# Significant Figures

A) Provide the type of measurement (volume, length, temperature etc.) for the following units:

i) 298 K

ii) 65 mL

iii) 15 m

iv) 290 kg

v) 50 g

b) Write the following measurements in scientific notation:

i) 150000000 kg

ii) 0.28 L

iii) 0.00004 m

c) Answer whether the numbers in each of the following statements is measured or exact:

i) The Cambrian explosion occurred 545000000 years ago.

ii) 26 students went for the field trip.

iii) The number of microbes on a telephone is 25600.

d) State how many significant figures there are in each of the following measured quantities:

i) 18.000 m

ii) 52.80 L

iii) 7.0 X 10-14 kg

e) Round off each of the following numbers to two significant figures:

i) 66.666

ii) 0.0063424

iii) 9577

https://brainmass.com/chemistry/general-chemistry/significant-figures-111306

#### Solution Preview

Please see attached file.

Solution is below, and as HTML attached - provided a couple of links that are live in the HTML page version.

As for "help", I am going to point you to the resources you need to answer these yourself, and put in an example or two - but NOT to do them for you, OK? So let's go then!

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a) Provide the type of measurement (volume, length, temperature etc.) for the following units:

i) 298 K

ii) 65 mL

iii) 15 m

iv) 290 kg

v) 50 g

go to the following site and look at the entries for metric and SI units, should be easy enough

http://www.ex.ac.uk/cimt/dictunit/dictunit.htm#SI

b) Write the following measurements in scientific notation:

i) ...

#### Solution Summary

Answer goes down a sort list of problems and deals with issues such as significant figures, rounding, and math as related to science in general.