ACT Prep Round 7 Subject: Science CPW Week 34 -

Learning Intentions -

Today, we will address these College Readiness Standards in Science: Interpretation of Data, 20-23 Scientific Investigation, 20-23 Interpretation of Data, 24-27 Evaluation of Models, Inferences, and Experimental Results, 16-19 Success Criteria – I know I am successful when I can translate information into a graph, identify a control in an experiment, compare data from a complex data presentation, and identify implications in an experiment.

Please Note

• • • You have 3 Minutes to read your passage.

You will have 1 minute and 15 seconds to work on each question individually.

You will have 1 minute and 30 seconds to work as a group and write your rationales for each answer.

Science

#1. In order to display the relationship between concentration and the rate of the reaction more effectively in Experiment 1, the chemist could: A. construct a bar graph of the concentration of formaldehyde in each trial.

B. plot the HCHO concentration against the time required for the color change.

C. plot the change in Na 2 SO 3 and NaHSO 3 concentrations in each trial against the HCHO concentrations.

D. produce a table cataloging the differences between the times for the color changes in successive trials.

Science

#2. If Reaction 1 was found to be exothermic (heat producing), how could Experiment 1 be modified to examine only the effect of concentration on reaction rate?

A. The concentration of formaldehyde could be increased.

B. A different method could be used to determine the color change.

C. The temperature of the solution could be set to a constant temperature.

D. The temperature of the solution could be increased.

Science

#3. The fastest rate of reaction in Experiment 1 occurred when the: A. time for the color change to occur was greatest.

B. concentration of NaOH was greatest in the reaction mixture.

C. concentration of HCHO was smallest in the reaction mixture.

D. concentration of HCHO was greatest in the reaction mixture.

Science

#4. The function of phenolphthalein in both experiments was to: A. signal when the NaHSO 3 was gone.

B. signal when the NaOH was gone.

C. cause the HCHO solution to react.

D. slow down the rate of reaction.

Science CPW

• • •

Repeat the questions with your squad members. Be sure to write a rationale. If you don’t write a rationale, you won’t learn as much. Your brain is like a muscle. Use it!

1 minute and 30 seconds per question for Squad Mode.

After the rationale writing is done, launch the Answers video.