Question

A chemical reaction does not involve:
A.Formation of new substances having entirely different properties than that of the reactants
B.Breaking of old chemical bonds and formation of new chemical bonds
C.Rearrangement of the atoms of reactant to form new product
D.Changing of the atoms of an element into those of another element to form new products

Answer 1

Hint: A chemical reaction is a process in which one or more substances, the reactants, are converted to one or more different substances known as products.

Complete answer:
- A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.
- Substances are either chemical elements or compounds.
- Chemical reactions must be distinguished from physical changes. Physical changes include changes of state, such as ice melting to water and water evaporating to vapour.
- Dalton based his theory on the law of conservation of mass and the law of constant composition.
- Dalton states that atoms of the same element are alike in all respects and atoms of different elements are different.
- Under his theory, the fourth part states that a chemical reaction is a rearrangement of atoms and elements does not change from one type to another.

Therefore, the answer to the question is option (D) Changing of the atoms of an element into those of another element to form new products.

Note:
A chemical reaction, one substance is converted into another by rearrangement of atoms and not by changing elements of one type into another.