What can be observed about a substance that does not change the identity of that substance

A branch of chemistry that deals with the determination of the composition of any substance is: analytical chemistry applied chemistry biochemistry physical chemistry

Which is the separation technique that identifies parts of a mixture based on how fast different compounds move across a material? a. filtration c. chromatography b. distillation d. crystallization

Which two of these are chemical reactions? Tick two boxes. You dissolve a spoonful of sugar in water. Bread goes brown in the toaster. You take an ice lolly out of the freezer and it strats to melt. Frost forms on the grass an a cold night.

Once a spontaneous process or reaction begins, it will continue to proceed on its own. This will result in a lower energy state and the process occurs naturally. A. An example of a spontaneous process is an ice cube melting.

How many atoms of magnesium are in 1.00 gram?

Based on the measured pH values, identify the liquid tested that is 10 times more acidic than vinegar.

In protein synthesis, how many nitrogenous bases code for a single amino acid?

You may normally expect a slow reaction rate if a large A. E. is required True or False?

Give the quantum values of n, l, m and s for nitrogen

Argon, krypton, and xenon are a. noble gases. b. lanthanides. c. alkaline earth metals. d. actinides.