enjoy chemistry
... Ans:Halogens are coloured. This is due to absorption of radiations in visible region which results in the excitation of outer electrons to higher energy level. By absorbing different quanta of radiation, they display different colours. For example, F2, has yellow, Cl2 , greenish yellow, Br2, red and ...
... Ans:Halogens are coloured. This is due to absorption of radiations in visible region which results in the excitation of outer electrons to higher energy level. By absorbing different quanta of radiation, they display different colours. For example, F2, has yellow, Cl2 , greenish yellow, Br2, red and ...
full text pdf
... Basing on the results of SO2 sorption at a temperature of about 250°C, Garding and Svedberg7 proposed skipping the stage of the thermal decomposition of bicarbonate in a kinetic model of the process due to the very high speed of the reaction. They limited factors affecting the process speed to resis ...
... Basing on the results of SO2 sorption at a temperature of about 250°C, Garding and Svedberg7 proposed skipping the stage of the thermal decomposition of bicarbonate in a kinetic model of the process due to the very high speed of the reaction. They limited factors affecting the process speed to resis ...
Chlorine
... usually converted back to mercury by reaction with water, producing hydrogen and sodium ( or potassium ) hydroxide at a commercially useful concentration ( 50 % by weight ) . The mercury is then recycled to the primary cell . The mercury process is the least energy - efficient of the three main tech ...
... usually converted back to mercury by reaction with water, producing hydrogen and sodium ( or potassium ) hydroxide at a commercially useful concentration ( 50 % by weight ) . The mercury is then recycled to the primary cell . The mercury process is the least energy - efficient of the three main tech ...
Chemistry 133 Problem Set Introduction
... 1.96 A small beaker is weighed on a balance and found to have a mass of 25.48 g. When it is carefully filled to the rim with water and re-weighed, the mass is 55.78 g. A small piece of metal is then gently dropped into the filled beaker, causing a total of 1.55 g of water to overflow. The total mass ...
... 1.96 A small beaker is weighed on a balance and found to have a mass of 25.48 g. When it is carefully filled to the rim with water and re-weighed, the mass is 55.78 g. A small piece of metal is then gently dropped into the filled beaker, causing a total of 1.55 g of water to overflow. The total mass ...
AVOGADRO EXAMS 1991 - 2002 PRACTICE BOOKLET
... 25. Assume that argon, at a constant temperature and pressure, behaves as an ideal gas. Which of the following is correct? (a) All argon atoms move with the same speed (b) All argon atoms collide with the container walls with the same force (c) Temperature is determined solely by the collision freq ...
... 25. Assume that argon, at a constant temperature and pressure, behaves as an ideal gas. Which of the following is correct? (a) All argon atoms move with the same speed (b) All argon atoms collide with the container walls with the same force (c) Temperature is determined solely by the collision freq ...
4 Expressing and Measuring Chemical Change
... homes and move our vehicles from place to place. Chemical reactions involving oxygen can also be a problem when the metal in many human-made objects spontaneously breaks down in a chemical process called corrosion. Most people take chemical reactions for granted as if they were magic. It is importan ...
... homes and move our vehicles from place to place. Chemical reactions involving oxygen can also be a problem when the metal in many human-made objects spontaneously breaks down in a chemical process called corrosion. Most people take chemical reactions for granted as if they were magic. It is importan ...
C:\SUBJECTS\SUBJECTS\Chemistry
... copper ions to form copper. This is due to the fact that A. iron is in the metallic form while dthe copper is in the ionic form B. the atomic weight of copper is greater than that of ion C. copper metal has more electrons than ion metal D. iron is an inert metal E. iron is higher in the electrochemi ...
... copper ions to form copper. This is due to the fact that A. iron is in the metallic form while dthe copper is in the ionic form B. the atomic weight of copper is greater than that of ion C. copper metal has more electrons than ion metal D. iron is an inert metal E. iron is higher in the electrochemi ...
Chemistry JAMB Past Questions
... An organic compound with a vapour density 56.5 has the following percentage composition: C = 53.1%, N = 12.4%, O = 28.3%, H = 6.2%. The molecular formula of the compound is A. C3H6O2N B. C5H6O2N C. D. (C5H7O2N)½ C5H7O2N ...
... An organic compound with a vapour density 56.5 has the following percentage composition: C = 53.1%, N = 12.4%, O = 28.3%, H = 6.2%. The molecular formula of the compound is A. C3H6O2N B. C5H6O2N C. D. (C5H7O2N)½ C5H7O2N ...
Mole
... relationships between the amounts of reactants used and products formed by a chemical reactions; it is based on the law of conservation of mass. ...
... relationships between the amounts of reactants used and products formed by a chemical reactions; it is based on the law of conservation of mass. ...
Naphtyl-imidazo-anthraquinones as novel colorimetric
... renewal of interest over the past ten years in the 9,10-anthraquinone signalling unit due to its chemosensor ability for several cations such as copper, cobalt and nickel ions [4]. Imidazole derivatives can be used for several optical applications in materials and medicinal chemistry due to the vers ...
... renewal of interest over the past ten years in the 9,10-anthraquinone signalling unit due to its chemosensor ability for several cations such as copper, cobalt and nickel ions [4]. Imidazole derivatives can be used for several optical applications in materials and medicinal chemistry due to the vers ...
Question Bank Topic 5
... Which of the following statements concerning zinc-carbon cells are correct? (1) Used zinc-carbon cells can be disposed of in fire. (2) Zinc-carbon cells leak even though they are not in use. (3) The voltage of zinc-carbon cells drops rapidly over discharge. A (1) and (2) only B (1) and (3) only C (2 ...
... Which of the following statements concerning zinc-carbon cells are correct? (1) Used zinc-carbon cells can be disposed of in fire. (2) Zinc-carbon cells leak even though they are not in use. (3) The voltage of zinc-carbon cells drops rapidly over discharge. A (1) and (2) only B (1) and (3) only C (2 ...
Topic 1 Quantitative Chemistry File
... ratio of atoms of each element in a particle of a substance. Formula, molecular: The formula showing the actual number of atoms of each element in a particle of a substance. Formula, structural: Shows the arrangement of atoms and bonds within a molecule. Ideal gas: A gas for which the relationship p ...
... ratio of atoms of each element in a particle of a substance. Formula, molecular: The formula showing the actual number of atoms of each element in a particle of a substance. Formula, structural: Shows the arrangement of atoms and bonds within a molecule. Ideal gas: A gas for which the relationship p ...
CHEMISTRY OF p-ELEMENTS - Львівський національний
... However, the extracting of aluminum from these silicates is chemically difficult and therefore an expensive process that is why they are not useful ores. Bauxite (consisting of aluminum oxide of various degrees of hydration) is the commercial source of aluminum and its compounds. Gallium, symbol Ga, ...
... However, the extracting of aluminum from these silicates is chemically difficult and therefore an expensive process that is why they are not useful ores. Bauxite (consisting of aluminum oxide of various degrees of hydration) is the commercial source of aluminum and its compounds. Gallium, symbol Ga, ...
379 - FTP
... Hydrogen sulfide occurs in natural gas. It also is found in many sewer gases. It is a by-product of many industrial processes. Trace amounts of dissolved H2S are found in wastewaters in equilibrium with dissolved sulfides and hydrosulfides. It also is found in volcanic eruptions, hot springs and in ...
... Hydrogen sulfide occurs in natural gas. It also is found in many sewer gases. It is a by-product of many industrial processes. Trace amounts of dissolved H2S are found in wastewaters in equilibrium with dissolved sulfides and hydrosulfides. It also is found in volcanic eruptions, hot springs and in ...
An Introduction to Chemical Science
... in chemistry. This enables him not only to assure himself that the experiments of the book are practical, but that the directions for performing them are ample. It is found advisable to perform most of the experiments, with full explanation, in presence of the class, before requiring the pupils eith ...
... in chemistry. This enables him not only to assure himself that the experiments of the book are practical, but that the directions for performing them are ample. It is found advisable to perform most of the experiments, with full explanation, in presence of the class, before requiring the pupils eith ...
answer ch6 - Mr Khaled Nasr
... A unit of quantity that consists of 6.02 x 1023 particles. The mass in grams of one mole of any pure substance. The volumes of gases involved in a reaction and the gases produced exist in fixed ratios. The law which states that equal volumes of gases under identical conditions of pressure and temper ...
... A unit of quantity that consists of 6.02 x 1023 particles. The mass in grams of one mole of any pure substance. The volumes of gases involved in a reaction and the gases produced exist in fixed ratios. The law which states that equal volumes of gases under identical conditions of pressure and temper ...
Review Unit: Chemistry Review
... “Chemical” is one of those words that people often associate with negative feelings or dangerous consequences. In fact, the comfortable lives we lead are due in large part to our understanding and application of chemistry. Some chemicals are harmful to people or the environment, but many are integra ...
... “Chemical” is one of those words that people often associate with negative feelings or dangerous consequences. In fact, the comfortable lives we lead are due in large part to our understanding and application of chemistry. Some chemicals are harmful to people or the environment, but many are integra ...
QUESTION BANK CHEMISTRY-XII THE SOLID STATE CHAPTER
... 3. What are primary cells ? 4. What is over voltage ? 5. What are secondary cells 6. Define corrosion. 7. State Faradays first law of electrolysis . 8. State Faradays second law of electrolysis. 9. HCl does not give an acidic solution in benzene.Why? 10. Under what condition will a galvanic ...
... 3. What are primary cells ? 4. What is over voltage ? 5. What are secondary cells 6. Define corrosion. 7. State Faradays first law of electrolysis . 8. State Faradays second law of electrolysis. 9. HCl does not give an acidic solution in benzene.Why? 10. Under what condition will a galvanic ...
2014_S4_CHM_NORMAL (ALL)
... 53. Element X (atomic number 11) reacts with element Y (atomic number 16) to form an ionic compound. Each atom of X loses one electron and each atom of Y accepts two electrons to form a compound with formula X2Y. 54. Consider the following information: ...
... 53. Element X (atomic number 11) reacts with element Y (atomic number 16) to form an ionic compound. Each atom of X loses one electron and each atom of Y accepts two electrons to form a compound with formula X2Y. 54. Consider the following information: ...
industry: applying chemical reactions
... As you saw in the opening commentaries, the EKS Nitrogen Products Company wants to convert the old Riverwood Corporation building into a chemical plant. This plant would produce fertilizers, a product you may use at home. (See Figure 5.2.) What is in fertilizer that makes it useful for plant nourish ...
... As you saw in the opening commentaries, the EKS Nitrogen Products Company wants to convert the old Riverwood Corporation building into a chemical plant. This plant would produce fertilizers, a product you may use at home. (See Figure 5.2.) What is in fertilizer that makes it useful for plant nourish ...
Chemical Reactions
... experimentally, demonstrating safe handling of chemicals; • identify chemical compounds and reactions in everyday use or of environmental significance. ...
... experimentally, demonstrating safe handling of chemicals; • identify chemical compounds and reactions in everyday use or of environmental significance. ...
chapter 1 - Louisiana Tech University
... a) An atom is the smallest “piece” of an element that can exist and still have the properties of the element. b) Free isolated atoms are rarely encountered in nature. c) Atoms may be decomposed using chemical change. d) Only one kind of atom may be present in a homoatomic molecule. ...
... a) An atom is the smallest “piece” of an element that can exist and still have the properties of the element. b) Free isolated atoms are rarely encountered in nature. c) Atoms may be decomposed using chemical change. d) Only one kind of atom may be present in a homoatomic molecule. ...
Unit 7 Homework and Lab Packet
... 4. Obtain two clean, dry iron nails from your teacher. If the nails are not clean, use a piece of sand paper or steel wool to make the surface of the nail shiny. Find the mass of the nails and record. 5. Place the nails in to the copper(II)sulfate solution. Leave them undisturbed for 20 minutes. Dur ...
... 4. Obtain two clean, dry iron nails from your teacher. If the nails are not clean, use a piece of sand paper or steel wool to make the surface of the nail shiny. Find the mass of the nails and record. 5. Place the nails in to the copper(II)sulfate solution. Leave them undisturbed for 20 minutes. Dur ...
chemistry module p
... Inside the nucleus are found protons (positive charge) and neutrons (neutral charge). Almost all the mass of an atom is in the nucleus with an overall positive charge. Negatively charged electrons orbit the nucleus and define the volume of the atom. This would indicate that atoms are, by far, mostly ...
... Inside the nucleus are found protons (positive charge) and neutrons (neutral charge). Almost all the mass of an atom is in the nucleus with an overall positive charge. Negatively charged electrons orbit the nucleus and define the volume of the atom. This would indicate that atoms are, by far, mostly ...
Ch. 11-12 Supplements
... 11) Use the following equation to answer the questions below. 2 H2 + O2 2 H2O + 126 kcals a. How many moles of oxygen are needed to produce 55.0 grams of water? b. How many kilocalories of energy are produced from the reaction of 44.8 liters of hydrogen? c. If 750. kcal of energy are released, how ...
... 11) Use the following equation to answer the questions below. 2 H2 + O2 2 H2O + 126 kcals a. How many moles of oxygen are needed to produce 55.0 grams of water? b. How many kilocalories of energy are produced from the reaction of 44.8 liters of hydrogen? c. If 750. kcal of energy are released, how ...
Fluorochemical industry
The global market for chemicals from fluorine was about US$16 billion per year as of 2006. The industry was predicted to reach 2.6 million metric tons per year by 2015. The largest market is the United States. Western Europe is the second largest. Asia Pacific is the fastest growing region of production. China in particular has experienced significant growth as a fluorochemical market and is becoming a producer of them as well. Fluorite mining (the main source of fluorine) was estimated in 2003 to be a $550 million industry, extracting 4.5 million tons per year.Mined fluorite is separated into two main grades, with about equal production of each. Acidspar is at least 97% CaF2; metspar is much lower purity, 60–85%. (A small amount of the intermediate, ceramic, grade is also made.) Metspar is used almost exclusively for iron smelting. Acidspar is primarily converted to hydrofluoric acid (by reaction with sulfuric acid). The resultant HF is mostly used to produce organofluorides and synthetic cryolite.