Question

learning objective
students will use lab results to calculate percent error.
students can express lab results in si units using conversions skills.
students are able to match the lab tools to the types of measurements.
warm up
explain why it is important to know how to use lab tools.
explain why it is important to put answers in si units (international systems of unit)
what is scientific measurement?
video on si unit of measurement
the si (système international dunités) unit system is used because it provides a universal, consistent, and standardized language for measurement that facilitates global scientific, industrial, and commercial collaboration and communication. it simplifies calculations and conversions through its decimal - based structure, reduces errors by ensuring a single, coherent system of units, and promotes precision and reliability by defining units with fixed physical constants. using the right measurement tool in a science lab is crucial for ensuring the accuracy, precision, and reproducibility of experimental results, which are fundamental for drawing valid conclusions and making reliable scientific discoveries. the appropriate tool minimizes errors, accounts for the scale of the measurement needed, and ensures data is consistent and comparable across different experiments and labs.
what are the si unit used to measure the following?
what are the different types of measurement units we use in our biology lab?
we do:

• using a __________ to measure 10000 grams of sugar = __________ dag of sugar
• using a __________ to measure 150 l = __________ ml
• using a __________ to measure 1.9 meters is converted to __________ mm.
• using a __________ to measure the amount of time of 201 seconds to __________ minutes.

you do: convert the following to the base unit, show your work!
mass of 10 kilograms = ____________ grams

Explanation:

Step1: Recall SI - unit conversion factors

1 kg = 1000 g, 1 daG = 10 g, 1 L = 1000 mL, 1 m= 1000 mm, 1 minute = 60 seconds.

Step2: Convert 10000 grams of sugar to daG

Since 1 daG = 10 g, then the number of daG in 10000 g is $\frac{10000}{10}=1000$ daG. We use a balance to measure mass.

Step3: Convert 150 L to mL

Since 1 L = 1000 mL, then 150 L = 150×1000 = 150000 mL. We use a graduated - cylinder or a volumetric flask to measure volume.

Step4: Convert 1.9 meters to mm

Since 1 m = 1000 mm, then 1.9 m=1.9×1000 = 1900 mm. We use a ruler or a tape - measure to measure length.

Step5: Convert 201 seconds to minutes

Since 1 minute = 60 seconds, then the number of minutes in 201 seconds is $\frac{201}{60}=3.35$ minutes. We use a stop - watch to measure time.

Step6: Convert 10 kilograms to grams

Since 1 kg = 1000 g, then 10 kg = 10×1000 = 10000 g.

Answer:

• Using a balance to measure 10000 grams of sugar = 1000 daG of sugar
• Using a graduated - cylinder/volumetric flask to measure 150 L = 150000 mL
• Using a ruler/tape - measure to measure 1.9 meters is converted to 1900 mm
• Using a stop - watch to measure the amount of time of 201 seconds to 3.35 minutes
• Mass of 10 kilograms = 10000 grams