SI System
What does the SI System stand for?
The International System of Units
What is the abbreviation for the prefix centi? What does this mean in scientific notation?
c
1 X 10-2
What is scientific notation?
A way to write really big or really small numbers using the base-10 system.
Ex: 1 X 103
What is dimensional analysis?
Converting units using conversion factors.
What is accuracy?
How correct a value is.
True or False:
The SI system is only used by 3 countries.
False. It is used my most countries
What is the abbreviation for the prefix micro? What does this mean in scientific notation?
µ
1 X 10-6
What is 20m written in scientific notation?
2 X 101 m
What is a conversion factor?
A unit equality as a ratio
What is precision?
The consistency of the values.
What is the SI unit for mass and its abbreviation?
Kilograms (kg)
What is the name and abbreviation of the prefix that means 1 X 10-3?
Milli (m)
What is 6.3 X 10-9 mL written in expanded form?
0.0000000063 mL
How many Megaliters are in 9.8 X 10-4 liters? Use dimensional analysis, write your answer in scientific notation, provide your unit, and write it out on the white board as a group.
9.8 X 10-4 L (1 X 100 ML/ 1 X 106 L) = 9.8 X 10-10 ML
3 trials were done to determine the density of a pear. The correct density is 4.4g/mL.
Trial 1- 4.3g/mL
Trial 2- 4.4g/mL
Trial 3- 4.5g/mL
Was this accurate? Was this precise? Why?
Both accurate and precise because the values are consistent and true.
What is the SI unit for the amount of a substance and its abbreviation?
Mole (mol)
What is the name and abbreviation of the prefix that means 1 X 106?
Mega (M)
What is 50,430,000,000,000,000 ms written in scientific notation?
5.043 X 1016 ms
How many milligrams is 4,300 grams? Use dimensional analysis, write your answer in scientific notation, provide your unit, and write it out on the white board as a group.
4.3 X 103g (1 X 103 mg/1 X 100 g) = 4.3 X 106 mg
3 trials were done to determine the mass of a paperclip. The correct mass is 1.0g.
Trial 1- 2.0g
Trial 2- 2.1g
Trial 3- 2.2g
Was this accurate? Was this precise? Why?
It is precise because the values are consistent. It is not accurate because the correct mass was off by 1g.
What is a derived unit? Provide 2 examples and what they are used for.
A product, power, or quotient of base units.
Area- m2
Volume- m3
Density- kg/m3
Energy- J (N•m)
If something is 1 X 10-12 of a base unit, what prefix would you use in front of the unit? What is its abbreviation?
Pico (p)
If I have 4,300,000 g of a substance, what is this in scientific notation? What units could I use instead that would make way more sense and how many of this unit would I have?
4.3 X 106 g
Megagrams, 4.3 Mg
A rock's density was found to be 20 g/mL. What is its density in mg/ML? Use dimensional analysis, write your answer in scientific notation, provide your unit, and write it out on the white board as a group.
2.0 X 101 g/mL (1 X 100mg / 1 X 10-3g)(1 X 100mL / 1 X 10-3L)(1 X 106L / 1 X 100ML)= 2 X 1013 mg/ML
3 trials were done to determine the volume of a plum. The correct volume is 25.4 mL.
Trial 1- 18.3 mL
Trial 2- 32.1 mL
Trial 3- 25.8 mL
Was this accurate? Was this precise? Why? Would you use these numbers in a scientific study about plum volumes? How would you proceed from here?
It is not precise because there is high variation in the values. However, it is accurate because the average of the numbers did come out to be 25.4 mL. I would not use these number in a study because they are not precise. I would do more trials and figure out where my problem with precision is to make my study both accurate and precise.