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Questions in chemistry

[Homework Help] 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

[Homework Help] 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]

[Homework Help] 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]

[Homework Help] 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.

[Homework Help] 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]

[Homework Help] 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.

[Homework Help] 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.

[Homework Help] A change in which factor will affect the rate of reaction only when gases are involved? A. temperature B. pressure C. surface area

[Homework Help] 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

[Homework Help] 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