What is the correct formula for calcium nitride

Which metal is too expensive to be used as a drink can?

The ray of light which travels towods a mirrors

When heat energy is removed, two changes are observed: Change A: Gas changes phases to a liquid. Change B: Liquid changes phases to a solid. What are the names for phase changes A and B? A is condensation and B is freezing.

The lithosphere is divided into pieces called

A 5.10 g sample of iron is heated from 36.0 to 75.0 C. The amount of energy required is 89.5 J. The specific capacity of this sample of iron is ... A.) 17800 J/g C B.) 0.900 J/g C C.) 11.7 J/g C D.) 0.450 J/g C E.) 2.22 J/g C

Which is a pure substance A) mixture B) solution C) element

Samuel adds a teaspoon of salt to a glass of water. He notices that the song disappears. Samuel takes a sip to discover that the water taste salty. What kind of change has occurred?

How are the physical and chemical properties of atoms represented on the periodic table of elements

how do we know isotopes exist?

Is albinism a dominant or recessive trait