06/05/20

Differentiate between Subscript and Coefficient using the following molecule . Which is the subscript and what does it tell us AND what is the coefficient and what does it tell us? 3LiCl2
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06/04/20

Chemistry Questions
1. If a diluted saline solution was 20 v/v% and you poured out 200mL, what amount (mL) of it would actually be the solute?2. What is the molar concentration of chloride ions when 50 grams of lead... more
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06/04/20

Which of the following is a conjugate acid-base pair
Which of the following is a conjugate acid-base pair?a)NaF and F^-b)None of thesec)NH2^- and NH4^+d)H2O and O2-e)All of these
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06/04/20

Which of the following is a conjugate acid-base pair?
Which of the following is a conjugate acid-base pair?a)NaF and F ^-b)H3O^+ and OH^-c)None of thesed)all of thesee) HNO3 and HNO2
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06/04/20

100 ml each of a 0.003M solution of Ba^2+ (aq) and a 0.002M solution of CO3^2- (aq) are mixed. Will a precipitate form?
100 ml each of a 0.003M solution of Ba^2+ (aq) and a 0.002M solution of CO3^2- (aq) are mixed. Will a precipitate form?ksp for BaCo3= 5.0*10^-9a)precipitate will formb)system is at equilibrium... more
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06/04/20

A student carried out the following reaction in a coffee cup calorimeter:

A student carried out the following reaction in a coffee cup calorimeter: CaO +2HCl → H2O +CaCl2She used 4.7 g of reactant and 155.5 g of acid. The initial temperature of the system was 23.8°C and... more
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06/04/20

Determine the enthalpy change for the reaction represented by the equation below: 
Determine the enthalpy change for the reaction represented by the equation below: P4O10(s) +6PCl5(g) → 10POCl3(g)Use Hess's Law along with the following... more
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06/04/20

Use values of standard enthalpies of formation to calculate the enthalpy change for the reaction below:

Use values of standard enthalpies of formation to calculate the enthalpy change for the reaction below: NH3(g)+HCl(g) → NH4Cl(s)Give the quantity and unit (kJ) and don't forget the + or - sign. 
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06/04/20

Use values of standard enthalpies of formation to calculate the enthalpy change for the reaction below: 
Use values of standard enthalpies of formation to calculate the enthalpy change for the reaction below: MgO(s)+H2O(l) → Mg(OH)2(s)Give the quantity and unit (kJ) and don't forget the + or - sign.
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06/04/20

Acetone (molar mass of 58.08 g/mol....
Acetone (molar mass of 58.08 g/mol) is a common industrial solvent and has a heat of vaporization of +31.3 kJ/mol. If 1.0g of acetone is spilt, how much energy (in J) will it absorb as it... more
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06/04/20

The molar enthalpy of solution for ammonium chloride is +14.8 kJ/mol. What is the final temperature observed when 20.0g of a....
The molar enthalpy of solution for ammonium chloride is +14.8 kJ/mol. What is the final temperature observed when 20.0g of ammonium chloride is added to 125 mL of water at 20.0°C ? Give only the... more
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06/04/20

What is the enthalpy change (in kJ) when 60.0 g of potassium metal reacts according to the following equation? Give the quantity and unit, and don't forget the + or - sign.
What is the enthalpy change (in kJ) when 60.0 g of potassium metal reacts according to the following equation? Give the quantity and unit, and don't forget the + or - sign.2K +2H2O → H2 + 2KOH +160 kJ more
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06/04/20

Use values of standard enthalpies of formation to calculate the enthalpy change for the reaction below:

Use values of standard enthalpies of formation to calculate the enthalpy change for the reaction below: CO(g)+2H2(g)→ CH3OH(l)Give the quantity (rounded to the nearest whole number) and unit (kJ)... more
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06/04/20

Use values of standard enthalpies of formation to calculate the enthalpy change for the reaction below:
Use values of standard enthalpies of formation to calculate the enthalpy change for the reaction below:C2H5OH (l)+3O2(g)——>2CO(g)+3H2O(l)give the quantity and unit (kJ) and don’t forget the + or... more
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06/03/20

A student carried out the following reaction in a coffee cup calorimeter:

A student carried out the following reaction in a coffee cup calorimeter: CaCO3 +2HCl → CO2 +H2O +CaCl2She used 4.2 g of reactant and 170.2 g of acid. The initial temperature of the system was... more
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06/03/20

We can represent the reaction using the reaction

We can represent the reaction using the reaction mechanism below:6I^-(aq)+BrO3^-(aq)+6H(aq)——> 3I2(aq)+Br^-(aq)+3H2O(L). (Slow)I2(aq)+2S2O3^2-(aq)——>2I^-(aq)+S4O6^2-(aq).... more
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06/02/20

A very weak base produces a weak conjugate acid
A very weak base produces a weak conjugate acida)Trueb)False
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06/02/20

Complete and balance the molecular equation for the reaction of aqueous sodium sulfate, Na2SO4, and aqueous barium nitrate, Ba(NO3)2. Include physical states.
Find the molecular equation and the balanced net ionic equation for this reaction. Include physical states.
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06/02/20

Complete and balance the molecular equation for the reaction of aqueous iron(III) nitrate, Fe(NO3)3 , and aqueous lithium hydroxide, LiOH. Include physical states.
Find Molecular Equation and the balanced net ionic equation for the reaction. Include physical statesFe(NO₃)₃(aq) + 3 LiOH(aq) → Fe(OH)₃(aq) + 3 LiNO₃(aq) was incorrect
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06/02/20

A chemist is investigating the chemical system

A chemist is investigating the chemical system  2NO(g)⇌ N2(g)+O2(g) Initially, she places 1.6 mol of nitric oxide, 1.6 mol of nitrogen, and 0.60 mol of oxygen in a 1.00 L vessel. At equilibrium,... more
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06/02/20

Suppose that 3.00 mol of NO(g) is introduced into a 1.00L flask. When the system comes to equilibrium, 1.00 mol of N2O (g) has formed.
Suppose that 3.00 mol of NO(g) is introduced into a 1.00L flask. When the system comes to equilibrium, 1.00 mol of N2O (g) has formed.2N2O(g)+O2(g)⇌ 4NO(g)What is the equilibrium concentration... more
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06/02/20

Consider the following reaction:
Consider the following reaction:A + 2B⇌2Ck=10What is K for the reaction 2A +4B ⇌ 4Ca)none of theseb)20 c)100d)the same
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06/02/20

Consider the following chemical system:
Consider the following chemical system:CH3NH2 +HSO4^− ⇌ CH3NH3^+ +SO4^2−Which is true about this system?a)CH3 NH2 is an acid and CH3 NH3^+ is its conjugate baseb)CH3 NH2 is an base and SO4^2- is... more
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06/02/20

Consider the following chemical system:
Consider the following chemical system:CH3COOH +NH3 ⇌ CH3COO^− +NH4^+Which is true about this system?a)NH3 is an acid and NH4^+ is its conjugate baseb)CH3 COOH is an acid and CH3 Coo^- is its... more
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06/02/20

Determine ΔH° for the production of coal gas using Hess’ Law.
Determine ΔH° for the production of coal gas using Hess’ Law. (HINT, the answer is given in the next line and using the next 3 individual questions to get the answer, it’s a puzzle.) 2C... more
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