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Questions in chemistry

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

[Terjawab] What would happen if [tex]$N _2$[/tex] were added to [tex]$N _2(g)+ O _2(g)=2 NO (g)$[/tex] at equilibrium? A. More [tex]$O _2$[/tex] and NO would form. B. [tex]$K$[/tex]eq would decrease. C. More [tex]$N _2$[/tex] and [tex]$O _2$[/tex] would form. D. More NO would form.

[Terjawab] Which is responsible for the formation of ozone in the upper atmosphere? A. gamma radiation B. volatile organic compounds C. ultraviolet radiation D. infrared radiation E. chlorofluorocarbons

[Terjawab] Decide whether the molecules represented by the following formulas are polar or nonpolar. (You may need to draw Lewis structures and geometric sketches to do so.) 1. OF₂ 2. CH₂Cl₂ 3. HCN 4. SO₂ 5. CH₄

[Terjawab] What is the conjugate acid in the following reaction: [tex]$HCl ( aq )+$[/tex] [tex]$H _2 O ( i ) \rightarrow Cl ^{-}( aq )+ H _3 O ^{+}( aq ) ?$[/tex] A. [tex]$H _2 O$[/tex] B. [tex]$Cl ^{-}$[/tex] C. [tex]$H _3 O ^{+}$[/tex]

[Terjawab] Consider this reaction: $KOH + HBr \rightarrow KBr + H _2 O$ Which is the base in this reaction? A. KOH B. HBr C. KBr D. $H _2 O$

[Terjawab] Calcium carbonate reacts with HCl to give CaCl₂ and CO₂ according to the reaction: CaCO₃(s) + 2HCl(aq) → CaCl₂(aq) + CO₂(g) + H₂O(l) What mass of 20% impure CaCO₃ is required to react completely with 250 ml of 0.50 M HCl? (1) 6.25 g (2) 5 g (3) 4.75 g (4) 7.8 g

[Terjawab] A student prepares 150.0 mL of 1.40 M HCl using 35.0 mL of a stock solution. What is the concentration of the stock solution?

[Terjawab] What else is produced during the replacement reaction of silver nitrate? [tex]2 AgNO_3+K_2 SO_4 \rightarrow Ag_2 SO_4+ KNO _3[/tex] A. [tex]2 KNO _3[/tex] B. [tex]K _2[/tex] C. [tex]2 AgNO _3[/tex]

[Terjawab] How can the effect of heat on a reaction be determined? A. Heat always shifts a reaction toward reactant formation. B. Heat is treated as a reactant or a product. C. Heat will increase reaction rate, but not equilibrium position. D. Heat always shifts a reaction toward product formation.