Answer:
Compounds can be broken down into simpler substances by chemical means, but elements cannot. break a compound into simpler substances; oxygen and hydrogen that water contains.
But where is the following?
The answer is 15 bc you multiply the coefficient but the subscript
Because of the surface tention.
Answer:
Explanation:
This question appears incomplete but can however still b answered.
The purpose of the experiment is <u>to test the effectiveness of the new sunscreen</u>.
An independent variable is the variable that is changed (directly or indirectly) during the course of an experiment. The independent variable here are the <u>sunscreen</u>.
A dependent variable is the variable that is been tested in the course of the experiment. The dependent variable here is the <u>redness of the skin</u>.
The first group here (this could be in the missing part of the question, hence response not certain) is the control group. The control group consists of the arms sprayed with the leading/old sunscreen formula.
The second group is the test group. It consists of the arms sprayed with the new sunscreen formula.
The factors that are kept constant (or control variable) are <u>the duration under the sun (4 hrs)</u> and <u>the participants' arms used</u>.
The <u>test group is the second group</u> while <u>the group used for comparison</u> (to be sure the new sunscreen is more effective) <u>is the first group</u>.