Do Now

1) Calculate the density of an unknown substance that weighs 2.5 grams and takes up 3.5 mL.

2) What volume of gold weighs 0.2 kg when the density of gold is 19.30 g/mL.

Objective

I CAN differentiate between a solid, liquid, and gas by describe the differences between the particle spacing and intermolecular forces.

Solids, liquids, gases

Significant Figures

• 3.040• 0.0045• 4500• 4.5003• 4500.• 10.000• 00.003030

Significant Figures math

• (3.3 x 1023 cm) x (0.005 cm) = ??

• 127.45 g + 155.55 g = ??

• 90.00 m x 3.000 m = ??

Conversions

• 450 km = ?? Nm

• 5 Gm = ?? Pm

• 20 cm = ?? km