03/21/20

What is the pH after 0.02 mol of Ba(OH)2 are added to 0.68 L of the solution?
A buffer that contains 0.3 M of acid, HY and 0.32 M of its conjugate base Y-, has a pH of 3.06. What is the pH after 0.02 mol of Ba(OH)2 are added to 0.68 L of the solution?The answer is 3.23
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03/21/20

which of the following is the abbreviation for unit of energy?
K(degrees sign)C calW
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03/21/20

Calculate the pH of a solution
Calculate the pH of a solution that results from mixing 43 mL of 0.13 M HCN(aq) with 48 mL of 0.11 M NaCN. The Ka value for HCN is 4.9 x 10-10.My answer was 4.71The correct answer is 9.29Why is... more
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03/21/20

A 1.95 g sample of an unknown gas at 63 ∘ C and 1.10 atm is stored in a 1.75 L flask. What is the density of the gas?
What is the molar mass of the gas?
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03/21/20

This is a chemistry about the phases and the gas law formulas.

Does the identity of the gas matter when using the gas law formulas? Why or why not? Yes, because the volume of a gas depends on its molar mass. No, except for the ideal gas law, which includes the... more
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03/21/20

Calculate the pH during the titration of 20.00 mL of 0.1000 M
Calculate the pH during the titration of 20.00 mL of 0.1000 M dimethylamine, (CH3)2NH(aq), with 0.1000 M HCl(aq) after 21 mL of the acid have been added. Kb of dimethylamine = 5.4 x 10-4.The answer... more
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03/21/20

This is a chemistry question about the gases problems.

Of the phases of matter commonly studied in chemistry, which phase has some regular behaviors independent of the identity of the substance involved?
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03/21/20

This is an chemistry problem about calories and i need help do it. Thanks.
Lean ground beef is 20.0% fat, 18.0% protein, and 62% non-caloric components (mostly water). What are the Calories in a 100.0-gram serving of lean ground beef? Give your answer to three significant... more
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03/21/20

Chemistry solutes and solvents
If Luke mixes 20 g of NaCl (formula wt. of 40g/mol) with enough water to make 500mL of solution. (1L=1000mL); what is the Molarity (M) of the solution ? (SW)
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03/21/20

Chemistry solutes and solvents
If Matt mixes 1 mol of NaCl (table salt) with enough water to make 2 L of solution; what is the Molarity (M) of the table salt solution (SW) what is the solute? What is the solvent?
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03/21/20

Ordered 15 g of Amoxicillin. Amoxicillin is available as 10 g per 20 mL. How much will the MA draw up?
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03/19/20

Calculate the ∆H for the following reaction: 2H2O2 🡪 2H2O + O2

You are given these two equations: 2H2  +  O2 🡪   2H2O  ∆H = -572 kJ H2  + O2 🡪 H2O2  ∆H = -188 kJ 
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03/19/20

How many grams of ZnCl2 will be produced from 22.0g of Zn and 14.0g of HCl
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03/19/20

What is the pH after 0.018 mol of Ba(OH)2 are added to 0.82 L of the solution?
A buffer that contains 0.35 M of acid, HY and 0.3 M of its conjugate base Y-, has a pH of 4.8. What is the pH after 0.018 mol of Ba(OH)2 are added to 0.82 L of the solution?The answer is 4.92
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03/19/20

how do you convert pressures in mmHg to pressure in atm
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03/19/20

Calculate the ∆H for the following reaction: Sn + 2Cl2 🡪 SnCl4

You are given these two equations: Sn  +  Cl2 🡪 SnCl2  ∆H = -325 kJ  SnCl2 + Cl2 🡪 SnCl4  ∆H =   -186 kJ  Thermochemistry - Hess Law
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03/19/20

Chemistry work help
Write the balanced molecular equation and net ionic equation for the neutralization reaction between hydrochloric acid and strontium hydroxide. Include the phase of each species.molecular... more
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03/19/20

Chemistry work help
For the chemical reactionHClO4(aq)+NaOH(aq)⟶H2O(l)+NaClO4(aq)write the net ionic equation, including the phases.net ionic equation:Which ions are considered spectator ions for... more
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03/19/20

Chemistry Help work
Enter the net ionic equation, including phases, for the reaction of AgNO3(aq) and KCl(aq). Refer to the  as needed.
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03/19/20

Methyl Red is water soluble. Why??
SO I have the qurstion: Which functional groups make methyl red water soluble? so im thinking the CO2H but don't know about the diazenyl or the dimethylamino group because they both have nitrogen... more
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03/19/20

calculate the __ for the combustion reaction?
A 0.608-g sample of quinizarin (C14H8O4) is burned in a bomb calorimeter and the temperature increases from 25.70 °C to 28.19 °C. The calorimeter contains 1.18×103 g of water and the bomb has a... more
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03/19/20

the standard enthalpy is

A scientist measures the standard enthalpy change for the following reaction to be -137.6 kJ:NH4NO3(aq) N2O(g) + 2 H2O(l)Based on this value and the standard enthalpies of formation for the other... more
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03/18/20

How many bonds does each carbon, oxygen and hydrogen atom form in glucose?
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03/18/20

How many bonds does each carbon, oxygen and hydrogen atom form in maltose?
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03/18/20

the final temperature is
A chunk of magnesium weighing 18.1 grams and originally at 98.92°C is dropped into an insulated cup containing 76.4 grams of water at 23.86°C.Assuming that all of the heat is transferred to the... more
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