stefani

1.(a)A centrifuge accelerates from rest with an angular acceleration of 30rad/s^2.What is the angular velocity of the centrifuge after 30s?(b)The angular velocity of an auto mobile engine accelerates from 800rpm to 3000rpm in 15s.calaculate the engines an...

18 years ago

To increase interest in rodeos, the local chapter of the National Rodeo Cowboys Association (NRCA) is offering free roping lessons to students in the sixth and seventh grades. An exchange will take place because:

14 years ago

You are playing volleyball. You hit the volleyball with an initial vertical velocity of 15 feet per second when it is 4 feet above the ground. Find how many seconds it takes to reach the maximum height, the maximum height reached, and the time the object...

12 years ago

How much energy in kJ is released when 17.55 g of water at 47.5 °C is cooled to –33.5 °C? M.P. = 0 °C; B.P. = 100 °C; All specific heats in J/(g*K): s(ice) = 2.03; s(water) = 4.184; s(steam) = 1.890. heat of fusion = 6.01 kJ/mol; heat of vaporization = 40...

5 years ago

What is the vapor pressure (in torr) of a solution comprised of 220 g of CaCl₂ in 870 g of H₂O at 25 °C where H₂O has a pressure of 23.76 torr? Assume complete dissociation.

5 years ago

What is the freezing point (in °C) of a solution with 60.6 g of NaCl dissolved in 1050 g of H₂O? Assume complete ionization.

5 years ago

If a solution consists of compounds A and B, and the mole fraction of A = 0.753, what is the mole fraction of B?

5 years ago

What is the vapor pressure (in torr) of a solution comprised of 220 g of ethanol (C₂H₅OH) in 870 g of H₂O at 25 °C where H₂O has a pressure of 23.76 torr?

5 years ago

What is the osmotic pressure (in atm) when 69.7 g of a solute (MW = 2790 g/mol) is dissolved in 1.00 L of a solution at 20 °C?

5 years ago

Suppose 1.500 g of a compound is dissolved in 35.00 g of camphor. The freezing point of pure camphor is 178.75 °C, the freezing point of the solution is 164.4 °C and Kf(camphor) = 37.7 °C*kg/mol. Assume this compound does not dissociate. What is the molec...

5 years ago

A sample of seawater taken from the Atlantic Ocean freezes at –2.14 °C and a sample from the Arctic Ocean freezes at –1.96 °C. Assume i = 2. What is the molality of the Atlantic Ocean sample? What is the molality of the Arctic Ocean sample?

5 years ago

Consider an electrochemical cell where the following reaction takes place: 2 Au³⁺(aq) + 3 Zn(s) → 2 Au(s) + 3 Zn²⁺(aq) What is the correct cell notation for this cell?

5 years ago

E° for the following redox reaction is +1.05 V. 2 Ag⁺ (aq) + Ni(s) → 2 Ag(s) + Ni²⁺(aq) What is ΔG° for this reaction?

5 years ago

The following redox reaction can be used to form iodine. Br₂(aq) + 2 I -(aq) → 2 Br-(aq) + I₂(aq) ΔG° = -105 kJ What is E° for this reaction?

5 years ago

Given the two following half reactions: Ni²⁺(aq) + 2e⁻ → Ni(s) E° = -0.25 V; Hg²⁺(aq) + 2e⁻ → Hg(l) E° = +0.86 V. Calculate E° for the following reaction: Hg²⁺(aq) + Ni(s) → Ni²⁺(aq) + Hg(l)

5 years ago

An electrochemical cell of notation Pd | Pd²⁺ || Cu²⁺ | Cu has E° = -0.65 V. If we know that the standard reduction potential of Cu²⁺/Cu is E° = 0.34 V, what is the standard reduction potential for Pd²⁺/Pd?

5 years ago

Given the following two half reactions: Cd²⁺(aq) + 2e⁻ → Cd(s) E° = -0.40 V; Zr⁴⁺ (aq) + 4e⁻ → Zr(s) E° = -1.53 V. Determine E° and the spontaneity of the following reaction: 2 Cd²⁺(aq) + Zr(s) → 2 Cd(s) + Zr⁴⁺ (aq)

5 years ago

Determine the cell potential for Mg(s) + 2 Ag⁺(aq) → Mg²⁺(aq) + 2 Ag(s) where [Ag⁺] = 0.30 M and [Mg²⁺] = 0.020 M using the following standard reduction potentials. Mg²⁺(aq) + 2e⁻ → Mg(s) E° = -2.37 V and Ag⁺(aq) + e⁻ → Ag(s) E° =+0.80 V.

5 years ago

Consider an electrochemical cell where the following reaction takes place: 3 Sn²⁺(aq) + 2 Al(s) → 3 Sn(s) + 2 Al³⁺(aq) Which of the following is the correct cell notation for this cell?

5 years ago

If we electrolyze a solution of Ni²⁺(aq) to form Ni(s) and use a current of 0.15 amps for 10 minutes, how many grams of Ni(s) are produced?

5 years ago

Why did ethnic tensions in Russia and the Republics seldom result in armed conflict before the 1990s?

8 years ago

whoops haha! Al | Al³⁺ || Sn²⁺ | Sn Al³⁺ | Al || Sn | Sn²⁺ Sn | Sn²⁺ || Al³⁺ | Al Sn | Al³⁺ || Al | Sn²⁺

5 years ago