An ideal gas (which is is a hypothetical gas that conforms to the laws governing gas behavior) confined to a container with a massless piston at the top. (Figure 2) A massless wire is attached to the piston. When an external pressure of 2.00 atm is applied to the wire, the gas compresses from 6.60 to 3.30 L. When the external pressure is increased to 2.50 atm, the gas further compresses from 3.30 to 2.64 L. In a separate experiment with the same initial conditions, a pressure of 2.50 atm was applied to the ideal gas, decreasing its volume from 6.60 to 2.64 L in one step. If the final temperature was the same for both processes, what is the difference between q for the two-step process and q for the one-step process in joules? Express your answer with the appropriate units.

1) Calculate the areas of the rectangle and circle in cm2. Report the answers to the correct number of significant figures. a. Area of rectangle b. Area of circle

4. The SI prefix for one million (10°) is A. mega B. metro C. micro D. milli E. millio

1. Why are units so important in measurement? Giving examples of measurements with no units should help. 2.  What does it mean to say that 2 expressions are equivalent?

Question 2

How do you determine the number of significant figures to keep in an answer obtained by multiplying or dividing? A. Report the answer with the same number of decimal places as the measured number with the fewest decimal places B. Report the answer with the same number of significant figures as the measures number with the highest significant figures C. Report the answer with the same number of significant figures as the measured number with the fewest significant figures D. Use the calculator value

Student A measures an object and records a value of 1.5 cm. Student B measures the same object and records a value of 1.50 cm. They have both done their measurements correctly. Why do these measurements differ?

MRe Part A pH 9.0 Express your answer using one significant figure. 阳 AE中 (H3O*] = Submit Request Answer Part B pH 9.0 Express your answer using one significant figure. ? %3D = (-HO] Submit Request Answer Part C pH 2.0 Express your answer using one significant figure. P Pearson

Why are significant figures rules for calculations more important in science than in math class?

The ionic radius of a sodium ion is 2.27 angstroms (Å) . What is this length in um х STARTING AMOUNT *( ) 104 1010 10-8 10-4 108 106 0.0227 10-6 2.27 2.27 x 10-8 2.27 x 10-4 2.27 x 10-10 10 10 um cm m