11/29/20

Can anyone help me with this question
The value of ∆Hsoln for the formation of an acetone – water solution is negative. Explain this in general terms that discuss intermolecular forces of attraction.
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11/28/20

Can someone help me answer this!

Magnesium oxide, MgO, and magnesium chloride, MgCl2, are very similar, white ionic solids with the following properties: Compound Melting Point... more
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11/28/20

Please help me with this question
For an ionic solid to melt, external energy must be applied to overcome the attractive forces holding its ions together. For example, sodium hydroxide must be heated to temperatures exceeding 318... more
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11/28/20

Chemistry HW help
Glucose,  is used as an energy source by the human body. The overall reaction in the body is described by the equationC6H12O6(aq)+6O2(g)⟶6CO2(g)+6H2O(l)Calculate the number of grams of oxygen... more
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11/28/20

Enthalpy of Formation
Substance H2O(l) H2O(g) CO2 (aq) CO2 (g) CO(g) CH4 (g) C2H6(g) Hfo (kJ/mole) -285.83 -241.82 -413.82 -393.51 -110.53 -74.81 -84.68 Use the enthalpy of formation data in the... more
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11/28/20

Enthalpy (Chemistry)
Calculate the enthalpy of the following chemical reaction:CS2(ℓ) + 3O2(g) ---> CO2(g) + 2SO2(g)Given: C(s) + O2(g) ---> CO2(g) ΔH = −393.5 kJ/mol S(s) + O2(g) ---> SO2(g) ΔH =... more
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11/28/20

Enthalpy (Chemistry)
Find the ΔH for the reaction below, given the following reactions and subsequent ΔH values:N2H4(l) + H2(g) → 2NH3(g)N2H4(l) + CH4O(l) → CH2O(g) + N2(g) + 3H2 (g)        ΔH = -37... more
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11/28/20

Enthalpy (Chemistry)
Find the ΔH for the reaction below, given the following reactions and subsequent ΔH values:FeO (s) + CO (g) --> Fe (s) + CO2 (g)      = ? Fe2O3 (s) + 3 CO (g) --> 2 Fe (s) + 3 CO2 (g)     ... more
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11/28/20

Enthalpy (Chemistry)
Consider the reaction: 2 SO2 (g) + 2 H2O (g) --> 2 H2S (g) + 3 O2 (g)Calculate the  rxn using the standard enthalpy of formation data provided.SO2 (g) -296.8 kj/molH2O (g) -241.8 kj/molH2S (g)... more
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11/27/20

Please help me with this chemistry question!
Use Hess's Law to completeShow all the steps2 C (s) + 2 H2 (g) = C2H4 (g) 1) C (s) + O2 (g) -------> CO2 (g) Delta H= -393.5 kJ2) H2 (g) + 1/2 O2 (g) -------> H2O (i) Delta H=... more
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11/26/20

How do you know if a covalent bond has formed?
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11/26/20

What kind of bond would form between copper and zinc? How do you know?
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11/26/20

A particular ion has a positive two charge. What does this indicate about the particle and its electrons?
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11/26/20

chemistry homework
A  4.05 g sample of an unknown gas at 59 C and 1.05 atm  is stored in a 2.55 L flask.What is the density of the gas?what is the molar mass of the gas? 
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11/26/20

I need help in Chemistry please please
Calculating Molar Masses of CompoundsJust add together the molar masses of all the elements in the compound (by Conservation of Mass). Distribute through the parenthesis when... more
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11/25/20

chemistry homework
Chlorine can be prepared in the laboratory by the reaction of manganese dioxide with hydrochloric acid, HCl(aq) , as described by the chemical equationMnO2(s)+4HCl(aq)⟶MnCl2(aq)+2H2O(l)+Cl2(g)How... more
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11/25/20

chemistry homework
The pressure of a sample of argon gas was increased from 1.56 atm  to 6.40 atm  at constant temperature. If the final volume of the argon sample was 17.0L  what was the initial volume of the argon... more
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11/24/20

Ions: Electron configuration
Write the complete electron configuration for the nickel(II) ion.Using NOBLE GAS notation write the electron configuration for the chromium(III) ion.
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11/24/20

Ions: Electron Configuration
Write the complete electron configuration for the common monatomic ion formed by the element bromine, Br.This ion is a(n) _______cationanion with a charge of____?
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11/24/20

Ions: Electron Configuration
Write the complete electron configuration for the chromium(III) ion.Using NOBLE GAS notation write the electron configuration for the iron(II) ion.
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11/24/20

What is the pH of a 7.0×10−3 M NH3 solution? (pKb = 4.74)
Can someone plz explain this to me plz?
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11/24/20

A few chemistry problems I need help with
A chemist ran a particular reaction at different temperatures to determine the activation energy of the reaction. The plot of his data displayed the following linear regression. Determine the... more
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11/23/20

Ion: Electron Configuration
Write the complete electron configuration for the iron(III) ion.Using NOBLE GAS notation write the electron configuration for the manganese(II) ion.
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11/23/20

Compound is CF2Cl2. Mass is 1.44 kg. How many moles are there?
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11/23/20

Compound is BrI. Mass is 21.8 mg. How many moles are there?
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