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Oct 4, 2024 · 3,338 solutions. Terms in this set (28) color change. white spots caused by bleach. energy change. thermal energy produced by a fire. solid formation. precipitate. gas formation. bubbles. How do the properties of new substances compare with the properties of the original substances after a chemical change takes place?
1 day ago · The substance (or substances) initially involved in a chemical reaction are called reactants or reagents. Chemical reactions are usually characterized by a chemical change, and they yield one or more products, which usually have properties different from the reactants.
Oct 7, 2024 · Fire, rapid burning of combustible material with the evolution of heat and usually accompanied by flame. It is one of the human race’s essential tools, control of which helped start it on the path toward civilization. The original source of fire undoubtedly was lightning, and such fortuitously.
- The Editors of Encyclopaedia Britannica
- Fire is a rapid burning of combustible material in the presence of oxygen manifested as flames. It is usually accompanied by heat and light. Fire i...
- Evidence suggests that the earliest controlled use of fire by hominins was about 1,420,000 years ago. However, it was not until about 7000 BCE that...
- Early humans used fire to keep warm and cook their food. They also learned to use it in hunting and warfare, to kill insects, and to clear forests...
- The most widespread method of producing fire among prehistoric peoples was the friction method. Most commonly, a pointed hardwood was twirled betwe...
- Fire has been an essential element at every stage of the growth of civilization. Much of the history of technology and science might be characteriz...
2 days ago · The substance dissolved in a solution is called the ____________ . Solute. What kind of mixture are particles < 1 nanometer away from each other? Homogeneous. What kind of mixture are particles > 1000 nanometers away from each other? Heterogeneous.
5 days ago · In a reaction, the ions of two compounds exchange places in aqueous solution to form two new compounds. This reaction is called a(n) ___ a. Synthesis reaction b. Decomposition reaction c. Single-replacement reaction d. Double-replacement reaction
Oct 3, 2024 · combustion, a chemical reaction between substances, usually including oxygen and usually accompanied by the generation of heat and light in the form of flame.
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Oct 3, 2024 · The chemical reaction in such flames occurs within a narrow zone several micrometres thick. This combustion zone is usually called the flame front. Dilution of the burning mixture with an inert gas, such as helium or nitrogen, lowers the temperature and, consequently, the reaction rate.
