Answer:
Cation present- Cr^3+
Cations absent- Al^3+,Fe^3+ and Ni^2+
Explanation:
The cations in group III are; Cr^3+,Al^3+,Fe^3+ and Ni^2+
The first step in the analysis of group III cations is the addition of sodium hypochlorite and sodium hydroxide. Chromium reacts as follows;
2Cr^3+(aq) + 3OCl^-(aq) + 10OH^-(aq) ---------> 2CrO4^2-(aq) + 3Cl^-(aq) + 5H2O(l)
In alkaline solution, Aluminum is separated from Chromium by precipitation. The yellow solution formed is unaffected by treatment with ammonia. However, in acid medium, a blue solution is formed which confirms the presence of Chromium III.
Atomic mass Ca = 40.078 u.m.a
40.078 g --------------- 6.02x10²³ atoms
121 g ------------------- ??
121 x ( 6.02x10²³) / 40.078 =
7.28x10²⁵ / 40.078 = 1.81x10²⁴ atoms
B ase from the reaction <span>cacn2 3 h2o → caco3 2 nh3, for every 1 mole of caco3 produced there 2 moles of nh3 being produced. to solved this, we must first convert the caco3 to moles.
mass nh3 = 187 g caco3 (1 mol caco3 / 100 g caco3 ) ( 2 mol nh3 / 1 mol caco3) ( 17 g nh3 / 1 mol nh3)
mass nh3 = 63.58 g nh3 is produced</span>
Answer:
semantics
Explanation:
Semantics is the study of the connection among words and how we draw significance from those words. Individuals can completely decipher words diversely and draw various implications from them.
Semantics implies the significance and translation of words, signs, and sentence structure. Semantics to a great extent decide our understanding cognizance, how we get others, and even what choices we make because of our translations. Semantics can likewise allude to the part of study inside phonetics that manages language and how we get meaning. This has been an especially intriguing field for philosophers as they banter the quintessence of importance, how we construct meaning, how we share significance with others, and how significance changes after some time.
It is possible to turn aldehydes and ketones into alkenes via the Wittig reaction.
<h3><u>What is wittig reaction ?</u></h3>
- The Wittig Reaction: It is possible to turn aldehydes and ketones into alkenes via the Wittig reaction, which is a practical process.
- Georg Wittig, its creator, received the 1979 Nobel Prize in Chemistry for it (along with the father of hydroboration, H.C. Brown).
- A carbonyl molecule (aldehydes and ketones both function, but esters or amides do not) and a fairly peculiar-looking species known as a ylide are the two ingredients in this reaction. (more precisely, a "phosphonium ylide," as there are also ylides of nitrogen and sulfur).
- An ylide is a species having opposing formal charges on nearby atoms, according to technical definition. The ylide, which we shown above with a double bond between carbon and phosphorus, also has a significant resonance form with a positive charge on phosphorus and a negative charge on carbon.
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