What are the variables that don't change

Take a look at group 7A on the periodic table (Halogens). Which of the following statements is true regarding fluorine and iodine?

A pure chemical substance that consist of one atom with specific chemical properties is called

Explain the 'redox' process in your own words.

A 0.300 m solution of hcl is prepared by adding some 1.50 m hcl to a 500 ml volumetric flask and diluting to the mark with deionized water. what volume of 1.50 m hcl must be added?

What would the molecular formula be if magnesium and nitrogen reacted to form a neutral compound?

Particles of matter how have both potential and kinetic energy is that true or false?

Visible light waves are part of the blank Spectrum

Why does a soccer ball stop rolling in a soccer game which newton law shows that?

What is the name of the compound PbS2 • 4H2O?

Why doesn't gravity pull water all the way to the center of the Earth?