Week 1 Lab - Introduction to Science Question Set

Can you please answer these and give me an explanation.

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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…

what is the mass of baker? What is the mass of sodium acetate?

Suppose your instructor places a can of regular and diet cola in a large container filled with water. What might you expect happen based on the results of this experiment?

Need all three plz

Jacquel Adding or subtracting and multiplying or dividing measurements A chemistry student must write down in her lab notebook the concentration of a solution of potassium chloride. 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: 4.200 g • She put some solid potassium chloride into the graduated cylinder and weighed it. With the potassium chloride added, the cylinder weighed 71.0 g. • She added water to the graduated cylinder and dissolved the potassium chloride completely. Then she read the total volume of the solution from the markings on the graduated cylinder. The total volume of the solution was 133.0 mL. What concentration should the student write down in her lab notebook? Be sure your answer has the correct number of significant digits. Ch 8 mL Explanation Check O2021 McGraw-Hill Education All Rights Reserved…

A 1185 mL sample of drinking water was found to contain 20.5 mg of lead. Calculate the concentration of lead in milligrams per liter. concentration: mg/L MacBook Air トト F11 F12 888 FB F7 F3 F4 24 & * 4 5 6 7 8 Y K

Name the following Fe(NO3)2

A teacher tells students to describe physical properties of 10 mL of vinegar and 10 mL of milk. When the students finish listing the physical properties in their science notebooks, the teacher pours the vinegar and milk into the same beaker. The students are surprised to see a white solid substance form within the beaker as the two substances are combined. 13 What occurs within the beaker as the teacher mixes the vinegar and milk? A A chemical change that produces a precipitate B A physical change that creates a new substance C A physical combination that produces a solid D A corrosive reaction between two liquids 14 Before going to school, a student cuts a ripe apple into six slices and places them in a plastic bag. During lunch, the student observes that the apple slices now have brown spots. Which of the following indicates a chemical change in the apple? F Cutting the apple into six slices G Changing color of the apple H Placing the slices in a plastic bag J Removing brown spots…

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

1. Several students performed this experiment without paying adequate attention to the details of the procedure. Briefly explain what effect each of the following procedural hanges would have on the size of the volume- to- temperature ratio calculated by the students. (a) One student failed to replenish the boiling water in the boiling- water bath as the flask was being heated. At the end of the 6 min of heating, the boiling water in the bath was only in contact with the lower portion of the flask. (b) Following the proper heating of the flask in the boiling water, a student removed the flask from the boiling- water bath but only partially immersed the flask in the ice-water bath during the cooling period. (c) A student neglected to close the pinch clamp before removing the flask from the boiling water bath and immersing it in the ice-water bath. (d) One student neglected to measure the volume of the flask before leaving the laboratory. Because the procedure called for a 125-mL…

You are given a dye stock solution which contains  0.200 g/L dye.  If you place 20.0 mL of stock in a 50.0 mL volumetric flask and add distilled water to the line, what is the concnetration of the new solution in the flask? a. 0.080 g/L b. 0.800 g/L c. 0.500 g/L d. 0.00020 g/L

Your lab group needs to make 25.0 mL of a 2.5 M Cu(NO3)2 solution, which piece of glassware should be used to accurately measure the 25.0 mL solution? 25.0 mL Volumetric Flask 25.0 mL Beaker 25.0 mL Erlenmeyer Flask 25.0 mL Graduated Cylinder

None

The solvent moves 3 cm in about 10 minutes. Why shouldn't the experiment be stopped at that time instead of waiting 75 minutes for the solvent to move 10 cm? Question 3 options:   More time increases the concentration of mixture components.   More time allows for better separation of components in a mixture.   More time decreases the concentration of mixture components.   Instructors don't like students to be finishing their labs too quickly.