Chemistry

A:

Pure limestone is made up of two component minerals: calcium carbonate and calcium-magnesium carbonate. The chemical formula for calcium carbonate is CaCO3. The chemical formula for calcium-magnesium carbonate is CaMg(CO3)2.

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  • What are the ingredients in fireworks?

    Q: What are the ingredients in fireworks?

    A: Invented in China, fireworks are composed of a variety of ingredients, including aluminum, Vaseline and gunpowder. The gunpowder inside each firework creates pressure in gas that is trapped inside a tube or mortar, which gives each rocket its lift.
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  • What are the properties of cast iron?

    Q: What are the properties of cast iron?

    A: Cast iron is brittle, hard and more fusible than steel. It is also nonmalleable, which means that it cannot be stretched, hammered or bent into shape. Its has a crystalline structure, and it is weak in tension.
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  • What happens when iron reacts with oxygen?

    Q: What happens when iron reacts with oxygen?

    A: Iron rusts when it comes in contact with oxygen and water. It rusts faster in acid rain and salty water. Both oxygen and water are necessary for rusting, which is an oxidation reaction.
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  • What happens when iron reacts with vinegar?

    Q: What happens when iron reacts with vinegar?

    A: When iron reacts with vinegar, the metal rusts and causes an exothermic chemical reaction, which produces heat. This is commonly reproduced in experiments with either an iron nail or steel wool and vinegar.
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  • Where is radium found in nature?

    Q: Where is radium found in nature?

    A: Radium can be found in the carnotite sands of Colorado. Greater amounts can be found in a region of Canada known as the Great Bear Lake. Radium can also be found in large amounts in some African countries, such as Zaire.
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  • What is an example of a chemical reaction?

    Q: What is an example of a chemical reaction?

    A: A chemical reaction occurs when a cake bakes. The materials in the batter are changed into a different substance. If the cake burns, that is a separate chemical reaction. In fact, any type of burning, such as a piece of paper or a stick of wood, is a chemical reaction.
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  • What are the steps of the nitrogen cycle?

    Q: What are the steps of the nitrogen cycle?

    A: The steps of the nitrogen cycle are nitrogen fixation, nitrification, ammonifcation and denitrification. During the first step, nitrogen fixation, special bacteria convert nitrogen gas into ammonia which is used by plants. The second step, nitrification, involves converting ammonia into nitrite ions that are taken by plants as nutrients.
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  • How do matches work?

    Q: How do matches work?

    A: Match heads contain phosphorus, potassium chlorate and sulfur, and when heated by friction, the phosphorus ignites, causing the other two materials to burn. When ignited, the potassium chlorate produces oxygen in amounts far exceeding what is typically found in the surrounding air. The oxygen and sulfur mixture burns steadily, igniting the matchstick to produce a usable flame.
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  • Is water an element, compound or mixture?

    Q: Is water an element, compound or mixture?

    A: Water is a compound made of two atoms of hydrogen and one atom of oxygen. The hydrogen atoms are bonded to the oxygen atom by the sharing of electrons, called a covalent bond.
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  • How do you make magnesium sulphate?

    Q: How do you make magnesium sulphate?

    A: Magnesium sulfate crystals can be prepared from Epsom salt available in pharmacies. Natural magnesium sulfate exists as the mineral kieserite, MgSO4?H2O, which is purified by crystallization.
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  • What are examples of alkaline substances?

    Q: What are examples of alkaline substances?

    A: Lye, baking soda and ammonia are examples of common alkaline substances. The word alkaline describes a water-based solution with a pH above 7.0.
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  • What does "solvent" mean in science?

    Q: What does "solvent" mean in science?

    A: A solvent is the prominent component of a homogenous mixture or solution made of two combined materials. A solution is made when a lesser amount of material called a solute is dissolved into the solvent.
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  • How was the proton discovered?

    Q: How was the proton discovered?

    A: The proton was discovered by Ernest Rutherford through the gold foil experiment, says the Purdue University College of Science. The results of the experiment led Rutherford to conclude that the positive charge and the mass of an atom are concentrated in a tiny fraction of the overall volume. In 1920, Rutherford proposed that the positively charged particle in an atom’s nucleus be called a proton.
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  • What does hydrochloric acid do?

    Q: What does hydrochloric acid do?

    A: Hydrochloric acid does many different things, finding use in both the home and factories. Hydrochloric acid is an aqueous solution of hydrogen chloride. Muriatic is a common name for this highly corrosive mineral acid.
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  • What things are made out of copper?

    Q: What things are made out of copper?

    A: Things that are made of copper include alloys, pipes, wires, coins, electronics and poisons. It is also a key element in creating bronze and brass.
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  • What did Louis Pasteur do?

    Q: What did Louis Pasteur do?

    A: Louis Pasteur was a scientist who developed important vaccines and came up with the process of pasteurization for foods. He is credited with discoveries that laid the foundation for the study of microbiology and modern medicine.
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  • What is the use of chloroxylenol in Dettol antiseptic liquid?

    Q: What is the use of chloroxylenol in Dettol antiseptic liquid?

    A: The chloroxylenol in Dettol is an antimicrobial disinfectant used to kill bacteria and to prevent infections on minor scrapes, cuts or burns. The substance is commonly found in antibacterial soaps, but it is also used to control bacteria, algae and fungi on industrial surfaces where clean facilities are needed. Some liquids that contain chloroxylenol must be diluted before application on the human body.
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  • What is the most reactive metal in the periodic table?

    Q: What is the most reactive metal in the periodic table?

    A: The most reactive metal in the periodic table is francium. Francium belongs to the alkali metals, a group on the periodic table whose members are all highly reactive. These metals are highly reactive because they all have only one valence electron.
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  • What is the lethal dose of radiation?

    Q: What is the lethal dose of radiation?

    A: According to the United States Nuclear Regulatory Commission, the lethal dose of radiation is in the range of 400 to 450 rem. This level of radiation causes death to around 50 percent of a population that has been exposed over a period of 30 days.
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  • What is silicone made of?

    Q: What is silicone made of?

    A: Silicone is made of a chain of alternating silicon and oxygen atoms with two other atoms or compounds bonded to each silicon atom. Its structure is somewhat similar to a hydrocarbon chain, in part because of silicon being part of the same periodic group. However, bonds between silicon atoms, unlike bonds between carbon atoms, are unstable. Silicone, on the other hand, is very stable and resists both heat and chemicals.
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  • What substances act as natural buffers?

    Q: What substances act as natural buffers?

    A: According to a 1963 study at Harvard University, carbon dioxide, bicarbonate and carbonate act as buffers to fluctuating hydrogen ion concentrations in natural sources of unprocessed water, helping the water maintain a relatively constant pH. Since the concentrations of buffer chemicals are low, outside forces also influence water pH.
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