Question 7 (1 point) When testing calcite versus dolomite with weak HCl, calcite

Question

Question 7 (1 point) When testing calcite versus dolomite with weak HCl, calcite will react easily and produce effervescence whereas dolomite will not. Which answer described these reactions most accurately? Dolomite is not a carbonate and is nonreactive. Calcite is more soluble than dolomite Dolomite has a very different crystal structure which makes it less reactive. Dolomite requires twice as much acid to cause a reaction similar reaction to calcite. Calcite is much softer than dolomite so it will react more easily.

Explanation / Answer

Dolomite is very similar to the mineral calcite.Calcite is composed of calcium carbonate, while dolomite is a calcium magnesium carbonate. While testing with HCl acid,calcite will react easily and produce effervescence whereas dolomite will not.Because calcite is more soluble than dolomite.   

Sulfate minerals are delicate and occur near the Earth's surface in sedimentary rocks.Gypsum is a sulfate mineral.It is the standard for Hardness degree 2 on the Mohs mineral hardiness scale.Gypsum would be easy to identify based on its hardness property.Your fingernail will scratch this clear,white to gold or brown mineral-that's the simplest way to identify gypsum.

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