Reaction

Which of the following statement is true? a. A heterogenous catalyst is in a different phase from the reaction mixture b. Enzymes are protein molecules which catalyze reactions c. Catalysts are not consumed in reactions d. Answers a and b are true e. Answers a, b, and c are true

General Chemistry Help

Here is my question: A mystery compund X, composed of carbon, hydrogen, and oxygen combusts with oxygen gas in a sealed, steel cylinder to produce carbon dioxide and water gases. The temperature remains constatnt at 100 C throughout the reaction, and the cylinder has a volume of 1.50 L. The partial pressure of oxygen is init ...continues

acid base titrations and pH

Calculate the pH when 25.0 mL 0.20M HCl is titrated with 30.0mL of .20 M NH3 Kb(NH3)=1.8x10^-5

Calculating the concentration of hydrogen given the pH level.

A solution has a pH of 6.72. Calculate the concentration of hydrogen ions in the solution.

chemistry

How would you describe how to separate a mixture of oil, sand, and saltwater.

Calculating the molecular formula of an organic compound. Worked example, using fundamental formula and balanced equations.

 1 dm3 of hydrocarbon A at 1 atmosphere pressure is shown to have a mass of 2.333g. Given that the molar volume of a gas at S.T.P (ie 25°C, 1 atm) is 24 dm3. Please answer the following: 1) Calculate the molecular formula of A 2) A is a member of which homologous series?  15 cm3 of a mixture of ...continues

A table of observations made by a student who performed chemical tests on some unknown salts. Identify the unknown salts from the recorded observations

Using the information in the attached table, please answer the following: 1) Identify the compounds 1-5 2) For each compound that you identify support your decision with explanations for the given observations, also with equations for each reaction.

Problem: A flow chart detailing some reactions of an Ester. Solution: Details the missing parts of the flow chart and provides answers to related questions.

Using the flow chart provided (see attachment Brainmass Problem 6). Please answer the following. 1) Give the structures and names of compounds 1-7. 2) Estimate the pH of compound 3? 3) Explain with an equation the reaction in which compound 4 is changed to 6 4) What are the key differences between the hydrolysis o ...continues

Relationships between wavelength, frequency, and energy of light.

A certain colour of light has a wavelength of 550 nm. What is the energy possessed by a photon of such light? (a) 2.42 x 10E-19 (b) 5.45 x 10E14 J (c) 3.61 x 10E-14 J (d) 3.61 x 10E-19 J (e) 5.37 x 10E-19 J

Relationships between wavelength, frequency, and energy of light

Calculate the frequency, in units of "per second", of light with a wavelength of (a) 540 nm, and (b) 650 nm.