Why would you not be able to hear a sound in space?

Assume this car is driven off a cliff . how many arrows of force need to be drawn in the free body diagram? assume no air resistance -five -one -three -four

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.

You can estimate the degree to which a bond between two atoms is ionic or covalent by calculating the