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Questions in chemistry

[Solved] 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.

[Solved] 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.

[Solved] 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.

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

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

[Solved] 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. $21 g K _2 CO _3$

[Solved] Constants for water |$\Delta H _{\text {vap }}$ | $40.65 kJ / mol$ | |---|---| |$\Delta H _{ f }$ | $-285.83 kJ / mol$ | |$\Delta H _{\text {fusion }}$ | $6.03 kJ / mol$ | | specific heat | $4.186 J / g ^{\circ} C$ | | molar mass | 18.02 g | How much energy is consumed by thawing 4.3 g ice? A. $4.3 g \times 1 mol / 18.02 g \times 40.65 kJ / mol$ B. $4.3 g \times 1 mol / 18.02 g \times 4.186 kJ / mol$ C. $4.3 g \times 1 mol / 18.02 g \times 6.03 kJ / mol$ D. $4.3 g \times 1 mol / 18.02 g \times(-285.83) kJ / mol$

[Solved] Based on the information in the table, which two elements are most likely in the same group, and why? | Element | Atomic mass (amu) | Total electrons | Valence electrons | Year isolated | |---|---|---|---|---| | Bismuth (Bi) | 209 | 83 | 5 | 1753 | | Nitrogen (N) | 14 | 7 | 5 | 1772 | | Oxygen (O) | 16 | 8 | 6 | 1772 | | Sodium (Na) | 23 | 11 | 1 | 1807 | | Thallium (TI) | 204 | 81 | 3 | 1861 | A. bismuth and thallium, because their atomic masses are very similar B. nitrogen and oxygen, because they were both first isolated in the same year C. sodium and thallium, because their names both end in the same suffix: -ium D. bismuth and nitrogen, because they have the same number of valence electrons

[Solved] Which of the following ions exhibits the highest magnetic moment? (a) Fe²⁺ (b) Mn²⁺ (c) Cu²⁺ (d) Co²⁺

[Solved] Table 1 shows the electron arrangement for elements W, X, Y, and Z. | Element | Electron Arrangement | |---------|---------------------| | W | 2.4 | | X | 2.8 | | Y | 2.8.2 | | Z | 2.8.7 | Which element is a metal? A) W B) X C) Y D) Z