Water can contain dilute chemical solutions that can dissolve rock, such as hydrochloric acid (HCl) working against limestone (CaCO3). Chemical weathering.
<span>(2) Water can carry physical particles of small grains, and when it runs across another rock, this acts like a natural sandpaper. Most river systems are carved this way. </span>
<span>(3) Liquid water can slip into cracks and fissures of rocks, really big rocks, and then when the temperature falls below freezing, the liquid water turns to ice. When this happens, the water expands by about 8% of its original volume, causing a "pushing" force outward on the rock. Over time, this freeze-thaw-freeze-thaw pumping will slowly break off chunks of rock as mass wasting (rockfalls).</span>
From the information provided in the question, we can see that; the electron moved up to an energy level and has an energy of 21.72 x 10-19 J.
Bohr's model of the atom tells us that electrons are found in certain specific energy levels. Energy is absorbed when an electron moves from a lower to a higher energy level and energy is released when an electron moves from a higher to a lower energy level.
Given that;
ΔE = E2 - E1
E2 = final energy level
E1 = initial energy level
E2 = ?
E1 = 16.32 x 10-19 J
ΔE = 5.4 x 10-19
E2 = ΔE + E1
E2 = 5.4 x 10-19 + 16.32 x 10-19 J
E2 = 21.72 x 10-19 J
Learn more: brainly.com/question/4612545
The paleoatmosphere refers to the Earth’s atmosphere
in the geological past. The paleoatmosphere was dominated by nitrogen, carbon
dioxide and methane. These gases are generated by the radioactive decay of
Potassium. During this pre-biological atmosphere, it is thought to have been
reducing, to have highly contained virtually no free oxygen, and virtually no
argon. Therefore the major gases on this period are the Nitrogen and Carbon Dioxide.
Answer:
D. a positive ion and a negative ion
Explanation:
Ionic bonds is formed from the attraction of opposite full charges. So a positive ion and a negative ion will make a ionic bond (Similar to how Na+ and Cl- ions make salt - which is basically a crystal of ions bonded via ionic bonds)
V = 500ml = 0,5 l
c = 0,75 M
c = n/V
n = c × V
n = 0,75 × 0,5 = 0,375[mol]
M NaCl = 58,5 g/mol
1 mol ------- 58,5 g
0,375 mol ----- x g
x = 0,375 mol × 58,5 g / 1 mol = 21,94 g
Answer: In this solution there are 21,94 g of sodium chloride.
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