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Hogar Banco de preguntas Química Archive 2024 December 24

Chemistry Questions from Dec 24,2024

Browse the Chemistry Q&A Archive for Dec 24,2024, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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[3-520] The \( \mathrm{p}^{\mathrm{H}} \) value of a certain solution may vary by all the following, except..... a) adding acid or base to the solution. b) adding an extra amount from the same solution. c) evaporating a part of water (solvent) by heating without changing the amount of solute. [3-441] Hydrocyanic acid is one of the weak acids which is incompletely ionized, and its ionization is according to the following equation: \[ \mathrm{HCN}_{(\mathrm{aq})}+\mathrm{H}_{2} \mathrm{O}_{(\mathrm{l})} \rightleftharpoons \mathrm{H}_{3} \mathrm{O}^{+}(\mathrm{aq})+\mathrm{CN}^{-}(\mathrm{aq}) \] On adding drops of \( \mathrm{H}_{2} \mathrm{SO}_{4} \) solution: the concentration of \( \mathrm{CN}^{-} \)will ..... and on adding drops of KOH solution: the concentration of \( \mathrm{CN}^{-} \)will ...... [3-692] A flask contains a sample of hydrated iron III chloride was heated strongly; if you know that the mas: of the hydrated salt in the flask is 10.7275 g and the mass of the flask empty is 9.375 g and the mass of the salt in the flask after heating is 10.1875 g , so the chemical formula of this salt is ................... [3-650] Find the volume of boric acid \( \mathrm{H}_{3} \mathrm{BO}_{3} \) with a given concentration, that neutralizes with \( \frac{3}{4} \) liter NaOH which has half a concentration of acid A) 24,8 31. \( 49 \% 300 \mathrm{~g} \) sulfat kislota eritmasida 120 g. sulfat angdrid eritilishidan hosil bo lgan eritmadagi kislotaning foiz konsentratsiyasin aniqlang. \( \begin{array}{ll}\text { A) } 58,8 & \text { B) } 38\end{array} \) рассчитывается эта величина? 2. Рассчитайте массовые доли элементов в веществах: а) углекислом газе \( \mathrm{CO}_{2} \); б) сульфиде кальция \( \mathrm{CaS} ; \) в) натриевой селитре \( \mathrm{NaNO}_{3} \); г) оксиде алюминия \( \mathrm{Al}_{2} \mathrm{O}_{3} \). 3. B каком из азотных удобрений массовая доля питательного элемен- та азота наибольшая: а) хлориде аммония \( \mathrm{NH}_{4} \mathrm{Cl} \); б) сульфате аммо- ния \( \left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4} \); в) мочевине \( \left(\mathrm{NH}_{2}\right)_{2} \mathrm{CO} \) ? 6,5 gram asetilenin \( \mathrm{NH}_{3} \) lü \( \mathrm{CuNO}_{3} \) çäzeltisi ile tam verimli tepkimesi sonucu kaç gram çökelek \( \left(\mathrm{Cu}_{2} \mathrm{C}_{2}\right) \) oluşur? \( (\mathrm{Cu}=64, \mathrm{C}=12, \mathrm{H}=1) \) 520 gram asetilen elde edebilmek için kütlece \( \% 40 \) saflıkta- ki karpit \( \left(\mathrm{CaC}_{2}\right) \) in en az kaç gramı suyla tepkimeye girme- lidir? \( (\mathrm{H}=1, \mathrm{C}=12, \mathrm{O}=16) \) In an atom, the atomic number always represents the number of \( \square \) In an electrically neural atom, this, \( \begin{array}{l}\text { represents the number of } \square \text { electron while non-metals tend to } \\ \text { electrons. An atom that loses electrons is called a } \square \text { and has a } \square \text { charge. }\end{array} \) An atom that gains electrons is called an \( \square \square \) and has a \( \square \) chars,
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