Answer:
In chemistry, valence electrons are the electrons that are located in the outermost electron shell of an element.
Explanation:
Answer:
Distillation
Explanation:
A solution of water and ethanol are miscible. Hence, they can only be separated by a process known as distillation. Distillation is the process in which two or more constituents in a mixture are separated based on there difference in boiling points. <u>The mixture is subjected to high heat and the one with the least boiling point distills/evaporates out first followed by the next least boiling point</u>.
<u>From the explanation above, it can be deduced that ethanol (with boiling point of 78°) will be distilled out while water remains in the boiling tube or container</u>.
Answer: 
molecules are there in the flask
Explanation:
According to the ideal gas equation:
P = Pressure of the gas = 1 atm
V= Volume of the gas = 2.00 L
T= Temperature of the gas = 273 K 
R= Gas constant = 0.0821 atmL/K mol
n= moles of gas
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number 
of particles.
1 mole of gaseous air contains = molecules
11.2 moles of gaseous air contains = 
molecules
gaseous molecules are contained in the flask.
Answer:
375
Explanation:
Divide 250 by 500 which would give you .5. Then multiply .5 to 750 which would give you 375
