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Category: Chemistry
Redox Reactions
Redox Reactions Redox reactions, also known as reduction-oxidation reactions, can be expressed in various ways: Loss or gain of oxygen and hydrogen. Loss or gain of electrons (e–). Changes in oxidation numbers (oxidation state decreases or increases). Importance of Read More …
Electrochemistry and Its Importance
Electrochemistry and Its Importance Electrochemistry The branch of chemistry that deals with the conversion of electrical energy into chemical energy and vice versa is known as electrochemistry. Importance in Everyday Life Electrochemical industries produce millions of tons of essential Read More …
Compounds and Mixtures
Compounds and Mixtures Q1: What is a compound, and how is it defined? A1: A compound is a pure substance composed of two or more elements held together in fixed proportions by natural forces known as chemical bonds. Q2: Read More …
The Debate on the Corpuscular Nature of Matter
The Debate on the Corpuscular Nature of Matter Do you know the debate going on for centuries about the corpuscular nature of matter? An ancient Greek philosopher, Empedocles, thought that all materials are made up of four things called Read More …
Archimedes and His Discovery (Chemistry 9th)
Archimedes and His Discovery Q1: Who was Archimedes, and what task did the Greek emperor assign to him? A1: Archimedes was a Greek philosopher, mathematician, and inventor of war machines. The Greek emperor tasked him with determining whether his Read More …
Fundamentals of chemistry
Overview of Chemistry Chapter What are the simplest components of wood, rocks, and living organisms? This is an age-old question. Ancient Greek Philosophers believed that everything was made of an elemental substance. Some believed that substance to be water, others Read More …
Calculate the number of molecules present in each of the following samples with number of moles
Calculate the number of molecules present in each of the following samples: 5 moles of carbon dioxide 4 moles of ammonia, NH3 09 moles of benzene, C6H6 01 moles of acetic acid, CH3COOH Calculate the Number of Molecules Read More …
Calculate the mass in grams of each of the following samples in moles
Calculate the mass in grams of each of the following samples: a. 1.2 moles of K b. 75moles of H2 c. 0.25 moles of steam d. 1.05 moles of CuSO4.5H2O e. 0.15moles of H2SO4 Step-by-Step Mass Calculation Sample a: Read More …
Calculate the number of moles of each substance in samples with the following masses: a. 2.4 g of He b. 250mg of carbon c. 15g of sodium chloride d. 40g of sulphur
Calculating Moles of Substances Step 1: Understand the Problem We want to calculate the number of moles for different substances based on their given masses. Step 2: Use the Formula The formula to calculate the number of moles Read More …