixture. a pu…
For row 4 (matching diagram 3): - # OF DIFFERENT SUBSTANCES: 1 - PURE SUBSTANCE OR MIXTURE: Pure Substance - ELEMENT, COMPOUND OR MIXTURE: Element
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build, forming new substances like smoke and ash. 4. a metal object is …
1. For Question 4: - This is a chemical reaction; atomic-level changes include oxidation of metal atoms. 2. For Question 5: - Atomic structure (valence electrons, atomic radius) p…
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select the correct answer from each drop - down menu. a certain atom ha…
- Después de perder un electrón: \( +4 \) - Después de ganar 3 electrones: \( 0 \)
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2. using the periodic table, predict which element would have similar c…
1. Elements like sulfur (S), selenium (Se), tellurium (Te), or polonium (Po) (most commonly sulfur) have similar chemical properties to oxygen. 2. In a physical change (dissolving…
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read the text. does your shampoo leave your hair dry or damaged? flat a…
to persuade readers to buy Organi - Goo
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questions: 1. a student observes that when two clear liquids mix, the s…
1. This is a chemical reaction. 2. (Note: The second question is incomplete; please provide the full prompt for question 2 to get a complete answer.)
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type the correct answer in the box. a certain sample of a liquid has a …
1.2
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6. how does the number of valence electrons relate to an element’s posi…
The number of valence electrons of an element is directly tied to its group (vertical column) on the periodic table: 1. For main group elements (Groups 1-2, 13-18), the number of …
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select all the correct images. which images show a container holding a …
Las imágenes que muestran un recipiente con una mezcla heterogénea son: - El plato de sopa (segunda imagen, arriba a la derecha). - El tarro de monedas (tercera imagen, abajo a la…
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select the correct answer from each drop - down menu. an element belong…
First drop - down: dull Second drop - down: nonmetal
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drag each the to the correct location. classify each substance as a pur…
(Drag to Columns): - **Pure Substance** column: copper, which consists of only one kind of atom carbon dioxide, which has two atoms of oxygen for each atom of carbon table salt, w…
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select the correct answer lars observes a substance to be a solid and t…
B. cetyl alcohol
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19. dust, smoke, sea spray (salt) and other chemicals are examples of ,…
aerosols (or particulates, or atmospheric particles)
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using each tile to the correct location. which type of change does the …
To solve this, we analyze the characteristics of physical and chemical changes: ### Physical Change (Cambios Físicos) - **“Particles retain their composition and identity”**: In p…
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19. dust, smoke, sea spray (salt) and other chemicals are examples of ,…
particulates (or "particulate matter")
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justin mixed two clear liquids together during an experiment and made t…
B. A chemical change occurred, and this caused the liquid’s physical properties to change
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select all the examples of a chemical change. ice melting nail rusting …
B. nail rusting, C. bread baking, D. wood burning, E. milk spoiling
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read the text. when a person ingests caffeine, whether in the form of a…
sequential
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part 4: complete the following questions 1) a gas behaves like an ideal…
Let's solve these questions one by one: ### Question 1 - An ideal gas behaves ideally at **low** pressure and **high** temperature (because at low pressure, the volume of gas mole…
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which of the following are negative impacts on land resources caused by…
- erosion increase due to road construction - chemicals used in mining entering the soil - desertification caused by deforestation
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Question was provided via image upload.
1) valence; electron pairs; both bonded atoms 2) nonmetals; nonmetals; Octet; 8; Duet 3) (Lewis structure provided as example, complete with lone pairs: ``` H ·· H··C··H ·· H ``` …
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extension: volume and density get the gizmo ready: - press chill until …
1. A. Float 1. B. Rise 1. C. Densest: Liquid water; Least dense: Water vapor 2. A. No, liquid water takes up less space 2. B. Water vapor 2. C. Densest: Liquid water; Least dense:…
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5 multiple answer 1 point which of the following might an academic work…
- Examining how Paleolithic people used the natural texture of caves as a foundation for their cave paintings to understand their painting process and the role the images may have…
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activity b: comparing phases get the gizmo ready: - click chill until t…
1. A. Solid (ice) B. Liquid (water) and Gas (water vapor) 2. | Solid | Liquid | Gas | |-------|--------|-----| | Tightly packed, ordered lattice of molecules (e.g., small circles …
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2. a phase is a state of matter, such as a solid, a liquid, or a gas. w…
2. (Corrected): You can see solid (ice) and liquid (liquid water, condensed water droplets); water vapor (gas) is invisible. 3. Melting (solid to liquid), vaporization/boiling (li…
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but house or hald, to thole the winter’s sleety dribble, an’ cranreuch …
The poet's comparison of mice and humans in the final two stanzas shows that mice live only in the present, while humans (the speaker) are burdened by reflecting on the past and f…
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4. which quotation from the poem best highlights how the speaker views …
A. "I'm truly sorry Man's dominion / Has broken Nature's social union" (Lines 7 - 8)
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4) of the properties listed below for the metal magnesium, which would …
✓ ignites when heated
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what is the iupac name for the compound shown? iupac name:
2,2-dimethylpentane
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16) 300.0 g of water is at 12.0°c. the water absorbs 4016 j of heat ene…
$\boldsymbol{15.2^\circ\text{C}}$
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15) silicon, used in computer chips, has a heat capacity of 0.712 j g⁻¹…
$\boldsymbol{99.4\ \degree\text{C}}$ (Option: $\square$ 99.4 °C)
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13) 45.0 g of water is at 20.0°c. the water releases 2000 j of energy a…
$\boldsymbol{282\ \text{K}}$
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11) what is the specific heat of a solid that requires 124 j of heat to…
0.26 J/g°C
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10) a 250 g rod of tantalum absorbed 10.1 kj and changed temperature fr…
0.180 J/g°C
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9) how many joules of heat are required to heat 25.0 g of ethyl alcohol…
$\boldsymbol{2.99 \times 10^3\ \text{J}}$ (Option: $\square$ 2.99 x 10³ J)
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8) in the reaction ag(s) + 2 hno3(aq) → agno3(aq) + no(g) + h2o(l) the …
$\boldsymbol{\text{AgNO}_3(aq), \text{NO}(g), \text{H}_2\text{O}(l)}$