Part B: Using scientific notation in calculations and interconverting between scientific notation and standard notation Scientific notation is used to make very large and very small numbers more convenient to work with. When working with dilute acid and base solutions, the concentrations of the H3O* ion and OH are related by this equation at 25 C: [H301[OH] = 1.0 X 1014 Note: entering scientific notation in to your calculator is different for different calculators. Take time right now to google how this is accomplished on your calculator and write down notes: you'll need this on your first test! 8. Given that the value of [H3O+] 3.4 X 10-5 M, calculate the value of [OH] 0.000034 MLOHenececsseel Loh"): 2.9x10-10M 9. Given that the value of [OH] = 8.7 X 10-10 M, calculate the value of [H301 5 -H CHEM 101 Exp. #7, p.3

If a water sample has 0.07 mol of calcium ions in 15 L solution, what is the water hardness level in mg/L? Pay attention to the unit. Hint: For the calcium mass , convert mol to g to mg. (1 mol calcium ion= 40.08 g/mol and 1 g = 1000 mg) Round and report your answer to an integer without decimal place. Report numeric value only, no unit. • Water hardness levels according to EPA Soft: 0-60 milligrams per liter (mg/L) as calcium carbonate Moderately hard: 61-120 mg/L as calcium carbonate • Hard: 121-180 mg/L as calcium carbonate Very hard: more than 180 mg/L as calcium carbonate

For the Shaefer-Fulton endospore stain method, the working solution of safranin is made by combining 10 mL of stock solution with 90 mL of distilled water. If you need to produce 1,046 mL of working solution, how many grams of safranin O will be required to make the smallest batch of stock solution possible? • Report your answer in grams using standard decimal notation rounded to two decimal places. • Include trailing zeros. • Do not include the units in your answer 。 If your answer is 100.105 g it would be reported as 100.11 。 If your answers was 100.203 g it would be reported as 100.20

In the table below you will find three descriptions of scientists engaging in activities that are part of the scientific method. What are the missing words? Continue description Hans decides to test an idea that the atom is made of a soft positive substance with hard specks of negative substance (the electrons) embedded in it. He sets up an in which heavy positive particles will be fired into some gold atoms. Hans will monitor how much these positive particles are deflected passing through the gold atoms. J. J. suggests the that an atom subjected to a high voltage becomes charged because it's made of some positive material with small bits of negative material embedded in it, like raisins in a pudding. The high voltage rips the negative bits out, leaving the positive material behind, and making the once neutral atom charged. After studying how many different elements absorb X-rays, Harry finds that the atomic number of the element is always proportional to the square root of the…

An electric current of 22.90 A flows for 20.0 minutes. Calculate the amount of electric charge transported. Be sure your answer has the correct unit symbol and the correct number of significant digits.

please please well explained answer 4 or more sentences in length make them Clear and accurate ideas with supporting details Answers all questions in prompt and  Written in a complete sentences use  Masterfully utilizes scientific vocabulary at last but not least Includes diagram with labels.   the question is  Qualitative analysis is the identification of an unknown based on a comparison of physical and/or chemical properties of known substances. If your medicine bottle and another unknown identity bottle of medicine were found in the same drawer, how would you use the physical and chemical properties of the substances to distinguish it from the other? think about how it reacts with other solutions in a reaction. make sure there is flow chart to describe it

Please don't provide handwritten solution .....

1) State your interpretation of the meaning of the slope for the first graph you prepared of Volume of Steel Nuts (mL) versus Number of Steel Nuts. Hint: Understanding the meaning of a slope involves several factors: the units which are a ratio of the y axis units over the x axis units, the interpretation of the slope as “number of the y axis units for every one of the x axis units” and the concept that constructing the best line or curve that follows the trend in the data is a sort of averaging of the random error throughout the data.