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What element produces a green flame when burned?

To mix the two chemicals, about 1 teaspoon of boric acid (boron in chemical form) is needed, followed by a couple drops of methanol. Green flames can also be created by burning copper, tellurium, thallium, manganese and molybdenum.\nMethanol is incredibly dangerous; if the fumes are inhaled, absorbed through the skin or ingested, they can cause death or blindness.

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How much does one cubic meter of concrete weigh?

Concrete can be used for a variety of construction purposes, such as building the foundation of a building. It can also be used for paving projects. There are two different types of concrete that are used for these applications, and they each weigh a bit different.Foundation concrete weighs more and is a bit denser than concrete used for general purposes. To create one cubic meter of concrete, it takes six 50 kg bags of cement. To create one cubic meter of general purpose concrete, it takes seven 50 kg bags of cement.

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Why are lasers red?

Apart from not scattering easily, the other reason why the color red is widely used in lasers is because it comes from helium and neon, which are the cheapest and most-reliable sources available. According to Michael Dubson, a senior instructor in physics at the University of Colorado, Boulder, "It is possible to make a laser in any color, but it would be expensive and pointless," and, therefore, red lasers are the most common.

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What does the nucleus of an atom contain?

The three primary subatomic particles that constitute matter include neutrons, protons and electrons. Protons carry positive charges, electrons carry negative charges and neutrons are electrically neutral. The net positive charge of the nucleus is the result of the positively-charged protons within the central core. Protons and neutrons are almost identical in mass while electrons are so light that their masses are sometimes considered negligible.A chemical element is composed of the same type of atoms. An atom of a particular element retains all the chemical properties of that element. In a p..

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Is algae a plant?

As much as 75 percent of Earth's oxygen is produced by algae and cyanobacteria. It is the basis of the aquatic food chain, since all life in the water either feeds on algae or on something that eats algae. A few types of algae feed off other living things instead of using sunlight for photosynthesis. These other algae produce toxic substances that cause sores on fish, and the algae then eats the blood and fluids that seep from the sores.

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Name three kinds of mass movement?

The name of a mass movement is determined by how much water is present and how quickly the mass moves. Falls are movements that involve rocks falling from the air and landing at the bottom. Slides involve rock or soil moving suddenly and quickly down a slope. Flows are mixtures of water, rock and sediment. They can be large, blocking roads and burying entire cities.

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How does Soxhlet extraction work?

The Soxhlet extractor was invented in 1879 by Franz von Soxhlet to extract lipids from solid materials. The extractor only works when the solute being extracted has limited solubility in the solvent in which it is dissolved. This means that the Soxhlet extractor cannot be used to extract ionic salts from polar solvents such as water, because the solubility limit of such salts in water is extremely high.\nThe material containing the compound to be extracted is loaded in a thimble and placed inside the percolator. An extraction solvent is added to the material if the material is not already diss..

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What is a barometer used for?

Air pressure is a reliable weather predictor. Lower air pressure is usually an indication of rain. Likewise, the higher the air pressure, the more likely the chance of sun. Since lower elevations tend to have higher atmospheric pressures while higher elevations have lower ones, barometers must be calibrated specifically for the elevations in which they're located. Although mercury was originally used as the weather indicator in barometers, it has been almost completely replaced by aneroid barometers due to the highly toxic properties of mercury.

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Where does respiration occur in plants?

Respiration combines oxygen within a plant with stored sugars converted from photosynthesis. Photosynthesis is dependent on sunlight, while respiration does not require sunlight for activation and is constantly performed throughout the plant. Respiration is dependent on oxygen, and may be inhibited by over-watering or in soil incapable of proper drainage, which may deprive a plant's root system of necessary oxygen. A lack of oxygen may deprive a plant of nutrients and result in damage or its death.

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How do you learn AP physics?

A key goal of AP physics courses is to prepare students to perform well on the College Board exam, as many colleges and universities award credits to those who achieve a high score on the test. Since the AP exam emphasizes multiple-choice and extended-answer questions, courses that prepare students for the test typically incorporate numerous practice problems into the syllabus. Furthermore, strong preparation for the exam requires students to develop and refine core science skills, such as identifying cause-and-effect relationships and analyzing numerical data.\nStudents who want to maximize t..

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