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Which combination will produce a precipitate?

The type of reaction that usually produces a precipitate is called a double replacement reaction. Two solutions are required, dissolved in water and containing positively and negatively charged ions, known as cations and anions. By working out the equation of the solutions and their products, the solubility rules can be applied to predict whether or not a particular product that forms is solid.\nFor example, if a solution of magnesium bromide is combined with a solution of silver nitrate, it produces silver bromide and a magnesium nitrate. The rules stipulate that only three salts containing s..

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Why is blue Methylene used in the cheek cell lab?

Cell staining is useful because it enhances visualization of specific components within a cell. Cell staining can also be used to highlight processes, such as the stages in cell division. Methylene blue is specifically used in staining animal cells and blood film. This staining media works by dyeing the nuclei of cells and making the particular structure more visible under a light microscope. Any tissue that can absorb stains and dyes is referred to as chromatic. Without stains, such as methylene blue, cells appear almost transparent under a microscope. The type of stain used determines the te..

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When was hydrogen discovered?

Hydrogen has no odor or color, is low in density and can be found in almost all living things. It's very abundant because of its presence in water. It's commonly used in the chemistry, glass and electronics industry, with some of its uses including filling balloons, making ammonia and hydrogenating oils. The symbol for the element is H, and it has an atomic number of 1. Its melting point is -434.49 degrees Fahrenheit, and its boiling point is -423.182 F.

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How are hydrogen bonds different from covalent and ionic bonds?

A hydrogen bond is formed when a positively polarized hydrogen atom in one molecule is attracted to a highly electronegative atom in another molecule. In the example of water molecules, the negatively charged oxygen atom in one water molecule attracts the positively charged hydrogen atom in another water molecule. Oxygen atoms tend to steal electrons away from the hydrogen atoms within molecules. When this occurs within a water molecule, the electron loss creates a hydrogen atom with a partial positive charge, which is then attracted to a negatively charged oxygen atom in another water molecul..

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What is the weather like in spring?

Besides the weather, several other signs indicate that spring has arrived. Buds form on trees, and vegetation begins to grow again. The number of hours of daylight increases. Animals wake, and birds return from migration. The closer a location is to the equator, the less obvious the signs of changing seasons are. In these areas, winter is sometimes barely different from summer, and spring is barely recognized.

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What are properties in science?

For example, physical properties ascribed to oxygen include its state of matter as a gas at most temperatures, its melting point of minus 361.82 degrees Fahrenheit, its boiling point of minus 297.33 degrees Fahrenheit, its four different oxidation states and its molar heat capacity. More basic properties may include the gold coloring of the metal gold or the squishy texture of the inside of a banana.

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What are the two types of ribosomes?

Ribosomes are small particulates that consist of protein and ribonucleic acid. These particulates play a role in the translation process; the ribosomes translate messenger RNA.\nIf the ribosome is suspended in the cytosol, it is considered a free ribosome. If the ribosome is connected to the endoplasmic reticulum, it is a bound ribosome. They can also be referred to as detached and attached ribosomes, respectively. Both types of ribosomes have similar functions, and it is acceptable to use both terms interchangeably.\nFree ribosomes create proteins within the cytosol, while bound ribosomes cre..

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How does weathering affect limestone?

Limestone is a sedimentary rock created from the remains of dead sea creatures and is predominately made up of calcium carbonate. Many horizontal and vertical cracks run through limestone. These cracks allow water to pass easily through the rock. Water acts as an acid when it contacts calcium carbonate, dissolving the limestone. The dissolved calcium carbonate may drip into underground caves hollowed out from the action of weathering. Sometimes, the calcium carbonate evaporates as it drips from the cave ceiling creating stalactites. If the calcium carbonate drips and evaporates on the ground i..

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What percentage of body weight is muscle?

Knowing one's muscle mass percentage is helpful in maintaining a healthy weight. A person who has a higher muscle mass expends more energy in order to perform movements but may have an easier time achieving movement.\nMost tests to determine percentages of body weight focus on body mass index, or the total fat percentage. For men, 16 percent body fat is considered to be normal, while 27 percent is considered normal for women.

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What is a good topic for an article on global warming?

A more focused article on agriculture and global warming could look at a certain crop, such as rice, and compare its yield in various regions of the world to see how temperatures affect it. While crops grow faster when temperatures are higher, the yield may be lower due to the higher speed of growth. Other possible article topics include investigating the root causes of global warming and the role of carbon dioxide in global warming.

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