Activity A (continued from previous page) 4. Explore: Click Reset and change the indicator to Bromthymol blue. Add exactly 8.8 mL of HNO3 to the flask. A. What does the color of the indicator tell you about the current pH of the flask? B. Add one more drop of HNO3. What does the color tell you about the pH now? ¬¬¬¬¬¬¬ C. If you combine the results of this question with the results from question 3B, what do you know about the total pH change caused by adding the last 0.1 mL of HNO3? 5. Apply: Water has a pH of 7. If 0.1 mL (about one drop) of 1.0 M HNO3 is added to 100 mL of water, the result is a solution with a concentration of 0.001 M HNO3. A. What is the pH of 0.001 M HNO3? B. How much did one drop of HNO3 cause the pH of water to change? C. How does this relate to what you determined in question 4C?

Joseph has hypothesized that sound travels in waves. if he were following the scientific method, what should he do next? a. ask a question. b. test the hypothesis. c. study the results. d. tell other scientists about his hypothesis.

Electromagnets coils of wire paper clips picked up 10 3 15 6 20 9 25 12 ms. owens' class was studying magnets. ms. owens showed her students how to make an electromagnet using a nail, a d-cell battery, and plastic coated wire. the students wrapped the wire around the nail and then attached the ends to the battery. when they were finished, they tested their magnets by investigating how many paperclips their magnets could pick up. they also tested whether they could increase the strength of their electromagnets by using more coils of wire. they recorded the class average of their results in the data table seen here. ms. owens asked her students to graph their data in a line graph. how should the students label the x-axis on their line graph? a) size of battery b) number of paper clips c) number of coils of wire d) strength of electromagnet

Apropane torch is lit inside a hot air balloon during preflight preparations to inflate the balloon. which condition of the gas remains constant