Answer: (3) decomposition and melting
Explanation: Chemical change is one in which chemical composition of substance changes.
Physical change is one in which chemical composition of substance do not change.
Freezing is a process in which a liquid changes into solid phase when allowed to cool. Thus it is a physical change.
Melting : It is process in which a solid changes into liquid phase by providing heat. Thus it is a physical change.
Vaporization : It is process in which liquid changes into gaseous phase by providing heat. Thus it is a physical change.
Decomposition is a chemical reaction in which one substance decomposes to form two or more than two products. Thus the chemical composition change, and hence is a chemical change.
Combustion is a reaction in which a substance combines with oxygen gas to produce carbon dioxide, water and a lot of heat. Thus the chemical composition change, and hence is a chemical change.
If the electrolyte contains chemical species that will be reduced at the cathode or oxidized at the anode (or both), that means chemical change. The electrolyte can form one or more compounds or ionic species that weren't there before.
<span> A given species could form at one </span>electrode<span> but diffuse back over to the other electrode where it promptly breaks back up into its reactants. </span>
<span>If the electrolyte does not participate in any reaction(s), it will just act as a conductor of electricity. The same goes for the electrodes. Some materials will react but will not produce anything obvious (gases, precipitates, or color changes). Others will not react at all under the specific combinations of voltage and current. </span>
Answer:
The correct answer is: 3
Explanation:
Carbocation, also known as a cationic carbon, is a chemical species in which the carbon atom forms <u>three covalent bonds</u> and has a formal charge of +1. It is an unstable species.
A carbocation in which the cationic carbon is bonded to three hydrogen atoms, is called a methyl carbocation. Carbocations in which the carbon atom is bonded to one carbon group, two carbon groups and three carbon groups is called primary, secondary and tertiary carbocation respectively.
Answer:
The volume of a given amount of gas is inversely proportional to its pressure when temperature is held constant (Boyle's law).
