Plz im in test
several properties of the element magnesium are shown. which one is a chemical property?
a.
has a density of 1.7 g/cm3
b.
melts at 650°c
c.
conducts electricity
d.
has a silvery-white color
e.
burns when exposed to heat

3. how much energy in joules is required to evaporate .0005 kg of liquid ammonia to vapor at the same temperature? 4. how much energy ( in megajoules ) is given up by .75 kg of water at 0c when it freezes to form ice at 0c? 5. explain how heat works between and at critical temperatures?

Is a pencil falling to the floor anon contact force, a force, or a contact force

What are some natural measures of time