One point deduction for a significant figure or math error, applied only once per problem. No credit earned for numerical answer without justification. No penalty if curve crosses time axis or levels out above time axis. Curve must drop initially and continually.
Reaction rate is the slope of the line tangent to any point on the curve.
Rate must be tied somehow to slope of the graph Answer may be indicated directly on the graph Instantaneous rate ust be indicated rather than the average rate iii. Use half-life or integrated rate law to solve for k can be accepted. Response must distinguish between rate and rate constant. Either from of the rate law is acceptable, and both the equation and the brief justification are required to earn the point. No point earned if response indicates first order because the first graph is not linear.