08/04/20

(1) The element with an electron configuration of 1s22s22p63s23p64s23d6 is in group ? and ? period .
(2) The element with an electron configuration of 1s22s22p1 is in group ? and ? period  .
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08/03/20

A local FM radio station broadcasts at an energy of 6.24×10-29 kJ/photon. Calculate the frequency at which it is broadcasting. Frequency = MHz (1 MHz = 106 sec -1)

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08/03/20

(1) The element with a valence electron configuration of 3s23p2 is in group and period (2) The element with a valence electron configuration of 4s24p1 is in group and period .
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08/03/20

Energy of a photon

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08/01/20

need help to solve
For the cell shown, the measured cell potential, 𝐸 cell is 0.3629 V at 25 °cPt(s) | H2(g,0.707 atm) | H+(aq,? M) || Cd2+(aq,1.00 M) | Cd(s)The balanced reduction half-reactions for the cell, and... more
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07/30/20

Calculate the change in the internal energy of the engine.
An automobile engine provides 528 Joules of work to push the pistons and generates 2122 Joules of heat that must be carried away by the cooling system.Calculate the change in the internal energy of... more
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07/29/20

Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of CO(g) is ?? kJ/mol.
A scientist measures the standard enthalpy change for the following reaction to be 201.6 kJ:CH4(g) + H2O(g)3H2(g) + CO(g)
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07/29/20

The standard enthalpy change for the following reaction is -200 kJ at 298 K.
The standard enthalpy change for the following reaction is -200 kJ at 298 K. 2 Ag(s) + Br2(l)  2 AgBr(s)    ΔH° = -200 kJ What is the standard enthalpy change for this reaction at 298... more
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07/28/20

Use the SMALLEST INTEGER coefficients possible and put the energy term (including the units) in the last box on the appropriate side of the equation. If a box is not needed, leave it blank.
When I2(g) reacts with Cl2(g) to form ICl(g) , 26.8 kJ of energy are evolved for each mole of I2(g) that reacts.Write a balanced thermochemical equation for the reaction with an energy term in kJ... more
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07/28/20

Answer: ??? °C.
A sample of solid iodine is heated with an electrical coil. If 57.6 Joules of energy are added to a 10.8 gram sample initially at 23.3°C, what is the final temperature of the iodine?
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07/28/20

Given the standard enthalpy changes for the following two reactions:
Given the standard enthalpy changes for the following two reactions:(1) N2(g) + 2O2(g)2NO2(g)...... ΔH° = 66.4 kJ(2) 2N2O(g)2N2(g) + O2(g)......ΔH° = -164.2 kJwhat is the standard enthalpy change... more
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07/28/20

CH4(g) + H2O(g)3H2(g) + CO(g)
A scientist measures the standard enthalpy change for the following reaction to be 201.6 kJ:CH4(g) + H2O(g)3H2(g) + CO(g)Based on this value and the standard enthalpies of formation for the other... more
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07/26/20

Coffee virtual Lab
I got the question from this virtual lab http://chemcollective.org/activities/autograded/115 but I dont understand how to get the answer.  An eccentric chemistry professor (not mentioning any... more
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07/26/20

When a solid dissolves in water, heat may be evolved or absorbed. The heat of dissolution (dissolving) can be determined using a coffee cup calorimeter.
In the laboratory a general chemistry student finds that when 8.01 g of CsBr(s) are dissolved in 111.10 g of water, the temperature of the solution drops from 24.31 to 21.97 °C.The heat capacity of... more
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07/26/20

What is the energy change when the temperature of 14.5 grams of solid tin is decreased from 39.8 °C to 24.7 °C ?
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07/26/20

The stopcock connecting a 2.64 L bulb containing helium gas at a pressure of 6.06 atm,
The stopcock connecting a 2.64 L bulb containing helium gas at a pressure of 6.06 atm, and a 7.11 L bulb containing methane gas at a pressure of 2.96 atm, is opened and the gases are allowed to... more
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07/25/20

A mixture of neon and argon gases is maintained in a 7.81 L flask at a pressure of 2.97 atm

A mixture of neon and argon gases is maintained in a 7.81 L flask at a pressure of 2.97 atm and a temperature of 68 °C. If the gas mixture contains 9.75 grams of neon, the number of grams... more
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07/25/20

Enter formulas and temperatures in the boxes below: 1 = slowest, 4 = fastest
Arrange the following molecules in order of increasing average molecular speed.Ne at 390K, Ar at 315K, NH3 at 390K, NH3 at 440K
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07/25/20

Write the balanced net ionic equation for the precipitation of magnesium hydroxide from aqueous solution:
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07/25/20

Write the balanced net ionic equation for the precipitation of iron(III) phosphate from aqueous solution:
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07/25/20

An iron nail rusts when exposed to oxygen.

 How many grams of iron are needed to completely consume 14.5 L of oxygen gas according to the following reaction at 25 °C and 1 atm?iron ( s ) + oxygen ( g )  iron(III) oxide ( s )??grams iron
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07/24/20

At 1 atm, how much energy is required to heat 81.0 g H2O(s) at −12.0 ∘C to H2O(g) at 125.0 ∘C? Use the heat transfer constants found in this table.
 Quantity  per gram    Enthalpy of fusion  333.6 J/g  6010. J/mol  Enthalpy of vaporization  2257 J/g  40660 J/mol  Specific heat of solid H2O (ice)   2.087 J/(g·°C) *   37.60 J/(mol·°C)... more
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07/24/20

Homework question

50.0 ml of 10.0 M sodium hydroxide is added to a 1.00 L solution containing 0.100M nickel (III) nitrate, 0.100M tin (II) nitrate, and 0.100M zinc nitrate. How many grams of tin (II) hydroxide... more
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07/24/20

Chemistry Buffer pH question
A buffer that contains 0.124 M acid, HY, and 0.222 M of its conjugate base, Y−, has a pH of 8.72. What is the pH after 0.0016 mol of Ba(OH)2 is added to 0.340 L of this solution?
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07/23/20

Write the balanced net ionic equation for the precipitation of aluminum sulfide from aqueous solution:
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