What are your dreams and goals?

Awhite powder is added to a solution. the images show observations made before the powder is added, just after the powder has been added, and a little while later. (the liquid in the small beaker is phenol red solution.) what evidence shows that a chemical change has taken place?

Sari is studying for different sample of materials. this table shows the mass and volume of the samples. which sample material(s) could be liquid

Which statement is true about this reaction? 14n+h–> 150 it is a practical source of energy on earth. it occurs only outside the solar system. its product is heavier than each of its reactants. it shows the critical mass of an element.