Answer:
B) Because you are adding positively charged protons, which pull in the outer electrons.
Explanation:
Since the increase in protons have a greater effect then the increase in electrons the protons pull the electrons in closer resulting the radius of an atom to decrease from left to right across a period.
Answer: a) 
is the limiting reagent
b) 0.27 g of 
will be produced.
Explanation:
To calculate the moles :
According to stoichiometry :
3 moles of require = 2 moles of 
Thus 0.003 moles of will require=
of
Thus is the limiting reagent as it limits the formation of product and is the excess reagent.
b) As 3 moles of give = 2 moles of
Thus 0.003 moles of give = of
Mass of 
Thus 0.27 g of will be produced.
Answer: No
Explanation: The reason for this is because calcite has a hardness of 9 while feldspar has a hardness of 21. Calcite can scratch Gypsum which has a hardness of 3.
Answer:
Explanation:
When there is difference between the concentration of the content of a cell and the solution surrounding the cell, there will be an Electrochemical gradient or Concentration gradient. Therefore, some solute will tend to move from the region of high concentration to the region of lower concentration through the cell membrane.
Such a movement is called Primary Active Transport
Answer:
The pH o.s the s.u.b.st.a.n.c.e is 1,92.
Explanation:
pH = -log (H +)= -l.o.g (1.2 x 10^-2 )=1,92
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