Everyone knows that water is a readily available liquid that doesn’t burn, and therefore puts out fire, but have you ever thought about why that’s true? This doesn’t happen…. normally. Water is made of hydrogen and oxygen atoms, and both of these elements support combustion. At what temperature does waterRead More →
Dear Student, Complex food substances are carbohydrates(like oligosaccharides, polysaccharides), fats(made up of long chain fatty acids and glycerol), proteins(long chain amino acids). What is the name given to the process of breaking of complex food substances into simpler and soluble substances? Answer: The breaking down of solid and complex foodRead More →
Example: Acidified manganate(VII) ions are a powerful oxidizing agent. They can oxidize Fe2+ ions to Fe3+ ions. At the same time the manganate(VII) ions are reduced to Mn2+ ions. Can cl2 oxidise Fe2+? Chlorine gas is the strongest oxidising agent (E° = +1.36 v). A solution containing dichromate(VI) ions inRead More →
Compounds are pure substances formed by the combination of elements; they can be decomposed by ordinary chemical means. Baking soda is a compound; it contains the elements sodium, hydrogen, carbon, and oxygen, and it decomposes on heating. … Compounds can be separated into their components only by chemical change. CanRead More →
Chloroform and water are not miscible to each other. Which is lighter water or chloroform? Chloroform is heavier than water. Why chloroform is more dense than water? Chloroform is heavier because of higher molecular mass. Is water less dense than chloroform? An object that sinks in water has a densityRead More →
You could be exposed to perchloroethylene through: Breathing it in the air if you work in a dry cleaning business, or if you work where perchloroethylene is made. People who live above or near dry cleaning businesses can be exposed. In the home, dry-cleaned clothes can release small amounts ofRead More →
Substances which allow transmission of infrared radiation through them are called athermanous substances. – For example, wood, metal, CO2, water vapors, etc. Diathermanous substances – Substances that don’t allow transmission of infrared radiation through them are called diathermanous substances. What is meant by Diathermanous? Diathermancy (from “dia” through and “thermē”Read More →
Both gasses can be collected with a small plastic test tube and ignited with a lit splint, giving a satisfying pop. The electrolyte is dilute sulphuric acid (= acidified water) which, during electrolysis is split into hydrogen and oxygen gases. What happens during the electrolysis of sulfuric acid? Electrolysis ofRead More →
Cytoplasm is a thick solution that fills each cell and is enclosed by the cell membrane. It is mainly composed of water, salts, and proteins. In eukaryotic cells, the cytoplasm includes all of the material inside the cell and outside of the nucleus. What is the jellylike substance that containsRead More →