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Questions in chemistry

📝 Answered - An unbalanced chemical equation for the reaction of boron fluoride with lithium sulfite is shown below. [tex]BF _3+ Li _2 SO _3 \rightarrow B_2( SO _3)_3+ LiF[/tex] What is the coefficient of lithium fluoride in the balanced chemical reaction? 1 3 4 6

📝 Answered - The reaction A (aq) ⇌ B (aq) + C (aq) has an equilibrium constant given by: Kc = [B]eq [C]eq / [A]eq Where [X]eq is the equilibrium concentration of X in mol dm⁻³. If a 2.0 mol dm⁻³ solution of A is allowed to reach equilibrium, at which 1.2 mol dm⁻³ of A remains, find the equilibrium concentrations of B and C in mol dm⁻³. Give your answer to 1 significant figure.

📝 Answered - What is the net charge of the ionic compound calcium fluoride? A. 1+ B. 1- C. 2- D. 0

📝 Answered - Which of the following statements is true about single-replacement reactions? A. They involve a single product. B. They are restricted to metals. C. The element replacing the ion in the other reactant must be more active. D. Any metal replaces any other metal.

📝 Answered - What volume, in liters, of 2.0 M NaOH solution can be made using 500.0 g NaOH? [tex]$NaOH : 39.997 g / mol$[/tex] [?] L

📝 Answered - Which of the following is an acid-base reaction? [tex]Fe ( s )+2 AgNO _3( aq ) \rightarrow 2 Ag ( s )+ Fe \left( NO _3\right)_2( aq )[/tex] [tex]C ( s )+ O _2(g) \rightarrow CO _2(g)[/tex] [tex]MgSO _4( aq )+ Ba \left( NO _3\right)_2( aq ) \rightarrow Mg \left( NO _3\right)_2( aq )+ BaSO _4(s)[/tex] [tex]2 HClO _4( aq )+ Ca ( OH )_2( aq ) \rightarrow 2 H _2 O ( I )+ Ca \left( ClO _4\right)_2( aq )[/tex] None of the above are acid base reactions.

📝 Answered - During the reaction between potassium hydroxide and 2-bromopropane, 2-propanol is formed. Suggest the correct mechanism for this reaction. Choose an answer: A) $S_N2$ B) $S_N1$ C) Neither $S_N1$ nor $S_N2$

📝 Answered - In _______ elements, the outermost shell of an atom contains half the number of electrons needed to complete the shell. It may either borrow or lend electrons.

📝 Answered - The reaction below is at dynamic equilibrium. [tex]N_2(g)+3 H_2(g) \longleftrightarrow 2 NH_3(g)[/tex] Which statement is true for the equilibrium system? A. The concentration of [tex]NH _3[/tex] is greater than the concentration of [tex]N _2[/tex]. B. The rate of the forward reaction equals the rate of the reverse reaction. C. The rate of the forward reaction is greater than the rate of the reverse reaction.

📝 Answered - How do chemical properties differ from physical properties? What is a chemical change? Provide two examples.