VIHS/ Department of Chemistry Chemistry Revision Unit II (Edexcel) (01) a) When lithium nitrate and sodium nitrate are heated separately‚ both decompose giving oxygen gas as one of the products. (i) Which of these two nitrates would decompose at the lower temperature? .........................................................………………………………………….................... (ii) Give the name of any other product formed when sodium nitrate is heated. .....................................................
Premium Alcohol Sodium Iodine
evaluated by an acid-base neutralization titration. (When an acid and a base are placed together‚ they react to neutralize the acid and base properties‚ producing a salt.) From the Bronsted-Lowry acid-base reaction theory‚ the H+ cation of the acid combines with the OH- anion of the base to form water. In this titration experiment‚ there are no definitive acidic or basic agents being evaluated. This requires the use of the Lewis acid-base theory. Instead of defining acid-base reactions in terms of protons
Premium Titration Acid Water
The Nature of biology and science Cell theory: * All organisms are made of cells and the products of cells * All cells come from pre-existing cells * The cell is the smallest organisational unit Cells have an outer membrane‚ encloses fluid contents of cell (cytoplasm) Robert Hooke (1665): observed dead cells from bark Anton van Leeuwenhoek: described living cells Matthias Schleiden: plant issues Theodor Schwann: animal tissues Bacteria found without nucleus and lacking other membrane-bound
Premium Atom Molecule Chemical bond
separated by layers of hydrated cations) and anionic or brucite type (in which the charge on the layer and the gallery ion is reversed complimentary to smectite type). Anionic clays are rare in nature but they are relatively easy and inexpensive to prepare in the laboratory. Hydrotalcite belongs to the class of anionic clays wherein the positively charged contiguous layers formed by the edge sharing of Mg*(OH)6 and Al(OH)6 octahedra are separated by charge balancing anions and water‚ these occupying
Free Hydrogen Oxygen Oxide
ARTICLE IN PRESS Minerals Engineering xxx (2005) xxx–xxx This article is also available online at: www.elsevier.com/locate/mineng Silver recovery from synthetic photographic and medical X-ray process effluents using activated carbon K.G. Adani‚ R.W. Barley *‚ R.D. Pascoe Camborne School of Mines‚ School of Geography‚ Archaeology and Earth Resources‚ University of Exeter‚ Tremough Campus‚ Treliever Road‚ Penryn‚ Cornwall TR10 9EZ‚ United Kingdom Received 29 April 2005; accepted 24 May 2005
Premium
Cathode and Anode Cathode: the electrode which becomes positively charged. During the process‚ negatively charged ions (Anions) move towards the electrode whilst positively charged ions (Cations) move away. Anode: Electrode which becomes negatively charged. During the process‚ positively charged ions (Cations) more towards the electrode whilst negatively charged ions (Anions) move away. [Electrodes for this experiment are firstly copper and secondly galvanized steel] (Wikipedia Editor ‚ 2012)
Premium Electrochemistry Zinc Battery
hair cell – designed to increase the surface area of the root for absorption of water and mineral nutrients into the plant. These cells have a very thin cell wall that is fully permeable that allows the absorption of mineral nutrients as ions by cation and anion exchange. Contain large vacuoles for the short term storage of these nutrients. Epidermal cells – feature a waxy cuticle (covering) to help prevent water loss from the plant‚ the cells on the top side of the leaf tend to be more waxy due to
Premium Cell Cell nucleus Gamete
First pass metabolism. Pharmacology is the study of the effects drugs have and how they exert them. Drugs can be administered enteral or parenteral. [1] Enteral refers to any form of administration that involves the alimentary tract. The four enteral routes of administration include the mouth‚ sublingual‚ buccal and rectal. Parenteral refers to routes of administration outside of or beside of the alimentary tract. The parenteral route includes intravascular (IV)‚ Intramuscular (IM) and subcutaneous
Premium Glomerulus Pharmacology Kidney
To obtain a general effect‚ the drug is usually given by oral or parenteral route. The choice depends on the drug i.e. the existence of preparations appropriate for these uses and on the state of the patient. Emergency or the impossibility of intake by mouth makes the parenteral route necessary. To obtain a local effect‚ special preparations like the ophthalmic solutions‚ but it should be remembered that a systemic diffusion is always possible after local administration. Parenteral route
Premium Route of administration Digestion Intravenous therapy
numbers such as 15-30-15. These numbers mean that the plant food is guaranteed to contain at least 15% nitrogen‚ 30% phosphorus (expressed as P2O5) and 15 % potassium (expressed as K2O). The remaining of the product is fillers‚ dyes and other anions and cations to balance the charge in the chemical compounds. In this experiment‚ we will illustrate a quality control analysis for the determination of phosphorus in plant food by gravimetric analysis. Phosphorus will be determined by precipitation
Premium Filter paper Solubility Ammonia