This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
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Here are the answers to your questions: 4. A Step 1: Identify the nature of magnesium. Magnesium (Mg) is an alkaline earth metal. Step 2: Recall the properties of metal oxides. Oxides of metals are generally basic. They react with acids to form salt and water. For example, MgO + 2HCl → MgCl_2 + H_2O. Therefore, Magnesium oxide is an example of a basic oxide. 5. B Step 1: Understand fractional crystallization. Fractional crystallization is a method used to separate components of a mixture based on differences in their solubility. The substance that is less soluble will crystallize out first as the solution cools or the solvent evaporates. Step 2: Apply the given information. The problem states that NH_4Cl is more soluble than NaCl. This means NaCl is less soluble. Therefore, when separating the mixture by fractional crystallization, NaCl would crystallize first. 6. C Step 1: Analyze the trend of periodic properties across a period (from right to left). Electron affinity: Generally decreases from right to left across a period. Electronegativity: Generally decreases from right to left across a period. Atomic radius: Generally increases from right to left across a period because the number of electron shells remains the same, but the nuclear charge decreases, leading to less attraction on the outermost electrons. Ionization energy: Generally decreases from right to left across a period. Therefore, the periodic property that increases from right to left in the periodic table is Atomic radius. Last free one today — make it count tomorrow, or type /upgrade for unlimited.