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102
What occurs when methane is incompletely oxidized in a limited supply of air?
The octet rule states that atoms tend to gain, lose, or share electrons to achieve a stable configuration with eight valence electrons. Phosphorus (P) can sometimes have an expanded octet, meaning it has more than eight valence electrons.
104
The location of transition elements is in between__________________?
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105
In an electrochemical cell, what is the typical position of the element that functions as the anode?
The anode is where oxidation occurs, and it is typically at a higher position or potential in an electrochemical cell to facilitate the flow of electrons.
106
What is the colored glassy mass in the borax bead test indicative of?
In the borax bead test, the colored glassy mass is formed due to the precipitation of a specific compound. The correct term is 'metal metaborate'. A metaborate is a chemical compound containing boron in its +5 oxidation state and is typically formed when a borax (sodium tetraborate) solution reacts with an alkali earth or alkaline earth element. The test helps identify these elements.
107
What process involves extracting a metal in its molten form?
Smelting is a metallurgical process where an ore is heated to high temperatures, typically with a reducing agent, to extract the desired metal in its molten state, separating it from impurities and other elements.
108
The oxidation state of transition elements is usually _______________________?
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Transition metals are characterized by their ability to exhibit multiple oxidation states. Cobalt (Co) is a typical example, as it can exhibit oxidation states ranging from +2 to +3. In contrast, Scandium (Sc), Yttrium (Y), and Cadmium (Cd) do not exhibit this property.
110
Fruit juices and fizzy drinks such as lemonade are often sold in aluminium cans. What is the most important reason aluminium is a suitable metal ?
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