Using the laws of constant composition and the conservation of mass,complete the molecular picture of hydrogen molecules (circles) reacting with chlorine molecules (squares) to give hydrogen chloride (HCl) . 
Definitions:
Focus Group
A research method involving a small, diverse group of people whose reactions are studied especially in response to new products or policies.
One-on-one Interviews
A qualitative research method involving a structured or semi-structured conversation between a researcher and a participant to gather in-depth information.
Scientific Method
A method of procedure consisting of systematic observation, measurement, experiment, and the formulation, testing, and modification of hypotheses.
Systematic Way
A method based on a deliberate plan of action or procedure that follows a logical sequence or structure.
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