Answer:
Questionnaire
Explanation:
This is an instrument for research usually in the form of questions with multiple choice answers with sole purpose of gathering information from respondents for research.
Answer:
3.40g/mL
Explanation:
Density is a measure of mass over volume, so to get the density all we have to do is divide the mass by the volume.
21.35g ÷ 6.28 mL = 3.40g/mL