Question-
1) From the perspective of a chemist, describe what a crystal is. Choose two examples of crystals, and describe how they are chemically similar to and different from one another.
2) Explain the relationship between "vapor pressure" and the common phases "solid," "liquid," and "gas."
Question-
How many phosphorous atoms does the DNA contain?
Question-
Although the fact that oxygen is a nonflammable gas, what is the most probable reason OSHA requires bulk oxygen storage systems to be installed in either outdoors aboveground or within a building of noncombustible construction (exclusive and vented use)?
a- Oxygen supports the combustion of many common materials; thus, this regulation is meant to minimize the risk of fire and explosions.
b- Oxygen suppresses flammable liquid or caustic fires; thus, this regulation augments the selective positioning of fire retardant materials and supplies.
c- The explosive nature of LOX material necessitates its storage in these locations.
d- The hyperbaric attributes of oxygen necessitate its storage in these locations.
Question-
1. The volume of a single chromium atom is 8.10E-24 cm3. Describe the volume of a chromium atom in microliters?
2. The mass of a single copper atom is 1.06E-22 grams. How many copper atoms would there be in 159 milligrams of copper?
Question-
The product gas, H2, is collected over water at a pressure of 757 mm Hg and a temperature of 25 oC. If the wet H2 gas formed occupies a volume of 9.67 L, the figure of grams of H2 formed is ________ g. The vapor pressure of water is 23.8 mm Hg at 25oC.
Question-
How many moles of nitrogen would be required to make 10.0 moles of ammonia?
Question-
A ruby laser produces radiation of wavelength 633 nm in pulses whose duration is 2.00 x 10-9 s. If each pulse contains 1.20 x 1018 photons and what is energy of each pulse?
Question-
The radius of a palladium atom is 137 pm. How many palladium atoms would have to be laid side by side to span a distance of 4.28 mm?
Question-
The subsequent temperature/composition data were obtained for a mixture of two liquids A and B at 1.00 atm, where X is the mole fraction in the liquid and y the mole fraction in the vapour at equilibrium.