What are the three stages of matter and how?

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?

Charge is distributed along the entire x-axis with uniform density λ. how much work does the electric field of this charge distribution do on an electron that moves along the y-axis from y = a to y = b? (use the following as necessary: a, b, ε0, λ, and q for the charge on an electron.)

If a star is moving toward earth, it is