what are chemical reactions ks3?
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Chemical reactions. Atoms are rearranged in a chemical reaction. ... react together are called the reactants. are formed in the reaction are called the products.
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The types of chemical reaction are: Combination reaction. Decomposition reaction. Displacement reaction.
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The two basic reaction types are synthesis and decomposition. Synthesis reactions are reactions that assemble substances together into larger molecules and/or compounds. Decomposition reactions are the opposite of synthesis reactions because they take apart larger molecules and/or compounds.
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Chemical reaction. A process during which chemical bonds between atoms are broken and new ones are formed. Producing one or more different substances. reactant. the starting materials in a chemical reaction.
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Exothermic and endothermic reactions When a chemical reaction occurs, energy is transferred to or from the surroundings. There is usually a temperature change. For example, when a bonfire burns it transfers heat energy to the surroundings.
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Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.
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chemical reactions:combustion. Combustion reactions always involve molecular oxygen O2. Anytime anything burns (in the usual sense), it is a combustion reaction. Combustion reactions are almost always exothermic (i.e., they give off heat).
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Chemical reactions involve breaking bonds in reactants and forming new bonds in products. Breaking bonds requires energy, and forming bonds releases energy. The energy associated with bonds is called What happens to this energy during a chemical reaction?
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['Coal: Combustion reaction converts chemical energy into light and heat.', 'Wood: Combustion reaction converts chemical energy into light and heat.', 'Petroleum: Can be burned to release light and heat or changed into another form of chemical energy, such as gasoline.']
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A synthesis reaction is a type of reaction in which multiple reactants combine to form a single product. Synthesis reactions release energy in the form of heat and light, so they are exothermic. An example of a synthesis reaction is the formation of water from hydrogen and oxygen.
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A chemical reaction is usually accompanied by easily observed physical effects, such as the emission of heat and light, the formation of a precipitate, the evolution of gas, or a color change. Absolute confirmation of a chemical change can only be validated by chemical analysis of the products!
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['Toxicity.', 'Reactivity.', 'Types of chemical bonds formed.', 'Coordination number.', 'Oxidation states.', 'Flammability.', 'Heat of combustion.', 'Enthalpy of formation.']
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A chemical reaction is when the substance is chemically change. a chemical reaction also can't be reversed. When paper is burn, the cellulose in the air reacts with the oxygen to form carbon dioxide and water.
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Chemical reactions are common in daily life, but you may not recognize them. Look for signs of a reaction. Chemical reactions often involve color changes, temperature changes, gas production, or precipitant formation. Simple examples of everyday reactions include digestion, combustion, and cooking.
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The number of reacting species (atoms, molecules or ions) which collide simultaneously to bring about a chemical reaction is known as molecularity of a reaction. The number of molecules (or atoms) whose concentration (or pressure) determines the rate of reaction is called the order of the reaction.
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['Tearing paper.', 'Boiling water.', 'Melting ice.', 'Sublimation of ammonium chloride.', 'Changing shape of clay.', 'Freezing water.', 'Folding paper.', 'Making dough.']
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In a chemical reaction, atoms are combined, separated, and rearranged to form new compounds, and the atoms that compose these elements exist in whole number ratios.