Choose a topic that you are interested in, and come up with a testable question. Write a procedure so that you could perform an experiment if you wanted to, or someone else could read it and follow the steps. Include all the steps of the scientific method. Since you will not be able to record data or draw a conclusion, for the last two steps please include a description of what each step involves. Your finished product should include the following:

Explanation:

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

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.