Percent Composition / Composition by mass

What is the mass percent of all the elements in Sodium bicarbonate (NaHCO3)?

Simplest Formula Analysis

50.0 g of an oxide of Chromium (Cr) was found to contain 13.28g of potassium (K), 17.68 g of Chromium (Cr) and 19.04 g of oxygen (O). Find the simplest formula...

True or False chemistry

A) XeOF2 is polar, ``T''-shaped (with bond angles of approximately 90 and 180 degrees), and can be said to use xenon dsp3 hybrid orbitals for sigma-bonding. B) SeF6 is polar, square pyramidal (with bond angles of approximately 90 and 180 degrees), and can be said to use selenium d2sp3 hybrid orbitals for sigma-bonding. C) Kr ...continues

VSEPR THEORY...MOLECULAR STRUCTURE

1)predicted by the VSEPR theory, What is the molecular structure (bonds only) in SeF6? 2)what is the molecular structure for the arrangement of bonds and lone pairs of electrons on the central Xe atom in XeOF2? 3)predicted by the VSEPR theory, for the arrangement of bonds and lone pairs of electrons on the central Kr atom ...continues

Cholesterol .....structure questions...

please view the attachment...of diagram of cholesterol I. Which of the following groups of atoms lie in a common plane? (enter the letter label(s), unspaced--there may be more than one correct): A. 5,6,7,10 B. 1,2,3,4,5,10 C. 7,8,9,10,11 D. 24,25,26,27 II. What is the hybridization of atom number 27? (enter the lette ...continues

Find pH

Could you show me how you solved to get pH of each solution: Solution A has [H3O+] = 7.2à—10-5 Solution B has [H3O+] = 7.2à—10-4 Solution C has [OH-] = 3.0à—10-11 Solution D has [OH-] = 6.5à—10-11 (i) Which solution has the highest pH? (ii) Which solution is the least acidic? (iii) Which solution is the most acid ...continues

solution stoichiometry-titrations

How many milliliters of 0.125M H2SO4 are needed to neutralize 0.200g of NaOH?

Chemistry multiple choice questions

the chemistry multiple choice questions are added as an attachment. do not necessarily need to show the work for solving the questions, as long as the answers are stated its all right. please also include a list at the end, with the question number and the answer beside it: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12.

Calculate the pH

1) Calculate the pH of the following solutions: (a) 0.010 M acetic acid (Ka= 1.76E-5) CH3COOH + H2O --> H3O+ + CH3COO- initial 0.010 -- ? ? Equilibrium 0.010-x -- ? ? Show how did you solve this equation to get 1.76E-5: Ka = [H3O][CH3COO]/[CH3COOH] = 1.76E-5 (b) ...continues

oxidizing and reducing agents

In the following reaction, identify the oxidizing and reducing agents. Br2 + H2 --> 2HBr a. H+ is the reducing agent, Br- is the oxidizing agent b. Br2 is the reducing agent, H+ is the oxidizing agent c. Br2 is the reducing agent, H2 is the oxidizing agent d. HCl is the reducing agent, Br2 is the oxid ...continues