The wavelength is 9,375,000,000 meters. The equation relating frequency and wavelength is wavelength = speed of light / frequency.
The answer is organisms, oxidation & water. Organisms such as plants have their roots penetrate the cracks in the rocks. As the roots grow and become bigger they put mechanical pressure on the rocks and the cracks increase in size and the rocks are split. Additionally, organisms secrete organic acids, as wastes, that chemically react with minerals in the rocks hence causing weathering.
Oxidation is a chemical reaction that changes the property of minerals by makes them prone to weathering. An example is the oxidation of iron in the rocks to iron III oxide which is brittle.
Water participates in chemical reaction by dissolving minerals, such as limestone (CaCO3) from the rock hence leaving the rock porous and more predisposed to physical weathering agents.
Answer:
Explanation:
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In this case, since the molar mass of the empirical formula is:
Thus, the ratio of the molecular to the empirical formula is:
Thus, the molecular formula is six times the empirical formula:
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Answer:
B pancreas, since the pancreas secretes insulin
Explanation:
Answer:
Explanation:
mass of the solution m = 1.6 + 75 = 76.6 g
fall in temperature = 25 - 23.34 = 1.66°C
heat absorbed = mass x specific heat x fall in temperature
= 76.6 x 1.66 x 4.18
= 531.5 J .
= .5315 kJ .
mol weight of ammonium nitrate = 80 g
heat absorbed by 1.6 g = .5315 kJ
heat absorbed by 80 g or one mole = 26.575 kJ
enthalpy change ΔH = +26.575 kJ
b )
enthalpy of hydration = 2630 kJ / mol
lattice energy = enthalpy of hydration + enthalpy change
= 2630 + 26.575
= 2656.575 kJ .
