QUESTION 31 Imagine you are preparing an enzyme assay that requires a working concentration of 4 mM sucrose. If the concentration of sucrose in your stock solution is 100 mM and the final volume of the assay is 50 μL, how much of the sucrose stock solution do you need to add to the assay? Enter the number only for units of μL. The number of significant digits you include in your answer doesn't matter.

QUESTION 31 Imagine you are preparing an enzyme assay that requires a working concentration of 4 mM sucrose. If the concentration of sucrose in your stock solution is 100 mM and the final volume of the assay is 50 μL, how much of the sucrose stock solution do you need to add to the assay? Enter the number only for units of μL. The number of significant digits you include in your answer doesn't matter.

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter1: The Nature Of Chemistry

Section: Chapter Questions

Problem 1.FCP: Some scientists think there are living things smaller than bacteria (New York Times, January 18,...

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Some scientists think there are living things smaller than bacteria (New York Times, January 18, 2000, p. D1). Called nanobes, they are roughly cylindrical and range from 20 to 150 nm long and about 10 nm in diameter. One approach to determining whether nanobes are living is to estimate how many atoms and molecules could make up a nanobe. If the number is too small, then there would not be enough DNA, protein, and other biological molecules to carry out life processes. To test this method, estimate an upper limit for the number of atoms that could be in a nanobe. (Use a small atom, such as hydrogen.) Also estimate how many protein molecules could fit inside a nanobe. Do your estimates rule out the possibility that a nanobe could be living? Explain why or why not.
O MEASUREMENT Adding or subtracting and multiplying or dividing measurements A chemistry student must write down in her lab notebook the concentration of a solution of sodium hydroxide. The concentration of a solution equals the mass of what's dissolved divided by the total volume of the solution. Here's how the student prepared the solution: • The label on the graduated cylinder says: empty weight: 1.5 g • She put some solid sodium hydroxide into the graduated cylinder and weighed it. With the sodium hydroxide added, the cylinder weighed 36.669 g. • She added water to the graduated cylinder and dissolved the sodium hydroxide completely. Then she read the total volume of the solution from the markings on the graduated cylinder. The total volume of the solution was 37.11 mL. What concentration should the student write down in her lab notebook? Be sure your answer has the correct number of significant digits. g mL Explanation -1 Check 99+ 0/5 VUDU © 2023 McGraw Hill LLC. All Rights…
Your 50 mL beaker has a mass of 6.65 g. You add 10.00 mL to the 50 mL beaker and now the total mass is 17.45 g. You originally used 5.14 g of NaCl to make the solution. What is the percent composition of your solution? These calculations are described in the lab procedure in detail.
This lab used 6 M HCl that was diluted from a higher concentration. If your lab instructor asked you to make a solution of HCl with a concentration of 2.0 M from 50.0 mL of a 10.0 M stock solution of HCl, to what total volume would you have to dilute the portion of stock solution? Units as mL.
How much water, in mL, needs to be added to 29.7 mL of 11.2 M HNO3 to make a 6.05 M solution with the same amount of moles of HNO3? Record 3 significant digits in your answer. Don't type units in. Round your answer to 3 significant figures.
A chemist prepares a solution of calcium bromide (CaBr,) by measuring out 84.7 g of calcium bromide into a 150. mL volumetric flask and filling the mark with water. Calculate the concentration in mol/L of the chemist's calcium bromide solution. Round your answer to 3 significant digits. | molL Continue
O MEASUREMENT AND MATTER W start Page Predicting the units of the solution to a basic quantitative... A student sets up the following equation to solve a problem in solution stoichiometry. (The ? stands for a number the student is going to calculate.) Enter the units of the student's answer. 1 mL 0.59 mL - 3 10 x10 108.39 mol II
One half tsp of table salt (NaCl) weighs aproximately 2.0 grams. (You will need to look up the molar mass for NaCl) There are approximately 237 ml in a cup. Determine the Molarity of the solution 1 cup water with one half tsp table salt. Determine the molarity of this solution using the formula M=g/MM/L. What is the molarity? Show your calculations. (Remember to convert 237 mL to L)
Part A: How many atoms of hydrogen does it contain? Express your answer using four significant figures. Part B: How many molecules of glucose does it contain? Express your answer using four significant figures. Part C: How many moles of glucose does it contain? Express your answer using four significant figures. Part D: What is the mass of this sample in grams? Express your answer using four significant figures.
How many milliliters of 1.50 M potassium hydroxide solution are needed to provide 0.125 moles of potassium hydroxide? Provide an answer correct to 2 significant figures. For example, if you calculate that the correct answer is 12.00 moles, simply type 12 in the box. Do not answer this question using scientific notation. Do not include units in your answer. (hint: this is like the previous problem. You're given two of the three variables in the molarity equation. You need to find the third.)
or dividing measurements A chemistry student must write down in her lab notebook the concentration of a solution of sodium hydroxide. The concentration of a solution equals the mass of what's dissolved divided by the total volume of the solution. Here's how the student prepared the solution: • The label on the graduated cylinder says: empty weight: 5.250 g • She put some solid sodium hydroxide into the graduated cylinder and weighed it. With the sodium hydroxide added, the cylinder weighed 75.41 g. • She added water to the graduated cylinder and dissolved the sodium hydroxide completely. Then she read the total volume of the solution from the markings on the graduated cylinder. The total volume of the solution was 37.4 mL. What concentration should the student write down in her lab notebook? Be sure your answer has the correct number of significant digits. -1 Explanation Check 2021 McGraw-Hill Education All Rights Reserved Terms of Use Privacy Accessibility Thank The # $ % & 2 3
A chemist prepares a solution of silver nitrate (AGNO,) by measuring out 77. g of silver nitrate into a 200. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mol/L of the chemist's silver nitrate solution. Be sure your answer has the correct number of significant digits. O molL