Barium and strontium belong to the alkali earth metals. <>
Instrumental methods of analysis are faster, and more accurate and more sensitive than simple chemical tests. The flame held the same characteristics as the Lithium and Barium solutions.
$.' Because each alkali metal gives off a different color when chemically reacting with heat ( and/ or fire), it can be used to identify certain metal samples that are found at a crime scene. http://www.cengagesites.com/academic/assets/sites/4827/advancedchapter3.pdf, http://www.youtube.com/watch?v=Y1LMYP-lJJY, http://www.teachertube.com/viewVideo.php?video_id=215277. x��XMo�6��`o�!��-A��ٴ)6�-�6{Pd%�X^[�v�}gH�&%K�Z$�$�3|3||rr����4����亮�l�/ȗɼZ��������X�uQ�&����~��E���"7�3r3? Another element that may produce a similar color is rubidium. To demonstrate and classify the characteristics of a chemical reaction. ?��QB����Q�%RE�詌DB�o�g1yů_�Ͼ$�J濟�} �o�g�o�[�8!B�H
m1'�O����\�ۊ@��aF��3�~��ߒ�C��)��E�Η�L�r2��j��:�:���z��i4m9$CN�����1�"�\�ᐙ��O@�@L �hC��J��> In the flame test lab, the flames were different colors at different times, and we used a spectrascope to see the color of the flame that alligned with a number that illustrated the flame's spectrum. It is a crimson red color due to the transition between electron levels. In this classic science experiment, students report on the colours produced when flame tests are carried out on different metal salts. endobj
Make up a solution of saturated calcium acetate (NB – MUST be saturated!) Change of color is emitted when chemical change takes place in the flame test. The catalyst in these chemical reactions was heat. 50 mL of 1.0M Calcium Chloride (CaCl 2) 50 mL of 1.0M Copper Chloride (CuCl 2) 50 mL of 1.0M Lithium Chloride (LiCl) 50 mL of 1.0M Potassium Chloride (KCl) 50 mL of 1.0M Sodium Chloride (NaCl) 50 mL of 1.0M Strontium Chloride (SrCl 2) Lithium, sodium and potassium belong to the alkali metals. As stated by the Forensic Chemistry site, " Forensic investigators consult a wide range of experts who analyze evidence collected at crime scenes and brought to the crime laboratory for examination" ("Forensic Chemistry", par. 7 0 obj
endstream
It's possible to get a vivid hot pink color, although more muted colors are also possible. Flame Colours – Technician’s Notes Advance Preparation Chemicals Calcium acetate Lithium chloride (LiCl) Copper(II) chloride (CuCl 2) Sodium chloride (NaCl) Equipment 3 x Spray bottles Preparation Instructions 1. 50 mL of 1.0M Barium Chloride (BaCl 2) - Note: Barium chloride is highly toxic. Lithium chloride is also used as a flame colorant to produce dark red flames. Do not ingest the salt or solution. When it merged with the fire the fire turned a light green color. When the electrons “fall back” to their lower level, they emit light at a characteristic color of each element. %PDF-1.5
���� JFIF ` ` �� C %����
It is often used to point out polymers because they give off unique burn marks. Because each alkali metal gives off a different color when chemically reacting with heat ( and/ or fire), it can be used to identify certain metal samples that are found at a crime scene. There are highly specialized teams of Forensic Scientist that test either, fingerprinting, human remains, firearms, explosives and so on. <>
2. The flame test is used to visually determine the identity of an unknown metal of an ionic salt based on the characteristic color the salt turns the flame of a bunsen burner. The flame turned a red/ pink color when coming in contact with this solution. The flame heating promotes the electrons to a higher level. This solution caused the flame to turn the color yellow. PURPOSE: ... Lithium emmited the least energy because according to the electromagnetic spectrum, dark reds, oranges, and yellows have a high wavelength, but low energy, and Lithium nitrate burned a dark red. endobj
<>
~���i�� �1��}��Bk}>�?��X�xFt�e��{���hd�;VaG����C`�a�X����
{��}d��٣�h�=����G�f�FI�=C� stream
endobj
<>
Yes, because they exist in the same category as the other element that has the same color. This flame was the same pink/red color as the lithium chloride. <>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 595.38 841.98] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>>
5 0 obj
lithium chloride is red in colour ref: http://eip.k20center.org/wp-content/uploads/flame-test-teacher1.doc