Login
Premium
Home Question Bank Chemistry Archive 2024 December 11

Chemistry Questions from Dec 11,2024

Browse the Chemistry Q&A Archive for Dec 11,2024, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

error msg
2. Find \( \Delta \mathrm{H}^{\circ} \) for the reaction \( 2 \mathrm{H}_{2}(\mathrm{~g})+2 \mathrm{C}(\mathrm{s})+\mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}(\mathrm{l}) \), using the following thermochemical data. \( \begin{array}{ll}\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}(\mathrm{l})+2 \mathrm{O}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{CO}_{2}(\mathrm{~g})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) & \Delta \mathrm{H}=-875 \mathrm{~kJ} \\ \mathrm{C}(\mathrm{s})+\mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{CO}_{2}(\mathrm{~g}) & \Delta \mathrm{H}=-394.51 \mathrm{~kJ} \\ \mathrm{H}_{2}(\mathrm{~g})+1 / 2 \mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) & \Delta \mathrm{H}=-285.8 \mathrm{~kJ}\end{array} \) Las reacciones de combinación o sintesis suceden al combinarse dos elementos químicos para formar un compuesto. De las reacciones dadas a continuación todas son por combinación, EXCEPTO: A. \( \mathrm{Cl}_{2}+\mathrm{H}_{2} \rightarrow 2 \mathrm{HCl} \) B. \( 2 \mathrm{Ca}+\mathrm{O}_{2} \rightarrow 2 \mathrm{CaO} \) C. \( 4 \mathrm{P}+\mathrm{O}_{2} \rightarrow 2 \mathrm{P}_{2} \mathrm{O}_{3} \) D. \( \mathrm{Mg}+\mathrm{AlCl}_{2} \rightarrow \mathrm{MgCl}_{2}+\mathrm{Al} \) Las reacciones de doble desplazamiento, son aquellas en las cuales dos elementos de un compuesto, son sustituidos por otros dos elementos al pasar a productos. De las reacciones dadas a continuación, zcuáles de doble desplazamiento? A. \( 2 \mathrm{KI}+\mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2} \rightarrow \mathrm{PbI}+2 \mathrm{KNO}_{3} \) B. \( \mathrm{Bi}_{2}\left(\mathrm{SO}_{4}\right)_{3} \rightarrow \mathrm{Bi}_{2} \mathrm{~S}_{3}+6 \mathrm{O}_{2} \) C \( 2 \mathrm{BI}_{2}+6 \mathrm{HCl} \rightarrow 2 \mathrm{BiCl}_{3}+3 \mathrm{H}_{2} \) D. \( \mathrm{N}_{2}+3 \mathrm{H}_{2} \rightarrow 2 \mathrm{NH}_{3} \) Relacione la simbologia, con los tipos de reacciones químicas. \( \begin{array}{ll}A B \rightarrow A+B \\ A+B C & A C+B \\ A+B & \text { Elegir... } \\ A B & \\ A B & \text { Descomposición }\end{array} \) 5. Compare For each of the given elements, list two other elements with similar chemical properties, \( \begin{array}{ll}\text { a. iodine (II) } & \text { b. barium (Ba) }\end{array} \) Calculate the molar mass of a compound with 1 calcium, 1 carbon, and 3 oxygens. c. A partir de una solución 5 M de cloruro de sodio ( NaCl ) se realizaron tres diluciones seriadas con factor de dilución \( 1 / 5 \). Calcula la concentración de cada dilucion en \( \% \mathrm{~m} / \mathrm{v} \). Cleaning agents are complex mixtures of chemical components, each with its own specific purpose. The components have very precise measurements to ensure that the cleaning agent has the right properties. What is a cleaning agent an example of? (Hint: it's a type of mixture). Enter your answer Strontium-90 is a radioactive material that decays according to the function \( A(t)=A_{0} e^{-0.0244 t} \), where \( A_{0} \) is the initial amount present and \( A \) is the amount present at time \( t \) (in years). Assume that a scientist has a sample of 800 grams of strontium-90. (a) What is the decay rate of strontium-90? (b) How much strontium- 90 is left after 40 years? (c) When will only 200 grams of strontium-90 be left? (d) What is the half-life of strontium-90? (a) The decay rate of strontium- 90 is \( \square \% \). (Type an integer or a decimal. Include the negative sign for the decay rate.) Strontium-90 is a radioactive material that decays according to the function \( A(t)=A_{0} e^{-0.0244 t} \), where \( A_{0} \) is the inifial amount present and \( A \) is the amount present at time \( t \) (in years). Assume that a scientist has a sample of 800 grams of strontium- 90 . (a) What is the decay rate of strontium- 90 ? (b) How much strontium- 90 is left after 40 years? (c) When will only 200 grams of strontium- 90 be left? (d) What is the halt-life of strontium- 90 ?
Prev 1 2 3 4 5 6 7 Next
1 2 3 4 5 6 7
Prev Next
Study can be a real struggle
Why not UpStudy it?
Select your plan below
Premium

You can enjoy

Start now
  • Step-by-step explanations
  • 24/7 expert live tutors
  • Unlimited number of questions
  • No interruptions
  • Full access to Answer and Solution
  • Full Access to PDF Chat, UpStudy Chat, Browsing Chat
Basic

Totally free but limited

  • Limited Solution
Welcome to UpStudy!
Please sign in to continue the Thoth AI Chat journey
Continue with Email
Or continue with
By clicking “Sign in”, you agree to our Terms of Use & Privacy Policy