are chalk and limestone the same substance?
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Chalk is a soft, white, porous, sedimentary carbonate rock, a form of limestone composed of the mineral calcite. ... It forms under reasonably deep marine conditions from the gradual accumulation of minute calcite shells (coccoliths) shed from micro-organisms called coccolithophores.
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Marble is a rock resulting from metamorphism of sedimentary carbonate rocks, most commonly limestone or dolomite rock. Metamorphism causes variable recrystallization of the original carbonate mineral grains. The resulting marble rock is typically composed of an interlocking mosaic of carbonate crystals.
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A purely chemical sedimentary limestone – termed “calcium carbonate” – would contain no fossil remnants, where as, organic limestone would contain fossils. The ingredients of limestone (Ca, C, O) can be dissolved in water, and then combine as either a precipitate or evaporate to create chemical limestone.
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There are various physical properties of Chalk like Hardness, Grain Size, Fracture, Streak, Porosity, Luster, Strength etc which defines it. The physical properties of Chalk rock are vital in determining its Chalk Texture and Chalk Uses.
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Coccoliths are composed of calcium carbonate as the mineral calcite and are the main constituent of chalk deposits such as the white cliffs of Dover (deposited in Cretaceous times), in which they were first described by Henry Clifton Sorby in 1861.
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The difference between talc and calcium carbonate: Calcium carbonate is generally granular, so its stiffness and other aspects than talcum powder, but its price is low, and high whiteness, while the impact toughness of small plastic.
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Marble is composed primarily of calcite, dolomite, or perhaps serpentine. The chemical composition of marble is composed of the following major constituents: 38–42% Lime (CaO), 20–25% Silica (SiO2), 2–4% Alumina (Al2O3), 1.5–2.5% oxides (NaO and MgO), and 30–32% (MgCO3 and others).
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Identification. The chemical formula for magnesium carbonate is MgCO3. It is slightly alkaline, rather than acidic.
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Chalk doesnot dissolve in water. Chalk comprises CaCO3 which is insoluble in water because the forces of attraction between calcium and carbonate ions are stronger than ions of calcium carbonate and water.
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Vinegar is an acid and calcium carbonate (limestone) does indeed dissolve in acids. So, a largely limestone based sand might dissolve a bit in vinegar.
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Remember that magnesium stearate is a salt, containing approximately 96% stearic acid, which is a saturated fat. The other 4% is magnesium. Chalks are combinations of minerals, but magnesium stearate is mostly saturated fat.
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Sandstone is a clastic sedimentary rock that forms from the cementing together of sand sized grains forming a solid rock. ... Limestone is the most abundant of the non-clastic sedimentary rocks. Limestone is produced from the mineral calcite (calcium carbonate) and sediment.
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The major carbonate of calcium is calcium carbonate and calcium bicarbonate. The main difference between calcium carbonate and calcium bicarbonate is that the calcium carbonate molecule consists of Ca, C and O chemical elements whereas the calcium bicarbonate consists of Ca, C, O, and H chemical elements.
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Chemical Equation CaCO3 + 2CH3COOH = Ca(CH3COO)2 + H2O + CO2. Limestone (CaCO3) combined with vinegar (2CH3COOH ) yields calcium acetate Ca(CH3COO)2, water (H20) and carbon dioxide (CO2).
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Chalk is made of limestone or gypsum and compressed into powdered sticks. Soft pastels are made from pure mineral pigments. The same pigments are used in oil paint, acrylics, and water color. ... Pastels are usually combined with a binder such as gum traganth and some water.
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Limestone is a common chemical sedimentary rock. It is generally light in color and composed from calcium carbonate-rich minerals including calcite and aragonite. Its presence in rocks can be detected by dropping acid on a sample of rock and looking for any signs of bubbling.
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Explanation: In the given options, marble, limestone, and baking soda are all either metal carbonates or bicarbonates. All these when react with a dilute acid then they produce carbon dioxide. Whereas lime which is calcium oxide when react with a dilute acid then they do not produce carbon dioxide.