Answer:
The change during the burning of a match stick is a irreversible chemical change while the change when a liquid starts boiling is reversible chemical change.
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Explanation:
The best design for this experiment is to number the items from 1 to 1,200 and then choose random numbers in the table of random digits (second option).
<h3>How to use a table of random digits?</h3>
These tables are used to randomly assign items or subjects into groups when experimenting. The best way to use these tables are:
- Give each item or participant a number.
- Take a lot at the table and choose a number.
- If this number is the same that the number assigned to an item or participant classify it in the first group.
- Keep selecting.
Based on this, for this experiment the steps are:
- Number the items from 1 to 1,200.
- Identify numvers in the table.
- Assign the first 400 items to the process 1 group.
- Repeat the process for the other two groups.
Learn more about experiments in: brainly.com/question/11256472
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A molecule is a matter that moves around fast
Density is defined as mass/volume (or m/v).
So,
(126.0 g)/(12.5 cm^3)= 10.08 g/cm^3
If your teacher requires correct significant figures, the answer is 10.1 g/cm^3.
If not, the first answer is fine.