VincenTragosta - Tanya, Jawab, dan Belajar Tanpa Batas Logo

Questions in chemistry

[Terjawab] What is the pH of $9.55 \times 10^{-7} M HCl \left( H ^{+}\right)$ solution? A. 9.55 B. 0.166 C. $1.05 \times 10^{-8}$ D. 6.02 E. none of these available choices

[Terjawab] Which of the following polymers need at least one diene monomer for their preparation? A) Dacron B) Neoprene C) Buna-S D) Both B and C

[Terjawab] Sodium $(Na)$ has 11 protons and 12 neutrons. What is its isotope notation? A. $Na -11$ B. $Na-12$ C. $Na -23$ D. $Na -34$

[Terjawab] Select the correct answer from each drop-down menu. Determine the molecular formula of the compound. A compound is used as a gasoline additive. It has a molecular weight of 60.10 atomic mass units and an empirical formula of [tex]$C _3 H _8 O$[/tex]. The molecular formula is C

[Terjawab] The polymer used in making synthetic hair wigs is made up of: (A) C₂H₃CH=CH₂ (B) CH₂=CH-CH=CH₂ (C) CH₂=CHO (D) CH₂=CHCOOCH₃

[Terjawab] For a first order reaction, [tex] t_{99.99\%} = y \times t_{90\%} [/tex] Find the value of [tex] y [/tex].

[Terjawab] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Terjawab] Using the activity series provided, which reactants will form products? $Na>Mg>Al>Mn>Zn>Cr>Fe>Cd>Co>Ni>Sn>Pb>H>Sb>Bi>Cu>Ag$ $Ag + NaNO _3 \rightarrow$ $Fe + Al _2 O _3 \rightarrow$ $Ni + NaCl \rightarrow$ $Fe + Cu \left( NO _3\right)_2 \rightarrow$

[Terjawab] Consider the following chemical equation in equilibrium: [tex]$H_2 SO_4(aq) \Leftrightarrow 2 H^{+}+SO_4^{2-}$[/tex] What will happen to the chemical equilibrium if HCl is added to the system? A. The chemical equilibrium will be lost permanently. B. The chemical equilibrium will not be affected. C. The chemical equilibrium will shift to the left

[Terjawab] Use the reaction [tex]I _2(s) \rightleftharpoons I _2(g), \Delta H=62.4 kJ / mol , \Delta S=0.145[/tex] [tex]kJ /( mol \cdot K )[/tex], for this question. At what temperature is the reaction at equilibrium? A. 62 K B. 0.002 K C. 157 K D. 430 K