CHEMICAL WEATHERING Chemical weathering is a process of alteration of rocks of the Earth’s crust. is a chemical decomposition process. is brought out by atmospheric gases and moisture. End product has a different chemical composition and poorer physical constitution. The process: Chemical change in the nature of rock takes place in the presence of moisture containing many active gases such as CO2‚ N2‚ H2‚ and O2. Rocks are made up of minerals. All the minerals in a rock are not in
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SEMESTER- I PRACTICAL- I VOLUMETRIC ANALYSIS The method to determine the exact amount of the substance in a given sample is termed as quantitative analysis volumetric analysis is a branch of quantitative analysis involving accurate measurement of volumes of reacting solutions. The volumetric analysis is very much in use due to simplicity rapidity accuracy and wide applicability. The reacting substances are taken in the form of solutions and made to react. The concentration of one solution is
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re-ignite (c) hydrogen causes burning splint to produce a pop sound. 2. Sketch a periodic table and label the main regions of the table. See pg 184 3. Draw Bohr diagrams for the following atoms: (a) boron (b) sulphur (c) calcium. [pic] 4. How many protons‚ neutrons‚ and electrons‚ do the following particles have: (a) C‚ (b) Fe‚ (c) Cl-1‚ (d) Ca+2‚ (e) N-3? [pic] 5. Use Bohr diagrams or Lewis dot diagrams to show how an ionic bond forms between sodium and chlorine
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paper Chemistry Notes & Worksheet: Acids‚ Bases & Salt Name : __________________________________________________ ( ) Class : Secondary 3 Maju/Cemerlang Date : ______ August 2012 Acids Definition: Substances that release hydrogen ions (H+) when dissolved in water. Strong Acids | Weak Acids | Chemical Name | Chemical Formula | Organic acids such as citric acid‚ ethanoic acid. | Hydrochloric acid | HCl | | Sulphuric acid | H2SO4 | |
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water to dissolve the sodium carbonate until 250 ml of solution were made. I had to calculate‚ from the information provided‚ how much sodium carbonate to use in the making of the solution. Using the volume and concentration of the solution‚ I was able to calculate the moles of the solution (concentration x volume). Using the periodic table I was able to calculate the molar mass of sodium carbonate which was 106‚ from this I could calculate the mass of the sodium carbonate I needed to make the solution
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water Example any anion + Alkali Ions (Li+‚ Na+‚ K+‚ Rb+‚ Cs+‚ Fr+) = soluble Sodium fluoride‚ NaF‚ is soluble any anion + hydrogen ion [H+ (aq)] = soluble hydrogen chloride‚ HCl‚ is soluble any anion + ammonium ion (NH4) = soluble ammonium chloride‚ NH4Cl‚ is soluble nitrate NO3- + any cation = soluble potassium nitrate‚ KNO3‚ is soluble acetate (CH3COO-) + any cation (except Ag) = soluble sodium acetate‚ CH3COONa‚ is soluble Chloride (Cl-)‚ Bromide (Br-)‚ Iodide (I-) + Ag+
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formula for the carbonate ion? (a) CH3COO(b) Cl(c) CO22(d) CO32(e) (COO-)2 c 2. What is the name of Fe(OH)3? (a) (b) (c) iron hydroxide iron trihydroxide iron (III) hydroxide (d) (e) iron (II) hydroxide none of these d 3. From the following ionic compounds‚ choose the name-formula pair that is not correctly matched. (a) (b) (c) (d) (e) sodium sulfide ammonium nitrate zinc hydroxide sodium sulfate calcium oxide Na2S NH4NO3 Zn(OH)2 Na2SO3 CaO b 4. How many atoms of hydrogen are in 1.00
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HCl(aq) → NaCl(aq) + HCO3(aq) Na2CO3 + 2HCl → 2NaCl + H2O + CO2(aq) 2Na+ + CO32- + 2H+ + 2Cl- → 2Na+ + 2Cl- + H2O + CO2 CO32- + 2H+ → H2O(l) + CO2(g) With this reaction the carbonate and the diatomic hydrogen combined together to make the bubbling effect that we had noted. This leaves us with the water molecule with the sodium chloride dissolved in it with the carbon dioxide gas bubbles. 4. NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l) Na+ + OH- + H+ + Cl- → Na+ + Cl- + H2O(l) OH- + H+ → H2O This reaction
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photosynthesis. The products made in the light independent stage of photosynthesis are NADP+ and ADP. Apparatus 1 Lamp 6 Green aquatic plant (Elodea) 1 500ml Beaker 1 Thermometer 110°C ±0.5 1 Metre ruler ±0.5 1 Test tube 50g Sodium hydrogen carbonate 1 Funnel 1 Stopwatch 1 water bath Independent variable Distance between plant and light bulb affecting the light intensity Dependant variable Number of oxygen bubbles of oxygen produced as a bi-product of photosynthesis.
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Chemical decomposition can be defined as the separation of chemical compounds into smaller‚ simpler compounds (New World Encyclopedia‚ 2009). It is often considered an undesirable outcome of a chemical reaction. Radiation‚ humidity‚ heat‚ and acidity affect the stability of chemical compounds. Molecules‚ when put under harsh environmental conditions may break up into smaller particles. Decomposition can also be defined as the breakdown of one phase into two or more phases. Thermal‚ electrolytic‚
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