Best Results From Yahoo Answers

From Yahoo Answers

Question:Can I make hydrochloric acid from table salt and other household substances. I don't need anything too strong And how do you do it If I need sulphuric acid then is there any way I can make that Any way to do it safely

Answers:Yes: By heating together a mixture of a certain solid household toilet cleaner and sodium chloride (common salt), you ll get hydrogen chloride gas. By dissolving this gas in water, you ll get hydrochloric acid. Alternatively, treating a mixture of the same solid household toilet cleaner and sodium chloride (common salt) with a small amount of water and warming will also generate hydrogen chloride gas. NaHSO4 + NaCl Na2SO4 + HCl [You don't need to worry about getting sulphuric acid!] WARNING: I suggest you don't try it at home, hydrogen chloride is very corrosive. ********************************************** Why not buy hydrochloric acid from your local hardware store? Most sell it as: Spirit of Salt Muriatic acid The stuff is usually very concentrated (~35% HCl) ********************************************

Question:Question from paper chromatography 1. what might happen if ink, rather than pencil, were used to mark the sample line on the chromatography paper? 2. Why should green food coloring be classified as a mixture, whereas yellow, blue, or red should not? 3. A pharmaceutical chemist runs a chromatography test on a substance and identifies two of its components by comparing their Rf values against certain standards. If the two components have Rf values of 1.0 and 0.41 and the solvent front has traveled 12.0 cm from the sample s origin, what is the separation distance on the chromatogram? (Rf= d1/d2) 4. A chemist performs an Rf calculation, obtains a value of 1.2 and decides that the answer is unacceptable. Why? Please help me please. If you help me, ill give you the best answer. Please help me No rude comments (you don t know that i.e.) Thank you for reading and solving have a nice evening

Answers:I'm studying in 10Th standard.so i know only the 1st question.ink is a mixture of several dyes which can be seen by paper chromatography. so if you use ink instead of pencil for marking the sample line,the ink gets split up into several dyes!so the sample line will be gone!

Question:2. a cubic centimeter is a unit for measuring? a. length B. volume C. mass D. density 3. how is iron usually separated from its ores? A. by electolysis B. by making use of its high density C. by panning it D. by heating iron ore and a source of carbon 4. which of the following is NOT a characteristic of a copound? a. has differnt properties from the elements that formed it b. is a pure substance c.different samples have different properties d. can be represented by a formula 5.an unchanging measurement of the amount of matter a object? a. mass B. density C.volume D. length. 6.characteristic properties for a substance A. depends on colume B. depend on temperature. C. never change D. differ on different plants. 7. a(n) __________ is well-blended mixture that appears to be a single substance. A compound B. element. C. pure substance. D. solution 8.a chemical bond is A. a group of atoms that are joined together. b.the basic particle of matter. C. the forces that holds two atoms together D. a substances formed from the chemical combination of two or more atoms. 9. which of the following is an example of a chemical change? A. melting butter B. mising milk and chocolate syrup C. they make up elements. D. they are extrmely small. 10. which of the following is not true of atoms? a. they are composed of molecules. B. they are combine to form compounds C. they make up elements. d. they are extremely small. THANK YOU IF YOU HELP ME ANWSER ALL OF THESES QUESTIONS :]

Answers:1 A 2 B 3 D 4 C 5 A 6 B 7 D 8 C 9 ?? C and D make no sense, A and B are wrong 10 A

From Youtube

Cardiomyogenic differentiation of Mesenchymal Stem cells (KUM2/9-15c)

Mesenchymal stem cells derived from bone marrow are capable of differentiating into cardiomyocytes. However the characteristics of the stem cells are poorly understood, and how the progeny of multipotent cells adopt one fate among several possible fates remains a fundamental question. A hierarchical model has been proposed on the in vitro differentiation of mesenchymal stem cells. Yamada and Umezawa show that mesenchymal stem cells in culture consisted of a mixture of at least three types of cells, ie, cardiac myoblasts, cardiac progenitors and multipotent stem cells, and suggest that commitment of a single-cell-derived stem cell toward a cardiac lineage is stochastic by a follow-up study of individual cells.

Igniting flammable mixtures 1947 Chemistry of Fire US War Department

The ignition temperature of a substance (solid, liquid, or gaseous) is the minimum temperature to which the substance exposed to air must be heated in order to initiate or cause self-sustained combustion. Ignition temperatures of the same substance vary according to the percentage composition of the vapor or gas-air mixture, shape, and size, of space where the ignition occurs, rate and duration of heat, kind and temperature of the ignition source, oxygen concentration, and other effects of materials that may be present. Therefore, given ignition temperatures should be looked upon as approximations. For more information on fire chemistry, go to . For more information on chemical properties and links to chemical databases, go to: www.cdc.gov This is clipped from the 1947 film The Chemistry of Fire from the US War Department. The film describes chemical processes occurring during combustion, using many interesting demonstrations: describes the vaporization of burning articles, demonstrates flash and fire points of various substances, describes how phosphorus burns, oxygen requirements for burning, the operation of an oxy-acetylene torch, and the perils of gasoline vapor, explains ignition temperatures, shows fires caused by static electricity, combustion, bomb explosions, shrapnel piercing fuel lines, and ignition of paint and bedding, describes the use of carbon dioxide, steam, and foam to extinguish fires, fires are extinguished by high-pressure streams of ...

GCSEPod Chemistry - Mixtures

**This is a short sample from GCSEPod Chemistry - Mixtures. The full title is 18 minutes long and includes 4 Chapters. ** Solid, liquid and gas are the three states of matter, and mixtures of them can be formed in a variety of ways. The simplest kind of mixture is a solution. The solid disappears because it is broken up into particles that are too small to be seen. We can measure how much solid dissolves in a certain mass of liquid. This is called the solubility. In a suspension, the particles are small enough so that they don't settle out as sediment but are just large enough to be seen. A suspension is one kind of colloid. Colloids are substances that have mixtures of states. A jelly has some properties like a solid and some like a liquid. Some very useful materials are mixtures. These include emulsions, solutions and alloys. We will consider the various types of mixtures in this title. Visit www.gcsepod.co.uk for more.

Differentiate Between Pure Substances and Mixtures

Learn how to differentiate between pure substances and mixtures

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