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US Army trucks laden with ammunition, displaying a Class 1.1D Explosives placard on the front.. Hazmat Class 1 are explosive materials which are any substance or article, including a device, which is designed to function by explosion or which, by chemical reaction within itself is able to function in a similar manner even if not designed to function by explosion.
The eleven-plus (11+) is a standardised examination administered to some students in England and Northern Ireland in their last year of primary education, which governs admission to grammar schools and other secondary schools which use academic selection. The name derives from the age group for secondary entry: 11–12 years.
Chemistry sets may have been the first American toys marketed toward parents with the goal of "improving" children for success in later life. [10] Gilbert Lab Technician Set for Girls, 1958, at the Science History Institute Johnny Horizon Environmental Test Kit, 1971, at the Science History Institute. The target market for chemistry sets was ...
Chemistry is the scientific study of the properties and behavior of matter. [1] It is a physical science within the natural sciences that studies the chemical elements that make up matter and compounds made of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during reactions with other substances.
If an atom, A, is double-bonded to another atom, then atom A should be treated as though it is "connected to the same atom twice". [11] An atom that is double-bonded has a higher priority than an atom that is single bonded. [11] When dealing with double bonded priority groups, one is allowed to visit the same atom twice as one creates an arc. [12]
Chemistry, from the Greek word χημεία (khēmeia) meaning "cast together" or "pour together", is the science of matter at the atomic to molecular scale, dealing primarily with collections of atoms, such as molecules, crystals, and metals.
Gemini 11 (officially Gemini XI) [2] was the ninth crewed spaceflight mission of NASA's Project Gemini, which flew from September 12 to 15, 1966.It was the 17th crewed American flight and the 25th spaceflight to that time (includes X-15 flights over 100 kilometers (62 mi; 54 nmi)).
The Krugerrand is the first modern example of measuring in "pure gold": it should contain at least 12 ⁄ 11 ounces of at least 11 ⁄ 12 pure gold. Other bullion coins (for example the British Sovereign ) show neither the purity nor the fine-gold weight on the coin but are recognized and consistent in their composition.
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