Depends on the chemicals, you get a different reaction from different ones.
The mass of the two chemicals are just combined, and are never changed. They may change forms, like from a solid to a gas, but the mass is always the same.
These chemicals are called reactants.
When ammonia and bleach are combined, they create a toxic gas called chloramine, which can cause respiratory issues and other health problems. It is important to never mix these two chemicals together.
When a chemical base is combined with an acid, a neutralization reaction occurs. The base accepts hydrogen ions (H+) donated by the acid, which results in the formation of water and a salt. The pH of the solution changes towards neutrality.
A combination of chemicals is known as a reaction. When two chemicals, which are referred to as reactants, are combined, they for a chemical compound.
Yes
Chemicals yes, elements however, no. Elements are themselves chemicals, Burn hydrogen in oxygen and you'll end up with water, another chemical.
you die
A mixture contains 2 or more chemicals that are not chemically combined, meaning they can be physically separated. Examples include saltwater and air.
water, hydrogen peroxide
A mixture.
Hydrogen peroxide and a phenyl oxalate ester are combined inside a glow stick. When these two chemicals mix, they undergo a chemical reaction that produces light.