J.R. S.

Chemistry

03/31/21

Based upon the solubility rules which of the following combinations of metal ions could be separated by addition of Cl- ions to a solution which is ~0.10 M in each metal ion

select one or more:a. Al3+ and Sc3+b. Ca2+ and Pb2+c. Mg2+ and Sr2+d. K+ and Ag+

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Science Chemistry Nursing

03/31/21

At the point in a titration where 5.00 mL of 0.225 mol/L hydrochloric acid, HCl(aq), is added to 40.00 mL of 0.175 mol/L potassium hydroxide, KOH(aq), what is the pH of the solution?

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Chemistry

03/31/21

Which of the following set of quantum numbers are NOT allowed?

Choose one or more:a. n =1 , ℓ =1 , mℓ =-1 and ms =-1/2 b. n =2 , ℓ =0 , mℓ =0 and ms =+1/2 c. n =6 , ℓ =3 , mℓ =-2 and ms =-1/2 d. n =2 , ℓ =1 , mℓ =2 and ms =-1/2

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Chemistry

03/31/21

2. Calculate Ka for NH4+ ion using Kb for NH3 (1.8 x 10-5). Compare this value with the one calculated from your measured pH value (higher, lower, or the same).

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Chemistry

03/31/21

Homework Question

a) Determine the Rate Law for the reaction of NO with O2 using the experimental data below. Remember that experimental values are never perfect. Use your best judgement to determine the order of... more

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Chemistry

03/31/21

I need help with this homework question

1. Rate of Reaction:For the reaction A→ B: Time (sec) [A] in mol/L 0.0 2.253.0 0.956.0 0.529.0 0.3812.0 0.2715.0 0.18a)... more

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Chemistry Acid Base titrations

03/30/21

Consider the titration of a 40.0 mL of 0.229 M weak acid HA (Ka = 2.7 x 10⁻⁸) with 0.100 M LiOH.

What is the pH of the solution before any base has been added? What would be the pH of the solution after the addition of 20.0 mL of LiOH? How many mL of the LiOH would be required to reach the... more

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Chemistry

03/30/21

At 560 K, ∆G° = -30.7 kJ/mol for the reaction A (g) + 2 B (g) → 3 C (g).

If the partial pressures of A, B, and C are 0.420 atm, 0.110 atm, and 7.20 atm respectively, what is the free energy for this reaction?

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Chemistry

03/30/21

For the reaction A (g) → 2 B (g), K = 14.7 at 298 K. What is the value of Q for this reaction at 298 K when ∆G = -15.9 kJ/mol?

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Chemistry

03/30/21

What is ∆G° for the reaction CH₃OH(g) → CO(g) + 2 H₂(g) at 25°C?

H = +90.7 kJ/molS = +221 J/mol K

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Chemistry

03/30/21

Determine the temperature of a reaction if K = 1.2 x 10⁻⁶ when ∆G° = +28.3 kJ/mol.

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Chemistry

03/30/21

At what temperature, in °C, is a certain reaction at equilibrium if ∆H = +88.0 kJ/mol and ∆S = +170.2 J/mol ･ K?

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Chemistry

03/30/21

Read the description

Values of the rate constant for the decomposition of N2O5 at four different temperatures are as follows:T (K): k (M-1s-1):658 2.14 x 105673 3.23 x 105688 703 x... more

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Chemistry

03/30/21

Read Description

The rate of constant for the reaction Br(g) + O3(g) —> BrO(g) + O2(g) was determined at the four temperatures shown below. T (K): k[cm3/molecules•s):238 5.90 x 10-13258 7.70 x 10-13278... more

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Chemistry

03/30/21

Chemistry QUestion

The combustion of pentane C5H12 produced 6.57 moles of water. How many moles of Oxygen was necessary to make this reaction take place?

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Chemistry

03/30/21

Which has the strongest Intramolecular attractive forces?

Metallic, Ionic and Covalent bond.In High School Chemistry, most text books only describe the differences between them.I have seen many sources online, there are a mix of opinions on ranking the... more

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Chemistry

03/30/21

22-1 CHEMISTRY HELP PLS

How many liters of hydrogen gas at STP can be generated from the reaction of excess hydrogen chloride with 79.7 g of aluminum?

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Chemistry

03/30/21

21-3 CHEMISTRY HELP PLEASE

The following chemical equation has NOT been balanced. H3PO4 + Ca(OH)2 --> Ca3(PO4)2 + H2O How many grams of calcium hydroxide are needed to produce 17.94 grams of water?Answer value

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Chemistry

03/30/21

homework question

At a certain temperature,the kp for the decomposition of H2S is 0.893H2S(g)↽−−⇀H2(g)+S(g)Initially, only H2S is present at a pressure of 0.146 atm in a closed container. What is the total pressure... more

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Chemistry

03/29/21

ΔH0solution, of sodium nitrate (NaNO3) is 20.50 kJ/mol solute. Calculate quantity of heat that is absorbed if 50g sodium nitrate dissolves in 200g water. What is the change temperature of the water

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Science Chemistry Physical Science

03/29/21

What is the rate equation given this data table?

A chemist does a reaction rate analysis on the following reaction:2NO (g) + O2 (g) → 2NO2 (g)She collects the following data:Trial Initial [NO] (M) Initial [O2] (M) Instantaneous Rxn Rate (M/s)1 ... more

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Chemistry

03/29/21

Determine the rate law, including the values of the orders and rate law constant, for the following reaction using the experimental data provided.

X+Y yields products Trial 1- X:0.20 M Y:0.15M Rate:2.4x10^-2 M/min Trial 2- X:0.20M Y:0.30M Rate:4.8x10^-2 M/min Trial 3- X:0.40M Y:0.30M Rate:19.2x10^-2 M/min

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Chemistry

03/29/21

Assuming that CoCl2 dissociates completely into ions when it dissolves.

With steps plzAssuming that CoCl2 dissociates completely into ions when it dissolves.Find the freezing point of a solution that is made by dissolving 130 grams of CoCl2, in 1000 grams of... more

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Chemistry

03/29/21

.........g CH4O -WITH STEPS PLEASE-

Find how many grams of (nonelectrolyte) CH4O would have to be added to 1000 g of H2O to produce a solution with a freezing point of -3.65 °C?.........g CH4O

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Chemistry

03/29/21

Which of the following ionic compounds will yield a solution with a pH < 7 when added to water?

KOHLiBrNaFNaCNNH4Cl

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Answers •1

Based upon the solubility rules which of the following combinations of metal ions could be separated by addition of Cl- ions to a solution which is ~0.10 M in each metal ion

At the point in a titration where 5.00 mL of 0.225 mol/L hydrochloric acid, HCl(aq), is added to 40.00 mL of 0.175 mol/L potassium hydroxide, KOH(aq), what is the pH of the solution?

Which of the following set of quantum numbers are NOT allowed?

2. Calculate Ka for NH4+ ion using Kb for NH3 (1.8 x 10-5). Compare this value with the one calculated from your measured pH value (higher, lower, or the same).

Homework Question

I need help with this homework question

Consider the titration of a 40.0 mL of 0.229 M weak acid HA (Ka = 2.7 x 10⁻⁸) with 0.100 M LiOH.

At 560 K, ∆G° = -30.7 kJ/mol for the reaction A (g) + 2 B (g) → 3 C (g).

For the reaction A (g) → 2 B (g), K = 14.7 at 298 K. What is the value of Q for this reaction at 298 K when ∆G = -15.9 kJ/mol?

What is ∆G° for the reaction CH₃OH(g) → CO(g) + 2 H₂(g) at 25°C?

Determine the temperature of a reaction if K = 1.2 x 10⁻⁶ when ∆G° = +28.3 kJ/mol.

At what temperature, in °C, is a certain reaction at equilibrium if ∆H = +88.0 kJ/mol and ∆S = +170.2 J/mol ･ K?

Read the description

Read Description

Chemistry QUestion

Which has the strongest Intramolecular attractive forces?

22-1 CHEMISTRY HELP PLS

21-3 CHEMISTRY HELP PLEASE

homework question

ΔH0solution, of sodium nitrate (NaNO3) is 20.50 kJ/mol solute. Calculate quantity of heat that is absorbed if 50g sodium nitrate dissolves in 200g water. What is the change temperature of the water

What is the rate equation given this data table?

Determine the rate law, including the values of the orders and rate law constant, for the following reaction using the experimental data provided.

Assuming that CoCl2 dissociates completely into ions when it dissolves.

.........g CH4O -WITH STEPS PLEASE-

Which of the following ionic compounds will yield a solution with a pH < 7 when added to water?

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