SCIENCE
PHYSICAL SCIENCES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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can neither be created nor destroyed.
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the appearance or form of the matter changes but the kind of matter in the substance does not.
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the ratio of actual yield to predicted yield times 100
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reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.
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Detailed explanation-1: -In a chemical change, the atoms in the reactants rearrange themselves and bond together differently to form one or more new products with different characteristics than the reactants. When a new substance is formed, the change is called a chemical change.
Detailed explanation-2: -According to the modern view of chemical reactions, bonds between atoms in the reactants must be broken, and the atoms or pieces of molecules are reassembled into products by forming new bonds. Energy is absorbed to break bonds, and energy is evolved as bonds are made.
Detailed explanation-3: -Chemical reactions involve breaking chemical bonds between reactant molecules (particles) and forming new bonds between atoms in product particles (molecules). The number of atoms before and after the chemical change is the same but the number of molecules will change.
Detailed explanation-4: -In endothermic reactions, more energy is absorbed when the bonds in the reactants are broken than is released when new bonds are formed in the products. Endothermic reactions are accompanied by a decrease in temperature of the reaction mixture.
Detailed explanation-5: -reactants The bonds between atoms are broken and rearranged as new bonds to make the new product. In a chemical reactions, reactants react to form products ( new substances) The bonds in the molecules of reactants break by absorption of energy and rearranges to form new bonds .