The answer is A because An Indicator" changes color when it comes in contact with an acid or a base
An indicator could be anything like:
1) Litmus paper
2) Bromothymol blue
3) Phenolphthalein
Answer:
>400N is needed to balance that lever
The source and the observer are moving towards each other. The observer is moving toward the source. The source is moving away from the observer
Answer:
A title
Explanation:
Because this is middle school.
