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Assign an oxidation state to each element in each compound. Express all answers as a signed integer. 1. Na3PO4 2. Hg2S 3. Fe(CN)3 4. NH4Cl
a sound wave traveling in 26 degrees C air has a pressure amplitude of 0.500 Pa. (assume that the density of air is 1.29 kg/m^3). What is the intensity of the wave
A 542 Hz sound wave travels through a substance. The wavelength of the sound wave is measured to be 1.9 meters. What is the speed of sound in the substance
Use oxidation states to identify the oxidizing agent and the reducing agent in the following redox reaction. Express both answers as chemical formulas. 1. 2Na(s)+2H2O(l)--->2NaOH(aq)+H2(g)
Assign an oxidation state to each atom in each polyatomic ion. Express answers as a signed integer. 1. CrO4^2- 2. Cr2O7^2- 3. PO4^3- 4. MnO4^-
Rank the following nitrogen compounds in order of decreasing oxidation number for nitrogen. Rank from highest to lowest oxidation states. N2,NO2,NO2-,NH3,NO^-3,NO
When the Vmax and the Km of an enzyme are not known, it is essential to determine the enzyme's initial velocity (Vo) at different [S]. To determine the initial velocity, one would have to: Select on
The red block in the %u201CSame Volume%u201D floats in water. what volume of the blue block would float above the water line if the blue block was placed on top of the red block in the water
What is the oxidation number of the monoatomic ions of the following elements. Sr,Rb, Na, Al,O,Se, Ba,I, Fr, Cl, N
Suppose an electric eel touches the head and tail of a long, approximately cylindrically shaped fish and applies a voltage of 600V across it. estimate the overall resistance of the fish
Imagine holding the above plastic block under water. When released, what is the upward acceleration of the block
For each reaction, identify the substance being oxidized and the substance being reduced. Express answers as chemical formulas for oxidized and reduced answers. 1. 2Sr(s)+O2(g)----->2SrO(s) 2. C
A spherical conductor is charged so that its surface potential is Vo=1000V. If the radius of the sphere is R=10m, what is the potential in the center of the sphere
The electric potential on the surface of a conductor (in static equilibrium) is 5V. find electric potential in the interior of the conductor
If an automobile air bag has a volume of 12.2 L, what mass of NaN3 (in g) is required to fully inflate the air bag upon impact. Assume STP conditions. 2NaN3(s) --> 2Na(s) + 3N2 (g)
A 25-g string is streched with a tension of 43.0 N between two fixed points 12.0 m apart. What is the frequency of the second harmonic
The verical displacement of a string is given by y(x,t)=(6.00 mm) cos[(3.25m^-1)x-(7.22s^-1)t]. What is the speed of the wave
One component of a magnetic field has a magnitude of 0.0406 T and points along the +x axis, Determine the angle that the net force makes with regard to the +x axis
A man driving a car toward a large vertical wall sounds his horn. The car is traveling at 81 km/h. What is the frequency of the cars horn
Calculate the pH of the solution formed by the addition of 55.5 mL of 0.100 M NaOH to 49.2 mL of 0.100 M H3PO4.
The howler monkey is the loudest land animal and can be heard up to a distance of 1.3km. determine The acoustic power emitted by the howler
Calculate the potential of a hydrogen ( p= 1.02 atm) electrode in an aqueous solution of HBr (0.05 m ) at 298 K A) assuming ideal solute behavior. B) using the Deby- Huckel equation.
Which one of the following salts, when dissolved in water, produces the solution with the highest pH. and WHY. KCl, KF, KI, KBr
A voltaic cell consists of a standard H2 electrode in one half-cell and a Cu/Cu2+ half-cell. Calculate [Cu2+] when Ecell is 0.25 V
The rate constant of the reaction: a. Depends on the concentration of reactants b. Describes the rate of the reaction when it reaches equilibrium c. Is a thermodynamic constant that is always true f