a hydrogen atom in the ground state absorbs a photon of light with a wavelength of 97.3nm causing the electron to jump to an unknown energy level. the electron then relaxes emitting a photon of light in the visible range, what is the wavelength of the emitted photon?

Write the dissociation reaction for the following acids in water H₂O. State whether the acid is a strong acid or a weak acid. Is the reaction reversible? Identify the acid, base, conjugate acid, and conjugate base.

State the Dissociation reaction, Strong or Weak Acid, Is it reversable, Acid, Base, Conjugate Acid, Conjugate Base for each. PLEASE SHOW WORK, AND EXPLAIN.

1. H₂CO₃

2.HCI

3. HNO₃

4. Write the equation that represents the reaction of hydrochloric acid in water.

Conjugate acid-base pair that includes hydrochloric acid:

Conjugate acid-base pair that does not include hydrochloric acid:

Does water act as an acid or a base in this reaction?

2H2S(g)<---> 2H2(g) + S2(g)

The value of Kc for the thermal decomposition of hydrogen sulfide is 2.2x10^-4 at 1400 K. A sample of gas which [H2S]=4.60 M is heated to 1400 K in a sealed vessel. After chemical equilibrium has been achieved, what is the value of [H2S] in M? Assume no H2 or S2 was present in the original sample.

A pediatrician orders Cephalexin 12.5 mg/ kg by mouth (po) every 12 hours (bid). The child weighs 33 pounds (lbs). The pharmacist provides you with Cephalexin oral suspension 100 mg/mL. How many milliliters (mL) of Cephalexin will you administer bid? (1 kg = 2.2 lbs) HLEP! I NEED ANSWER ASAP!

Consider the dissociaton of methane, into the elements H2g and C(s) given

a) the change of enthalpy of reaction is -74.85 kJ/mol and change of entropyof reaction is -80.67 J/mol K at 298K. Calculate the Keq at 298K.

b) Assuming that change in enthalpy of formation is independent of temperature, calculate K at 323K.

c) Calculate the degree of dissociation of methane at 298K and Ptotal at 0.01 bar.

Using 1.8*10^-5 for the Ka for acetic acid, along with the weight of sodium acetate and volume of acetic acid used to prepare a buffer, calculate the expected pH of the buffer.

So the weight is 4.0089 g and the volume is 100mL

Many different ways have been proposed to make batteries. One cell is set up with copper and lead electrodes in contact with CuSO4(aq) and Pb(NO3)2 (aq), respectively. If the Pb2+ and Cu2+ concentrations are each 1.0 M, what is the overall cell potential?

Pb2+ + 2e- ---> Pb E = -0.22 V

Cu2+ + 2e- ----> Cu E = +0.34 V

answer: 0.56 V. how?

Q.N.2) A portion of a specicific DNA molecule consists of the following sequence of nucleotide triplets:

TAC   GAA    CTT  CGG

What is the DNA sequence codes for this terapeptide?

. Consider the following reduction-oxidation “skeleton” equation,

Br2(l) = BrO3 ‒ (aq) + Br‒ (aq)

a. Write a balanced equation for the reduction-oxidation reaction that occurs in basic solution.

b. Using your balanced equation, identify the chemical species that is: (1) oxidized, (2) reduced, (3) the reducing agent, and (4) the oxidizing agent.

How many oxygen atoms are present in 373 g of mannose, C6H12O6?

Calculate the pH for each of the following cases in the titration of 50.0 mL of 0.170 M HClO(aq) with 0.170 M KOH(aq). The ionization constant for HClO can be found here.

At constant volume, the heat of combustion of a particular compound is –3680.0 kJ/mol. When 1.029 g of this compound (molar mass = 150.46 g/mol) was burned in a bomb calorimeter, the temperature of the calorimeter (including its contents) rose by 4.773 °C. What is the heat capacity (calorimeter constant) of the calorimeter?

Why is kcat not necessarily the best way to evaluate or compare the activities of two enzymes? What “adjustment” can be made to make the term more useful and why? A) Define the rate constants k1, k2 and k-1. Given k1 of 2x10^-8/M s, k2 of 5x10^3/s, and k-1 of 1x10^3/s, what is KD? what is KM? B) Which substrate is preferred: R, for which enzyme X has a KM of 2mM? OR Q, for which X has a KM is 7mM? Explain. If k2 for Q is 2x10^4/s and for R is 4x10^5/s, which substrate yields the best catalytic efficiency? Explain.

3)Suppose a solution is prepared by dissolving 15.0 g NaOH in 0.150 L of 0.250 M nitric acid. What is the final concentration of OH- ions in the solution after the reaction has gone to completion. Assume that there is no volume change when adding the grams of NaOH.

100 mL of buffer solution that is 0.15M HA (K_a= 6.8x10^-5) and 0.20M NaA is mixed with 34.8mL of 0.35M NaOH. What is the pH of the resulting solution?