Density. Chapter I review
Answers are for parents and teachers.
1
What is the mass in kg of a steel object of volume 2 m³ (ρ = 7800 kg/m³)?
15600
2
What is the volume in litres of 36 kg of ice (ρ = 900 kg/m³)?
40
3
A body has mass 135 g and volume 50 cm³. Calculate its density and find the substance in the table.
2.7 g/cm³ — aluminium.
4
The density of lead is 11.3 g/cm³. Express it in kg/m³.
11300
5
Choose the 5 most important concepts of Chapter I and write one sentence for each.
Sample: molecule — the smallest particle keeping a substance’s properties; diffusion — mixing of substances; mass — a measure of inertia; density — mass divided by volume; Brownian motion — random motion of small particles.