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Questions in chemistry

[Terjawab] A low-spin octahedral complex of Fe²⁺ with strong-field ligands will have VBT hybridization: A) sp³d² B) dsp² C) d²sp³ D) sp³

[Terjawab] Chemical erasures of words or numbers may be revealed by examination of handwriting under A. x-ray fluorescence B. gamma radiation C. infrared light D. visible light

[Terjawab] (b) (i) State a reason for each of the following: I. The lid of a desiccator should be made air-tight by greasing. II. The milkiness of lime water disappears when excess carbon (IV) oxide is passed into it. (ii) Write a chemical equation for (b)(i) II. (iii) Name two gases that can be used for the fountain experiment.

[Terjawab] Give the IUPAC nomenclature of the following: I. [tex]CH _3( CH _2)_5 CHC ( CH _3) C ( CH _3)_3[/tex] II. Ethyl methaneate Trans - 2,3-dimethyl had - 2 ene III. [tex]Cl ( CH _3)_2 CH _2 CHCHCHCCl ) CH _3[/tex]

[Terjawab] What does a pH of 7 say about a solution? A. The solution is acidic. B. The solution is at equilibrium. C. The solution is basic. D. The solution is neutral.

[Terjawab] Lexi is balancing equations. She is finding one equation to be very difficult to balance: [tex]ZnSO _4+ Li _2 CO _3 \rightarrow ZnCO _3+ Li _2 SO _4[/tex] A. One reactant and one product needs the coefficient 2. B. The products both need a 3 coefficient. C. The reactants both need a 2 coefficient. D. Atoms in the equation are already in balance.

[Terjawab] Type the correct answer in the box. Express your answer to two significant figures. You are performing a reaction with 1.7 moles of hydroiodic acid and 3.43 moles of zinc bromide: [tex]2 HI+ZnBr_2 \rightarrow 2 HBr+ZnI_2[/tex] How many moles of zinc iodide can be made? The theoretical yield is $\square$ moles of zinc iodide.

[Terjawab] Choose the net ionic equation for the formation of the product in Step 5. Select the best answer. $Mg ^{2+}(a q)+2 NH _4^{+}(a q) \rightarrow Mg \left( NH _4\right)_2(s)$ $Mg \left( NO _3\right)_2(a q)+\left( NH _4\right)_2 C _2 O _4(a q) \rightarrow MgC _2 O _4(s)+2 NH _4 NO _3(a q)$ $Mg \left( NO _3\right)_2(a q)+\left( NH _4\right)_2 C _2 O _4(a q) \rightarrow MgC _2 O _4(s)+\left( NH _4\right)_2\left( NO _3\right)_2(a q)$ $Ca \left( NO _3\right)_2(a q)+\left( NH _4\right)_2 C _2 O _4(a q) \rightarrow CaC _2 O _4(s)+\left( NH _4\right)_2\left( NO _3\right)_2(a q)$ $Mg ^{2+}(a q)+ C _2 O _4{ }^{2 \cdot}(a q) \rightarrow MgC _2 O _4(s)$ $Ca ^{2+}(a q)+ C _2 O _4^{2 \cdot}(a q) \rightarrow CaC _2 O _4(s)$ $Ca \left( NO _3\right)_2(a q)+\left( NH _4\right)_2 C _2 O _4(a q) \rightarrow CaC _2 O _4(s)+2 NH _4 NO _3(a q)$ $Ca ^{2+}(a q)+2 NH _4{ }^{+}(a q) \rightarrow Ca \left( NH _4\right)_2(s)$

[Terjawab] Select all the correct answers. Which acids have hydro- as part of their name? $H _2 SO _3$ HBr $HClO _2$ HF $HNO _3$

[Terjawab] How many grams of potassium carbonate are needed to make 400.0 mL of 2.5 M solution? $K_2 CO_3: 138.21 g / mol$ A. $140,000 g K _{-} CO _3$ B. $86 g K _2 CO _3$ C. $140 g K = CO _3$ D. $21 g K _2 CO _3$