AP1 (2)

2:53 1 Question 43 of 45 Submit A student needs to run 3.2 km to get to school. If the student can run 5.5 mi/hr , how many hours will it take them to get to school? STARTING AMOUNT ADD FACTOR ANSWER RESET -( ) %3D 18 1 mi/hr 0.36 km 1.609 mi 5.5 hr 60 min 0.94 3.2 0.58 0.6214 35 Tap here or pull up for additional resources

I just need parts C and D. Thanks!

Unit conversions

* Question Completion Status: QUESTION 3 A If 20.0 Cal make an ounce, how many ounces of formula should a baby drink per day if the energy need per day is 1.50 x 10³ Cal? Express answer to the correct number of significant figures. 75.0 x 10E3 ebapps~2Fblackboard~2Fcontent~2Flist Content.jsp%3Fcourse_id%3D_514... QUESTION 4 A 9.86 g sample of iron metal was heated in water to 85°C. Then, it was dropped into a beaker containing 240.0 g of H₂O at 28.5°C. Assuming that the water gained all the heat lost by the iron, what is the final temperature of the H₂O and Fe? If 756 cal of heat were added to 64.8 g of Al at 32.5 °C, what is the final temperature of the aluminum? 10

100- 8 8 Relative Intensity $ 20- 0- Relative Intensity 10 200- 80- 40- 20- 0- 10 20 30 m/z 20 20 100 $10 Chlorine OR Bromine OR Neither Chlorine OR Bromine OR Neither 90 100 100- Relative Intensity DO- ģ 20- 0 100 80 10 8 Relative Intensity 3 0- 10 40 30 60 15 m/z Chlorine OR Bromine OR Neither 35 40 45 m/z weytekakumpumakija 30 100 110 55 Chlorine OR Bromine OR Neither

I need help with my Chemistry problems. Can you help me, please?

3 trials including the time it took and calculations

I’m not sure if my answer is correct, can someone show me how to do the problem?

I am not sure what is being asked for in question #2.

1 cmol Ca2+ = 1 cmol Na+   true or false

49) Calculate the length of a copper wire having a diameter of 0.200 cm and a mass of 15.620 g. The density of copper is 8.92 g/cm3. (Given: volume = 7 d2 L/4, where p = 3.14, d = diameter, and L = length) A) 1.80 x 10-4 cm B) 4.00 x 10-4 cm C) 1.75 cm %3D %3D %3D D) 5.50 × 10-2 cm E) 55.8 cm

Compare the objects and masses from Part III. Which measurement included the highest percent of uncertainty? Explain why this measurement had more uncertainty than the others.

ngures. Useful Information: 2.540 cm 1.000 in 29.6 mL 1.00 oz 3.28 ft= 1,00 m 1) What is the density in g/mL of gasoline if 0.066 kg occupies 100 mL? 2) What is the mass of heptane that will occupy 250 mL of its density is 0.684 g/mL?

Which conversion factor has an incorrect relationship? 103kg= 1g 1cm= 10-2m 1microliter= 10-6L 1dL= 10-1L

What is the answer?

After creating her standard curve for absorption versus the concentration (M) of FD&C Red 40 and processing her data, Sally found that her drinking strength Kool-Aid sample had a concentration of 4.692 x 10–5 M. If 0.132 grams of Kool-Aid powder was used to prepare an 8-fl oz cup of her assigned flavor, what is the percent by mass of FD&C Red 40 in her Kool-aid powder? Report your answer as a percentage with two places after the decimal. Do not include the percentage sign in your answer. Pay attention to units. You are trying to find the mass percentage of red dye, so you need to know each variable in the equation in Appendix B. Note that the percent by mass equation should be multiplied by 100. There may be some useful conversion factors in the experimental procedure.

Compare the objects and masses from Part III. Which measurement included the highest percent of uncertainty? Explain why this measurement had more uncertainty than the others.

A class of chemistry students measured the density of an unknown liquid. If the correct density of the sample is 1.14 g/mL, what is the percent error for their average experimental density? Group Density (g/mL) 1 1.033 1.185 1.075 4 1.026 1.135 1.022 %E = 94.6% %3D %E = 5.4% %3D %E = 6.1% %E = 5.7%

What do the abbreviations in the equations below mean?  (write next to the equations)   C  +  MU  =  R   C%  +  MU%  =  100%   MU%  =    MU   × 100%                      R     C%  =   C   × 100%    R

1. Give the precision of each of the followings: 50 mL buret 100 mL graduated cylinder 10 mL Mohr pipet 25 mL graduated cylinder 0-100oC thermometer   2. Calculate the percent error for the last trial for each piece of equipment (50.0mL).     3. A student reported the mass of ten glass beads as 2.507 ± 0.015 g. What should the student report as the mass of one bead? Explain your answer.   4. A student reported the density of ten glass beads as 2.05 ± 0.34 g/mL. What should the student report as the density of one glass beads? Explain your answer.   5. A student noticed that the average diameter of the glass beads used for the mass measurements was significantly smaller than those used for the volume measurements. How would experimental determination of the density of glass be affected? Is this a systematic or random error?