Nwhich two types of reactions do opposite chemical changes occur? double replacement and combustion single replacement and double replacement synthesis and decomposition combustion and synthesis

synthesis and decomposition

Explanation:

1. Double displacement reaction is one in which exchange of ions take place.

Example:

2. Combustion is a type of chemical reaction in which fuel is reacted with oxygen to form carbon dioxide and water.

Example:  

3. Single replacement reaction is a chemical reaction in which more reactive element displaces the less reactive element from its salt solution.

Example:

4. Synthesis reaction is a chemical reaction in which two reactants are combining to form one product.

Example:

5. Decomposition is a type of chemical reaction in which one reactant gives two or more than two products.

Example:

Thus synthesis ad decomposition are opposite chemical changes.

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be

true tan speed = ang vel x radius