Phosphoric acid can be used to clean scale (calcium carbonate) from water fixtures like taps by reacting with it to form products that dissolve easily.

Cooling the phosphoric acid solution would

A. remove less scale.

B. remove more scale.

C. remove scale less quickly.

D. remove scale more quickly.

The rules of engagement (roe) working group is often used to (select all that apply.)

Why does the sun appear to be the brightest star in the sky? a- its apparent brightness is much greater than other stars. b- it burns more gas, making it brighter than any other star. c- it is the largest star in the galaxy, so it is the brightest star. d- its relative distance to earth is closer than the other stars.

What does the symbol (–hfus) indicate in a phase change?