I would say that the density increases because the distance between the molecules decreases, and therefore becomes smaller, and vice versa the density increases, and that is a physical change not a chemical change.
Answer: c. oxidation - gain of electrons
Explanation:
1. Synthesis reaction is a chemical reaction in which two reactants are combining to form one product.
Example:
2. Decomposition is a type of chemical reaction in which one reactant gives two or more than two products.
Example:
3. Oxidation reaction is defined as the reaction in which a substance looses its electrons. The oxidation state of the substance increases.
4. Dehydration reaction is defined as the reaction in which water is lost as product.
5. Hydrolysis reaction is defined as the reaction in which water is used for decomposition.
Example:
The basic unit of mass in the metric system is grams
A double bond in chemistry is a chemical bond between two chemical elements involving four bonding electrons<span> instead of the usual two. The most common double bond, that is between two </span>carbon atoms<span>, can be found in </span>alkenes<span>. Many types of double bonds exist between two different elements.</span>