化学
化学反应、化学计量、分子结构与元素性质。
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what is the last portion of the electron configuration for gallium, ga?…
4p¹
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what is the noble gas electron configuration for polonium? xe 6s² 5d¹⁰ …
[Xe] 6s² 4f¹⁴ 5d¹⁰ 6p⁴
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which is the correct electron configuration for the element phosphorus?…
1s² 2s² 2p⁶ 3s² 3p³
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what element does this orbital diagram represent? na ar ne k
Na
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what element does this electron configuration represent? $kr 5s^2 4d^{1…
I. Iodine (I)
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name: daniela torres count how many atoms for each compound or molecule…
1. $\text{NaHCO}_3$: 1 Na, 1 H, 1 C, 3 O 2. $\text{Mg(OH)}_2$: 1 Mg, 2 O, 2 H 3. $2\text{H}_2\text{SO}_4$: 4 H, 2 S, 8 O 4. $\text{C}_2\text{H}_4\text{O}_2$: 2 C, 4 H, 2 O 5. $3\t…
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count how many atoms for each compound or molecule $ce{nahco_{3}}$ $na=…
1. $\text{NaHCO}_3$: 6 total atoms (1 Na, 1 H, 1 C, 3 O) 2. $\text{Mg(OH)}_2$: 5 total atoms (1 Mg, 2 O, 2 H) 3. $2\text{H}_2\text{SO}_4$: 14 total atoms (4 H, 2 S, 8 O)
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physical science eams counting atoms count how many atoms for each comp…
- $\text{NaHCO}_3$: 6 total atoms (Na=1, H=1, C=1, O=3) - $\text{C}_2\text{H}_4\text{O}_2$: 8 total atoms (C=2, H=4, O=2) - $\text{Mg(OH)}_2$: 5 total atoms (Mg=1, O=2, H=2) - $3\…
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eams counting atoms date name count how many atoms for each compound or…
1. For $\boldsymbol{\text{NaHCO}_3}$: - Sodium ($\text{Na}$): 1 atom - Hydrogen ($\text{H}$): 1 atom - Carbon ($\text{C}$): 1 atom - Oxygen ($\text{O}$): 3 atoms - Total atoms: 6 …
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physical science eams counting atoms date name count how many atoms for…
1. For $\text{NaHCO}_3$: 6 total atoms (1 Na, 1 H, 1 C, 3 O) 2. For $\text{C}_2\text{H}_4\text{O}_2$: 8 total atoms (2 C, 4 H, 2 O) ### Molecule Drawing Notes: - $\text{NaHCO}_3$ …
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ms-ess2-1 develop a model to describe the cycling of earths materials a…
6. C. It is not a mineral because it doesn't have a crystal structure. 7. C. pressure
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Question was provided via image upload.
19. $\ce{Mg(OH)2 + 2HCl -> MgCl2 + 2H2O}$; Acid-Base Neutralization 20. $\ce{Na2CO3 + 2HCl -> 2NaCl + H2O + CO2}$; Double Displacement (Gas Evolution) 21. $\ce{NH4NO2 -> N2 + 2H2O…
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9. use the following chemical equation to solve the 3 step problem and …
Balanced equation: $3\text{Mg} + \text{N}_2 ightarrow \text{Mg}_3\text{N}_2$ a. $\approx 35\ \text{g}$ (rounded to 2 significant figures) b. Completed table: | Moles Mg | Moles N₂…
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7. complete the table using the following reaction. balance the equatio…
(Problem 7 Table): | Moles Fe | Moles O₂ | Moles Fe₂O₃ | Excess Fe | Excess O₂ | Limiting Reactant | |----------|----------|-------------|-----------|-----------|-----------------…
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Question was provided via image upload.
Balanced reaction: $2\text{Na} + \text{Cl}_2 ightarrow 2\text{NaCl}$ Theoretical yield of NaCl: $57.7\ \text{g}$ Limiting reactant: $\text{Cl}_2$
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Question was provided via image upload.
Limiting Reactant: $\text{O}_2$ (Oxygen gas) Theoretical Yield: $31.4\ \text{g}$ Percent Yield: $93.9\%$ Percent Error: $6.11\%$ Grams of excess reactant left over: $14.8\ \text{g…
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a solid oxide of lead, $\text{pbo}_2(s)$, reacts with $\text{h}_2\text{…
C. The Pb in $\text{PbO}_2$ is reduced.
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photoelectron spectrum identify the element in this pes graph. calcium …
Calcium
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6. what is the maximum amount (in grams) of nacl that can be produced f…
Balanced reaction: $\boldsymbol{2Na + Cl_2 ightarrow 2NaCl}$ a. Moles of Na: $\boldsymbol{\approx 1.96\ \text{mol}}$ b. Moles of NaCl from Na: $\boldsymbol{\approx 1.96\ \text{mol…
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Question was provided via image upload.
1. Mole ratio: $N_2:O_2:NO_2 = 1:2:2$ 2. Mole ratio: $SO_2:O_2:SO_3 = 2:1:2$ 3. 18 moles 4. a. $\frac{44}{3}$ (≈14.67) moles b. $\frac{4}{3}$ (≈1.33) moles c. 0 moles 5. Limiting …
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5. how many grams of carbon dioxide should be produced if 25.0 g of oct…
Theoretical yield of $\ce{CO2}$: $31.4\ \text{g}$ Percent yield: $93.9\%$ Percent error: $6.11\%$
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molarity mastery 2020.pdf making solutions..... 6. using the steps belo…
1. (For Question 6) a. Fill flask with half the needed volume of water. b. Add calculated mass of salt to water, stir to dissolve. c. Fill flask to the marked volume line. 2. (For…
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what is the chemical that refluxes into the esophagus, causing the burn…
Hydrochloric acid (HCl)
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molarity masterydiagramming the concept...1. use this diagram 2 m deter…
1. $\boldsymbol{0.5\ \text{M}}$ 2. Evaporate solvent to reduce the solution's volume to half of its original volume, or add an equal number of moles of calcium chloride to the ori…
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write the formula for these ionic compounds: iron (ii) chloride calcium…
1. Iron (II) Chloride: $\text{FeCl}_2$ 2. Calcium Oxide: $\text{CaO}$ 3. Sodium Sulfide: $\text{Na}_2\text{S}$ 4. Aluminum Nitride: $\text{AlN}$ 5. Magnesium Oxide: $\text{MgO}$ 6…
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16. what is the formula for iron (iii) bromide?febrfebr₂febr₃fe₃br17. w…
16. $\text{FeBr}_3$ 17. $\text{CaS}$ 18. $\text{PCl}_3$ 19. $\text{C}_2\text{F}_6$ 20. Nitrate 21. Magnesium nitride 22. Barium chloride 23. Dinitrogen pentoxide 24. Sulfur trioxi…
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7. what is the charge of a potassium ion? a) +1 b) -1 c) -2 d) +2 8. wh…
7. a) +1 8. c) -2 9. b) zero 10. 3+ is the charge 11. have 8 valence electrons 12. SO₂ 13. CaCl₂ 14. Ar 15. (OH)⁻
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unit 3 practice test/study guide 1. what type of solid can conduct elec…
1. Ionic compound 2. Metal 3. Ionic compound 4. Electrons are transferred between metals and nonmetals. 5. Atoms share electrons 6. two or more metals
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question 25 of 36 the boiling point of an aqueous solution is 102.01 °c…
$-7.30^\circ\text{C}$
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question 24 of 36 > imagine two solutions with the same concentration a…
$m = 0.420$ m $T_b = 78.9$ °C
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at -13.0 °c, a common temperature for household freezers, what is the m…
3090 g (rounded to 3 significant figures)
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question 22 of 36 a solution is made by dissolving 0.735 mol of nonelec…
$T_f = 1.1^\circ\text{C}$ $T_b = 82.3^\circ\text{C}$
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which of the following phase changes is the largest decrease in entropy…
1. deposition 2. melting
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which of the following phase changes is the largest increase in entropy…
1. sublimation 2. condensation
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question 21 of 36 calculate the freezing point of a 12.25$m$ aqueous so…
$-22.79^\circ\text{C}$ (rounded to two decimal places, or $-22.8^\circ\text{C}$ for reasonable precision)
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a solution is made by mixing 38.0 ml of ethanol, $ce{c_{2}h_{6}o}$, and…
21.7 Torr
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biphenyl, $\text{c}_{12}\text{h}_{10}$, is a nonvolatile, nonionizing s…
$81.9\ \text{Torr}$
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a chemist combined chloroform (chcl₃) and acetone (c₃h₆o) to create a s…
2.71 M
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who is the limiting reactant? ______ who is the excess reactant? ______…
1. Ecuación química balanceada: $\boldsymbol{\text{SiO}_2 + 3\text{C} ightarrow \text{SiC} + 2\text{CO}}$ 2. Reactivo limitante: $\boldsymbol{\text{SiO}_2}$ (el carbono está en ex…
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when 4.74 g of a nonelectrolyte solute is dissolved in water to make 15…
concentration: $0.0520$ M moles of solute: $0.00806$ mol molar mass: $588$ g/mol
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two beakers each contain 200 ml of water. into one beaker, a student ad…
The NaCl solution will have a higher boiling point than the KCl solution.
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if a 0.510 $m$ aqueous solution freezes at $-2.90\\ ^\\circ\\text{c}$, …
$3.06$
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question 34 of 36 assuming 100% dissociation, calculate the freezing po…
$T_f = -14.4^\circ\text{C}$ $T_b = 103.9^\circ\text{C}$
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when 12.3 g of an organic compound known to be 62.04% c, 10.4% h, and 2…
$\text{C}_6\text{H}_{12}\text{O}_2$
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a metal, m, of atomic mass 56 amu reacts with chlorine to form a salt t…
$\text{MCl}_2$ (or specifically, $\text{FeCl}_2$, since M has atomic mass 56 amu, iron)
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read the lines from \the tide rises, the tide falls.\along the sea-sand…
It strengthens the connection between the two lines.
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average chemical composition— set 1 —— set 2 —1. earths hydrosphere is …
1. (2) liquid water layer of Earth 2. (4) oxygen and silicon 3. (2) oxygen 4. (4) 5. (2) hydrogen 6. (1) iron 7. (1) the crust 8. (1) O and Si 9. (3) iron
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4. based on the following balanced equation, $2\\text{fe}(s) + 3\\text{…
a. +3 (Iron(III) ion, $\text{Fe}^{3+}$) b. $0.01398$ moles
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6) what is the percent yield of $\text{co}_2(g)$ if 46.5 grams of $\tex…
6. $\approx 64.0\%$ 7. $\approx 69.2\%$ 8. $\approx 129\ \text{g}$ (rounded to 3 significant figures) 9. $\approx 142\ \text{g}$ (rounded to 3 significant figures) 10. $\approx 92…
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write the balanced chemical formula for photosynthesis in symbols and w…
## In Symbols: ### Reactants: $6\text{CO}_2 + 6\text{H}_2\text{O}$ (plus light energy, chlorophyll) ### Products: $\text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2$ Balanced equati…
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3. based on the following balanced equation, fe (s) + cuso₄(aq) → feso₄…
a. +2 (or 2+) b. 0.009321 mol
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of 9.0 moles of potassium chlorate (kclo₃)? 4. ____ c₆h₆o + ____ o₂ → _…
0.8 moles of $\ce{O2}$ reacted.
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4. $\boldsymbol{2 c_6h_6o + 11 o_2 ightarrow 12 co + 6 h_2o}$ how many …
1.1 moles
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critical thinking: why is the number of valence outer shell electrons m…
(Visual description of the Bohr model: A central red oxygen nucleus, surrounded by a second electron shell with 8 electrons (4 as unpaired dots, 2 pairs each connected to a hydrog…
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periodic table literacy understanding element tiles before determining …
### Understanding Element Tiles #### Sodium - Atomic Number: $11$ - Symbol: $\text{Na}$ - Atomic Mass: $22.99$ #### Carbon - Atomic Number: $6$ - Symbol: $\text{C}$ - Atomic Mass:…
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read the poem. paul reveres ride by henry wadsworth longfellow (1) list…
It creates an eerie, suspenseful mood.
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name: date: 2/10/26 block: reading: the nature of chemical bondsreading…
| Ionic Bonds | Covalent Bonds | |-------------|----------------| | Forms via electron transfer | Forms via electron sharing | | Occurs between metal + non-metal | Occurs between …
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question① what is the name for the acid with the formula $\text{hno}_2$…
Nitrous acid
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question given the formula for borate as $bo_3^{3-}$, what is the formu…
$\text{H}_3\text{BO}_3$ (the second option)
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question ① what is the formula for chromous acid? answer $ce{h_{2}cr_{2…
$\text{H}_2\text{CrO}_2$
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question what acid is formed from the bromide ion? answer $h_2br$ $hbr$…
B. HBr
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question what is the name for the acid with the formula $h_3po_5$? answ…
Perphosphoric acid
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question ⓘ identify the formula for permanganic acid. answer $h_2mno_4$…
B. $\text{HMnO}_4$
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question ① which pair correctly matches the name for an acid with its f…
A. Sulfuric acid, $\text{H}_2\text{SO}_4$
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question 1 identify the formula for pernitric acid. answer hno hno₃ h₂n…
$\boldsymbol{\text{HClO}_4}$ (Note: correcting a potential typo in the options, as the intended correct formula for perchloric acid is $\text{HClO}_4$; if the last option was mean…
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questionwhat is the name for the acid with the formula hi?answeriodous …
Hydroiodic acid
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since the video is playing in reverse, this represents the solid produc…
The mass of $\text{NaHCO}_3$ required is approximately $\boldsymbol{3.57\ \text{g}}$, with the dimensional analysis filled as: $2.29\ \text{g}\ \text{Na}_2\text{CO}_3 \times \frac…
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question identify the formula for chromic acid. answer $hcro_4$ $h_2cro…
$\boldsymbol{\text{H}_2\text{CrO}_4}$ (the second option)
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show the dimensional analysis set-up needed to calculate the mass of na…
The complete dimensional analysis setup is: $2.29\ \text{g}\ \text{Na}_2\text{CO}_3 \times \frac{1\ \text{mol}\ \text{Na}_2\text{CO}_3}{105.99\ \text{g}\ \text{Na}_2\text{CO}_3} \…
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2. you used stoichiometry to predict how many grams of solid product wo…
Reaction 4 (the decomposition of $\text{NaHCO}_3$ to $\text{Na}_2\text{CO}_3$, $\text{CO}_2$, and $\text{H}_2\text{O}$) occurred, as its predicted solid product mass (4.1181 g) is…
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the diagram below is a model of two solutions. each yellow ball represe…
Solution B
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the diagram below is a model of two solutions. each purple ball represe…
Solution B
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20. if reaction #4 occurs, you calculated that 0.03885 moles $ce{na_{2}…
$4.1181$ g
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19. use the equation you built in the previous problem. calculate how m…
0.03885 mol
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18. construct the mole ratio needed to calculate how many moles of $ce{…
Filled equation: $0.0777\ \text{mole NaHCO}_3 \times \frac{1\ \text{mole Na}_2\text{CO}_3}{2\ \text{mole NaHCO}_3} = 0.03885\ \text{mol Na}_2\text{CO}_3$ Final moles of $\text{Na}…
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17. last one! predict the mass of the solid that remains if reaction #4…
The balanced coefficients (in order) are 2, 1, 1, 1. The coefficient for $\text{NaHCO}_3$ is $\boldsymbol{2}$.
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the diagram below is a model of two solutions. each pink ball represent…
Solution B
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16. if reaction #3 occurs, you calculated 0.03885 moles $ce{na_{2}o}$ w…
$2.408\ \text{g}\ \text{Na}_2\text{O}$
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the diagram below is a model of two solutions. each blue ball represent…
Solution A
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15. use the equation you built in the previous problem. calculate how m…
0.03885 moles of $\text{Na}_2\text{O}$
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fireworks operators usually fall into one of two camps: those who striv…
- Some people like loud fireworks. - Stunning visual effects are possible with fireworks.
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14. construct the mole ratio needed to calculate how many moles of $na_…
Filled calculation: $0.0777\ \text{mol NaHCO}_3 \times \frac{1\ \text{mol Na}_2\text{O}}{2\ \text{mol NaHCO}_3} = 0.03885\ \text{mol Na}_2\text{O}$ Final moles of $\text{Na}_2\tex…
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13. next, you will consider possible reaction #3. balance the chemical …
The coefficients (in order) are 2, 1, 2, 1.
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12. here is the summary of the two solids remaining if reaction #2 occu…
### Solid Remaining: Na: 1.79 g C: 0.933 g ### Total mass of solid produced: 2.72 g
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11. recall that there are 0.0777 moles $\text{nahco}_3$ reacting. calcu…
0.0777 mol C
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10. recall that there are 0.0777 moles $\\text{nahco}_3$ reacting in th…
0.0777 mol
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a lizard egg needs a temperature of 26-30°c to hatch properly. you plac…
D. Calcium chloride because it will create an exothermic reaction.
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9. next, predict the mass of the solid that would remain if reaction #2…
The coefficients (from left to right) are 2, 2, 1, 2, 3. The solid products are $\text{Na}(s)$ and $\text{C}(s)$; their total molar mass per 2 moles of $\text{NaHCO}_3$ is $(2\tim…
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chemistry unit 3 – quiz 1 practice 13. (5 pts) calculate the percent ab…
Percent abundance of Lutetium-175: \(97.40\%\) Percent abundance of Lutetium-176: \(2.60\%\)
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8. you calculated that 0.0777 moles naoh will remain if reaction #1 occ…
$3.108\ \text{g}$
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7 a cook had a jar containing a sweet food and a jar containing a sour …
A. The sweet food changed because the molecules were able to move fast enough to overcome the attraction between them. Its molecules now move away from each other.
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6 scientists digging in a cave found an unknown substance. the scientis…
a. into the substance, and the substance changed into a gas.
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5. a scientist has a container with a substance inside. at first, the m…
b. Before, the substance was a gas. Later, it was a liquid.
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7. use the equation built in the previous problem. calculate how many m…
0.0777 moles
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3. divers found two substances at the bottom of the ocean. at room temp…
a. weaker attraction between its molecules than Substance 2. Its molecules now move in place.
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6. construct the mole ratio needed to calculate how many moles of naoh …
Filled conversion: $0.0777\ \text{mol NaHCO}_3 \times \frac{1\ \text{mol NaOH}}{1\ \text{mol NaHCO}_3} = 0.0777\ \text{mol NaOH}$ Final moles of NaOH: $0.0777$
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9. classify the following changes as physical or chemical. a. boiling b…
a. Boiling: Physical change b. Crumpling: Physical change c. Burning: Chemical change d. Freezing: Physical change e. Evaporating: Physical change f. Rotting: Chemical change g. R…
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5. you can now convert the student response moles $ce{nahco_{3}}$ to mo…
$\text{NaHCO}_3(s) ightarrow \text{NaOH}(s) + \text{CO}_2(g)$ The coefficients are: 1, 1, 1
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4. you measured the mass of the baking soda ($nahco_3$) to be 6.53 gram…
$0.0777$ moles (rounded to three significant figures)
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heres the dimensional analysis setup from the previous problem: $14.3 \…
7.15 moles of $\text{O}_2$