Wks 3.1 - classifying matter (2 pages)
complete the blank labels in the diagram below.
can be separated
physically
e
definite composition s
(homogeneous)
mixture of
substances
variable composition
can be separated
chemically
(examples: water
sodium chloride)
(examples: carbon
hydrogen, oxygen)
uniform
also called a solution
nonuniform:
distinct phases
in alamiananeous mixture heteropencous mixture, compound, or an element.

Scientists are often interested in knowing the molar heat of combustion – the heat released during the combustion of one mole of a substance. use the periodic table to find molar masses. how many moles of ethanol are present in the sample?

Astudent made the lewis dot diagram of a compound as shown. mg is written with two dots shown on its top. an o is written on each side of mg. each o has six dots around it. an arrow is shown from one dot on mg toward the vacant space around the o on the right. another arrow is shown from the other dot on mg toward the vacant space around the o on the left. the title of the art is students lewis dot model. what is the error in the lewis dot diagram? an o atom should transfer all its six electrons to mg because the formula is mgo. both electrons of mg should be transferred to one o atom because the formula is mgo. the electrons should be transferred from each o atom to mg because mg has fewer electrons. the number of dots around mg should be four because it has to transfer two electrons to each o.

What are the trends and exceptions to the trends in electron affinity?