have‚ group 1 has 1 valence electron. When group one elements become ions what are is their charge‚ their charge is +1. What are the group 2 elements called‚ they are called the alkali earth metals. List the group 2 elements‚ the group 2 elements are Beryllium‚ Manganese‚ Calcium‚ Strontium‚ Barium‚ and Radon. How many valence electrons does group two have‚ group two has 2 valence electrons. When group two elements become ions what is their charge‚ their charge is +2. What are the group 17 elements
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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+
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An Introduction to Qualitative Analysis Purpose: Tests the ions of Mg2+‚ Ca2+‚ Sr2+‚ and Ba2+‚ and identify them separately. By using these observations‚ identify the unknown ion. Then tests the ions of SO42-‚ CO32-‚ Cl-‚ and I-‚identify them separately‚ and use the observation to identify the unknown. Procedure Part I - Qualitative Analysis of Group 2 Elements Mix 0.02M K2CrO4 with each Mg(NO3)2‚ Ca(NO3)2‚ Sr(NO3)2 and Ba(NO3)2 together. Secondly‚ mix 0.1M (NH4)2C2O4 instead
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way is iodine; it produces a purple vapor that interacts with a component of the fingerprint to reveal a print. Also‚ ninydrin‚ which reacts with amino acids in the print to form a blue purple color. Silver nitrate is another example; the chloride ion of salt will react with silver nitrate to produce silver chloride. Silver chloride is colorless‚ but can be seen with an ultra violent as a black or reddish color. The last one is super glue; it can be heated in an enclosed area that contains the evidence
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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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Date: 12 March 2014 INTRODUCTION Sodium hexanitrocobaltate (III) is a coordination complex which has the formula Na3[Co(NO2)6]. This compound is yellow in colour. It consists of a central Co3+ ion surrounded by six nitro ligands [1]. This compound is used as a qualitative test for potassium and ammonium ions (so long as certain other cations are not present) [1]. Potassium and ammonium are insoluble in water‚ while sodium is [1]. Hence‚ the potassium and ammonium salts are precipitated as a yellow
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object again it will do the same thing until it can get past the object. 2. Describe the mechanism of movement in Paramecium based on fluxes of calcium in cilia. When the calcium channels open up and allow the influx of calcium ions into the cell‚ the increase the calcium ions causes the reversal of the cilia and the paramecium starts to swim backwards. 3. How do paramecia react to each cation solution? Did you noticed differences in direction‚ duration or frequency of their movement? Explain the
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Figure 1: Schematic illustration of the principle of Biacore SPR to measure the interaction between analyte molecules in the flow with immobilized receptor binding sites on the surface. A) SPR uses an optical method to measure changes in the refractive index near the surface of a thin gold film on a glass slide. At a critical angle of incident light on the surface-solution interface an electromagnetic field or evanescent wave is generated. This is detected as absorption of light and a decrease in
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Flame Test Lab Question: When a compound is placed in the flame of a burner‚ what happens to the color of the flame? Hypothesis: When the compound is placed in the flame‚ the flame changes color depending on the chemical compound. When they’re heated‚ they gain energy and changed color sometimes. Safety Requirements for this Lab: Wear goggles at all times. If you want to remove them to write in your notebook you may sit at a table in the center of the room. When you sit down remove them
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thus indicating living cells. However‚ if it stays blue it doesn’t mean that the cell is dead - the enzymes could be inactive/denatured. Methylene blue can inhibit the respiration of the yeast as it picks up hydrogen ions made during the process. The yeast cell cannot then use those ions to release
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