General Chemistry Answers

A phanton of 498nm was emitted from a silicon atom. Calculate the energy of all the Atomic levels of silicon and show that the atomic level is quantized

A photon of 498nm was emitted from a silicon atom. Calculate the energy of all the atomic levels of silicon and show that the atomic levels are quantized.

The power needed to drive a certain fan can be computed as follows:

Power(kW)=2.72×10−5QP

Power(kW)=2.72×10−5QP

where Q is the fan volume in m³/h and P is the total discharge pressure in cmH₂O.

a. What is the corresponding unit of the formula constant?

b. Transform the formula to compute power in horsepower (hp), using fan volume in ft³/min and pressure in inH₂O.

A liquid has a specific gravity of 0.90 at 25 °C. What is its 

a. density at 25 °C in kg/m³? 

b. specific volume at 25 °C in ft³/lb? 

c. If the liquid is placed in a 1.5-L bottle that has a mass of 232 g, how much will the full bottle weigh? 

Write the species amphiprotic chemical reaction of

NH3

HPO4

Br

NH4

ASO4

S

.The concentration of a solution of EDTA was determined by standardizing against a solution of Ca2+ prepared from the primary standard CaCO3. A 0.4071-g sample of CaCO3 was transferred to a 500-mL volumetric flask, dissolved using a minimum of 6 M HCl, and diluted to volume. A 50.00-mL portion of this solution was transferred into a 250-mL Erlenmeyer flask and the pH adjusted by adding 5 mL of a pH 10 NH3–NH4Cl buffer containing a small amount of Mg2+–EDTA. After adding EBT as a visual indicator, the solution was titrated with the EDTA, requiring 42.63 mL to reach the end point. Report the molar concentration of the titrant

Compare and contrast the 3 Bravais lattice of the cubic crystal system.