advertisement

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