Sir William Ramsey is one scientist credited with identifying the noble gas argon. Sir Ramsey separated nitrogen gas from the air and reacted it with an excess of magnesium, producing solid magnesium nitride. However, a small sample of an unreactive gas remained with a density different from the density of the nitrogen
gas. Sir Ramsey identified the unreactive gas as argon and later went on to discover neon, krypton, and xenon.
Compare the chemical reactivities of nitrogen gas and argon gas based on Sir Ramsey's experiment using magnesium

the answer to your question is c.

if you read the house of usher you should know that the house was haunted

a  solution  is always transparent, light passes through with no scattering from solute particles which are molecule in size. the  solution  is homogeneous and does not settle out. a colloid is intermediate between asolution  and a  suspension. while asuspension  will separate out a colloid will not.

just did the assignment and the answer was #1 +2 n

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

i think? ?