Unit 7: Matter and its properties

In this first video we have a good summary of the general properties of mass and volume and the specific property of density, which is derived from them.

 

Don’t worry too much about the numbers and the fractions, its easy to understand by the images alone. The formula is the one we learnd in class:

Density = Mass / Volume

In this second video you can revise what we learned about which objects sink or float. Objects with a density higher than water’s (1g/cm3) sink, and those with lower density float.

de teachermarcosha Publicado en Science

Unit 4 Vertebrates – Amphibians

Today we’re going to look at a truly amazing group of vertebrates.

When they’re born they usually live in water… but when they grow up and become adults they spend most of their time on land. We present – the Amphibians!

de pieroenzo Publicado en Science