化学
化学反応、化学量論、分子構造、元素の性質。
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using the thermodynamic information in the aleks data tab, calculate th…
372
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using the thermodynamic information in the aleks data tab, calculate th…
180
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using the thermodynamic information in the aleks data tab, calculate th…
-457
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using the thermodynamic information in the aleks data tab, calculate th…
-2108
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using the thermodynamic information in the aleks data tab, calculate th…
-801
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using the thermodynamic information in the aleks data tab, calculate th…
-86
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what is the final volume of the diluted solution when 25.0 ml of 5.0 m …
62.5
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how many grams of hno3 are needed to make 700.0 ml of a 5.0 m solution?…
220.5 (or 221, or 220) g (more precisely, 220.535 g, so \boxed{221} or \boxed{220.5} depending on rounding, but let's do the exact calculation: 5.0 * 0.7000 = 3.5; 3.5 * 63.01 = 2…
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how many grams of hcl are needed to make 200.0 ml of a 3.0 m solution? …
21.9 (or 22, depending on significant figures; the precise calculation gives 21.876, which can be rounded to 21.9 or 22)
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how many grams of kmno₄ are needed to make 0.500 l of 1.0 m kmno₄ solut…
$79.0\ g$ (or $79\ g$ or $79.015\ g$ depending on significant figures, here with three significant figures from $0.500\ L$ and $1.0\ M$, it's $79.0\ g$)
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we wish to determine the mass of baso₄ formed when 200. ml of 0.10 m ba…
The mass of \( \text{BaSO}_4 \) formed is \( \boldsymbol{4.67 \, \text{g}} \) (or \( 4.7 \, \text{g} \), depending on significant figures; precise calculation gives \( 0.020 \time…
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we wish to determine the mass of baso₄ formed when 200. ml of 0.10 m ba…
The number of moles of $\ce{BaCl_{2}}$ is $\boldsymbol{0.020\space mol}$ (or 0.02 mol, depending on significant figures; 200. mL has three, 0.10 M has two, so two significant figu…
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we wish to determine how many grams of al(no₃)₃ can form when 200.0 ml …
\( 42.6 \, \text{g} \) (or 42.602 g, depending on precision)
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we wish to determine how many grams of al(no₃)₃ can form when 200.0 ml …
The number of moles of \(Al_2(SO_4)_3\) is \(0.100\space mol\).
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what is the volume of a 0.40 m nai solution that contains 0.20 moles na…
\( 0.50 \) L
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what is the molar concentration of a solution that contains 7.0 mol nac…
$3.5$
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what is the molar concentration of a solution that contains 5.0 mol hcl…
$0.50$
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how many ml of formic acid would you add to water to make 755 ml of a 2…
\(189\space mL\) (or \(188.75\space mL\) depending on significant figures, here 25.0 has three, 755 has three, so the answer can be \(189\space mL\) or \(188.75\space mL\))
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what happens to the freezing point of a solvent when a solute is added …
The freezing point decreases.
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each solute is dissolved in 1 l of solvent. which solution will exhibit…
1.0 mole $\ce{CaBr2}$ (dissociates into 3 particles)
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what happens to the boiling point of a solvent when a solute is added t…
B. The boiling point increases.
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each solute is dissolved in 1 l of solvent. which solution will exhibit…
0.5 moles AlN (dissociates into 2 particles)
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each solute is dissolved in 1 l of solvent. which solution will exhibit…
4.0 moles \( \text{CH}_2\text{O} \) (dissociates into 1 particle)
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what do colligative properties depend on? the type of dissolved particl…
The number of dissolved particles.
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what volume of a 3.95 m potassium chloride solution would be needed to …
\( \approx 227 \) (or more precisely \( 227.09 \)) mL
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what is the final volume of the diluted solution when 25.0 ml of 5.0 m …
\( 62.5 \)
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what volume of a 1.25 m potassium fluoride (kf) solution would be neede…
\( 305 \) (rounded to a reasonable number of significant figures, or \( 305.03 \) if more precision is needed)
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what is the final concentration of 500. ml of a solution made from 125.…
\( 0.75 \, M \)
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what is the final concentration of 1,500. ml of a solution made from 20…
\( 2.4 \)
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you want to determine the concentration when 93 ml of a 2.03 m kf solut…
4013 mL
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you want to determine the concentration when 93 ml of a 2.03 m kf solut…
\( \approx 0.0470 \, \text{M} \)
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you want to determine the concentration when 93 ml of a 2.03 m kf solut…
93 mL (corresponding to the option with "93 mL")
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you want to determine the concentration when 93 ml of a 2.03 m kf solut…
2.03 M
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how many ml of water should you add to the 60 ml of concentrated soluti…
90 mL
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what volume of a 2.5 m lithium nitrate solution would be needed to make…
60
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you want to determine the volume of 2.5 m lithium nitrate solution need…
1.0 M
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you want to determine the volume of 2.5 m lithium nitrate solution need…
\( 60 \, \text{mL} \)
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you want to determine the volume of 2.5 m lithium nitrate solution need…
\( 2.5 \, M \)
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what volume, in liters, of 0.023 m nh4no3 solution can be made using 25…
Approximately 13.6 L (or more precisely ~13.58 L)
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what volume, in liters, of 4.0 m libr solution can be made using 100.0 …
$\approx 0.289$
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what volume, in liters, of 2.0 m naoh solution can be made using 500.0 …
6.25
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how many grams of kmno4 are needed to make 0.500 l of 1.0 m kmno4 solut…
79.015 (or approximately 79.0)
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how many grams of hno₃ are needed to make 700.0 ml of a 5.0 m solution?…
220 g (or 220.5 g, but typically rounded to 220 g for two significant figures)
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what glassware should you use to make 250 ml of a 0.1 m hcl solution? 2…
B. 250 mL volumetric flask
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how many grams of potassium carbonate are needed to make 400.0 ml of 2.…
D. 140 g $\ce{K2CO3}$ (assuming the last option is D, with text "140 g $\ce{K2CO3}$")
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how many grams of potassium carbonate are needed to make 400.0 ml of 2.…
# Explanation: ## Step1: Recall Molarity Formula Molarity ($M$) is defined as moles of solute ($n$) per liter of solution ($V$ in liters), so $M=\frac{n}{V}$. We need to find mole…
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which piece of glassware is a volumetric flask?
The Right Graph (the glassware on the right)
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trevor has been asked to analyze the rhyme scheme in shakespeare’s “son…
C. abab
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in aqueous solution the ni²⁺ ion forms a complex with four cyanide anio…
For $K_f$: $\boldsymbol{K_f=\frac{[\ce{Ni(CN)_{4}}^{2 - }]}{[\ce{Ni^{2+}}][\ce{CN^-}]^4}}$ For the last step: $\boldsymbol{\ce{[Ni(CN)_{3}]^-(aq) + CN^-(aq) <=> [Ni(CN)_{4}]^{2-}(…
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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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reuben sold 300 liters of soda at a baseball game. how much is this in …
300000
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an element with mass 310 grams decays by 8.9% per minute. how much of t…
The remaining mass of the element after 19 minutes is approximately $\boxed{54.2}$ grams.
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46) in a chemical reaction, a catalyst is something that speeds up the …
For the first reaction: $\boldsymbol{\ce{V2O5}}$ For the second reaction: $\boldsymbol{\ce{H2SO4}}$
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one type of strontium has a radioactive decay rate of 1.4% per day. if …
24.85
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45) in the expression 3 no₂, which number is the coefficient and which …
Coefficient: \( 3 \); Subscript: \( 2 \)
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45) in the expression 3 no₂, which number is the coefficient and which …
Coefficient: 3; Subscript: 2
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question an element with mass 570 grams decays by 18% per minute. how m…
The remaining mass of the element is approximately $\boldsymbol{42.9}$ grams.
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use the following reaction to answer the next questions. h₂o₂(aq) → h₂o…
The \((l)\) next to \(H_2O\) stands for "liquid", indicating that \(H_2O\) is in the liquid state. ### Question 40:
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use the following reaction to answer the next questions. h₂o₂(aq) → h₂o…
liquid ### 40)
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in the questions below, put a checkmark next to the equations that viol…
- 31) $\boldsymbol{\times}$ (not unbalanced) - 32) $\boldsymbol{\checkmark}$ (unbalanced) - 33) $\boldsymbol{\times}$ (not unbalanced) - 34) $\boldsymbol{\times}$ (not unbalanced)…
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in aqueous solution the ni²⁺ ion forms a complex with four cyanide anio…
For the formation constant expression: \(K_f = \frac{[\ce{Ni(CN)_{4}^{2-}}]}{[\ce{Ni^{2+}}][\ce{CN^{-}}]^{4}}\) For the last step: \(\ce{[Ni(CN)_{3}]^{-}(aq) + CN^{-}(aq) <=> [Ni(…
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29) when balancing a chemical reaction, what are the small numbers that…
- **Question 42 (Reactants)**: \( \ce{H_{2}O(aq)} \) - **Question 43 (Products)**: \( \ce{H_{2}O(l)} \), \( \ce{O_{2}(g)} \) For question 39: The \((l)\) next to \( \ce{H_{2}O} \)…
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an element with mass 970 grams decays by 27.7% per minute. how much of …
\( 9.9 \) grams
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question 4 of 5 common household items that contain chemicals that are …
D. All of the above (assuming the options are labeled A - D with D as "All of the above"; if the last option is "All of the above" without a letter, state it as "All of the above")
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question 10 (1 point) listen solute1. na₂co₃ is in water. insoluble sol…
C. soluble and an electrolyte (assuming the options are labeled A: insoluble, B: soluble and a nonelectrolyte, C: soluble and an electrolyte; if labels differ, adjust to the optio…
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a can of soup has a volume of 12 fluid ounces. how many milliliters is …
\( 355.2 \)
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an element with mass 670 grams decays by 21.8% per minute. how much of …
\( 25.1 \) grams
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an element with mass 570 grams decays by 26.9% per minute. how much of …
13.9
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some bugs can walk on the surface of water because the attraction betwe…
cohesion
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enter the ions present in a solution of na₃po₄. express your answers as…
$\ce{Na+}$, $\ce{PO4^{3-}}$
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question 16 0.25 pts atomic mass is determined by the number of: - prot…
D. protons and neutrons. ### Question 17
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enter the ions present in a solution of na₃po₄. express your answers as…
$\ce{Na+}$, $\ce{PO4^{3-}}$
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drag the appropriate items to their respective bins. view available hin…
Soluble: \( \text{Na}_3\text{PO}_4 \) Insoluble: \( \text{Cu}_3(\text{PO}_4)_2 \), \( \text{PbSO}_4 \), \( \text{PbCl}_2 \)
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6.0 g ti, 6.0 g f₂ express your answer using two significant figures. m…
$\boxed{10.}$ (or $\boxed{9.8}$ depending on rounding, but 10. with two significant figures is appropriate here)
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oduct (in amounts of part b 2.2 g ti, 1.8 g f₂ express your answer usin…
\( \boxed{2.9} \)
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al(s) + feso₄(aq) → al₂(so₄)₃(aq) + fe(s) express your answers as integ…
2,3,1,3
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k₂so₃(aq) + mncl₂(aq) → mnso₃(s) + kcl(aq) express your answers as inte…
1,1,1,2 ### Part B
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predict the product for the following reactions. rxn i 1. naoet 2. h₂o …
B. (For Rxn I: the product has $OH$ (wedge) and $OEt$ (dash); For Rxn II: the product has $OCH_3$ (wedge) and $OH$ (dash))
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predict the product for the following reactions. rxn i rxn ii rxn i rxn…
C. $\boldsymbol{\ce{HO - C(CH3)-CH2 - OH}}$ (for Rxn I) and $\boldsymbol{\ce{HO - C(CH3)-CH2 - OCH3}}$ (for Rxn II) (the structures as shown in option C)
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based on conditions, identify where a nucleophilic attack would occur o…
C. II and III
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based on conditions, identify where a nucleophilic attack would occur o…
C. II and III
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question 1 predict the major product for each. consider regio and stere…
B. For Rxn I: $\ce{CH3CH2 - CH(OH)-CH(OH)-CH2CH3}$ (with anti - stereochemistry of - OH groups) + En; For Rxn II: $\ce{CH3CH2 - CH(OH)-CH(OH)-CH2CH3}$ (with anti - stereochemistry…
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the elemental mass percent composition of succinic acid is 40.68% c, 5.…
$\ce{C2H3O2}$ (Wait, actually, let's recheck. Wait, when we multiply by 2: C: 1×2=2, H:1.5×2=3, O:1×2=2? Wait no, wait the moles of H was ~5.08? Wait no, wait my calculation for H…
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missed this? watch iwe: obtaining an empirical formula from experimenta…
6, 8, 7
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the elemental mass percent composition of succinic acid is 40.68% c, 5.…
$\ce{C2H3O2}$ (Wait, correction: Wait, when we did H: 5.08/3.387 ≈ 1.5, multiplying by 2 gives 3. But let's recalculate moles more accurately. Re - calculating moles: C: 40.68 / 1…
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explain: parts of an elemental square drag the correct item to label th…
- The box with "14" is labeled by "Atomic Number". - The box with "Si" (the symbol) is labeled by "Symbol". - The box with "28.086" is labeled by "Atomic Mass". - The box with "Si…
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which of the following is considered an electrolyte? ○ a. prednisone ○ …
d. phosphorus
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question 4 suppose lashonda wants to find out about hydrogen sulfide. s…
B. in a book about common gases
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multiple select question select all that apply choose all that are char…
A. Temporary weakness, B. Temporary dizziness, D. Temporary paralysis, E. Headache, F. Temporary loss of vision
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protons, neutrons, and electrons, based on the given atomic mass. remem…
The table is filled as shown above, with each element's symbol, group number, protons, neutrons (calculated as mass - protons), electrons (equal to protons), and mass number.
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multiple choice question which condition is caused by a sudden death of…
D. Stroke (assuming the options are labeled A to D with D being Stroke; if the original options have different labels, adjust accordingly. Here, the correct option is the one with…
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multiple choice question brief episodes of cerebral ischemia produce wh…
C. Transient ischemic attacks (TIAs)
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multiple choice question a transient ischemic attack (tia) is often a w…
A. stroke
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question 10 what is the shape of the species shown in the lewis structu…
A. bent
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question 9 what is the shape of the species shown in the lewis structur…
bent
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click on the best lewis structure for xef₃⁺? diagrams of four lewis str…
The Top - Left Lewis Structure (the first structure with three F atoms each having six lone pair electrons and Xe with two lone pair electrons, all in brackets with a + charge)
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multiple choice question a general insufficient blood flow to a tissue …
C. ischemia (assuming the options are labeled as A. hypoxia, B. necrosis, C. ischemia; if labels differ, adjust to the correct identifier with "ischemia").
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multiple choice question a thrombosis can cause which of the following?…
C. Ischemia
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multiple choice question vasoactive chemicals are substances that stimu…
E. Vasomotion
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drag the tiles to the correct boxes to complete the pairs. identify the…
- Michael uses a car that burns fossil fuels: combustion reaction - Alan grows tomatoes on his farm: photosynthesis - Lisa eats eggs for breakfast: respiration