4) Apagıda varilen maddalarden hangisi suda çö- zöndogonda oriamda bulunan H' iyon derişimini artırir? \( \begin{array}{ll}\text { A) } \mathrm{KOH} & \text { B) } \mathrm{NH}_{3} \\ \text { C) } \mathrm{H}_{2} \mathrm{SO}_{4} & \text { () } \mathrm{KNO}_{3}\end{array} \)

\begin{tabular}{l} Physical vs. Chemical \\ 5) Click all of the boxes that are physical properties of iron. * \\ Iron corrodes in moist air. \\ Density of iron is \( 7.84 \mathrm{~g} / \mathrm{mL} \). \\ Iron is soft when pure. \\ Iron melts at 1538C \\ 6) Is grilling meat during a cookout an example of a physical change or \\ chemical change? Explain your thinking. \\ Your answer 2 points \\ \hline Back \\ Next \end{tabular}

[3-441] Hydrocyanic acid is one of the weak acids which is incompletely ionized, and its ionization is according to the following equation: \[ \mathrm{HCN}_{(\mathrm{aq})}+\mathrm{H}_{2} \mathrm{O}_{(0)} \rightleftharpoons \mathrm{H}_{3} \mathrm{O}^{+}(\mathrm{aq})+\mathrm{CN}^{-}(\mathrm{aq}) \] 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 ...... a) decreases, increases b) increases, increases c) increases, decreases d) decreases, decreases

14-35 When a rod of zinc metal dipped in 1 molar solution copper II sulphate, all the following happen except. \( [\mathrm{Zn}=65, \mathrm{Cu}=63.5] \) zinc rod is kept electrically neutral \& also the solution is kept electrically neutral [ \( \left.\mathrm{SO}_{4}{ }^{2}\right] \) is kept constant in the solution the mass of rod is kept constant

\begin{tabular}{l} art 3: Pure Air \( \left(\mathrm{N}_{2}+\mathrm{O}_{2}+\mathrm{CO}_{2}\right) \) is a homogeneous mixture. Is polluted air also a homogeneous mixture or is it \\ heterogeneous mixture? Explain your thinking in CER format. Use complete sentences in each part of the \\ CER format. \\ \begin{tabular}{l|l|l|} Claim: What type of \\ mixture is polluted city air? \end{tabular} \\ \hline \( \begin{array}{l}\text { Evidence: What is the } \\ \text { chemical formula for pure } \\ \text { air? List speciic evidence } \\ \text { that you see of polluted city } \\ \text { air from the slides. }\end{array} \) \\ \hline \begin{tabular}{|l|l|}\hline Reasoning: Connect your & \\ evidence back to your \\ claim. How does your \\ evidence support your \\ claim? \end{tabular} \\ \hline\end{tabular}

QuEsTION (a) Write the product(s) in the followins reactions: CH3 (i) \( \mathrm{CH}_{3}-\mathrm{CH}-\mathrm{O}-\mathrm{CH}_{2}-\mathrm{CH}_{3} \xrightarrow{\mathrm{HH}_{3}} \) ? + ?