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Scientific Measurements Lab

Scientific Measurements basics

Course

Introductory College Chemistry (CH 209)

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Regis University

Academic year: 2022/2023

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Scientific Measurements Lab Activity Unit 1

Name:_____________________________ Date:________________

Directions: Work with a partner to complete the activities at each of the 6 stations. Record all your data including appropriate units on this worksheet. For each measurement record the value at the line plus an estimate of the value between the lines. For example if the unit between the lines is 1 cm, then divide by two and the measurement between the lines is 0 cm. If the measurement is closest to the line, then an additional 0 must be recorded.

For Example:

The unit of measure for length using this ruler is cm. The value to the nearest line is 3 cm. The estimated value between the lines is 0 cm. So the measured length of this leaf is 3 cm, where 3 cm is certain, and the 0 cm is an estimate.

If the point of the leaf was closer to the 3 or exactly on the 3, the recorded measurement would be 3.

Station 1: Measuring Volume using 3 Different Graduated Cylinders The instructor will discuss how to read the meniscus on a graduated cylinder. Read and record the volume of the water in each different cylinder. Make sure to estimate to the appropriate precision. Volume of water measured with a 100 mL graduated cylinder: ____________________ Each line in a 100 mL graduate represents ____ mL, so between the lines is____ Volume of water measure with a 25 mL graduated cylinder: ______________________ Each line in a 25 mL graduate represents ____ mL, so between the lines is ____ Volume of water measured with a 10 mL graduated cylinder: _____________________ Each line in a 10 mL graduate represents ____mL, so between the lines is _____

Box the digits that are certain. Circle the digits that are estimated.

Scientific Measurements Lab Activity Unit 1

Station 2: Measuring Length Measure the length of a wooden block with both Ruler A and Ruler B. Make sure to estimate to the appropriate precision. Unit of measure for length with this tool:_________________ Ruler A: ____________________ Each line represents ______, so between the lines is ______ Ruler B: ____________________ Each line represents _____, so between the lines is ______ Box the digits that are certain. Circle the digits that are estimated

Station 3: Massing a Solid Record the mass of a copper cylinder on both balances. Make sure to estimate to the appropriate precision. Unit of measure for mass using these instruments: _______________ Mass of cylinder on centigram electronic balance A: _____________________ Mass of cylinder on the milligram electronic balance B: ____________________ Box the digits that are certain. Circle the digits that are estimated Are the two measurements different? Why?

Station 3: Measuring Mass by Difference Using the electronic balance, obtain the mass of a paper cup and record the value with units below. Then, add t he sample of sugar to the cup. Record the combined mass of both the cup and the sugar. When finished, put the sugar sample back in the original cup. Use your two measurements to determine the mass of sugar only. Mass of paper cup:_________________ Mass of paper cup with sugar:_______________ Calculated mass of sugar: ____________________ Box the digits that are certain. Circle the digits that are estimated.

Scientific Measurements Lab Activity Unit 1

Unit of measure: ___________

Volume in the graduated cylinder without the block:_________________ Volume in the graduated cylinder with the block: ___________________ Volume of the block: ____________________________

Compare the volume measured from method 1 to method 2. Are the two measurements the same or different? Are the units the same or different? Explain.

Density: Calculate the density of the block. Include the appropriate units. Density = Mass/volume (hint a single value can have more than 1 unit of measure, e. miles per hour = mi/hr) Density using calculated volume:

Include problem set up and units _________________ Density using volume from displacement:

Include problem set up and units __________________

For future reference 1 cm 3 = 1 mL

ML

30 mL

33

3

Scientific Measurements Lab Activity Unit 1

Station 4: Measuring Temperature Set up a ring stand with a ring and a wire mesh. Place the beaker of water on the wire mesh. Set up a Bunsen burner under the beaker and light. Measure and record the temperature of the water in the beaker (unit of measure is ºC) using two different instruments for a period of 6 minutes. (1) the Lab Quest with the Vernier temperature probe with the lab quest and (2) a thermometer. Make sure to estimate to the appropriate precision. Instrument initial 2 min 4 min 6 min Vernier temperature probe and LabQuest Thermometer

Box the digits you are certain of. Circle the digits that are estimated Are the two measurements different? Why?

Graph the data you measured. Temperature vs Time

Temperature (C)

Time (minutes)

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Scientific Measurements Lab

Course: Introductory College Chemistry (CH 209)

7 Documents

Students shared 7 documents in this course

University: Regis University

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Regis Jesuit Chemistry AMDG

Scientific Measurements Lab Activity

Unit 1

Page 1 of 5

Name:_____________________________ Date:________________

Directions: Work with a partner to complete the activities at each of the 6 stations.

Record all your data including appropriate units on this worksheet. For each

measurement record the value at the line plus an estimate of the value between the

lines. For example if the unit between the lines is 1 cm, then divide by two and the

measurement between the lines is 0.5 cm. If the measurement is closest to the line,

then an additional 0 must be recorded.

For Example:

The unit of measure for length using this ruler is cm. The value to the nearest line is 3

cm. The estimated value between the lines is 0.5 cm. So the measured length of this

leaf is 3.5 cm, where 3 cm is certain, and the 0.5 cm is an estimate.

If the point of the leaf was closer to the 3 or exactly on the 3, the recorded measurement

would be 3.0.

Station 1: Measuring Volume using 3 Different Graduated Cylinders

The instructor will discuss how to read the meniscus on a graduated cylinder. Read and

record the volume of the water in each different cylinder. Make sure to estimate to the

appropriate precision.

Volume of water measured with a 100 mL graduated cylinder: ____________________

Each line in a 100 mL graduate represents ____ mL, so between the lines is____

Volume of water measure with a 25 mL graduated cylinder: ______________________

Each line in a 25 mL graduate represents ____ mL, so between the lines is ____

Volume of water measured with a 10 mL graduated cylinder: _____________________

Each line in a 10 mL graduate represents ____mL, so between the lines is _____

Box the digits that are certain. Circle the digits that are estimated.

Scientific Measurements Lab

Introductory College Chemistry (CH 209)

Regis University

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Preview text

ML

30 mL

33

3

Scientific Measurements Lab

Course: Introductory College Chemistry (CH 209)

University: Regis University

Students also viewed

Related documents