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What is the difference between a mixture and a compound?

A mixture involves the physical combination of substances. The substances can be combined in any ratio to form the mixture, and the individual substances retain their chemical properties.\nA compound requires a chemical reaction between two or more substances and the compound formed has different chemical properties compared to the individual substances that were initially combined. Unlike mixtures, compounds can only be formed if the substances are combined in certain fixed ratios.\nMixtures are easy to separate to their individual components through physical means such as evaporation, filtra..

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What is the period of oscillation?

The amount of time it takes for a period to occur depends on the object that is completing the motion. The size of the object has a direct influence on the time it takes for a period to complete as well as the speed of the oscillation. Frequency is then used to describe the rate at which the object completes these oscillations. For example, the minute hand of a clock completes one oscillation every sixty seconds, so it has a frequency of one oscillation per minute.

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What are some downsides of using plastic shopping bags?

Plastic bags often clog waterways and damage ecosystems; many end up in oceans where birds and marine animals ingest them when they mistake them for food. Thousands of animals die each year after ingesting or choking on plastic bags, confirms About News. In a standard landfill, plastic bags can take more than 1,000 years to break down, but they only become smaller plastic pieces that continue to pollute soil and water.\nMany plastic shopping bags are created using non-renewable petroleum, and 12 million oil barrels are required to make 100 billion bags, according to Factory Direct Promos. Alth..

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Why did Mount Pinatubo erupt?

Before the eruption in 1991, the Volcano had been largely inactive for 500 years. On July 16, 1990, there was a earthquake of magnitude 7.8 that occurred 60 miles from the volcano that disturbed the Earth’s crust beneath Pinatubo. Although this earthquake caused smaller earthquakes and landslides near the volcano, it did not appear as though these events had significantly agitated the volcano.\nThe first magma that started rising to the surface in March 1991 lost most of its gas content on the way up. So, when it reached the surface, it just slowly oozed out and fell down the volcano's ..

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How do homologous structures support evolution?

Originally, scientists grouped animals based on their overall physical similarity. This means that bats were considered to be close relatives of insects and birds, as all of the animals fly. However, as modern DNA techniques have verified, bats are not related to insects and birds, but instead, they are mammals that are related to rodents. Their wings evolved from the same bones that the wings of birds evolved from — the hand and arm bones that their ancestors possessed.\nThe fact that the arms of raccoons, the wings of birds and the fins of whales are all similar in design demonstrates that..

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What is the pH of deionized water?

Deionized water is pure. Therefore it tends to pick impurities, such as carbon dioxide, fast from the atmosphere. When this happens, the pH of water falls. Deionization systems do not remove molecular material from the product water, such as sugar and other organic matter. However, most of them have an activated charcoal column that removes such material.

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What is a pond ecosystem?

The abiotic components are formed by the mixtures of organic and inorganic materials. Basic abiotic components are water, oxygen, calcium, carbon dioxide, salts and nitrogen. Many organisms get their nourishment from the abiotic components.\nBiotic components of a pond ecosystem include producers, consumers and decomposers. The producers consist of macrophytes and phytoplanktons. The consumers are heterotrophs, meaning they depend on other organisms for their nutrients. Most decomposers are saprophytes, but some are parasites.

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What makes an antacid tablet dissolve?

The components of antacid tablets include aspirin, sodium bicarbonate and citric acid. As they dissolve and neutralize stomach acids, they raise pH level in the stomach to between 3 and 4 providing rapid pain relief from gastric reflux. The higher the temperature of the polar solvent, the higher the chemical activity of the reaction, and consequently, the more rapidly the antacid tablet dissolves. A more acidic solvent has a larger concentration of free hydrogen ions that readily react with the basic ions from tablet dissolution. This abundance of hydrogen ions makes it easier for the basic io..

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What are clouds made of?

Heat from the sun causes water to evaporate. Once the evaporated water, called water vapor, reaches higher altitudes where temperatures are cooler, it becomes liquid water again. At even higher altitudes, the air becomes colder, and ice crystals form instead of liquid water. Clouds form when the water droplets or ice crystals become large enough to be seen.\nDroplets and ice crystals move and bump into one another, forming larger water droplets and ice crystals. When these droplets and crystals become heavy enough, they fall to the ground as precipitation.

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What are metamorphic rocks used for?

Slate starts out as shale under the surface of the Earth before its metamorphosis. It is typically gray in color and splits along long flat planes. It is also does not allow water or other liquids to pass through it. Slate is most often used as a roofing material, decorative gardening stone and a base for snooker tables. In the Victorian era, it was commonly used as a writing board.Marble is another one of the metamorphic rocks and is a metamorphosed limestone. It has a hard crystalline rock appearance and was the stone of choice in ancient Greece. In fact, more than 22,000 tonnes of marble we..

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