How many kJ are required to heat 45.0 g of H20 at 25.0 degrees celsius and then boil it all away? (specific heat of liquid water is 4.18 J/g degrees celsius)

Alarge marble is dropped in a graduated cylinder with 35ml of water in it. the water level increases to 49ml. what is the volume of the marble

Consider a culture medium on which only gram-positive organisms such as staphylococcus aureus colonies can grow due to an elevated nacl level. a yellow halo surrounds the growth, indicating the bacterium fermented a sugar in the medium, decreasing the ph as a result and changing the color of a ph indicator chemical. this type of medium would be referred to as a differential and enrichment culture.

What is the difference between skimming and absorbing methods of the oil removal