12/03/20

A Lewis structure with placeholder elements is shown below. If the formal charge of the central atom is 0, choose the possible identity or identities of the central atom.
A Lewis structure with placeholder elements is shown below. If the formal charge of the central atom is 0, choose the possible identity or identities of the central... more
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12/03/20

What is the mass percent of sodium carbonate, %(m/m) Na2CO3, in a solution prepared by dissolving 4.28 grams of sodium carbonate in 35.11 grams of water.

What is the mass percent of sodium carbonate, %(m/m) Na2CO3, in a solution prepared by dissolving 4.28 grams of sodium carbonate in 35.11 grams of water. 
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12/03/20

The first-order reaction, 2 N2O(g) → 2 N2(g) + O2(g), has a rate constant equal to 0.76 s-1at 1000 K.

How long will it take for the concentration of N2O to decrease to 42% of its initial concentration?
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12/03/20

Physiological saline solution is isotonic with which of the following?

Physiological saline solution is isotonic with which of the following? Choose ALL that apply.distilled water0.92% (m/v) sodium chloride5.0% (m/v) sodium chloride0.92% (m/v) glucosered blood cell... more
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12/03/20

standard Enthalpy of formation

how do i find the standard enthalpy of formation of glucoamylase? How do i estimate it
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12/02/20

Gas Collected Over Water
Consider the reaction of a piece of zinc reacting with hydrochloric acid. The gas is collected above water based on the data below. a. Write the reaction occurring.    Zn(s) + 2HCl(aq) ---->... more
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12/02/20

calculating energy needed to raise temperature of water

calculate the energy (in kj) required to raise the temperature of 0.832 grams of water from -15.75 degree celsius to 21.84 degree celsuis. the answer choices were:0.02742.631040.3810.305when i did... more
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12/02/20

Determine order of reaction. Thank you!
Use the data below to determine the order of the reaction based on the first two half-life cycles. Time (s) [X] (M) 0 10.00 100 7.45 180 5.00 220 4.10 360 2.50 410 1.85
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12/02/20

Calculate the amount in moles
Calculate the amount in moles: 2.01 x 10^23 atoms of Rubidium a. 1.2 molb. None of the abovec. 3.11 mold. 0.5 mole. 1 mol
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12/02/20

Make Lewis Dot Structures for common ions:
a. H1+ b. Li1+c. Cl1- d. O2-
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12/02/20

A bond forms between hydrogen and bromine. Will it be ionic, polar covalent, or nonpolar covalent? How do you determine this?
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12/02/20

How do you know if a covalent bond has formed?
I understand how a covalent is formed, but I don't know how do I know when a covalent bond is formed.
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12/02/20

Which structures below are plausible resonance contributors for NCNH⁻? Assume the connectivity is as written.
Which structures below are plausible resonance contributors for NCNH⁻? Assume the connectivity is as written.https://content.101edu.co/static/images/resonance_ncnh.png
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12/02/20

Calculate the pH of each of the following solutions:
a. [H3O+ ] = 2.0 x 10^-12 M b. [OH- ] = 4.5 x 10^-3 Mc. 3.5 M HCl d. 5.25 M NaOH
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12/02/20

A solution of 0.220 MM NaOHNaOH is used to titrate 47.0 mLmL of a 0.0324 MM H3PO4H3PO4 solution. What volume, in milliliters, of the NaOHNaOH solution is required?
H3PO4(aq)+3NaOH(aq)→3H2O(l)+Na3PO4(aq)
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12/02/20

Calculate the pH of a 0.25 M NaOH solution. Note: Kw = [OH-] x [H3O+] = 1.0 × 10–14, pH = -log[H3O+]

Calculate the pH of a 0.25 M NaOH solution. Note: Kw = [OH-] x [H3O+] = 1.0 × 10–14, pH = -log[H3O+]
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12/02/20

Find the [H3O+] of a solution with a pH of 4.25. [H3O+] = 10-pH

Find the [H3O+] of a solution with a pH of 4.25. [H3O+] = 10-pH
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12/02/20

A weak base has an [OH-] = 3.7 x 10-5 M. Calculate the [H3O+]. Note: Kw = [OH-] x [H3O+] = 1.0 × 10–14

A weak base has an [OH-] = 3.7 x 10-5 M. Calculate the [H3O+]. Note: Kw = [OH-] x [H3O+] = 1.0 × 10–14
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12/02/20

Calculate the acid dissociation constant (Ka) of hydrofluoric acid if the following concentrations were found at equilibrium: [H3O+] = [F-] = 7.8 x 10-3 M, [HF] = 0.0922.

HF (aq) + H2O (l) F-(aq) + H3O+(aq)  
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12/02/20

1. Write the conjugate acid for each of the following base

a) NH3 ____________________ b) NO3- ____________________ c) H2O ____________________
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12/02/20

Determine the number of nonbonding electron pairs on the central atom of NOCl (lewis structure)
Determine the number of nonbonding electron pairs on the central atom of NOCl (lewis structure) A)0B)1C)2D)4E)6
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12/02/20

Chemistry homework
If a solution containing 107.34 g of mercury(II) nitrate is allowed to react completely with a solution containing 15.488 g of sodium sulfide, how many grams of solid precipitate will form?How many... more
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12/02/20

Chemistry homework
The quantity of atmospheric SO2(g) can be determined by reaction with H2O2(aq) according to the balanced chemical equation shown.H2O2(aq)+SO2(g)⟶H2SO4(aq)The amount of sulfuric acid produced can be... more
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12/02/20

Electrolysis of molten NaCl in a Downs cell is the major isolation step in the production of sodium metal. Assuming that 211 g of Na metal forms, answer the following questions.
Electrolysis of molten NaCl in a Downs cell is the major isolation step in the production of sodium metal. Assuming that 211 g of Na metal forms, answer the following questions.  9.17 = mol... more
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12/02/20

What are E^0 cell and ΔG^0 of a redox reaction at 25°C for which n = 1 and K = 6.5 ×10^4?
Be sure to answer all parts.What are E^0 cell and ΔG^0 of a redox reaction at 25°C for which n = 1 and K = 6.5 ×104?ΔG^0 = _____ JE^0 cell = _____ VPlease answer in regular form. thank you.
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