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Questions in chemistry

[Terjawab] Give any example of preparation of bis-arene by Fischer aluminium reduction method?

[Terjawab] Which ionic compound is used as a building material? A. salt B. limestone C. magnesium oxide D. iron oxide

[Terjawab] Nitrogen dioxide, $NO _2(g)$ ( $\triangle H_{ t }=33.84 kJ / mol$ ), is decomposed according to the following reaction: $2 NO_2(g) \rightarrow N_2(g)+2 O_2(g)$ What is the enthalpy change when 2.50 mol of nitrogen dioxide decomposes? Use $\Delta H_{p x D}=\sum(\Delta H_{\text {f, products }})-\sum(\Delta H_{f, \text { reactants }})$. A. 13.5 kJ of energy released B. 13.5 kJ of energy absorbed C. 84.6 kJ of energy released D. 84.6 kJ of energy absorbed

[Terjawab] Match the following: 12. Column-I (a) Ideal gas law (b) Avogadro gas law (c) Boyle's temperature (d) 22.7 L at STP Column-II (p) V ∝ n (q) PV = nRT (r) Molar volume of ideal gas (s) Gas follows ideal gas equation 13. Column-I (a) Ideal gas isotherm (b) Ideal gas Temp is increased by (c) Real gases deviate from ideal gases (d) 2 Mol of ideal gas at 540 K is 44.8 L, its P is Column-II (p) Plot of V at const T (q) Increasing P and M and V constant (r) because of attraction of molecules (s) 2 atm

[Terjawab] Which substances have [tex]$\Delta H_{ f }=0 kJ / mol$[/tex] by definition? Select all that apply. [tex]$O _2(g)$[/tex] [tex]$N ( g )$[/tex] [tex]$H _2 O ( l )$[/tex] [tex]$Br _2( I )$[/tex] Fe(s) He(g)

[Terjawab] Compound Table Activity Find 10 items at home that you think are either elements or compounds. In the first column titled "Item Picture", write or draw the item (e.g., salt, water, iron, oxygen, etc.). In the second column titled "Element or Compound?", identify whether the item is an element (like gold, oxygen, iron) or a compound (like water, sugar, vinegar). In the third column titled "Reason", explain why you identified the item as an element or compound. Example: Water - Compound – It is made of hydrogen and oxygen. Iron - Element - It is made of only one type of atom.

[Terjawab] Use the electronegativity values given to answer the following: Electronegativity values: [tex]$C =2.5, H =2.1, N=3.0, O =3.5, Cl =3.0$[/tex] For each bond below: a) Determine the electronegativity difference b) State the bond type (ionic, polar covalent, or non-polar covalent) c) Predict whether the molecule is polar or non-polar (assume correct geometry) | Molecule | [tex]$\Delta EN$[/tex] | Bond Type | Molecule Polarity | |----------|------------------|-----------|-------------------| | [tex]$H - Cl$[/tex] | | | | | [tex]$C - H$[/tex] | | | | | [tex]$N - H$[/tex] | | | | | [tex]$O - H$[/tex] | | | |

[Terjawab] Use the periodic table to complete this equation that represents nuclear fission processes. ${ }_{92}^{275} U+{ }_0^1 n \rightarrow{ }_{50}^{139} Ba+{ }_8^1 C+3{ }_0^1 n$ A: $\square$ B: $\square$ C: $\square$

[Terjawab] Select all the correct locations on the image. Which elements are diatomic? \begin{tabular}{|c|c|} \hline 1 & \\ \hline H & \\ \hline 3 & 4 \\ Li & Be \\ \hline 11 & 12 \\ Na & Mg \\ \hline 19 & 20 \\ K & Ca \\ \hline 37 & 38 \\ Rb & Sr \\ \hline 55 & 56 \\ Cs & Ba \\ \hline 87 & 88 \\ Fr & Ra \\ \hline \end{tabular} \begin{tabular}{|c|c|c|c|c|c|} \multicolumn{7}{c|}{} & \multicolumn{1}{c|}{4} & \multicolumn{1}{c|}{ He } \\ \hline B & 6 & 7 & 8 & 9 & 10 \\ B & C & N & O & F & Ne \\ \hline 13 & 14 & 15 & 16 & 17 & 18 \\ Al & Si & P & S & Cl & Ar \\ \hline 31 & 32 & 33 & 34 & 35 & 36 \\ Ga & Ge & As & Se & Br & Kr \\ \hline 49 & 50 & 51 & 52 & 53 & 54 \\ In & Sn & Sb & Te & I & Xe \\ \hline 81 & 82 & 83 & 84 & 85 & 86 \\ TI & Pb & Bi & Po & At & Rn \\ \hline 113 & 114 & 115 & 116 & 117 & 118 \\ Nh & FI & Mc & Lv & Ts & Og \\ \hline \end{tabular}

[Terjawab] 4. Define the following in one sentence or two: (a) Compound (b) Crystallization (c) Decantation (d) Distillation (e) Filtration 5. Match the type of mixture in Column A with the correct examples in Column B Column A (a) Gas in gas (b) Gas in liquid (c) Liquid in liquid (d) Solid in liquid (e) Solid in solid (f) Solid in gas Column B (i) Smoke (ii) Soil (iii) Sea water (iv) Lemon juice in water (v) Aerated water (soda) (vi) Air