Chemistry

A:

Elements become denser toward the bottom of the periodic table. From left to right on the table, elements become denser toward the center of the table and less dense on either end.

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  • Which property of water is demonstrated when we sweat?

    Q: Which property of water is demonstrated when we sweat?

    A: Sweating in humans demonstrates water’s tendency to absorb heat by overcoming the hydrogen bonds that hold its molecules together. This property makes it possible for humans to stay cool via sweating, because water requires immense levels of energy to evaporate.
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  • What are some common ionic compounds that are used in everyday life?

    Q: What are some common ionic compounds that are used in everyday life?

    A: One of the more common ionic compounds that is used often is baking soda. Baking soda is also known as bicarbonate or hydrogen carbonate.
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  • What are the uses of copper?

    Q: What are the uses of copper?

    A: Copper is commonly used in construction, electrical wiring, plumbing and the manufacture of vehicles. It is also used to make parts for fixtures in homes.
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  • What is sodium bisulfate?

    Q: What is sodium bisulfate?

    A: Sodium bisulfate is a dry acid often used as a fungicide, herbicide, pH adjuster or microbiocidein. It comes in a variety of consistencies, such as a powder, granular or crystal form, and is commonly found in metal finishing and swimming pool and household cleaning products.
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  • What are examples of solids, liquids and gases?

    Q: What are examples of solids, liquids and gases?

    A: An easy example of a solid, liquid and gas is ice, water and water vapor. Solid, liquid and gas are the three main forms that matter can exist in. Solid water is ice, liquid water is water and gaseous water is water vapor.
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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 smells attract men?

    Q: What smells attract men?

    A: Men are attracted to scents like vanilla, sandalwood and lavender. These fragrances have relaxing properties that also make people feel especially drawn to each other.
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  • Where does air come from?

    Q: Where does air come from?

    A: Oxygen is one of the primary components that allows air to be breathable to people and it began forming in the atmosphere approximately one billion years ago. Until the ozone layer formed, most life on the planet was restricted to the oceans.
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  • What is the difference between hard and soft water?

    Q: What is the difference between hard and soft water?

    A: Chemically, the difference between the two is that hard water contains calcium and magnesium ions, while soft water does not. Soft water is easier to lather with than hard water is.
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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 reaction between chalk and vinegar?

    Q: What is the reaction between chalk and vinegar?

    A: The reaction between chalk and vinegar is a neutralization reaction between calcium carbonate and acetic acid to produce water, carbon dioxide and calcium acetate. Carbon dioxide is a gas that causes the reaction to bubble.
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  • Is neon a metal or a non-metal?

    Q: Is neon a metal or a non-metal?

    A: According to the Encyclopedia Britannica, neon is a gas, not a metal. The source states that it is an inert gas and is one of the noble gases in the periodic table.
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  • How does oil form?

    Q: How does oil form?

    A: Existing oil was formed from the remains of microscopic plants and animals that died in the ocean between 10 and 600 million years ago. When these organisms died, they became buried in the mud and sand at the bottom of the sea. Over millions of years, sedimentary layers of decayed organisms were formed.
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  • What makes rubber expand?

    Q: What makes rubber expand?

    A: According to Elmhurst College, rubber can expand because the molecules inside it are coiled up like a spring. Those molecules can then be expanded or compressed, giving rubber its characteristic elasticity.
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  • Are elements named after people?

    Q: Are elements named after people?

    A: Many different elements are named after people. Some are named after the scientist who discovered the element, while others are named in honor of a famous or noteworthy person.
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  • What are properties in science?

    Q: What are properties in science?

    A: In chemistry, the term "property" is frequently used to describe the attributes of a substance, such as density, oxidation, state of matter, mass, conductivity, color, bonding and many other traits. These properties are used to understand how a substance behaves in different situations.
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  • Where is nitrogen found throughout nature?

    Q: Where is nitrogen found throughout nature?

    A: Nitrogen can be found in all living organisms on Earth while also being present in soil, water and air. It is an important component in biological compounds found all throughout nature.
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  • What are some uses of hydrogen?

    Q: What are some uses of hydrogen?

    A: Hydrogen is used to manufacture the important chemical compounds ammonia and methanol, according to the Essential Chemical Industry. It is also used in such oil refinery processes as reforming, in which sulfur compounds are removed from petroleum to improve the petroleum's quality.
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  • What is the composition of stainless steel?

    Q: What is the composition of stainless steel?

    A: Stainless steel is available in many different alloys that incorporate several different elements, but the essential components are iron, carbon and chromium. Low-carbon steel with at least 12-percent chromium forms an even layer of protective oxide on its surface and is, therefore, stainless.
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  • What is the density of rubber?

    Q: What is the density of rubber?

    A: The density of rubber is dependent upon the kind of rubber; hard rubber has a density of 74 lb/foot cubed, while soft commercial rubber has a density of 69 lb/foot cubed and pure gum rubber has a density of 57-58 lb/foot cubed. The term "rubber" has had many meanings over the years, including as a reference to a horse towel in 1598 and a polished brick in 1744 before it came to mean the elastic substance used today.
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  • What is the difference between salt and sugar crystals?

    Q: What is the difference between salt and sugar crystals?

    A: Sugar and salt crystals are made of entirely different elements and have very different chemical and physical properties. While both dissolve readily in water, they dissolve in different ways, and unlike sugar, the dissolution of salt is largely unaffected by temperature. Their greatest similarities are in their common appearance as small white crystals and their use in the preparation and flavoring of food.
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