Answer:
1. 
: Synthesis
: Decomposition
: Combustion
4. 
: Double displacement
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. Combustion is a type of chemical reaction in which hydrocarbon is reacted with oxygen to form carbon dioxide and water.
Example:
4. Double displacement reaction is one in which exchange of ions take place.
Example: 
Answer: you'll see cyan color on the screen
Explanation:
Saturating the red cone causes them to stop functioning, hence you can't perceive the red part of white light. White light is made up of three main colors which are blue, red and green. When one can no longer perceive the red part of light, one is left with the grean and blue part. The green and blue part of light will superimpose to give a cyan color.
Answer:
Positive
Explanation:
In an endothermic reaction, the products are at a higher energy than the reactants. This means that the enthalpy change of the reaction (∆H) is positive
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