Answer:
Invention
Explanation:
Scientific ideas can be applied in novel was to solve new scientific problems and create new technology. This process helps to make life easier and better.
The application of scientific knowledge to solve new problems and create new technology is generally referred to as invention.
Chemical change can be determined when a substance change it's state of composition and is irreversible. Five evidences that chemical change has occured are, color change, formation of a precipitate, formation of gas, odor change, temperature change. Examples of chemical change are, combustion reactions, rusting iron, precipitate of AgCl.
The mass number of an isotope is determined by the number of neutrons in the isotope plus the number of protons.
For instance Carbon-13 is an isotope of carbon. The "13" is the mass number of the isotope.
So, in this example, 13 = #protons + #neutrons