Explore BrainMass

General Chemistry

Calculating the effect of pressure on solubility

The solubility of CO2 in water at 25°C and 1 atm is 0.034 mol/L. What is its solubility under atmospheric conditions? (The partial pressure of CO2 in air is 0.0003 atm.) Assume that CO2 obeys Henry's law. I can't seem to get this problem correct. I believe I am to find the product of .034x.0003 which gives me 1.02e-5.

Determining Molecular Formulas and Compounds

1. A 0.1014 g sample of purified glucose was burned to produce 0.1486 grams of carbon dioxide and 0.09 g of water. Glucose contains only C,H,and O. Determine the empirical formula of glucose. If the molecular mass of glucose is 180, what is the molecular formula of glucose. 2. A granulated sample of aircraft alloy (Mg, Al,

Molecular Geometry for Carbon Atoms

_____1) Which atom below has 4 valence electrons? a) Carbon b) Beryllium c) Hydrogen d) Nitrogen e) None _____2) What is the correct Lewis dot structure for oxygen? a) b) c) d) e) no right choice _____3) Which chemical has the most number of valence electrons in its Lewis structure (electron-dot structure)?

Natural and Chemical Cleaners

What is the chemical make-up of natural cleaners? How do these products compare to traditional cleaners? Are the active ingredients the same or different? How do the products differ from traditional cleaning products? Are these products safer or more environmentally friendly than traditional products?

Boiling Point of a Solution of Ethylene Glycol and Water

11.4 L Ethylene glycol (C2H6O2), a nonelectrolyte, is added to 12.1 L of waterto produce an antifreeze solution with a freezing point of -31.5°C? (The density of ethylene glycol is 1.11 g/cm3, and the density of water is 1.00 g/cm3.) What is the boiling point of this solution? °C

Solubility Problems

Please refer to the attachment for the complete solution. A solution contains 0.01 M Ag+, 0.04 M Hg22+ and 0.1 M Pb2+. NaCl is gradually added to precipitate the Ag+ as AgCl, the Hg22+ as Hg2Cl2, and the Pb2+ as PbCl2. Given the following Ksp values: AgCl (Ksp = 1.6 x 10-10); Hg2Cl2 (Ksp = 3.5 x 10-18); PbCl2 (Ksp = 2.4 x

Complete balanced equation

Please provide a complete balanced equation of the combustion of the following molecules. Also, indicate all phases (g,l,s): a) CH3OH b) COCl2 c) H2NOH d) N2O4 Please refer to the attached file for the proper formatting.

Information on dihydrogen phthalate

I try to look up information on dihydrogen phthalate, and not much information can be found through the search engines online. However I need to know if there is a balanced equation of NaOH and dihydrogen phthalate as a primary standard, and what does the structure of dihyrogen phthalate looks like.

Calculate Wavelength, Energy

The blue color of the sky is due to the scattering of sunlight by the molecules in the air. The blue light has a frequency of about 7.5 x 10^14 Hz. A. Calculate the wavelength, in nm, associated wth this radiation. I believe the correct formula for this part is speed of light (299,792,458 m/s x 7.5 10^14 Hz). B. Calcul

Genetic Mutation and Blood Disorders

1. Define a genetic mutation and state the types of genetic mutations. Discuss the effects of genetic mutations. 2. A thirteen-year-old girl, who is underdeveloped and thin, has a blood disorder. She frequently experiences chest and abdominal pain, fever, and coughing, and has trouble breathing. Her teachers often spend ad

Significant Figures: Example Problem

I am trying to figure out the proper answer in significant figures for this, I'm not sure which rule I follow, the addition/subtraction rule or the multiplication/division rule? 320.5 - (6104.5 / 2.3) I'm wondering if the answer should be -2333.6 or -2379.5? Could you please show work? Thank you!

Engine Piston Displacement: Example Problem

I am unsure of how to properly answer this question. What is the engine piston displacement in litres of an engine whose displacement is listed as 450 in.3? (inches cubed in.^3) I made an attempt at the question: 450 in.3 (16.4 cm3 / 1 in.3 ) (1 mL / 1 cm3 ) ( 1 L / 1000 mL) = 7.38 L I'm not sure if that's right

Multiplication, Division, Adding and/or Subtracting

I understand the rules for significant figures with multiplication/division, and adding/subtracting. But I am unsure of what to do when there is both multiplication and/or division, and adding and/or subtracting in the same question? ex: (0.0045 x 20 000.0) + (2813 x 12) 90.0 + 33756 = 33846 (following BEDMAS I end up

Gas Laws: Partial Pressure in a Mixture

Consider the flasks diagrammed below. Before opening the stopcock, the flask on the left contains 445 torrs of H2 gas and the flask on the right contains 0.190 atm of N2 gas. What are the final partial pressures of H2 and N2 after the stopcock between the two flasks is opened? (Assume the final volume is 3.00 L.) What is the tot

Calculating Vapor Pressure: Example Problem

A 2.30 L sample of O2(g) was collected over a liquid at a total pressure of 785 torr and 25°C. When the O2(g) was dried (vapor of that liquid removed), the gas had a volume of 1.86 L at 25°C and 785 torr. Calculate the vapor pressure of this liquid at 25°C.

Atom of Tin and Sn Molecules

An atom of tin (Sn) has a diameter of about 2.8 x 10 -8 cm. a. What is the radius of a tin atom. ? _________________Angstroms (A) and ________________m b. how many Sn atoms would have to be placed side by side to span a distance of 6.0 um? _________________________number os Sn atoms c

Balancing Reactions

Please see the attached file for the fully formatted problems. In the real world, you do not have a program to balance equations for you. For questions 12-16 below, please fill in the first table below to indicate the initial numbers of reactant and product atoms. Balance the equation on your own and then fill in the second

Full Ionic and Net Ionic Equations

Write the ionic and net ionic equations for the following reactions. a) AgNO3 (aq) + Na2SO4, (aq)-----> B). BaCl2 (aq) + ZnSO3 (aq)-------> C). (NH4)2CO3 (aq) + CaCl2 (aq)------>

Geometric Structure and Localized Bonding Models

Geometric Structure and Localized Bonding Models (also as attachment) 1. For each of the following chemical species: (i) write acceptable Lewis structures (including major resonance contributors and indicating formal charges); (ii) designate oxidation states for all atoms; and (iii) draw the stereochemical structures predi

Ionic, polar covalent and non-polar compounds

How do you tell if a compound is ionic, polar covalent, or non-polar? Find out for these compounds (Big numbers are used to represent the number of atoms because they are all 1 molecule.) a) Na2SO4 b)KOH c)(NH4)2SO d) C6H14 e)C2H5OH f)H20

Ksp and Solubility: Concentrations of Ions in Solution

What are the concentrations of each of the ions in a saturated solution of PbBr2, given the Ksp of PbBr2 is 2.1 x 10^-6? I get stuck in solving this question when I get to the equation 4(x^3)=2.1 x 10^-6 and I don't know how to get to the answer x = 8.07 x 10 ^-3 M which is supposedly the concentration of Pb 2+. Real

Explanation of melting point & boiling point deviations

I only need help on question 3. I have perfomed the labs for melting pt and boiling pt on the following four and only need help with question 3 acetonitrile (C₂H₃N): GIVEN MP = -45.5C, BP = 77.3C My results MP= -46.8 C, BP = 79.4 C benzene (C6H6) GIVEN

Molar solubility product of barium fluoride

Please help with the following problems. Provide step by step calculations for each. 5.[a] The molar solubility of barium fluoride, BaF2, is 7.5 x 10-3 M. Calculate the solubility product constant [b]Calculate the molar solubility of lead fluoride, PbF2 in water, Ksp = 2.7 x 10-8 6.Calculate the molar solubility of bism

Calculating the Pressure of Gas Sample in a Manometer

In a manometer the mercury level at the open end of the tube is 215 mm higher than at the closed end of the tube. If the atmospheric pressure is 1 atm, what is the pressure of the gas sample in units of torr? A)1.28 torr B)545 torr C)975 torr D)215 torr

Alkanes and Boiling Points

Which of the following shows the alkanes in correct order from lowest to highest boiling points? A) hexane, pentane, butane, propane, ethane, methane B) hexane, ethane, propane, butane, pentane, methane C) methane, ethane, propane, butane, pentane, hexane D) metane, ethane, propane, pentane, butane, hexane

PowerPoint Presentation on the Element Boron

BORON I am looking for someone who is knowledgeable with PowerPoint. I need help getting started with this project and knowing how to go about this. My classmates told me finding a scientific article is the hard part to this project, so I want someone to help me with that also. _______________________________________