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What is a neutral atom?

Protons have a positive charge, while electrons have a negative charge. Ions are electrically charged atoms, having a negative charge if they gained an electron and a positive charge if they lost an electron. The chemical and physical properties of an atom change as ions are created. When two ions with opposite charges come into contact, they are attracted to each other. They may begin to share electrons in either covalent or electrovalent bonds.

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Who created the metric system?

The basic concept of the metric system adopted the idea of a system of measurement that is based on decimals and expressed using multiples of 10. The metric system was temporarily abolished between 1812 and 1840 in France by Napoleon. Adoption in other countries had begun during that time, typically following a period of political upheaval.

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How do geysers erupt?

Geysers tend to occur in geologically active areas, especially those near active volcanoes. Each geyser requires a regular supply of water to refill its reservoir, access to magma a few miles below to provide the necessary heat, and a specific geological construction in order to build up the pressure necessary for eruption. The cone-shaped structure maintains pressure as the water heats, increasing the boiling point and ensuring a massive explosion once the pressure is relieved. Without this overpressure, a heated reservoir may simply turn into a hot spring.\nYellowstone Park in Wyoming is hom..

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What does supernova mean?

Toward the end of their lives, massive stars run out of hydrogen to convert into helium. These stars then start forming more massive elements such as carbon and oxygen from the helium. In its final days, a massive star turns silicon into iron. This type of fusion reaction causes a star to collapse. The star then ejects its outer portions in a spectacle of light and energy called a supernova. A supernova produces light many times brighter than the star ever had.

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Why does litmus paper change colors?

Solutions with pH levels below seven are considered acidic. Those with pH levels at seven are considered neutral. Litmus paper is paper that has been treated with a mixture of natural dyes known as lichens, or Roccella tinctoria.\nLitmus paper is not the only method of using color change to detect pH level. One natural way to do so is to use red cabbage juice. It appears red in acidic solutions, blue in neutral ones and greenish-yellow is base solution with pH levels at 12.

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How do astronomers predict planetary alignment?

The planets of the solar system are split into two groups. The planets between the Sun and the Earth are inferior planets. The planets that lay past the Earth are called the superior planets. When inferior planets align, the occurrence is described as a conjunction. When it involves superior planets, it's called opposition. Universe Today states that a complete alignment involves all of the planets, both inferior and superior, creating a single line.

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What should be in an earthquake survival kit?

A basic supply kit should contain enough food and water for everyone in the home. The CDC recommends 1 gallon of water per person per day and a supply of non-perishable food that can be eaten without cooking. Crackers, peanut butter and canned fruit are examples of items that can be eaten with little or no preparation. A can opener and dry pet food, where appropriate, should also be stored with the emergency food supplies. Rotate food supplies every season to ensure they do not expire before being consumed.\nHydrogen peroxide, rubbing alcohol, a variety of bandages and over-the-counter fever r..

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What is the thing that hangs down in your throat?

A uvula may help prevent food from entering the sinus cavity while a person eats, and it may assist with speech. An elongated uvula can restrict airflow when sleeping, which can cause a person to snore or cause sleep apnea when the muscles in the back of the throat relax — resulting in the soft palate and uvula partially blocking a person's airway.

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Why does the right lung have three lobes?

The left lung has a cardiac impression to make room for the heart. Some scientists believe that the left lung once had a third lobe, but it was lost over time.\nThe right lung not only has more lobes than the left, but it's larger, heavier and has more capacity. It's separated into the superior, middle and inferior lobes. These lobes in turn are separated from each other by the upper and lower fissures. The upper and lower lobes are about the same shape and size as the lobes of the left lung. The middle lobe, which only the right lung has, is the smallest of the three.\nThe right lun..

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What chemicals are used in Zyrtec D?

Antihistamines work to reduce the effects of the body's immune system in terms of the production of histamine, which is created in response to substances the body identifies as foreign and potentially dangerous. Excess histamine leads to symptoms such as rashes, swelling, itchy membranes, sneezing and the excess production of fluids, such as tears and mucus. Therefore, reducing the amount of histamine in the system helps to combat these symptoms.\nDecongestants such as pseudoephedrine work by narrowing the blood vessels in the nose to decrease stuffiness, swelling and congestion. This ena..

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