the answer is D. John Newlands <3
It is very important that the 2.5 M HCl can be added dropwise, slowly and carefully in order to make a good mixture.
<h3>Why HCl can be added dropwise, slowly and carefully?</h3>
Hydrochloric acid can be added in the solution dropwise and slowly in order to mix with the solution very well. This acid should also be mixed with the solution carefully.
This is because hydrochloric acid is a strong acid which can damaged the skin if it is not carefully pour into the solution so we can conclude that HCl can be added dropwise, slowly and carefully is very important in order to make a good mixture.
Learn more about mixture here: brainly.com/question/24647756
Midnight is your answer.
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Answer:
The angle at which the light from the ray box strikes the mirror
Explanation:
The independent variable is the variable that the investigator changes. The question states that Alice "changed the angle at which the light from the ray box struck the mirror."
The light box and the direction of the ray are wrong. They are controlled variables.
The angle of the reflected light is wrong. It is the dependent variable.