1. Complete both questions: a. Prove that HSO₄^-  can act as an amphoteric substance. b. Explain why CH₄ cannot act as an amphoteric substance.

2. Try this question again. Be sure to use claim-evidence-reasoning when you format your answer and be sure to show your work for any calculations performed to develop your evidence. Which is more dangerous if you spill it on your hand a 0.025 M HBr solution (Ka = 1.3 x 10⁶ ) or 0.75 M HClO₂ solution (Ka = 1.2 x 10^-2 )?

3.  For each pair below indicate which is stronger and support your answer with an explanation. a. Which is a stronger acid, H₂S or PH₃? b. Which is a stronger base CO₃^-2  or C₂H₅O^-  ?

4. Calculate the equilibrium concentration of NO in the reversible reaction below using the initial concentrations given for each reactant and product. The equilibrium constant for the reaction is Kp = 20. 2 NO (g) ⇌ N2 (g) + O2 (g) Initial concentrations: [N2] = 0.5 atm, [O2] 0.5 atm, [NO] = 0.75 atm

Use the Ksp value in the table to calculate the molar solubility of AgBr, Fe(OH)2, and PbBr2 in pure water

The pKapKa of hypochlorous acid is 7.530. A 60.0 mL solution of 0.130 M sodium hypochlorite (NaOCl) is titrated with 0.335 M HClHCl.

Calculate the pH of the solution after the addition of 7.85 mL of 0.335 M HClHCl.

pH= ???

Calculate the pH of the solution after the addition of 24.6 mL of 0.335 M HClHCl.

pH= ???

Calculate the pH of the solution at the equivalence point with 0.335 M HCl.

pH= ???

If a balloon has a volume of 1.900 L at a pressure of 1.947 atmospheres, what will be the volume of the balloon if the pressure is increased to 4.624 atmospheres?

Give your answer to four significant figures.

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Question

Buffy carries out a neutralization reaction in her styrofoam cup calorimeter, with a heat capacity of 41 J/C. She mixes 25.0mL of 3.0M acid solution and 25.0mL of 3.0M base solution at 22.3 degree C. The temperature rose to 36.5 C. D=1.03 g/ml and Heat Capacity= 4.05 J/g*C

-Calculate heat energy absorbed by solution (qsolution)

-Calculate heat energy absorbed by the calorimeter (qcalorimeter)

-Calculate q reaction

-calculate number of moles of acid reacting

-calculate delta H neut. of the reaction in joules/mole

Combustion analysis of a 0.2608 g sample of a compound containing carbon, oxygen, and hydrogen only produced 0.5501 g of carbon dioxide, and 0.2703 g of water.

Determine the empirical formula of this compound. If the molar mass for this compound is 104.1 g/mole, find the molecular formula. Write a complete balanced equation for the combustion reaction of this compound.

What kind of shift occurs when you add KNO3 to the equilibirum reaction: Fe3+ + SCN- <=> FeSCN2

i know the reaction turns into an orange color

Ethanol is commonly referred to simply as alcohol or spirits, It is the principal type of alcohol found in alcoholic beverages. It is a psychoactive drug and one of the oldest recreational drugs used by humans. It can cause alcohol intoxication when consumed in sufficient quantity. It is a volatile, flammable, colorless liquid with the structural formula CH3CH2OH. The density of an aqueous solution containing 45 weight percent ethanol is 0.92472 g/mL.

a) A person weighing 75 kg takes a swallow of an alcoholic beverage corresponding to 25 gram of pure ethanol. It is assumed that the alcohol mixes evenly in person´s water phase, constituting 62 % of the person´s weight. Calculate the person´s ethanol mass per mille (alkoholpromille in Danish).

b) The vapor pressures of ethanol (C2H5OH) and 1-propanol (C3H7OH) at 35 oC are 100.0 mmHg and 37.6 mmHg, respectively. Assume ideal behaviour and calculate the partial pressures of ethanol and 1-propanol at 35 oC over a solution of ethanol in 1- propanol, in which the mole fraction of ethanol is 0.200.

Nitrous acid has a K_a of 4.0x10^-4. Calculate the pH when 40.00 mL of 0.125 M HNO₂ is titrated against 0.200 M NaOH and reaches the equivalence point.

Which has the highest Z_eff for its valence electron?

A) He

B) Si

C) K

D) H

And why?

generate a titration curve from the information provided: your titrand is 48.0 mL of 0.500 M lactic acid and you will be titrating with 1.0 M KOH.

Balance the following redox equations by the ion-electron half-reaction method: (a) (acid solution): ClO3 – + I– → I2 + Cl- (b) (acid solution): Cr2O7 2– + U4+ → Cr3+ + UO2 2+ (c) (basic solution): Cr3+ + Cl2 (g) → CrO4 2– + Cl–

How many grams of aluminum sulfite will be formed from 125mL of a 0.25 M solution of sulfurous acid. Complete this question by ansering the following:

a ) How many moles of sulfurous acid are present in 125 mL of a 0.25M solution?

b) What is the molar ratio of sulfurous acid to aluminum sulfite?

c) How many moles of aluminum sulfite will be produced?

d) What is the molar mass of aluminum sulfite?

e) How many frams of aluminum sulfite will be produced?

How much heat is evolved in converting 1.00 mol of steam at 130.0 ∘C to ice at -50.0 ∘C? The heat capacity of steam is 2.01 J/(g⋅∘C) and of ice is 2.09 J/(g⋅∘C).