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Questions in chemistry

📝 Answered - Consider the reaction: [tex]2 HF(g) \longleftrightarrow H_2(g)+F_2(g)[/tex] At equilibrium at 600 K, the concentrations are as follows: [tex] \begin{array}{l} {[HF]=5.82 \times 10^{-2} M} \\ {\left[H_2\right]=8.4 \times 10^{-3} M} \\ {\left[F_2\right]=8.4 \times 10^{-3} M} \end{array} [/tex] What is the value of [tex]K _{ eq }[/tex] for the reaction expressed in scientific notation? A. [tex]2.1 \times 10^{-2}[/tex] B. [tex]2.1 \times 10^2[/tex] C. [tex]2.2 \times 10^{-1}[/tex] D. [tex]1.2 \times 10^{-3}[/tex]

📝 Answered - Consider this reaction: $2 LIOH + H _2 SO _4 \rightarrow 2 H _2 O + LI _2 SO _4$ Which compound is acting as an acid in this reaction? A. LIOH B. $H _2 SO _4$ C. $H _2 O$ D. $H _2 SO _4$

📝 Answered - The pH level, [tex]$P$[/tex], of a liquid can be determined from the hydronium ion [tex]$\left( H _2 O ^{+}\right)$[/tex] concentration, c, using the equation [tex]$P=- log ( c )$[/tex]. If the pH level of grape juice is 3.3, what is the hydronium Ion concentration? A. [tex]$501 \times 10^{-4}$[/tex] B. [tex]$1.19 \times 10^{-2}$[/tex] C. [tex]$1.99 \times 10^3$[/tex] D. [tex]$153 \times 10^4$[/tex]

📝 Answered - Select the correct answer. What is the hydronium $(H_3O^+)$ concentration of a solution with a pH of 3.60? A. $2.5 \times 10^{-4} M$ B. $3.0 \times 10^{-4} M$ C. $4.0 \times 10^{-11} M$ D. $4.5 \times 10^{-11} M

📝 Answered - Which of the following solutions will have maximum osmotic pressure? Assume 90% dissociation of each salt: (a) Decimolar aluminium sulphate (b) Decimolar barium chloride solution (c) Decimolar sodium sulphate solution (d) Solution of equal volumes of decimolar barium chloride and decimolar sodium sulphate solutions

📝 Answered - What volume, in liters, of 1.5 M [tex]$CaCl _2$[/tex] solution can be made using [tex]$1200.0 g CaCl _2$[/tex]? [tex] \begin{array}{c} CaCl_2: 110.98 g / mol \\ {[?] L} \end{array} [/tex]

📝 Answered - What is the theoretical phenolphthalein alkalinity of a saturated solution of Ca(OH)2?

📝 Answered - What is the pOH of a solution with [tex]$\left[ OH ^{-}\right]=1.4 \times 10^{-13} ?[/tex] A. 13.15 B. 12.85 C. -13.15 D. 14.00

📝 Answered - How do chemical properties differ from physical properties?

📝 Answered - 8. What chemical reaction occurs when iron reacts with oxygen and moisture in the air? A. Formation of aluminum oxide B. Rusting C. Release of carbon dioxide 9. Which material is considered biodegradable? A. Plastic drinking straw B. Nylon fishing line C. Banana peel 10. What happens to a banana peel when it is discarded in a natural environment? A. It remains unchanged B. It decomposes into simpler organic compounds C. It reacts with other materials to form new substances D. It breaks down into smaller pieces