Starter Question

•Write the following numbers in scientific notation0.00568g256000000km

•Convert the following752nm to cm56.4kg to μg

•Write the following number in ordinary notation5.78x104g4.23x10-2s

Express the following quantities in scientific notation

300.8kg

0.0120325km

332080000cm

3.008x102kg

1.20325x10-2km

3.32080000x108cm

Convert the following as indicated.

155mg to g

584µs to s

24g to pg

0.155g

5.84x10-4s

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

0.0005800km

5.832x10-3

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. 230000.00023 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) 12b) 1098c) 2001d) 2.001x103

e) 0.0000101f) 1.01x10-5

g) 1000h) 22.04030

Graphs

There are 3 types of graph you need to know about

Pie Charts

This is used to show numerical portion

Bar chartsThis 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 computersEither a) go to the app store and download the socrative appb) 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