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Questions in chemistry

📝 Answered - X and Y are oxides of elements of Period 3 of the Periodic Table. If one mole of X is added into water, the solution produced is neutralised by one mole of Y. Which oxides are represented by X and Y? X | Y ---|--- A | SO3 | Al2O3 B | P4O10 | Na2O C | SO3 | Na2O D | P4O10 | Al2O3

📝 Answered - Which pair shares the same empirical formula? A. [tex]$C _2 H _4$[/tex] and [tex]$C _6 H _6$[/tex] B. [tex]$CH _2$[/tex] and [tex]$CH _4$[/tex] C. [tex]$CH _3$[/tex] and [tex]$C _2 H _6$[/tex] D. CH and [tex]$C _2 H _4$[/tex]

📝 Answered - Select from the response list the compound or ion that best fits the description: conjugate base of [tex]$H _3 PO _4$[/tex]. [tex]$PO _4^{3-}$[/tex] [tex]$HPO _4{ }^{2-}$[/tex] [tex]$H _3 PO _4$[/tex] [tex]$H _2 PO _4^{-}$[/tex]

📝 Answered - Using the phase diagram for [tex]H _2 O[/tex], what phase is water in at 1 atm pressure and [tex]$-5^{\circ} C$[/tex]? A. It is at its melting point. B. It is in the gas phase. C. It is in the liquid phase. D. It is in the solid phase.

📝 Answered - Which of the following equations represents an acid-base neutralization reaction? [tex]$H _2 SO _4+ Zn \rightarrow ZnSO _4+ H _2$[/tex] [tex]$HNO _3+ KOH \rightarrow KNO _3+ H _2 O$[/tex] no correct response more than one correct response [tex]$Ba ( OH )_2+ Na _2 SO _4 \rightarrow BaSO _4+2 NaOH$[/tex]

📝 Answered - Which statement would be the most useful for deriving the ideal gas law? A. Volume is directly proportional to the number of moles. B. Volume is inversely proportional to the temperature. C. Pressure is directly proportional to the volume. D. Pressure is inversely proportional to the number of moles.

📝 Answered - What is revealed in the reaction $Ca ( OH )_2(s) \rightarrow Ca ^{2+}(a q)+$ $2 OH ^{-}(a q)$, $\Delta H =-16.71 ?$ A. Heat is one of the reactants. B. The reaction occurs slowly. C. The reaction is endothermic. D. The reaction produces heat.

📝 Answered - A change in which factor will affect the rate of reaction only when gases are involved? A. temperature B. pressure C. surface area

📝 Answered - Which of the following compounds spontaneously hydrolyze to give alcohol? 1. CH3-C=CH2 2. CH2=CH2 3. (CH3)3C-CH=CH2 4. Benzene ring-CH2-CH=CH2

📝 Answered - Practice exercise 1 1. Convert the following masses into kilograms. a) 58 475 μg b) 406 dg c) 1 900 cg d) 945 Dg e) 1 854 mg f) 23 tonnes