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Are iodine crystals a homogeneous mixture?

Matter can be classified into two categories: mixtures and pure substances. Mixtures are described as either homogeneous or heterogeneous. Homogeneous mixtures have a uniform composition, and heterogeneous mixtures do not. Pure substances can either be elements or compounds. Elements can exist as isolated atoms or in molecule chains, and compounds exist as molecules of at least two different elements.

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What makes a rubber ball bounce?

Rubber is a strong material that withstands deformation. Rubber can be stretched, squeezed and dropped from dizzying heights without taking on physical damage. The material’s strength and elasticity are the key characteristics that cause rubber balls to bounce.\nRubber’s elastic material is the primary reason why rubber balls bounce. Elasticity is the tendency for objects to retain their original shape. When dropping a rubber ball, the part of the ball that hits the ground flattens out. Rubber’s elastic nature causes the ball to reactively return to its round shape, which pushes the ball..

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What weighs one ton?

One ton is equal to 2,000 pounds. Also known as the short ton, the ton is the standard unit of measure used in the United States. There are many different animate and inanimate objects that weigh 1 ton, a fraction of 1 ton or a multiple of 1 ton.\nThe giraffe, the tallest animals on Earth, can weigh more than 1 ton. The giraffe can run as fast as 35 miles an hour and has spots that help camouflage it amongst the trees on the African savanna.\nThe MK-84 bomb is a 2,000-pound, unguided bomb that can be dropped from military aircraft to destroy a target on the ground. When the Joint Direct Attack..

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What are microwave measurements and how are they used?

Microwave frequencies are measured using frequency counters (electronic technique) or physical resonators (mechanical technique).\nFrequency counters use a tuneable oscillating circuit to generate a frequency, usually by sending an electric signal through a quartz crystal. The frequency generated by the crystal acts as a reference, which is then tuned to match the microwave frequency being measured. This technique is also referred to as beat frequency detection.\nPhysical resonators, such as absorption wave meters, use a coil of wire attached to a circuit to measure frequency. Instead of tunin..

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How do humans inhale and exhale?

The entire breathing process relies on the diaphragm to control the lungs and related muscles. Inhaling begins with a contraction of the diaphragm, which causes the chest cavity to enlarge. This, in turn, leads to the lungs expanding to fill the newly enlarged chest. As the lungs expand, they reactively pull in air through the nose and mouth because they are directly linked via the windpipe. Once the lungs and chest cavity reach their maximum size, the inhaled air is absorbed into the lungs thorough the bronchial tubes. Oxygen is removed from the inhaled air, and is replaced with carbon dioxid..

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What happens when lightning strikes sand?

To form fulgurite from a lighting strike, the temperature must rise above 1,800 degrees Celsius, or 3,270 degrees Fahrenheit, and then cool, all within the span of about one second. Photos of fulgurite standing on the beach typically show it mostly exposed above the beach; however the initial formation occurs beneath the surface of the sand. Over time, erosion occurs, and the material surrounding a fulgurite is removed, making it visible.\nGlass is fairly resistant to water erosion, so small formations of fulgurite can last for quite some time before being discovered, but it is fragile, so lar..

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What types of plants live in the deep sea?

From the surface of the oceans and seas down to around 1,000 meters, plant life is varied and abundant. Sea grass and kelp anchor to the ocean floor or rocks, growing upwards towards the light. These plants are marked by broad, green leaves that are typically thick and fibrous. Algae grows both on rocks and other plants and flows freely in the water column. Phytoplankton grows in the water column, typically smaller than is visible to the human eye, and provides nutrients to many other sea creatures.\nBelow 1,000 meters, no sunlight penetrates the water. Below 200 meters, the amount of light va..

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What do you need to do before you can make a hypothesis?

The scientific method can be broken down into six distinct steps. First, a scientist forms a question regarding certain phenomena, then he researches what has already been discovered on the subject. For example, he might wonder if carbon dioxide is lighter or heavier than the mix of gas molecules found in air. Before he comes up with a hypothesis, he has to research what other scientists had already discovered about carbon dioxide. The third step in the scientific method is the formation of a hypothesis – the scientist makes a statement about the behavior of carbon dioxide based on what he h..

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Why are giant pandas becoming extinct?

All wild giant pandas live in the Yangtze River basin in China. Rapid industrialization in China has destroyed much of the forest in this area. Each giant panda eats about 28 pounds of bamboo a day, and a dwindling supply of bamboo due to fewer bamboo forests leads to malnourishment and fewer pandas.\nPandas are solitary animals each living in their own territory. Individual pandas only meet up briefly during the spring for mating. Growing numbers of roads and miles of railway track increasingly prevent pandas from finding suitable mates during the brief period when females are fertile.\nChine..

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Who is most sensitive to the effects of carbon monoxide?

Carbon monoxide, or CO, is a colorless, odorless gas that emitted during incomplete combustion of fuels. Exposure to CO, even at minimum concentrations, may result in poisoning, which may prove fatal at higher levels.Common symptoms of CO poisoning include disorientation, headaches, tinnitus, queasiness, exhaustion and difficulty breathing. These symptoms most easily manifest in the elderly and the young, whose vital organs are either damaged or underdeveloped. People undergoing extreme physical stress are also extra sensitive to the harmful effects of CO.

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