Answer:
A new Dana system of classification contains 78 different classes of minerals based on composition and then further classified by type and group. To be considered a mineral, a substance must be an inorganic, naturally formed solid, with a specific chemical formula and a fixed internal structure. To test whether something is a mineral, there are several identification tests to which the substance is subjected, including its resistance to scratching, its density in comparison to water, its color, the degree of light it reflects, the color of the powdered mineral, its breakage pattern and its crystalline form.
Explanation:
B.) Decomposition
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The answer is C2H2 because an alkyne compound consists of a series of unsaturated hydrocarbons with a triple bond.
Ultraviolet as ultraviolet light waves are around 420 nm like stated in the photo
