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Questions in chemistry

[Terjawab] What is the hydronium ion $[H_3 O^+]$ concentration for a $6.42 \times 10^{-9} M [OH^-]$ solution?

[Terjawab] Materials | | Visible | Not Visible | Uniform | NonUniform | State of Matter | |-----------|---------|-------------|---------|------------|-----------------| | 1. Sugar and water | | | | | | | 2. Oil and water | | | | | | | 3. Vinegar and water | | | | | | | 4. Salt and pepper | | | | | | | 5. leaf and water | | | | | |

[Terjawab] Consider the reaction below. [tex]PCl_5(g) \longleftrightarrow PCl_3(g)+Cl_2(g)[/tex] At 500 K, the reaction is at equilibrium with the following concentrations. [tex] \begin{array}{l} \left.PCl_5\right]=0.0095 M \\ \left.PCl_3\right]=0.020 \\ \left.Cl_2\right]=0.020 M \end{array} [/tex] What is the equilibrium constant for the given reaction?

[Terjawab] Label A-F based on the table using C for concentrated and D for dilute. A $\square$ F B $\square$ C $\square$ D $\square$ E $\square$ F $\square$ | acid/base | molarity | concentrated/dilute | |---|---|---| | HCI | 12 M | A | | | 0.5 M | B | | NaOH | 0.01 M | C | | | 6.0 M | D | | $H _2 SO _4$ | 0.05 M | E | | | 10 M | F |

[Terjawab] Which formula equation shows a reversible reaction? [tex]2 Na + F _2 \rightarrow 2 NaF[/tex] [tex]CaCO _3 \rightarrow CaO + CO _2[/tex] [tex]NH _4 Cl ( s ) \leftrightarrow NH _3(g)+ HCl ( g )[/tex] [tex]2 H _2 O _2( aq ) \xrightarrow{ Br } 2 H _2 O ( l )+ O _2(g)[/tex]

[Terjawab] Type the correct answer in the box. Some fertilizer blends contain magnesium nitrate $\left( Mg _{\left( NO _3\right)_2}\right)$. Suppose that a chemist has 1.24 liters of a 2.13 M solution of magnesium nitrate. If the chemist dilutes the solution to 1.60 M, what is the volume of the new solution? Express your answer to three significant figures. The volume of the new solution is $\square$ liters.

[Terjawab] Find the number of molecules that are planar: (i) SF₄ (ii) XeF₆ (iii) XeF₂ (iv) XeF₄ (v) H₂O (vi) NH₃ (vii) PH₃ (viii) PCl₅ (ix) PCl₃

[Terjawab] What is the formula equation for the reaction between sulfuric acid and dissolved sodium hydroxide if all products and reactants are in the aqueous or liquid phase? [tex]$HCl ( aq )+ NaOH ( aq ) \rightarrow NaCl ( s )+ H _2 O ( l )$[/tex] [tex]$H _2 SO _4( aq )+ Ca ( OH )_2( aq ) \rightarrow CaSO _4( aq )+2 H _2 O ( l )$[/tex] [tex]$H _2 SO _4( aq )+2 NaOH ( aq ) \rightarrow Na _2 SO _4( aq )+2 H _2 O ( l )$[/tex] [tex]$2 H _3 PO _4( aq )+3 Ca ( OH )_2( aq ) \rightarrow Ca _3\left( PO _4\right)( s )+6 H _2 O ( l )$[/tex]

[Terjawab] Which best describes the pH scale? A. Acids measure below 7. B. Bases measure below 7. C. Acids and bases measure above 7. D. Bases and acids measure at 7.

[Terjawab] What compound is now used as the primary replacement for CFCs? A. methyl chloroform B. carbon tetrachloride C. methyl bromide D. hydrofluorocarbon