for me to become familiar with the separation of mixtures and solids and to learn separation techniques based on the chemical properties of a substance. PROCEDURE: Before beginning‚ I set up a data table to record data from the experiment. 1. Separating out the Iron a) I used my digital scale to determine the mass of my weighing dish. b) I emptied the entire mixture of solids from the plastic bag into the weighing dish and determined the gross mass of the total mixture and weighing dish. Then‚
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Mixing of two solutions. 55 Class IX EXPERIMENT No: 9 AIM: To study the external features of root‚ stem‚ leaf and flower of monocot and dicot plants. Material Required : Plants of Hibiscus/Peturnia/rose/pea and grass/maize/bamboo/lily or‚ any other ornamental herb with flower and fruits‚ simple or dissecting microscope‚ hand lens‚ slide‚ coverslip and razor /blade. Procedure : 1. 2. 3. Observe the differences in the external features of stem‚ leaf‚ root‚ flowers and seeds. To study the leaf‚ see
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such a way that they attain an outer shell containing eight electrons. The factors that effect the formation of ions are ionization energy‚ electron affinity‚ lattice energy. Figure 1 The transfer of electrons involved in the formation of (a) sodium chloride and (b) calcium fluoride. Each atom forms an ion with an outer shell containing eight electrons. For many elements‚ compounds cannot be formed by the production of ions‚ since the energy released in the formation of the lattice of ions would
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|b. |sulfur(IV) oxide |d. |sulfur oxide | ____ 30. Name the compound CCl4 using the Stock system. |a. |carbon(IV) chloride |c. |carbon chloride | |b. |carbon tetrachloride |d. |carbon hypochlorite | ____ 31. Name the compound H2O
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beaker. 9. Add another 15 mL of H20 to the mixture in the evaporating dish and stir gently. Decant the liquid again into the beaker making sure not to transfer any of the solid into the beaker to extract NaCl. 10. Place beaker with sodium chloride solution onto heat plate and heat until water evaporates. Remove from heat and allow to cool. Weigh beaker. Difference between this weight and the weight of the empty beaker is the amount of NaCL in the mixture. 11. Take evaporating dish
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PAHANG TRIAL 2009 EXAMINATION CHEMISTRY PAPER 2 MARKING SCHEMES SECTION A - Structural Questions: Question 1. (a) (i) The presence of isotopes 1M (ii) Let the abundance of 63X be a %. The % abundance of 65X. = ( 100 – a ) 1M Relative atomic mass = ( 62.93 x a) + ( 64.93 x ( 100 -a) ) 1M
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the droplet would also confirm the presence of carbonate anions. Silver nitrate was to be added to chloride solution and the
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are needed for the bones. There are other minerals such as fluoride‚ which is important for the teeth as well as the bones. Then there is iodine‚ which is needed for the synthesis of the thyroid hormones. The other sources of minerals are zinc‚ which is needed for many enzymes and the activity of the numbers of vitamins and hormones. Others are sodium‚ chloride and potassium‚ which are electrolytes‚ which are good for regulating blood pressure. Water is considered a macronutrient. This macronutrient
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Chapter 7 Matching Match each item with the correct statement below. a. halide ion e. valence electron b. octet rule f. coordination number c. ionic bond g. metallic bond d. electron dot structure ____ 1. an electron in the highest occupied energy level of an atom ____ 2. Atoms react so as to acquire the stable electron structure of a noble gas. ____ 3. a depiction of valence electrons around the symbol of an element ____ 4. an anion of chlorine or other halogen ____ 5. the force of attraction
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Observe whether 0.1 M iron (III) chloride solution or iron (II) sulfate decolorize when added to 0.1 M potassium permanganate. 5. Add drops of potassium permanganate to the solution that changed color in the previous step. Record how many drops were added until the purple color of the ion no longer changed. 6. Observe color changes when sodium iodide solution is reacted with chlorine water and bromine water (separately). 7. Observe color changes when sodium bromide solution is reacted
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