03/29/21

Given a 1.0 L solution containing 0.1 moles NaNO2 and 0.1 moles HNO2, what is the net ionic equation upon the addition of a small amount of KOH?
H+ + H2O → H3O+ OH- + NO2- → HNO3 OH- + HNO2 → H2O + NO2- H+ + NO2- → HNO2 OH- + H2O → H3O2-
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03/29/21

Which of the following compounds is more soluble in a 0.1 M HCl solution than in pure water?
MgF2 AgI SrSO4 Ba(NO3)2
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03/29/21

Which one of these statements is true for a 0.1 M solution of a weak acid (HA)?

[OH-] > [H+] pH = 1.0 [H+] > [A-] [H+] < [A-]  pH > 1.0
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03/29/21

Please Read the Description

Cyclopentadiene (C5H6) reacts with itself to form dicyclopentadiene (C10H12). A 0.880 M solution of C5H6 is monitored as a function of time as the reaction proceeds. A graph of In[C5H6] versus time... more
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03/29/21

Read the Description

Hydrogen gas reduces NO to N2 in the following reaction:2H2(g) + 2NO(g) <—> 2H2O(g) + N2(g) The initial reaction rates of four mixtures of H2 and NO were measured at 1500°C with the following... more
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03/29/21

Determine unknown volume 
Calculate the volume of 6.93x10^-2 M calcium hydroxide required to neutralize 28.2 mL of a 0.147 M hydrochloride acid solution.
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03/29/21

Use Use primary standard to determine unknown concentration 
Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in the laboratory as a primary standard. It has the unwieldy formula of KHC8H4O4. This is often written in shorthand... more
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03/29/21

Can someone please check-over my answers to these Chemistry questions? (My answer is in bold)
*The VSEPR theory is based on the property that ____.A. the like charges of electrons repel each otherB. the like charges of the protons in the nuclei repel each otherC. electrons are shared... more
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03/28/21

chemistry homework question

consider the mechanismStep 1: A --> B+C equilibriumStep 2: C + D---> E slowOverall: A+D--> B+E Determine the rate law for the overall reaction, where the overall rate constant is... more
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03/28/21

homework question
Phosphorus pentachloride decomposes according to the chemical equationPCl5(g)↽−−⇀PCl3(g)+Cl2(g) 𝐾c=1.80 at 250 ∘CA 0.4186 mol sample of PCl5 (g) is injected into an empty 4.25Lreaction... more
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03/28/21

chemistry question
Consider the reaction.2A(g)↽−−⇀B(g) 𝐾p=6.75×10−5 at 500 KIf a sample of A(g) at 2.00atm is heated to 500 K, what is the pressure of B(g) at equilibrium?  Can someone show me the steps... more
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03/28/21

According to the following reaction, how much energy is required to decompose

According to the following reaction, how much energy is required to decompose 4.8 kg of Fe 3O 4? The molar mass of Fe 3O 4 is 231.55 g/mol. Fe 3O 4(s) → 3 Fe(s) + 2 O 2(g) ΔH° rxn = +1118 kJ 
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03/28/21

to determine the value of the final temperature of the calorimeter
A 6.4g sample of aniline (C 6H 5NH 2, molar mass = 93.13 g/mol) was combusted in a bomb calorimeter with a heat capacity of 14.25 kJ/°C. If the initial temperature was 32.9°C, use the information... more
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03/28/21

In Lewis Structures, what is 𝛿 (delta) used in conjunction with?
A. electrical charges of non-polar covalent bondsB. electrical charges of polar covalent bondsC. electrical charges of ionic bondsD. electrical charges of metallic bondsE. electrical charges of... more
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03/28/21

Can someone please check-over my answers to these questions? (My answer will be in bold)
*According to the VSEPR theory, a molecule or ion of SiCl2O will have a ___ shape.A. flat linearB. flat trigonalC. bentD. pyramidalE. None of the above*According to the VSEPR theory, a molecule or... more
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03/28/21

Chemical or physical change?
Why is the dissolving of aluminum nitrate in water considered both a physical and chemical process?
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03/28/21

Functional Group

Find all of the functional groups present in Benzoic acid.
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03/27/21

When 3.87 g of a nonelectrolyte solute is dissolved in water to make 235 mL of solution at 28 °C, the solution exerts an osmotic pressure of 857 torr.
What is the molar concentration of the solution?How many moles of solute are in the solution?What is the molar mass of the solute?
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03/27/21

chemistry question
consider the mechanism :Step 1: 2A⟶B+C slow Step 2: B+C⟶E fast Overall: 2A⟶EDetermine the rate law for the overall reaction, where the overall rate... more
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03/27/21

271. mL of a 21% v/v solution of ethanol,C2H6O , in water
271. mL of a 21% v/v solution of ethanol,C2H6O , in water>what is the ...........mL of C2H6Owhat is the .......... mL of water
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03/27/21

What is this concentration in ppm?

(Assume that the density of the solution is 1.00 g/mL.)What is this concentration in ppm for a solution of As2O3 that has a molarity of 6×10-7 M.
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03/27/21

Grams and heat... How to calculate?
How do you calculate the grams of a compound that would be required to produce a specific amount of heat?
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03/27/21

Calculate the ΔH for the reaction: 2 Al (s) + 3 Cl2 (g) --> 2AlCl3 (s) from the following data.
1) 2 Al (s) + 6 HCl (aq) --> 2 AlCl3 (aq) + 3 H2 (g) ΔH= -1049 kJ2) HCl (g) --> HCl (aq) ΔH= -74.8 kJ/Mole3) H2 (g) + Cl2 (g) --> 2 HCl (g) ΔH= -1845 kJ4) AlCl3 (s) --> AlCl3 (aq) ... more
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03/27/21

Calculate the ΔH for the reaction 4 NH3 (g) + 5 O2 (g) --> 4 NO (g) + 6 H20 (g), from the following data.

1) N2 (g) + O2 (g) --> 2 NO (g) ΔH= -180.5 kJ 2) N2 (g) + 3 H2 (g) --> 2 NH3 (g) ΔH= -91.8 kJ 3) 2 H2 (g) + O2 (g) --> 2 H2O (g) ΔH= -483.6 kJ
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03/27/21

Titration question
Buret initial volume barium hydroxide: 45.37mLBuret final volume barium hydroxide: 28.20mLThe concentration of Ba(OH)2: 1.4 MThe volume of HNO3: 25.0mLThe concentration of HNO3; ?I have 2 questions... more
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