From where in the solar system did scientists conduct their spectral analyses in 1948? How do you know?

Both Earth and Space

Explanation:

Because in 1948 there was no ability to analyze from space but in 1966 there was.

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e