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Questions in chemistry

📝 Answered - Given the balanced equation representing a reaction: \[ \text{Al}_2(\text{SO}_4)_3 + 6\text{NaOH} \rightarrow 2\text{Al(OH)}_3 + 3\text{Na}_2\text{SO}_4 \] The mole ratio of NaOH to Al(OH)3 is: 1. 1:1 2. 3:1 3. 1:3 4. 3:7

📝 Answered - When lithium reacts with bromine to form the compound LiBr, each lithium atom 1. gains one electron and becomes a negatively charged ion 2. gains three electrons and becomes a negatively charged ion 3. loses one electron and becomes a positively charged ion 4. loses three electrons and becomes a positively charged ion

📝 Answered - Which compound is an electrolyte? 1. CH₃CHO 2. CH₃OCH₃ 3. CH₃COOH 4. CH₃CH₂CH₃

📝 Answered - Given the balanced equation representing the reaction: \[ \text{N}_2 + \text{energy} \rightarrow \text{N} + \text{N} \] Which statement describes this reaction? A. Bonds are broken, and the reaction is endothermic. B. Bonds are broken, and the reaction is exothermic. C. Bonds are formed, and the reaction is endothermic. D. Bonds are formed, and the reaction is exothermic.

📝 Answered - Given the balanced equation representing a reaction: \[ 4Al(s) + 3O_2(g) \rightarrow 2Al_2O_3(s) \] As the aluminum loses 12 moles of electrons, the oxygen: (1) gains 4 moles of electrons (2) gains 12 moles of electrons (3) loses 4 moles of electrons (4) loses 12 moles of electrons

📝 Answered - Which element has atoms with the strongest attraction for electrons in a chemical bond? 1. Chlorine 2. Nitrogen 3. Fluorine 4. Oxygen

📝 Answered - Which reaction is single replacement? 1. [tex]2H_2O_2 \rightarrow 2H_2O + O_2[/tex] 2. [tex]2H_2 + O_2 \rightarrow 2H_2O[/tex] 3. [tex]H_2SO_4 + Mg \rightarrow H_2 + MgSO_4[/tex] 4. [tex]HCl + KOH \rightarrow KCl + H_2O[/tex]

📝 Answered - Which terms identify types of chemical reactions? A. decomposition and sublimation B. decomposition and synthesis C. deposition and sublimation D. deposition and synthesis

📝 Answered - Which property is a measure of the average kinetic energy of the particles in a sample of matter? 1. mass 2. density 3. pressure 4. temperature

📝 Answered - Which polyatomic ion is found in the compound represented by the formula [tex]$NaHCO_3$[/tex]? A. acetate B. hydrogen carbonate C. hydrogen sulfate D. oxalate