neutron is added to the nucleus of an atom: a) the proton number is altered b) the nucleon number is changed c) the new atom is an isotope of the original atom 24. Calculate the relative molecular mass of the following compounds: a) b) c) d) HNO3 Na2CO3 KClO4 Al2(SO4)3 25. The element boron consists of two isotopes‚ 11 5 B is 10 11 5 B and 5 B . Their masses‚ based on the 10 5 B
Premium Chemistry Water Sulfuric acid
Standardization of Solution and Titration Lab Report‚ Preparing a Dilute HCl Solution from a Concentrated One Titrating NAOH Solution with HCl Solution (of Known Concentration) Chemistry lab report(by abdazino abdalla) International College Objective preparing a dilute HCl solution from a concentrated one titrating NAOH solution with HCl solution (of known concentration) Procedure Section A: Preparation of 100.0cm3 0.480 mol/dm3 HCl solution a)Determine the volume of the concentrated acid
Premium Sodium hydroxide Titration Hydrochloric acid
In 1860‚ the first instrumental analysis was performed by Robert Bunsen and Gustav Kirchoff who used flames tests that led to the discovery of the elements rubidium (Rb) and caesium (Cs). After this‚ this method was used everywhere to find the chemical make ups of many substances. For example‚ in 2007 there was a huge problem where tainted pet food would cause many pets to become ill. Qualitative analysis was used and it was discovered that Melamine was found in the pet food which altered the results
Premium Chemistry Hydrogen Water
Zn(NO3)2‚ 0.2 M‚ 100 mL* Hydrochloric acid‚ HCl‚ 6 M‚ 125 mL* Nitric acid‚ HNO3‚ 6 M‚ 125 mL* Ammonia‚ NH3‚ 6 M‚ 125 mL* Sulfuric acid‚ H2SO4‚ 6 M‚ 125 mL* Acetic acid‚ CH3COOH‚ 6 M‚ 125 mL* Sodium chloride‚ NaCl‚ 0.2 M‚ 100 mL* Sodium carbonate‚ Na2CO3‚ 0.2 M‚ 100 mL* Sodium hydroxide‚ 6 M‚ 100 mL* Sodium sulfate‚ Na2SO4‚ 0.2 M‚ 100 mL* Sodium nitrate‚ NaNO3‚ 0.2 M‚ 100 mL* Barium chloride‚ BaCl2‚ 0.1 M‚ 100 mL* Barium hydroxide‚ Ba(OH)2‚ 5 g* Potassium thiocynate‚ KSCN‚ 0.1 M‚ 100 mL* Potassium
Premium Ion Ammonia Sodium chloride
Topic 8a – Carbonyl compounds Revision Notes 1. Introduction • Aldehydes and ketones are carbonyl compounds • They contain the carbonyl group C=O • The functional group in aldehydes is –CHO on the end of a chain e.g. ethanal CH3CHO • The functional group in ketones is C=O not at the end of a chain e.g. propanone CH3COCH3 2. AS Recap • Primary alcohols are oxidised by acidified potassium dichromate. An aldehyde is produced first and this can be further oxidised
Premium Fatty acid Carboxylic acid Alcohol
Charles Darwin; the creator and innovator of the theory of evolution deemed the application of human skills of creating of fire the second powerful accomplishment of humankind (Falk‚2012). During the Ice Age‚ Hominidae first learned of natural fires caused by lightnings and used it to their advantage. Our ancestors capability to start a fire help them survived in the extreme weather during the Ice Age (Ancient History‚2010). The Earth’s temperature during the Ice Age was about -11.1 degrees Celsius
Premium Carbon dioxide Sodium bicarbonate
Unknown 2 Scheme “ Fair game” ions Cations: Na+‚ K+‚ NH4+ ‚ Ca2+‚ Mg(OH2)62+ ‚ Al(OH2)63+ Anions: SO42-‚ HSO4-‚ NO3-‚ OH-‚ Cl-‚ CO32-‚ HCO3- Insoluble Compounds: Ca(OH)2‚ CaSO4•2H2O‚ CaCO3‚ MgCO3‚ Mg(OH)2 I. Describe Sample a. Quick description of sample. Ex: Phase‚ color‚ odor‚ crystalline‚ amorphous‚ gel-like‚ powdery‚ etc. II. Flame Test a. Part 1 i. Orange Flame: Na+ is present. K+ ‚ NH4+ ‚ Ca2+‚ Mg(OH2)62 ‚ Al(OH2)63+ may also be present. ii. Purple Flame: K+ is present (no Na+
Premium Ion Chemistry Atom
Previously‚ Yeoh‚ & Wong (1993) reported the nutritional values of A. gangetica. Ogle et al.‚ 2001 reported the folate composition of A. gangetica. However‚ not much information on the utility of this leafy vegetable has been reported. To the best of our knowledge‚ there is no report on the optimization of polyphenols and their radical scavenging activities from the edible leaves of A. gangetica. Therefore‚ the main aim of this study is to optimize extraction conditions such as EtOH concentration
Premium Sodium Sodium hydroxide Sodium carbonate
Lab 5 DECOMPOSITION (Nov 2‚ 2011) Introduction: Decomposition is the breakdown of organic material into its smaller molecules and elements. (This term is generally considered as a biotic process but one may find it also used to describe an abiotic process‚ e.g.‚ due to weathering.) The decomposing organisms may use the release of elements for nutrients and by breaking apart the carbon-carbon bonds in organic matter this can release energy for them. These smaller molecules and nutrient elements
Premium Oxygen Chemical reaction Nitrogen
better at removing impurities. Experimental For this extraction experiment two bags of tea were used‚ which is approximately 4 grams of tea. Water was heated in a small beaker until it began to boil. It was then removed from heat and 2 grams of Na2CO3 was added and dissolved. Finally the loose tea was added to the water and allowed to steep for 5 minutes. After 5 minutes the mixture was put through a suction filtration. A suction funnel was secured on top of the suction flask with the vacuum
Premium Caffeine Coffee Tea