1. Energetics si ygrene neht srucco egnahc yplahtne na fI dna )rH In an exothermic change energy is transferred from the system (chemicals) to the surroundings. The products have less energy than the reactants In an endothermic change‚ energy is transferred from the surroundings to the system (chemicals). The products have more energy than the reactants Enthalpy changes are normally quoted at standard conditions. Standard conditions are : • 1 atm pressure • 298 K (room temperature or 25oC) • Solutions
Free Enthalpy Thermodynamics Energy
Chapter 11 CHEMICAL REACTIONS 153 CHAPTER 11 11. Chemical Reactions All living beings born in this beautiful world have their own life styles. Have you observed and analyzed your daily life from the view point of a chemist? Chemical reactions happen around us all the time and even in our body. Any change can be classified as physical change and chemical change. Physical changes can be easily reversed but‚ it is not easy to reverse a chemical change. What is the reason? In chemical
Premium Acid Hydrochloric acid PH
RNA-binding motif protein 22 (RBM22) has known interactive functions involved in the early stages of pre-mRNA splicing activity [2‚3] as well as nuclear translocation of certain calcium-binding proteins [2]. It contains a conserved RNA-binding domain‚ a zinc finger [2‚3] uniquely downstream of a C-terminus rich in the amino acids Glycine and Proline [2]. Found in both the nucleus and cytoplasm of eukaryotes and yeast [2‚3]‚ RBM22 binds directly to the internal stem-loop (ISL) domain of theU6 snRNA and
Premium DNA Molecular biology Polymerase chain reaction
also called an electron donor as it donates electrons. The electron donors can also form charge transfer complexes with electron acceptors. Examples of good reducing agents are electropositive metal elements such as lithium‚ sodium‚ iron‚ aluminium‚ zinc‚ iron‚ magnesium and carbon. These metals donate electrons readily. In organic chemistry‚ there are very diverse reductants. For example‚ in a catalytic reduction to reduce carbon-carbon double or triple bonds‚ the main reductant would be hydrogen
Premium Hydrogen Oxygen Chemistry
(l) Decomposition of dinitrogen tetroxide: N2O4 (g) 2NO2 (g) Decomposition of calcium carbonate: CaCO3 (s) CaO (s) + CO2 (g) Non-Arrhenius acid/base reaction: Gaseous hydrogen chloride and ammonia react: HCl (g) + NH3 (g) NH4Cl (s) IONISATION of strong and weak acids: Hydrochloric: HCl (g) + H2O (l) H3O+ (aq) + Cl־ (aq) Nitric: HNO3 (l) + H2O (l) H3O+ (aq) + NO3- Sulfuric: H2SO4 (l) + 2H2O (l) 2H3O+ (aq) + SO42־ Ethanoic: CH3COOH (s) + H2O (l) H3O+ (aq) + CH3COO־ (aq) Sources of sulfur
Premium Acid PH
batteries‚ which make them very chemically dependent. These batteries contain positive and negative electrodes. The positive electrode consists of a carbon rod surrounded by a mixture of carbon and manganese dioxide. The negative electrode is made of zinc and certain chemical reactions takes place which in turn produces electrical energy which finally drives the alarm or radio. The two significant contributions made by chemistry towards our lifestyle is the protection of our health and hygiene. The
Premium Chlorine Chemistry Chemical substance
ACI has been accepted as a Founding Member of the Community of Global Growth Companies by the World Economic Forum which is the most prestigious business networking organisation‚ this membership is a matter of pride for us. Company Overview ACI Limited is a leading manufacturer of pharmaceutical finished formulations and modified release ready to fill bulk pellets in Bangladesh. ACI manufactures a wide range of dosage forms including tablet‚ capsule‚ dry syrup‚ powder‚ cream‚ ointment‚ ophthalmic
Premium Ribosomal RNA
UTAR FHSC1134 Inorganic Chemistry Trimester 3 Experiment 1 ________________________________________________________________________ Title: Investigating the Properties of Period 3 Oxides Aim: To examine the oxides of Period 3 elements and describe their structure and bonding. Introduction: Generally‚ there are oxides of metals and non-metals. Metals burn in oxygen to form basic oxides while non-metals form acidic oxides. Structurally‚ they are covalent or ionic compounds. You are to
Free Sodium hydroxide Ammonia Solubility
SUMMATIVE ASSESSMENT –I SCIENCE Class – X Time allowed: 3 hours Maximum Marks: 90 General Instructions: (i) All questions are compulsory. (ii) The question paper comprises of two sections‚ A and B. You are to attempt both the sections. (iii) Questions 1 to 4 in section A are one mark questions. These are to be answered in one word or in one sentence. (iv) Questions 5 to 11 in section A are two marks questions. These are to be answered in about 30 words each. Questions 12 to 23 in section A are three
Premium Chemical reaction Chemistry Magnetic field
observer the ability to identify these gases when they come into contact with them. Procedure Before I began the procedure I gathered all my supplies from the given list in the manual. From there I began the actual experiment and diluted the HCL placed in a test tube and then placed the ZN in the tube as well. I placed the stopper and gas delivery plastic system on the test tube and arranged the tube in the well plate. I then took the test tube filled with water inverted it and placed on
Premium Oxygen Gas Carbon dioxide