This document contains instructions for scientific work activities from a Physics and Chemistry textbook. Students are asked to define units, complete tables converting between units, write numbers in scientific notation, perform calculations, find the area and volume of objects by measuring and using SI units, and look up unit conversions between other systems and the SI. Exercises are assigned from specific pages to complete for homework.

1. Physics and Chemistry 3rd ESO Albarregas High School
Scientific Work
Activities
1. Look for the definition of: meter, second and kilogram.
2. Complete the table:
Luminous
Quantity Length Temperature
intensity
Unit meter kilogram mol
Symbol m s A
3. Change the units and fill in the table. Use scientific notation if it is necesary
0,2 hours minutes seconds
hours 12 minutes seconds
hours minutes 5·106 seconds
m 0,026 cm mm
m cm 4·10-3 mm
10 m2
-4
cm2 mm2
m2 cm2 7 mm2
g cg 5 mg
5g cg mg
kg g 0,000 022 mg
6 ns s
8 Gm m
4,4 g kg
0,6 MW W(watt)
200 g/L kg/m3
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2. Physics and Chemistry 3rd ESO Albarregas High School
4. Write the following numbers in scientific notation. How many sig figs do they have?
Quantity Sig. figures
0,000 234 2,34·10-4 3
2 460 000
102,01
0,2004
5532
4 500 000 000
1554,02
0,000 000 033 00
5. Make the calculations and round whith the right number of decimal places:
a) 4.60 + 3 = b) 0.008 + 0.05 = c) 22.4420 + 56.981 =
d) 200 - 87.3 = e) 67.5 - 0.009 = f) 71.86 - 13.1 =
g) 13.7 x 2.5 = h) 200 x 3.58 = i) 0.00003 x 727 =
j) 5003 / 3.781 = k) 89 / 9.0 = l) 5000. / 55 =
6. Find the area of your desk. Explain how yo do it and what you need measure. Express the
result using units of the SI with the right number of decimal places.
Measures: Units
RESULT S.I.
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3. Physics and Chemistry 3rd ESO Albarregas High School
7. Find the volume of your bedroom (be carefully with the significant figures). Explain how yo
do it and what you need measure.
Measures units
RESULT S.I.
8. British people use very often units that aren't in the SI. Find out their equivalence with the
units of the SI
Unit Magnitude Equivalence with SI units
mile
yard
foot
ounce
pound
pint
Fluid ounce
gallon
9. In Spain, there are ancient units used before the SI exits. Some of them are still used in
specific ocasions. Find out their equivalence in the SI.
Unit Magnitude Equivalence with SI units
vara
arroba
onza
cuartillo
libra
Activities from your Physics and Chemistry book:
– Page 13: Exercices 8 and 9.
– Page 18: Exercise 13.
– Page 19: Exercise 23.
– Page 20: Exercise 27 and 30.
– Page 21: Exercise 36.
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