Answer:
I feel that "The Mesosaurus could not swim between the continents in the open ocean, so the fossils
show that the continents must have been together in the past." Is the best answer.
Explanation:
Because this is a true statement and even scientists belive this is true.
Hello!:
Molar mass:
HBr = 80.91 g/mol
HNO3 = 63.01 g/mol
Number of moles:
moles HBr = 1.0 / 80.91 => 0.01235 moles of HBr
moles HNO3 = 1.0 / 63.01 => 0.01587 moles of HNO3
So , total moles of H⁺ :
0.01235 + 0.01587 => 0.02822 moles of H⁺
Molarity of solution:
M = n / V
M = 0.02822 / 5.0
M = 0.005644
Therefore:
pH = - log [ H⁺ ]
pH = - log [ 0.005644 ]
pH = 2.25
Hope that helps!
<span>If a solid forms when two ionic solutions are mixed together in a test tube, it is an indication of a chemical change
The precipitaion os the solid indicates that a new product has been formed which is not soluble.
When a solid ionic compound is put in water, the compound is dissolved by ionizing (the ions separate and remain in aqueous phase). If you combine two ionic solutions and see a solid precipiate is becasue the ions have combined and form a new compound which is not soluble.
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Volume of 3M solution: x
Moles in 3M solution: 3x
C = n/V
1,8 = 3x/0,05dm³
0,09 = 3x
x = 0,03dm³
A student need 0,03dm³ 3M HCl and 0,02dm³ of water.
The answer is A.
The 3 rules of Cell Theory is:
1) Cells are the basic unit of life
2) Cells come from preexisting cells
3) All living things are made up from cells
