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Home Question Bank Chemistry Archive 2025 January 10

Chemistry Questions from Jan 10,2025

Browse the Chemistry Q&A Archive for Jan 10,2025, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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[3-5511 Knowing that the ionic product of water is changed loy the change of temperature, and under certain conditions from temperature it's found that \( K_{w}=2.7 \times 10^{-14} \). So, the P \( { }^{\text {H }} \) value for water in this state equals: a) 5.65 b) 7 c) 7.13 d) 6.78 【3-5A1] Study the following equilibrium \( A+2 B \rightleftharpoons 4 C_{p} \Delta H= \) \( +123 K J \). \( K_{c}=2.5 \) at \( 100^{\circ} \mathrm{C} \), so \( K_{c} \) for: \( \angle C \rightleftharpoons A * 2 B \) at \( 200^{\circ} \mathrm{C} \) equals a) 0.4 b) 0.25 c) 0.6 d) 2.5 [3-531] What happens to the poH value of HCl solution volhen ammonia solution is added to it? a) It will be decreased. b) It will be increased. d) It will remain constant. d) Can not be determined. [3-521] The acid at which contains the highest concentration of OH- is .......... (knowing that all of them have the same concentration). a) HCl b) \( H A\left(K_{\mathrm{a}}=1.5 \times 10^{-4}\right) \) c) \( H B\left(K_{\mathrm{a}}=1 \times 10^{-6}\right) \) d) \( H C\left(K_{\mathrm{a}}=2.4 \times 10^{-4}\right) \) \begin{tabular}{l} 【3-51 1] 1 L of HCl acid its \( p^{\mathrm{H}} \) value =1 was added to 1L \\ of NaOH its \( p^{\mathrm{H}} \) value \( =11 \). \\ What is \( p^{\mathrm{H}} \) value of that mixture? \\ a) 0.996 \\ \( \begin{array}{l}\text { b) } 2 \\ \text { c) } 1.3 \\ \text { d) } 1.703 \\ \text { Type here to search }\end{array} \) \\ \hline\end{tabular} 1) Locate the circled RSq molecule in model 1 . a) Find a second RSq molecule and place a red circle around it. b) How many atoms are in a molecule of RSq ? 2) Find and circle a molecule of \( \mathrm{TSq}_{2} \mathrm{R} \) in Model 1 . a) How many different types of atoms are found in a molecule of \( \mathrm{TSq}_{2} \mathrm{R} \) ? b) How many Sq atoms are in a molecule of \( \mathrm{TSq}_{2} \mathrm{R} \) ? spuesta final, incluir claramente los despejes utilizados. Lo anterior para que sur calcule la concentración molar de una disolución de NaOH si 11.5 mL de la disolución son necesarios para cerrar oresaltar con color diferente la o las respuestas solicitadas. neutralizar 10 mL de HCl al 0.503 M . (4 puntos) n. 4) A 50 mg sample of lodine decays to 23 mg after 12 days. a) Determine the half life of lodine. b) How long will it take for the sample to decay to \( 10 \% \) of the original amount? 3) Hydroxide of Metal \( X \) which is slightly soluble in water and its pH value is 9 and it olubility degree is \( 3.33 \times 10^{-6} \), so the formula of the compound may be: \( \begin{array}{llll}X O H & \text { b) } X(O H)_{2} & \text { c) } X(O H)_{4} & \text { d) } X(O H)_{3}\end{array} \) 27) If the percentage of potassium hydroxide in a mixture of mass 0.5 g of potassium chloride and potassium hydroxide is \( 80 \% \), then the volume of hydrochloric acid solut of concentration 0.2 required for neutralization is: \( (K=39,0=16, H=1) \) \( \begin{array}{llll}\text { a) } 0.0355 \mathrm{ml} & \text { b) } 35.7 \mathrm{ml} & \text { c) } 35.7 \mathrm{~L} & \text { d) } 0.0071\end{array} \)
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