Answer:
0.100 M AlCl₃
Explanation:
The variation of boiling point by the addition of a nonvolatile solute is called ebullioscopy, and the temperature variation is calculated by:
ΔT = W.i
Where W = nsolute/msolvent, and i is the Van't Hoff factor. Because all the substances have the same molarity, n is equal for all of them.
i = final particles/initial particles
C₆H₁₂O₆ don't dissociate, so final particles = initial particles => i = 1;
AlCl₃ dissociates at Al⁺³ and 3Cl⁻, so has 4 final particles and 1 initial particle, i = 4/1 = 4;
NaCl dissociates at Na⁺ and Cl⁻ so has 2 final particles and 1 initial particle, i = 2/1 = 2;
MgCl₂ dissociates at Mg⁺² and 2Cl⁻, so has 3 final particles and 1 initial particle, i = 3/1 = 3.
So, the solution with AlCl₃ will have the highest ΔT, and because of that the highest boiling point.
Answer:
The correct answer is:
after the vein is entered (A.)
Explanation:
The procedure in the question describes venopuncture.
Venopuncture is the method of aseptically collecting blood into the right sample containers. Using a stopper-punturing needle and a vacuum tube, the following procedure is followed:
- assemble the needle and hub (needle holder)
- apply the tourniquet and examine the arm for palpable vein, palpate the vein
- release the tourniquet and swab the collection site with 70% alcohol
- allow the swab to dry
- reapply the tourniquet
- insert the stopper-puncturing needle (attached to hub) into the appropriate vein
- after the vein is entered, the stopper-puncturing needle should be completely pushed into the evacuated (vacuum) tubes
- blood will flow into the tube until vacuum is completely filled
- pull out the tube and invert gently several times if the tube contains anticoagulants
- place a gauze on the site of puncture (do not press down the gauze)
- remove the needle and press down the gauze immediately
- dispose the needle into the sharps container or appropriately
- label the tubes.
Just use q=mCDeltaT
q=energy
m=mass
c=specific heat
Delta T= Change in temperature
The name of the compound Na2SO4 is:
nitrogen sulfite
nitrogen sulfide
sodium sulfate
sodium sulfite
nickel sulfide
sodium sulfate
The formula of calcium phosphate is:
CaPO4
CaP
Ca3(PO4)2
Ca4(PO4)3
Ca(PO4)2
Ca3(PO4)2
The formula for calcium acetate is:
Ca2C2H3O2
CaC2O4
Ca(C2O4)2
Ca(C2H3O2)2
CaC2H3O2
Ca(C2H3O2)2
