A solution with the pH of 13 is a Strong Base.
The unified cell theory states that: all living things are composed of one or more cells; the cell is the basic unit of life; and new cells arise from existing cells.
<span>HCl+NaOH---> NaCl+H2O
the 2 reactives are monovalent . the NaOH is 3 times as concentrated as HCl
So you need 3 volumes HCl 2M to neutralize 1 volume NaOH 6M
and for 75 ml NaOH 6M you need 75*3= 225mL HCl 2M
second question HBr+NH4OH--> NH4Br+H2O
as before 1 HBr for 1NH4OH is needed IF they have the same molarity
Here you need 40/10 =4 more HBr than NaOH
The molarity of NaOH is 4*0.5 =2M</span>
Answer:
C
Explanation:
A negative deltaH means that the reaction has to give up heat in order to happen. You have to treat deltaH as a reactant. So the question is do you need to add heat to the reactants to make the products. If you do, deltaH is plus.
Heat is required to make a solid go to a gas. deltaH is plus. A is not the answer.
A lot of heat is required for B (something like 400 Kj / mole. Like A, deltaH is plus and B is not the answer.
C: The liquid has to give up heat in order for the this reaction to take place. C is the answer.
D requires heat. It is not the answer.
Answer:
the series circuit has <u>one current</u> so if you don't disconnect the wires nothing happens
but if you disconnect the wires in series circuit, the current stop and the current doesn't go to the end
Explanation:
(≧▽≦)hope it helps (≧▽≦)