Starter Question
•Write the following numbers in scientific notation
0.00568g
256000000km
•Write the following number in ordinary notation
5.78x104g
4.23x10-2s
•Convert the following
752nm to cm
56.4kg to μg
Express the following quantities in scientific notation
300.8kg
3.008x102kg
0.0120325km
1.20325x10-2km
332080000cm
3.32080000x108cm
Convert the following as indicated.
155mg to g
0.155g
584µs to s
5.84x10-4s
24g to pg
2.4x1013pg
How many minutes are there in 5 days?
7200 minutes
A car is travelling at 118km/h. what is its speed in Mm/h
0.118Mm/h
Write the answers in scientific notation
0.005832g
5.832x10-3
0.0005800km
5.8x10-4
Significant Figures
The significant figures of a number are those digits that carry
meaning, contributing to its precision.
The exceptions are;
•Leading and trailing zeros
eg.
23000
0.00023
both these numbers have 2 sig. figs.
•Spurious digits introduced by calculations
•E.g. 23.45x0.35= 8.2075
Significant Figures
How many significant figures are in each of the following?
a) 12
b) 1098
c) 2001
d) 2.001x103
e) 0.0000101
f) 1.01x10-5
g) 1000
h) 22.04030
Graphs
There are 3 types of graph you need to know about
Pie Charts
This is used to show numerical
portion
Bar charts
This is often used to show
how a quantity varies with
factors; location or colour. It
is used for discontinous data
Line graph
This is used to show continuous
data such as how the
temperature of a system
changes over time
Now get into groups of two or three.
You will need to make sure that at least one person in each group
has a cell phone or device that can go on the internet.
If not use one of the classroom computers
Either a) go to the app store and download the socrative app
b) Type socrative.com/student into the address bar.
The room number is 190581
Exit ticket
Write the number of sig. figs. for each problem
a) 5.6857
b) 0.00586
c) 6786.000
d) 0.06050
e) 19900