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What volumes of 0.150 M acetic acid and 0.065 M NaOH solutions must be mixed to prepare 1.00L of a buffer solution of pH 4.50 at 25C.(Show all work for 5 stars)
Why is the dissolving of salt sometimes an exothermic and sometimes an exothermic process
Volume of water used, mL: 75.0ml Initial temperature of water: 23.4 degree celsius Mass of salt taken, g: 5g Moles of salt taken, mol: 0.0625mol Highest/lowest temperature,: 24.0/20.1 Calculate heat
A 66 kg solid sphere with a 14 cm radius is suspended by a vertical wire. What is the period of the oscillations
The student adds 6 M NH3 to CuSO4 solution until the Cu 2+ ion is essentially all converted to Cu(NH3)4 2+ ion. The voltage of the cell goes up to 0.92 V and the Cu electrode is still negative. Find
The neutral OH molecule has been implicated in certain ozone-destroying processes which take place in the upper atmosphere. a.) Assuming the electron added to OH is entirely localized in a single at
A rock is thrown downward from the top of a 39.8-m-tall tower with an initial speed of 9 m/s. Assuming negligible air resistance, what is the speed of the rock
(i) Arrange the following compounds in the order of increasing melting points: (a) He, (b) NH3, (c) LiBr, (d) Ar, (e) CsBr, (f) PH3, (g) CsI, and (h) RbBr. (ii) Separately, also arrange these compou
The potential difference between the surface of a 3.1 cm diameter power line and a point 1.8 m distant is 5.0 kV. What is the line charge density on the power line
A ball bearing is dropped from rest at a point A. At the instant it passes a mark 4.0 m below A, another ball bearing is released from rest from a position 5.0 m below A, How far does the second be
A bird flies 3.6km due west and then flies 1.2km due north, What is the angle between the net displacement vectors of the 2 birds
A model rocket is fired upward. The rocket's average initial acceleration is 38.5 m/s2 until the fuel burns out in 0.825 s. How high does the rocket go
Electron affinity can be defined for molecules just as it is defined for single atoms. Write a complete chemical equation representing the electron affinity of OH. Include all relevant state symbols
A 1.27 g sample of a gaseous oxide of nitrogen occupies a volume of 1.07 L at 25°C and 737 mmHg. What is the most likely formula for the gas. A. NO2 B. N2O C. NO D. N2O4
Mass(volume)of cold water:75.0g Temperature of cold water: 23.0 degree celsius Mass(volume) of hot water: 75.0g Final temperature: 41.1 degree celsius find the temperature change and the calorimeter
Suppose that on earth you can throw a ball vertically upward a distance of 1.02 m. how high could you throw a ball on Pluto
You throw a ball straight down from an apartment balcony to the ground below. The ball has an initial velocity of 4.95 m/s, Find the height of the balcony
What effect on the calorimeter constant calculated would be observed if the calorimeter cup were made of a conducting material(such as metal)rather than plastic foam
what is the total pressure in the reaction flask at the end of the reaction? What are the partial pressures of the gases in the flask? 4A(g) + 6B(g) ? 2A2B3(g)
A research Van de Graaff generator has a 3.80 m diameter metal sphere with a charge of 1.06 mC on it. What is the electric potential on the surface of the sphere
Suppose the speed of light were only 3000 m/s. A jet fighter moving toward a target on the ground at 600 m/s shoots bullets, What are the bullets' velocity relative to the target
Calculate the partial pressure of water at 23.6 Celsius by interpolation from the vapor pressure table.
A unit of heat energy that was formerly used frequently calorie. Look up the definition of calorie in your textbook or a handbook and record it here.
The linear molecule FeH2 has been observed in the gas phase. Assume that the iron atom can potentially use s, p, and d orbitals to interact with the hydrogens. If the z axis is collinear with the mo