Question

question 10
what special properties did calcite have? (select all correct answers).
o it showed two printed images.
o it bubbled with acid.
o it had unique streak color.
o it reflected a lot of light.

Explanation:

Calcite (\(CaCO_3\)) is a common mineral. When calcite reacts with acid (such as hydrochloric acid \(HCl\)), the chemical reaction \(CaCO_3 + 2HCl=CaCl_2 + H_2O+CO_2\uparrow\) occurs, and \(CO_2\) gas is produced, so it will bubble with acid. Also, calcite has the property of double - refraction. When light passes through calcite, it can split into two rays, which can be observed as showing two printed images in some experiments. Calcite has a white or colorless streak (not a unique special - colored streak in a general sense compared to some other minerals like hematite which has a reddish - brown streak). And calcite does not have the property of reflecting a lot of light (minerals like pyrite have a metallic luster and can reflect more light relatively).

Answer:

It showed two printed images.
It bubbled with acid.