How many moles are in 4 grams of H
What is the difference between Mars and Venus? B.Mars' atmosphere is thick and Venus' atmosphere is thin C.Mars' atmosphere is thin and Venus' atmosphere is thick D.Mars is cold and Venus is hot Mars is hot and Venus is cold E.Both B and C
How are elements organized in the periodic table
What is the central conflict in "Ellen foster"?
major conflict. Ellen continually suffers abuse by her neglectful caretakers and searches for a stable home and loving family. rising action. Ellen is placed in a number of temporary homes, all of which are unhappy, and she longs for a home where she is loved and cared for.
The principle stating that geological processes taking place on Earth today are the same as those of the past and can be used to describe geological events.
The principle of uniformitarianism describes the fact that the geological processes used to occur in the past were in the same manner and with the same intensity that as they occur in the present on the planet Earth. Therefore, uniformity in the geological processes exhibit from the unknown and unobservable past to present scenario of Earth. The present is the key to the past is the slogan of the principle of uniformitarianism.
What happens to water as it boils? A. The intermolecular forces strengthen and lock the molecules in
B. The average kinetic energy of the molecules increases as energy
C. The energy that is absorbed overcomes the intermolecular forces
that hold the molecules together. I
D. The average kinetic energy of the molecules decreases as energy
A process called gaseous diffusion is often used to separate isotopes of uranium-that is
Answer:uranium-235 (²³⁵U) and uranium-238 (²³⁸U)
The gaseous diffusion process utilizes uranium hexafluoride, UF₆, because although it is a solid at room temperature it is easily vaporized.  UF6 is not only convenient for its volatility, but also due to the fact that fluorine only consists of the isotope ¹⁹F, meaning the difference in molecular weights for UF6 are purely reliant on 235U and 238U.Here arises another problem however, for the masses of the two uranium isotopes are so nearly equal there is very little separation of 235UF6 and 238UF6 with one pass through a diffuser.Therefore a cascade process is needed to obtain any measurable amount of enrichment. In a cascade the feed stream at diffuser 1 is the UF6 prior to enrichment (meaning it will contain 0.711% 235U and 99.289% 238U) and marks the start of the cascade. There will be hundreds to thousands of diffusers on the upward or enriching side as well as on the downward or depleted side. The slightly enriched UF6 is sent up the cascade process to the next diffuser where it will be enriched again. The slightly depleted UF6 will be sent downward through the cascade where it will also be enriched again. In this way, the enriched uranium keeps getting enriched and sent onward, and the depleted uranium also gets enriched and sent onward. The depleted uranium always gets sent downward where it will eventually be ejected from the downward stream as depleted uranium.
Novelty devices for predicting rain contain colbalt chloride and are based on the following equilibrium: CoCl2(s) + 6H2O(g) = CoCl2 . 6H2O(s)
First part of equilibrium is Purple
Second part of equilibrium is Pink
What color will such an indicator be if rain is imminent?
In the reaction, in the left part we have two species to react, but it is not reacting yet. While the right part of the reaction, we have one specie that is the product of the addition of two differents species.
The CoCl2 when is dry (anhydrus) the apparence is a purple-blue fine powder, while it chemical absorbs water (wold be wet) the apparence is a pink coarse powder.
I hope you undersant
What is the STM in science